mirror of
https://github.com/git/git.git
synced 2024-11-18 06:03:53 +01:00
1874 lines
47 KiB
C
1874 lines
47 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "attr.h"
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#include "object.h"
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#include "blob.h"
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#include "commit.h"
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#include "tag.h"
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#include "tree.h"
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#include "delta.h"
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#include "pack.h"
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#include "csum-file.h"
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#include "tree-walk.h"
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#include "diff.h"
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#include "revision.h"
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#include "list-objects.h"
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#include "progress.h"
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static const char pack_usage[] = "\
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git-pack-objects [{ -q | --progress | --all-progress }] \n\
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[--max-pack-size=N] [--local] [--incremental] \n\
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[--window=N] [--window-memory=N] [--depth=N] \n\
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[--no-reuse-delta] [--no-reuse-object] [--delta-base-offset] \n\
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[--non-empty] [--revs [--unpacked | --all]*] [--reflog] \n\
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[--stdout | base-name] [<ref-list | <object-list]";
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struct object_entry {
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struct pack_idx_entry idx;
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unsigned long size; /* uncompressed size */
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struct packed_git *in_pack; /* already in pack */
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off_t in_pack_offset;
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struct object_entry *delta; /* delta base object */
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struct object_entry *delta_child; /* deltified objects who bases me */
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struct object_entry *delta_sibling; /* other deltified objects who
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* uses the same base as me
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*/
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void *delta_data; /* cached delta (uncompressed) */
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unsigned long delta_size; /* delta data size (uncompressed) */
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unsigned int hash; /* name hint hash */
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enum object_type type;
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enum object_type in_pack_type; /* could be delta */
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unsigned char in_pack_header_size;
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unsigned char preferred_base; /* we do not pack this, but is available
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* to be used as the base object to delta
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* objects against.
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*/
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unsigned char no_try_delta;
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};
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/*
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* Objects we are going to pack are collected in objects array (dynamically
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* expanded). nr_objects & nr_alloc controls this array. They are stored
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* in the order we see -- typically rev-list --objects order that gives us
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* nice "minimum seek" order.
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*/
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static struct object_entry *objects;
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static struct object_entry **written_list;
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static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
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static int non_empty;
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static int no_reuse_delta, no_reuse_object;
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static int local;
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static int incremental;
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static int allow_ofs_delta;
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static const char *pack_tmp_name, *idx_tmp_name;
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static char tmpname[PATH_MAX];
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static const char *base_name;
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static int progress = 1;
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static int window = 10;
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static uint32_t pack_size_limit;
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static int depth = 50;
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static int pack_to_stdout;
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static int num_preferred_base;
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static struct progress progress_state;
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static int pack_compression_level = Z_DEFAULT_COMPRESSION;
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static int pack_compression_seen;
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static unsigned long delta_cache_size = 0;
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static unsigned long max_delta_cache_size = 0;
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static unsigned long cache_max_small_delta_size = 1000;
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static unsigned long window_memory_usage = 0;
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static unsigned long window_memory_limit = 0;
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/*
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* The object names in objects array are hashed with this hashtable,
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* to help looking up the entry by object name.
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* This hashtable is built after all the objects are seen.
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*/
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static int *object_ix;
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static int object_ix_hashsz;
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/*
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* Pack index for existing packs give us easy access to the offsets into
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* corresponding pack file where each object's data starts, but the entries
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* do not store the size of the compressed representation (uncompressed
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* size is easily available by examining the pack entry header). It is
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* also rather expensive to find the sha1 for an object given its offset.
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*
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* We build a hashtable of existing packs (pack_revindex), and keep reverse
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* index here -- pack index file is sorted by object name mapping to offset;
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* this pack_revindex[].revindex array is a list of offset/index_nr pairs
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* ordered by offset, so if you know the offset of an object, next offset
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* is where its packed representation ends and the index_nr can be used to
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* get the object sha1 from the main index.
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*/
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struct revindex_entry {
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off_t offset;
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unsigned int nr;
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};
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struct pack_revindex {
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struct packed_git *p;
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struct revindex_entry *revindex;
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};
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static struct pack_revindex *pack_revindex;
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static int pack_revindex_hashsz;
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/*
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* stats
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*/
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static uint32_t written, written_delta;
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static uint32_t reused, reused_delta;
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static int pack_revindex_ix(struct packed_git *p)
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{
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unsigned long ui = (unsigned long)p;
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int i;
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ui = ui ^ (ui >> 16); /* defeat structure alignment */
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i = (int)(ui % pack_revindex_hashsz);
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while (pack_revindex[i].p) {
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if (pack_revindex[i].p == p)
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return i;
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if (++i == pack_revindex_hashsz)
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i = 0;
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}
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return -1 - i;
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}
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static void prepare_pack_ix(void)
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{
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int num;
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struct packed_git *p;
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for (num = 0, p = packed_git; p; p = p->next)
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num++;
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if (!num)
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return;
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pack_revindex_hashsz = num * 11;
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pack_revindex = xcalloc(sizeof(*pack_revindex), pack_revindex_hashsz);
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for (p = packed_git; p; p = p->next) {
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num = pack_revindex_ix(p);
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num = - 1 - num;
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pack_revindex[num].p = p;
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}
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/* revindex elements are lazily initialized */
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}
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static int cmp_offset(const void *a_, const void *b_)
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{
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const struct revindex_entry *a = a_;
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const struct revindex_entry *b = b_;
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return (a->offset < b->offset) ? -1 : (a->offset > b->offset) ? 1 : 0;
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}
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/*
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* Ordered list of offsets of objects in the pack.
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*/
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static void prepare_pack_revindex(struct pack_revindex *rix)
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{
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struct packed_git *p = rix->p;
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int num_ent = p->num_objects;
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int i;
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const char *index = p->index_data;
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rix->revindex = xmalloc(sizeof(*rix->revindex) * (num_ent + 1));
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index += 4 * 256;
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if (p->index_version > 1) {
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const uint32_t *off_32 =
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(uint32_t *)(index + 8 + p->num_objects * (20 + 4));
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const uint32_t *off_64 = off_32 + p->num_objects;
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for (i = 0; i < num_ent; i++) {
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uint32_t off = ntohl(*off_32++);
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if (!(off & 0x80000000)) {
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rix->revindex[i].offset = off;
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} else {
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rix->revindex[i].offset =
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((uint64_t)ntohl(*off_64++)) << 32;
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rix->revindex[i].offset |=
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ntohl(*off_64++);
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}
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rix->revindex[i].nr = i;
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}
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} else {
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for (i = 0; i < num_ent; i++) {
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uint32_t hl = *((uint32_t *)(index + 24 * i));
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rix->revindex[i].offset = ntohl(hl);
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rix->revindex[i].nr = i;
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}
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}
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/* This knows the pack format -- the 20-byte trailer
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* follows immediately after the last object data.
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*/
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rix->revindex[num_ent].offset = p->pack_size - 20;
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rix->revindex[num_ent].nr = -1;
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qsort(rix->revindex, num_ent, sizeof(*rix->revindex), cmp_offset);
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}
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static struct revindex_entry * find_packed_object(struct packed_git *p,
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off_t ofs)
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{
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int num;
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int lo, hi;
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struct pack_revindex *rix;
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struct revindex_entry *revindex;
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num = pack_revindex_ix(p);
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if (num < 0)
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die("internal error: pack revindex uninitialized");
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rix = &pack_revindex[num];
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if (!rix->revindex)
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prepare_pack_revindex(rix);
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revindex = rix->revindex;
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lo = 0;
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hi = p->num_objects + 1;
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do {
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int mi = (lo + hi) / 2;
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if (revindex[mi].offset == ofs) {
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return revindex + mi;
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}
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else if (ofs < revindex[mi].offset)
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hi = mi;
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else
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lo = mi + 1;
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} while (lo < hi);
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die("internal error: pack revindex corrupt");
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}
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static const unsigned char *find_packed_object_name(struct packed_git *p,
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off_t ofs)
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{
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struct revindex_entry *entry = find_packed_object(p, ofs);
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return nth_packed_object_sha1(p, entry->nr);
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}
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static void *delta_against(void *buf, unsigned long size, struct object_entry *entry)
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{
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unsigned long othersize, delta_size;
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enum object_type type;
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void *otherbuf = read_sha1_file(entry->delta->idx.sha1, &type, &othersize);
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void *delta_buf;
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if (!otherbuf)
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die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
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delta_buf = diff_delta(otherbuf, othersize,
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buf, size, &delta_size, 0);
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if (!delta_buf || delta_size != entry->delta_size)
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die("delta size changed");
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free(buf);
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free(otherbuf);
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return delta_buf;
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}
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/*
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* The per-object header is a pretty dense thing, which is
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* - first byte: low four bits are "size", then three bits of "type",
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* and the high bit is "size continues".
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* - each byte afterwards: low seven bits are size continuation,
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* with the high bit being "size continues"
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*/
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static int encode_header(enum object_type type, unsigned long size, unsigned char *hdr)
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{
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int n = 1;
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unsigned char c;
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if (type < OBJ_COMMIT || type > OBJ_REF_DELTA)
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die("bad type %d", type);
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c = (type << 4) | (size & 15);
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size >>= 4;
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while (size) {
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*hdr++ = c | 0x80;
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c = size & 0x7f;
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size >>= 7;
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n++;
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}
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*hdr = c;
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return n;
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}
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/*
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* we are going to reuse the existing object data as is. make
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* sure it is not corrupt.
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*/
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static int check_pack_inflate(struct packed_git *p,
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struct pack_window **w_curs,
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off_t offset,
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off_t len,
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unsigned long expect)
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{
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z_stream stream;
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unsigned char fakebuf[4096], *in;
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int st;
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memset(&stream, 0, sizeof(stream));
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inflateInit(&stream);
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do {
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in = use_pack(p, w_curs, offset, &stream.avail_in);
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stream.next_in = in;
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stream.next_out = fakebuf;
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stream.avail_out = sizeof(fakebuf);
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st = inflate(&stream, Z_FINISH);
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offset += stream.next_in - in;
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} while (st == Z_OK || st == Z_BUF_ERROR);
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inflateEnd(&stream);
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return (st == Z_STREAM_END &&
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stream.total_out == expect &&
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stream.total_in == len) ? 0 : -1;
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}
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static int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
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off_t offset, off_t len, unsigned int nr)
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{
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const uint32_t *index_crc;
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uint32_t data_crc = crc32(0, Z_NULL, 0);
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do {
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unsigned int avail;
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void *data = use_pack(p, w_curs, offset, &avail);
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if (avail > len)
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avail = len;
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data_crc = crc32(data_crc, data, avail);
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offset += avail;
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len -= avail;
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} while (len);
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index_crc = p->index_data;
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index_crc += 2 + 256 + p->num_objects * (20/4) + nr;
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return data_crc != ntohl(*index_crc);
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}
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static void copy_pack_data(struct sha1file *f,
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struct packed_git *p,
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struct pack_window **w_curs,
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off_t offset,
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off_t len)
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{
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unsigned char *in;
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unsigned int avail;
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while (len) {
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in = use_pack(p, w_curs, offset, &avail);
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if (avail > len)
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avail = (unsigned int)len;
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sha1write(f, in, avail);
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offset += avail;
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len -= avail;
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}
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}
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static unsigned long write_object(struct sha1file *f,
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struct object_entry *entry,
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off_t write_offset)
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{
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unsigned long size;
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enum object_type type;
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void *buf;
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unsigned char header[10];
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unsigned char dheader[10];
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unsigned hdrlen;
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off_t datalen;
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enum object_type obj_type;
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int to_reuse = 0;
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/* write limit if limited packsize and not first object */
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unsigned long limit = pack_size_limit && nr_written ?
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pack_size_limit - write_offset : 0;
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/* no if no delta */
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int usable_delta = !entry->delta ? 0 :
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/* yes if unlimited packfile */
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!pack_size_limit ? 1 :
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/* no if base written to previous pack */
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entry->delta->idx.offset == (off_t)-1 ? 0 :
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/* otherwise double-check written to this
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* pack, like we do below
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*/
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entry->delta->idx.offset ? 1 : 0;
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if (!pack_to_stdout)
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crc32_begin(f);
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obj_type = entry->type;
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if (no_reuse_object)
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to_reuse = 0; /* explicit */
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else if (!entry->in_pack)
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to_reuse = 0; /* can't reuse what we don't have */
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else if (obj_type == OBJ_REF_DELTA || obj_type == OBJ_OFS_DELTA)
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/* check_object() decided it for us ... */
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to_reuse = usable_delta;
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/* ... but pack split may override that */
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else if (obj_type != entry->in_pack_type)
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to_reuse = 0; /* pack has delta which is unusable */
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else if (entry->delta)
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to_reuse = 0; /* we want to pack afresh */
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else
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to_reuse = 1; /* we have it in-pack undeltified,
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* and we do not need to deltify it.
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*/
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if (!to_reuse) {
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z_stream stream;
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unsigned long maxsize;
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void *out;
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if (!usable_delta) {
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buf = read_sha1_file(entry->idx.sha1, &obj_type, &size);
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if (!buf)
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die("unable to read %s", sha1_to_hex(entry->idx.sha1));
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} else if (entry->delta_data) {
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size = entry->delta_size;
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buf = entry->delta_data;
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entry->delta_data = NULL;
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obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
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OBJ_OFS_DELTA : OBJ_REF_DELTA;
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} else {
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buf = read_sha1_file(entry->idx.sha1, &type, &size);
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if (!buf)
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die("unable to read %s", sha1_to_hex(entry->idx.sha1));
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buf = delta_against(buf, size, entry);
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size = entry->delta_size;
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obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
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OBJ_OFS_DELTA : OBJ_REF_DELTA;
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}
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/* compress the data to store and put compressed length in datalen */
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memset(&stream, 0, sizeof(stream));
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deflateInit(&stream, pack_compression_level);
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maxsize = deflateBound(&stream, size);
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out = xmalloc(maxsize);
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/* Compress it */
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stream.next_in = buf;
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stream.avail_in = size;
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stream.next_out = out;
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stream.avail_out = maxsize;
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while (deflate(&stream, Z_FINISH) == Z_OK)
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/* nothing */;
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deflateEnd(&stream);
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datalen = stream.total_out;
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deflateEnd(&stream);
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/*
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* The object header is a byte of 'type' followed by zero or
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* more bytes of length.
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*/
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hdrlen = encode_header(obj_type, size, header);
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if (obj_type == OBJ_OFS_DELTA) {
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/*
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* Deltas with relative base contain an additional
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* encoding of the relative offset for the delta
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* base from this object's position in the pack.
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*/
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off_t ofs = entry->idx.offset - entry->delta->idx.offset;
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unsigned pos = sizeof(dheader) - 1;
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dheader[pos] = ofs & 127;
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while (ofs >>= 7)
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dheader[--pos] = 128 | (--ofs & 127);
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if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
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free(out);
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free(buf);
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return 0;
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}
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sha1write(f, header, hdrlen);
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sha1write(f, dheader + pos, sizeof(dheader) - pos);
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hdrlen += sizeof(dheader) - pos;
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} else if (obj_type == OBJ_REF_DELTA) {
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/*
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* Deltas with a base reference contain
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* an additional 20 bytes for the base sha1.
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*/
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if (limit && hdrlen + 20 + datalen + 20 >= limit) {
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free(out);
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free(buf);
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return 0;
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}
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sha1write(f, header, hdrlen);
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sha1write(f, entry->delta->idx.sha1, 20);
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hdrlen += 20;
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} else {
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if (limit && hdrlen + datalen + 20 >= limit) {
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free(out);
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free(buf);
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return 0;
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}
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sha1write(f, header, hdrlen);
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}
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sha1write(f, out, datalen);
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free(out);
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free(buf);
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}
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|
else {
|
|
struct packed_git *p = entry->in_pack;
|
|
struct pack_window *w_curs = NULL;
|
|
struct revindex_entry *revidx;
|
|
off_t offset;
|
|
|
|
if (entry->delta) {
|
|
obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
|
|
OBJ_OFS_DELTA : OBJ_REF_DELTA;
|
|
reused_delta++;
|
|
}
|
|
hdrlen = encode_header(obj_type, entry->size, header);
|
|
offset = entry->in_pack_offset;
|
|
revidx = find_packed_object(p, offset);
|
|
datalen = revidx[1].offset - offset;
|
|
if (!pack_to_stdout && p->index_version > 1 &&
|
|
check_pack_crc(p, &w_curs, offset, datalen, revidx->nr))
|
|
die("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
|
|
offset += entry->in_pack_header_size;
|
|
datalen -= entry->in_pack_header_size;
|
|
if (obj_type == OBJ_OFS_DELTA) {
|
|
off_t ofs = entry->idx.offset - entry->delta->idx.offset;
|
|
unsigned pos = sizeof(dheader) - 1;
|
|
dheader[pos] = ofs & 127;
|
|
while (ofs >>= 7)
|
|
dheader[--pos] = 128 | (--ofs & 127);
|
|
if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit)
|
|
return 0;
|
|
sha1write(f, header, hdrlen);
|
|
sha1write(f, dheader + pos, sizeof(dheader) - pos);
|
|
hdrlen += sizeof(dheader) - pos;
|
|
} else if (obj_type == OBJ_REF_DELTA) {
|
|
if (limit && hdrlen + 20 + datalen + 20 >= limit)
|
|
return 0;
|
|
sha1write(f, header, hdrlen);
|
|
sha1write(f, entry->delta->idx.sha1, 20);
|
|
hdrlen += 20;
|
|
} else {
|
|
if (limit && hdrlen + datalen + 20 >= limit)
|
|
return 0;
|
|
sha1write(f, header, hdrlen);
|
|
}
|
|
|
|
if (!pack_to_stdout && p->index_version == 1 &&
|
|
check_pack_inflate(p, &w_curs, offset, datalen, entry->size))
|
|
die("corrupt packed object for %s", sha1_to_hex(entry->idx.sha1));
|
|
copy_pack_data(f, p, &w_curs, offset, datalen);
|
|
unuse_pack(&w_curs);
|
|
reused++;
|
|
}
|
|
if (usable_delta)
|
|
written_delta++;
|
|
written++;
|
|
if (!pack_to_stdout)
|
|
entry->idx.crc32 = crc32_end(f);
|
|
return hdrlen + datalen;
|
|
}
|
|
|
|
static off_t write_one(struct sha1file *f,
|
|
struct object_entry *e,
|
|
off_t offset)
|
|
{
|
|
unsigned long size;
|
|
|
|
/* offset is non zero if object is written already. */
|
|
if (e->idx.offset || e->preferred_base)
|
|
return offset;
|
|
|
|
/* if we are deltified, write out base object first. */
|
|
if (e->delta) {
|
|
offset = write_one(f, e->delta, offset);
|
|
if (!offset)
|
|
return 0;
|
|
}
|
|
|
|
e->idx.offset = offset;
|
|
size = write_object(f, e, offset);
|
|
if (!size) {
|
|
e->idx.offset = 0;
|
|
return 0;
|
|
}
|
|
written_list[nr_written++] = e;
|
|
|
|
/* make sure off_t is sufficiently large not to wrap */
|
|
if (offset > offset + size)
|
|
die("pack too large for current definition of off_t");
|
|
return offset + size;
|
|
}
|
|
|
|
static int open_object_dir_tmp(const char *path)
|
|
{
|
|
snprintf(tmpname, sizeof(tmpname), "%s/%s", get_object_directory(), path);
|
|
return xmkstemp(tmpname);
|
|
}
|
|
|
|
/* forward declaration for write_pack_file */
|
|
static int adjust_perm(const char *path, mode_t mode);
|
|
|
|
static void write_pack_file(void)
|
|
{
|
|
uint32_t i = 0, j;
|
|
struct sha1file *f;
|
|
off_t offset, offset_one, last_obj_offset = 0;
|
|
struct pack_header hdr;
|
|
int do_progress = progress >> pack_to_stdout;
|
|
uint32_t nr_remaining = nr_result;
|
|
|
|
if (do_progress)
|
|
start_progress(&progress_state, "Writing %u objects...", "", nr_result);
|
|
written_list = xmalloc(nr_objects * sizeof(struct object_entry *));
|
|
|
|
do {
|
|
unsigned char sha1[20];
|
|
|
|
if (pack_to_stdout) {
|
|
f = sha1fd(1, "<stdout>");
|
|
} else {
|
|
int fd = open_object_dir_tmp("tmp_pack_XXXXXX");
|
|
pack_tmp_name = xstrdup(tmpname);
|
|
f = sha1fd(fd, pack_tmp_name);
|
|
}
|
|
|
|
hdr.hdr_signature = htonl(PACK_SIGNATURE);
|
|
hdr.hdr_version = htonl(PACK_VERSION);
|
|
hdr.hdr_entries = htonl(nr_remaining);
|
|
sha1write(f, &hdr, sizeof(hdr));
|
|
offset = sizeof(hdr);
|
|
nr_written = 0;
|
|
for (; i < nr_objects; i++) {
|
|
last_obj_offset = offset;
|
|
offset_one = write_one(f, objects + i, offset);
|
|
if (!offset_one)
|
|
break;
|
|
offset = offset_one;
|
|
if (do_progress)
|
|
display_progress(&progress_state, written);
|
|
}
|
|
|
|
/*
|
|
* Did we write the wrong # entries in the header?
|
|
* If so, rewrite it like in fast-import
|
|
*/
|
|
if (pack_to_stdout || nr_written == nr_remaining) {
|
|
sha1close(f, sha1, 1);
|
|
} else {
|
|
sha1close(f, sha1, 0);
|
|
fixup_pack_header_footer(f->fd, sha1, pack_tmp_name, nr_written);
|
|
close(f->fd);
|
|
}
|
|
|
|
if (!pack_to_stdout) {
|
|
mode_t mode = umask(0);
|
|
|
|
umask(mode);
|
|
mode = 0444 & ~mode;
|
|
|
|
idx_tmp_name = write_idx_file(NULL,
|
|
(struct pack_idx_entry **) written_list, nr_written, sha1);
|
|
snprintf(tmpname, sizeof(tmpname), "%s-%s.pack",
|
|
base_name, sha1_to_hex(sha1));
|
|
if (adjust_perm(pack_tmp_name, mode))
|
|
die("unable to make temporary pack file readable: %s",
|
|
strerror(errno));
|
|
if (rename(pack_tmp_name, tmpname))
|
|
die("unable to rename temporary pack file: %s",
|
|
strerror(errno));
|
|
snprintf(tmpname, sizeof(tmpname), "%s-%s.idx",
|
|
base_name, sha1_to_hex(sha1));
|
|
if (adjust_perm(idx_tmp_name, mode))
|
|
die("unable to make temporary index file readable: %s",
|
|
strerror(errno));
|
|
if (rename(idx_tmp_name, tmpname))
|
|
die("unable to rename temporary index file: %s",
|
|
strerror(errno));
|
|
puts(sha1_to_hex(sha1));
|
|
}
|
|
|
|
/* mark written objects as written to previous pack */
|
|
for (j = 0; j < nr_written; j++) {
|
|
written_list[j]->idx.offset = (off_t)-1;
|
|
}
|
|
nr_remaining -= nr_written;
|
|
} while (nr_remaining && i < nr_objects);
|
|
|
|
free(written_list);
|
|
if (do_progress)
|
|
stop_progress(&progress_state);
|
|
if (written != nr_result)
|
|
die("wrote %u objects while expecting %u", written, nr_result);
|
|
/*
|
|
* We have scanned through [0 ... i). Since we have written
|
|
* the correct number of objects, the remaining [i ... nr_objects)
|
|
* items must be either already written (due to out-of-order delta base)
|
|
* or a preferred base. Count those which are neither and complain if any.
|
|
*/
|
|
for (j = 0; i < nr_objects; i++) {
|
|
struct object_entry *e = objects + i;
|
|
j += !e->idx.offset && !e->preferred_base;
|
|
}
|
|
if (j)
|
|
die("wrote %u objects as expected but %u unwritten", written, j);
|
|
}
|
|
|
|
static int locate_object_entry_hash(const unsigned char *sha1)
|
|
{
|
|
int i;
|
|
unsigned int ui;
|
|
memcpy(&ui, sha1, sizeof(unsigned int));
|
|
i = ui % object_ix_hashsz;
|
|
while (0 < object_ix[i]) {
|
|
if (!hashcmp(sha1, objects[object_ix[i] - 1].idx.sha1))
|
|
return i;
|
|
if (++i == object_ix_hashsz)
|
|
i = 0;
|
|
}
|
|
return -1 - i;
|
|
}
|
|
|
|
static struct object_entry *locate_object_entry(const unsigned char *sha1)
|
|
{
|
|
int i;
|
|
|
|
if (!object_ix_hashsz)
|
|
return NULL;
|
|
|
|
i = locate_object_entry_hash(sha1);
|
|
if (0 <= i)
|
|
return &objects[object_ix[i]-1];
|
|
return NULL;
|
|
}
|
|
|
|
static void rehash_objects(void)
|
|
{
|
|
uint32_t i;
|
|
struct object_entry *oe;
|
|
|
|
object_ix_hashsz = nr_objects * 3;
|
|
if (object_ix_hashsz < 1024)
|
|
object_ix_hashsz = 1024;
|
|
object_ix = xrealloc(object_ix, sizeof(int) * object_ix_hashsz);
|
|
memset(object_ix, 0, sizeof(int) * object_ix_hashsz);
|
|
for (i = 0, oe = objects; i < nr_objects; i++, oe++) {
|
|
int ix = locate_object_entry_hash(oe->idx.sha1);
|
|
if (0 <= ix)
|
|
continue;
|
|
ix = -1 - ix;
|
|
object_ix[ix] = i + 1;
|
|
}
|
|
}
|
|
|
|
static unsigned name_hash(const char *name)
|
|
{
|
|
unsigned char c;
|
|
unsigned hash = 0;
|
|
|
|
if (!name)
|
|
return 0;
|
|
|
|
/*
|
|
* This effectively just creates a sortable number from the
|
|
* last sixteen non-whitespace characters. Last characters
|
|
* count "most", so things that end in ".c" sort together.
|
|
*/
|
|
while ((c = *name++) != 0) {
|
|
if (isspace(c))
|
|
continue;
|
|
hash = (hash >> 2) + (c << 24);
|
|
}
|
|
return hash;
|
|
}
|
|
|
|
static void setup_delta_attr_check(struct git_attr_check *check)
|
|
{
|
|
static struct git_attr *attr_delta;
|
|
|
|
if (!attr_delta)
|
|
attr_delta = git_attr("delta", 5);
|
|
|
|
check[0].attr = attr_delta;
|
|
}
|
|
|
|
static int no_try_delta(const char *path)
|
|
{
|
|
struct git_attr_check check[1];
|
|
|
|
setup_delta_attr_check(check);
|
|
if (git_checkattr(path, ARRAY_SIZE(check), check))
|
|
return 0;
|
|
if (ATTR_FALSE(check->value))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int add_object_entry(const unsigned char *sha1, enum object_type type,
|
|
const char *name, int exclude)
|
|
{
|
|
struct object_entry *entry;
|
|
struct packed_git *p, *found_pack = NULL;
|
|
off_t found_offset = 0;
|
|
int ix;
|
|
unsigned hash = name_hash(name);
|
|
|
|
ix = nr_objects ? locate_object_entry_hash(sha1) : -1;
|
|
if (ix >= 0) {
|
|
if (exclude) {
|
|
entry = objects + object_ix[ix] - 1;
|
|
if (!entry->preferred_base)
|
|
nr_result--;
|
|
entry->preferred_base = 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
for (p = packed_git; p; p = p->next) {
|
|
off_t offset = find_pack_entry_one(sha1, p);
|
|
if (offset) {
|
|
if (!found_pack) {
|
|
found_offset = offset;
|
|
found_pack = p;
|
|
}
|
|
if (exclude)
|
|
break;
|
|
if (incremental)
|
|
return 0;
|
|
if (local && !p->pack_local)
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (nr_objects >= nr_alloc) {
|
|
nr_alloc = (nr_alloc + 1024) * 3 / 2;
|
|
objects = xrealloc(objects, nr_alloc * sizeof(*entry));
|
|
}
|
|
|
|
entry = objects + nr_objects++;
|
|
memset(entry, 0, sizeof(*entry));
|
|
hashcpy(entry->idx.sha1, sha1);
|
|
entry->hash = hash;
|
|
if (type)
|
|
entry->type = type;
|
|
if (exclude)
|
|
entry->preferred_base = 1;
|
|
else
|
|
nr_result++;
|
|
if (found_pack) {
|
|
entry->in_pack = found_pack;
|
|
entry->in_pack_offset = found_offset;
|
|
}
|
|
|
|
if (object_ix_hashsz * 3 <= nr_objects * 4)
|
|
rehash_objects();
|
|
else
|
|
object_ix[-1 - ix] = nr_objects;
|
|
|
|
if (progress)
|
|
display_progress(&progress_state, nr_objects);
|
|
|
|
if (name && no_try_delta(name))
|
|
entry->no_try_delta = 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
struct pbase_tree_cache {
|
|
unsigned char sha1[20];
|
|
int ref;
|
|
int temporary;
|
|
void *tree_data;
|
|
unsigned long tree_size;
|
|
};
|
|
|
|
static struct pbase_tree_cache *(pbase_tree_cache[256]);
|
|
static int pbase_tree_cache_ix(const unsigned char *sha1)
|
|
{
|
|
return sha1[0] % ARRAY_SIZE(pbase_tree_cache);
|
|
}
|
|
static int pbase_tree_cache_ix_incr(int ix)
|
|
{
|
|
return (ix+1) % ARRAY_SIZE(pbase_tree_cache);
|
|
}
|
|
|
|
static struct pbase_tree {
|
|
struct pbase_tree *next;
|
|
/* This is a phony "cache" entry; we are not
|
|
* going to evict it nor find it through _get()
|
|
* mechanism -- this is for the toplevel node that
|
|
* would almost always change with any commit.
|
|
*/
|
|
struct pbase_tree_cache pcache;
|
|
} *pbase_tree;
|
|
|
|
static struct pbase_tree_cache *pbase_tree_get(const unsigned char *sha1)
|
|
{
|
|
struct pbase_tree_cache *ent, *nent;
|
|
void *data;
|
|
unsigned long size;
|
|
enum object_type type;
|
|
int neigh;
|
|
int my_ix = pbase_tree_cache_ix(sha1);
|
|
int available_ix = -1;
|
|
|
|
/* pbase-tree-cache acts as a limited hashtable.
|
|
* your object will be found at your index or within a few
|
|
* slots after that slot if it is cached.
|
|
*/
|
|
for (neigh = 0; neigh < 8; neigh++) {
|
|
ent = pbase_tree_cache[my_ix];
|
|
if (ent && !hashcmp(ent->sha1, sha1)) {
|
|
ent->ref++;
|
|
return ent;
|
|
}
|
|
else if (((available_ix < 0) && (!ent || !ent->ref)) ||
|
|
((0 <= available_ix) &&
|
|
(!ent && pbase_tree_cache[available_ix])))
|
|
available_ix = my_ix;
|
|
if (!ent)
|
|
break;
|
|
my_ix = pbase_tree_cache_ix_incr(my_ix);
|
|
}
|
|
|
|
/* Did not find one. Either we got a bogus request or
|
|
* we need to read and perhaps cache.
|
|
*/
|
|
data = read_sha1_file(sha1, &type, &size);
|
|
if (!data)
|
|
return NULL;
|
|
if (type != OBJ_TREE) {
|
|
free(data);
|
|
return NULL;
|
|
}
|
|
|
|
/* We need to either cache or return a throwaway copy */
|
|
|
|
if (available_ix < 0)
|
|
ent = NULL;
|
|
else {
|
|
ent = pbase_tree_cache[available_ix];
|
|
my_ix = available_ix;
|
|
}
|
|
|
|
if (!ent) {
|
|
nent = xmalloc(sizeof(*nent));
|
|
nent->temporary = (available_ix < 0);
|
|
}
|
|
else {
|
|
/* evict and reuse */
|
|
free(ent->tree_data);
|
|
nent = ent;
|
|
}
|
|
hashcpy(nent->sha1, sha1);
|
|
nent->tree_data = data;
|
|
nent->tree_size = size;
|
|
nent->ref = 1;
|
|
if (!nent->temporary)
|
|
pbase_tree_cache[my_ix] = nent;
|
|
return nent;
|
|
}
|
|
|
|
static void pbase_tree_put(struct pbase_tree_cache *cache)
|
|
{
|
|
if (!cache->temporary) {
|
|
cache->ref--;
|
|
return;
|
|
}
|
|
free(cache->tree_data);
|
|
free(cache);
|
|
}
|
|
|
|
static int name_cmp_len(const char *name)
|
|
{
|
|
int i;
|
|
for (i = 0; name[i] && name[i] != '\n' && name[i] != '/'; i++)
|
|
;
|
|
return i;
|
|
}
|
|
|
|
static void add_pbase_object(struct tree_desc *tree,
|
|
const char *name,
|
|
int cmplen,
|
|
const char *fullname)
|
|
{
|
|
struct name_entry entry;
|
|
int cmp;
|
|
|
|
while (tree_entry(tree,&entry)) {
|
|
if (S_ISGITLINK(entry.mode))
|
|
continue;
|
|
cmp = tree_entry_len(entry.path, entry.sha1) != cmplen ? 1 :
|
|
memcmp(name, entry.path, cmplen);
|
|
if (cmp > 0)
|
|
continue;
|
|
if (cmp < 0)
|
|
return;
|
|
if (name[cmplen] != '/') {
|
|
add_object_entry(entry.sha1,
|
|
S_ISDIR(entry.mode) ? OBJ_TREE : OBJ_BLOB,
|
|
fullname, 1);
|
|
return;
|
|
}
|
|
if (S_ISDIR(entry.mode)) {
|
|
struct tree_desc sub;
|
|
struct pbase_tree_cache *tree;
|
|
const char *down = name+cmplen+1;
|
|
int downlen = name_cmp_len(down);
|
|
|
|
tree = pbase_tree_get(entry.sha1);
|
|
if (!tree)
|
|
return;
|
|
init_tree_desc(&sub, tree->tree_data, tree->tree_size);
|
|
|
|
add_pbase_object(&sub, down, downlen, fullname);
|
|
pbase_tree_put(tree);
|
|
}
|
|
}
|
|
}
|
|
|
|
static unsigned *done_pbase_paths;
|
|
static int done_pbase_paths_num;
|
|
static int done_pbase_paths_alloc;
|
|
static int done_pbase_path_pos(unsigned hash)
|
|
{
|
|
int lo = 0;
|
|
int hi = done_pbase_paths_num;
|
|
while (lo < hi) {
|
|
int mi = (hi + lo) / 2;
|
|
if (done_pbase_paths[mi] == hash)
|
|
return mi;
|
|
if (done_pbase_paths[mi] < hash)
|
|
hi = mi;
|
|
else
|
|
lo = mi + 1;
|
|
}
|
|
return -lo-1;
|
|
}
|
|
|
|
static int check_pbase_path(unsigned hash)
|
|
{
|
|
int pos = (!done_pbase_paths) ? -1 : done_pbase_path_pos(hash);
|
|
if (0 <= pos)
|
|
return 1;
|
|
pos = -pos - 1;
|
|
if (done_pbase_paths_alloc <= done_pbase_paths_num) {
|
|
done_pbase_paths_alloc = alloc_nr(done_pbase_paths_alloc);
|
|
done_pbase_paths = xrealloc(done_pbase_paths,
|
|
done_pbase_paths_alloc *
|
|
sizeof(unsigned));
|
|
}
|
|
done_pbase_paths_num++;
|
|
if (pos < done_pbase_paths_num)
|
|
memmove(done_pbase_paths + pos + 1,
|
|
done_pbase_paths + pos,
|
|
(done_pbase_paths_num - pos - 1) * sizeof(unsigned));
|
|
done_pbase_paths[pos] = hash;
|
|
return 0;
|
|
}
|
|
|
|
static void add_preferred_base_object(const char *name)
|
|
{
|
|
struct pbase_tree *it;
|
|
int cmplen;
|
|
unsigned hash = name_hash(name);
|
|
|
|
if (!num_preferred_base || check_pbase_path(hash))
|
|
return;
|
|
|
|
cmplen = name_cmp_len(name);
|
|
for (it = pbase_tree; it; it = it->next) {
|
|
if (cmplen == 0) {
|
|
add_object_entry(it->pcache.sha1, OBJ_TREE, NULL, 1);
|
|
}
|
|
else {
|
|
struct tree_desc tree;
|
|
init_tree_desc(&tree, it->pcache.tree_data, it->pcache.tree_size);
|
|
add_pbase_object(&tree, name, cmplen, name);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void add_preferred_base(unsigned char *sha1)
|
|
{
|
|
struct pbase_tree *it;
|
|
void *data;
|
|
unsigned long size;
|
|
unsigned char tree_sha1[20];
|
|
|
|
if (window <= num_preferred_base++)
|
|
return;
|
|
|
|
data = read_object_with_reference(sha1, tree_type, &size, tree_sha1);
|
|
if (!data)
|
|
return;
|
|
|
|
for (it = pbase_tree; it; it = it->next) {
|
|
if (!hashcmp(it->pcache.sha1, tree_sha1)) {
|
|
free(data);
|
|
return;
|
|
}
|
|
}
|
|
|
|
it = xcalloc(1, sizeof(*it));
|
|
it->next = pbase_tree;
|
|
pbase_tree = it;
|
|
|
|
hashcpy(it->pcache.sha1, tree_sha1);
|
|
it->pcache.tree_data = data;
|
|
it->pcache.tree_size = size;
|
|
}
|
|
|
|
static void check_object(struct object_entry *entry)
|
|
{
|
|
if (entry->in_pack) {
|
|
struct packed_git *p = entry->in_pack;
|
|
struct pack_window *w_curs = NULL;
|
|
const unsigned char *base_ref = NULL;
|
|
struct object_entry *base_entry;
|
|
unsigned long used, used_0;
|
|
unsigned int avail;
|
|
off_t ofs;
|
|
unsigned char *buf, c;
|
|
|
|
buf = use_pack(p, &w_curs, entry->in_pack_offset, &avail);
|
|
|
|
/*
|
|
* We want in_pack_type even if we do not reuse delta
|
|
* since non-delta representations could still be reused.
|
|
*/
|
|
used = unpack_object_header_gently(buf, avail,
|
|
&entry->in_pack_type,
|
|
&entry->size);
|
|
|
|
/*
|
|
* Determine if this is a delta and if so whether we can
|
|
* reuse it or not. Otherwise let's find out as cheaply as
|
|
* possible what the actual type and size for this object is.
|
|
*/
|
|
switch (entry->in_pack_type) {
|
|
default:
|
|
/* Not a delta hence we've already got all we need. */
|
|
entry->type = entry->in_pack_type;
|
|
entry->in_pack_header_size = used;
|
|
unuse_pack(&w_curs);
|
|
return;
|
|
case OBJ_REF_DELTA:
|
|
if (!no_reuse_delta && !entry->preferred_base)
|
|
base_ref = use_pack(p, &w_curs,
|
|
entry->in_pack_offset + used, NULL);
|
|
entry->in_pack_header_size = used + 20;
|
|
break;
|
|
case OBJ_OFS_DELTA:
|
|
buf = use_pack(p, &w_curs,
|
|
entry->in_pack_offset + used, NULL);
|
|
used_0 = 0;
|
|
c = buf[used_0++];
|
|
ofs = c & 127;
|
|
while (c & 128) {
|
|
ofs += 1;
|
|
if (!ofs || MSB(ofs, 7))
|
|
die("delta base offset overflow in pack for %s",
|
|
sha1_to_hex(entry->idx.sha1));
|
|
c = buf[used_0++];
|
|
ofs = (ofs << 7) + (c & 127);
|
|
}
|
|
if (ofs >= entry->in_pack_offset)
|
|
die("delta base offset out of bound for %s",
|
|
sha1_to_hex(entry->idx.sha1));
|
|
ofs = entry->in_pack_offset - ofs;
|
|
if (!no_reuse_delta && !entry->preferred_base)
|
|
base_ref = find_packed_object_name(p, ofs);
|
|
entry->in_pack_header_size = used + used_0;
|
|
break;
|
|
}
|
|
|
|
if (base_ref && (base_entry = locate_object_entry(base_ref))) {
|
|
/*
|
|
* If base_ref was set above that means we wish to
|
|
* reuse delta data, and we even found that base
|
|
* in the list of objects we want to pack. Goodie!
|
|
*
|
|
* Depth value does not matter - find_deltas() will
|
|
* never consider reused delta as the base object to
|
|
* deltify other objects against, in order to avoid
|
|
* circular deltas.
|
|
*/
|
|
entry->type = entry->in_pack_type;
|
|
entry->delta = base_entry;
|
|
entry->delta_sibling = base_entry->delta_child;
|
|
base_entry->delta_child = entry;
|
|
unuse_pack(&w_curs);
|
|
return;
|
|
}
|
|
|
|
if (entry->type) {
|
|
/*
|
|
* This must be a delta and we already know what the
|
|
* final object type is. Let's extract the actual
|
|
* object size from the delta header.
|
|
*/
|
|
entry->size = get_size_from_delta(p, &w_curs,
|
|
entry->in_pack_offset + entry->in_pack_header_size);
|
|
unuse_pack(&w_curs);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* No choice but to fall back to the recursive delta walk
|
|
* with sha1_object_info() to find about the object type
|
|
* at this point...
|
|
*/
|
|
unuse_pack(&w_curs);
|
|
}
|
|
|
|
entry->type = sha1_object_info(entry->idx.sha1, &entry->size);
|
|
if (entry->type < 0)
|
|
die("unable to get type of object %s",
|
|
sha1_to_hex(entry->idx.sha1));
|
|
}
|
|
|
|
static int pack_offset_sort(const void *_a, const void *_b)
|
|
{
|
|
const struct object_entry *a = *(struct object_entry **)_a;
|
|
const struct object_entry *b = *(struct object_entry **)_b;
|
|
|
|
/* avoid filesystem trashing with loose objects */
|
|
if (!a->in_pack && !b->in_pack)
|
|
return hashcmp(a->idx.sha1, b->idx.sha1);
|
|
|
|
if (a->in_pack < b->in_pack)
|
|
return -1;
|
|
if (a->in_pack > b->in_pack)
|
|
return 1;
|
|
return a->in_pack_offset < b->in_pack_offset ? -1 :
|
|
(a->in_pack_offset > b->in_pack_offset);
|
|
}
|
|
|
|
static void get_object_details(void)
|
|
{
|
|
uint32_t i;
|
|
struct object_entry **sorted_by_offset;
|
|
|
|
sorted_by_offset = xcalloc(nr_objects, sizeof(struct object_entry *));
|
|
for (i = 0; i < nr_objects; i++)
|
|
sorted_by_offset[i] = objects + i;
|
|
qsort(sorted_by_offset, nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
|
|
|
|
prepare_pack_ix();
|
|
for (i = 0; i < nr_objects; i++)
|
|
check_object(sorted_by_offset[i]);
|
|
free(sorted_by_offset);
|
|
}
|
|
|
|
static int type_size_sort(const void *_a, const void *_b)
|
|
{
|
|
const struct object_entry *a = *(struct object_entry **)_a;
|
|
const struct object_entry *b = *(struct object_entry **)_b;
|
|
|
|
if (a->type < b->type)
|
|
return -1;
|
|
if (a->type > b->type)
|
|
return 1;
|
|
if (a->hash < b->hash)
|
|
return -1;
|
|
if (a->hash > b->hash)
|
|
return 1;
|
|
if (a->preferred_base < b->preferred_base)
|
|
return -1;
|
|
if (a->preferred_base > b->preferred_base)
|
|
return 1;
|
|
if (a->size < b->size)
|
|
return -1;
|
|
if (a->size > b->size)
|
|
return 1;
|
|
return a > b ? -1 : (a < b); /* newest last */
|
|
}
|
|
|
|
struct unpacked {
|
|
struct object_entry *entry;
|
|
void *data;
|
|
struct delta_index *index;
|
|
unsigned depth;
|
|
};
|
|
|
|
static int delta_cacheable(unsigned long src_size, unsigned long trg_size,
|
|
unsigned long delta_size)
|
|
{
|
|
if (max_delta_cache_size && delta_cache_size + delta_size > max_delta_cache_size)
|
|
return 0;
|
|
|
|
if (delta_size < cache_max_small_delta_size)
|
|
return 1;
|
|
|
|
/* cache delta, if objects are large enough compared to delta size */
|
|
if ((src_size >> 20) + (trg_size >> 21) > (delta_size >> 10))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We search for deltas _backwards_ in a list sorted by type and
|
|
* by size, so that we see progressively smaller and smaller files.
|
|
* That's because we prefer deltas to be from the bigger file
|
|
* to the smaller - deletes are potentially cheaper, but perhaps
|
|
* more importantly, the bigger file is likely the more recent
|
|
* one.
|
|
*/
|
|
static int try_delta(struct unpacked *trg, struct unpacked *src,
|
|
unsigned max_depth)
|
|
{
|
|
struct object_entry *trg_entry = trg->entry;
|
|
struct object_entry *src_entry = src->entry;
|
|
unsigned long trg_size, src_size, delta_size, sizediff, max_size, sz;
|
|
unsigned ref_depth;
|
|
enum object_type type;
|
|
void *delta_buf;
|
|
|
|
/* Don't bother doing diffs between different types */
|
|
if (trg_entry->type != src_entry->type)
|
|
return -1;
|
|
|
|
/* We do not compute delta to *create* objects we are not
|
|
* going to pack.
|
|
*/
|
|
if (trg_entry->preferred_base)
|
|
return -1;
|
|
|
|
/*
|
|
* We do not bother to try a delta that we discarded
|
|
* on an earlier try, but only when reusing delta data.
|
|
*/
|
|
if (!no_reuse_delta && trg_entry->in_pack &&
|
|
trg_entry->in_pack == src_entry->in_pack &&
|
|
trg_entry->in_pack_type != OBJ_REF_DELTA &&
|
|
trg_entry->in_pack_type != OBJ_OFS_DELTA)
|
|
return 0;
|
|
|
|
/* Let's not bust the allowed depth. */
|
|
if (src->depth >= max_depth)
|
|
return 0;
|
|
|
|
/* Now some size filtering heuristics. */
|
|
trg_size = trg_entry->size;
|
|
if (!trg_entry->delta) {
|
|
max_size = trg_size/2 - 20;
|
|
ref_depth = 1;
|
|
} else {
|
|
max_size = trg_entry->delta_size;
|
|
ref_depth = trg->depth;
|
|
}
|
|
max_size = max_size * (max_depth - src->depth) /
|
|
(max_depth - ref_depth + 1);
|
|
if (max_size == 0)
|
|
return 0;
|
|
src_size = src_entry->size;
|
|
sizediff = src_size < trg_size ? trg_size - src_size : 0;
|
|
if (sizediff >= max_size)
|
|
return 0;
|
|
if (trg_size < src_size / 32)
|
|
return 0;
|
|
|
|
/* Load data if not already done */
|
|
if (!trg->data) {
|
|
trg->data = read_sha1_file(trg_entry->idx.sha1, &type, &sz);
|
|
if (!trg->data)
|
|
die("object %s cannot be read",
|
|
sha1_to_hex(trg_entry->idx.sha1));
|
|
if (sz != trg_size)
|
|
die("object %s inconsistent object length (%lu vs %lu)",
|
|
sha1_to_hex(trg_entry->idx.sha1), sz, trg_size);
|
|
window_memory_usage += sz;
|
|
}
|
|
if (!src->data) {
|
|
src->data = read_sha1_file(src_entry->idx.sha1, &type, &sz);
|
|
if (!src->data)
|
|
die("object %s cannot be read",
|
|
sha1_to_hex(src_entry->idx.sha1));
|
|
if (sz != src_size)
|
|
die("object %s inconsistent object length (%lu vs %lu)",
|
|
sha1_to_hex(src_entry->idx.sha1), sz, src_size);
|
|
window_memory_usage += sz;
|
|
}
|
|
if (!src->index) {
|
|
src->index = create_delta_index(src->data, src_size);
|
|
if (!src->index) {
|
|
static int warned = 0;
|
|
if (!warned++)
|
|
warning("suboptimal pack - out of memory");
|
|
return 0;
|
|
}
|
|
window_memory_usage += sizeof_delta_index(src->index);
|
|
}
|
|
|
|
delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
|
|
if (!delta_buf)
|
|
return 0;
|
|
|
|
if (trg_entry->delta_data) {
|
|
/* Prefer only shallower same-sized deltas. */
|
|
if (delta_size == trg_entry->delta_size &&
|
|
src->depth + 1 >= trg->depth) {
|
|
free(delta_buf);
|
|
return 0;
|
|
}
|
|
delta_cache_size -= trg_entry->delta_size;
|
|
free(trg_entry->delta_data);
|
|
trg_entry->delta_data = NULL;
|
|
}
|
|
trg_entry->delta = src_entry;
|
|
trg_entry->delta_size = delta_size;
|
|
trg->depth = src->depth + 1;
|
|
|
|
if (delta_cacheable(src_size, trg_size, delta_size)) {
|
|
trg_entry->delta_data = xrealloc(delta_buf, delta_size);
|
|
delta_cache_size += trg_entry->delta_size;
|
|
} else
|
|
free(delta_buf);
|
|
return 1;
|
|
}
|
|
|
|
static unsigned int check_delta_limit(struct object_entry *me, unsigned int n)
|
|
{
|
|
struct object_entry *child = me->delta_child;
|
|
unsigned int m = n;
|
|
while (child) {
|
|
unsigned int c = check_delta_limit(child, n + 1);
|
|
if (m < c)
|
|
m = c;
|
|
child = child->delta_sibling;
|
|
}
|
|
return m;
|
|
}
|
|
|
|
static void free_unpacked(struct unpacked *n)
|
|
{
|
|
window_memory_usage -= sizeof_delta_index(n->index);
|
|
free_delta_index(n->index);
|
|
n->index = NULL;
|
|
if (n->data) {
|
|
free(n->data);
|
|
n->data = NULL;
|
|
window_memory_usage -= n->entry->size;
|
|
}
|
|
n->entry = NULL;
|
|
n->depth = 0;
|
|
}
|
|
|
|
static void find_deltas(struct object_entry **list, int window, int depth)
|
|
{
|
|
uint32_t i = nr_objects, idx = 0, count = 0, processed = 0;
|
|
unsigned int array_size = window * sizeof(struct unpacked);
|
|
struct unpacked *array;
|
|
int max_depth;
|
|
|
|
if (!nr_objects)
|
|
return;
|
|
array = xmalloc(array_size);
|
|
memset(array, 0, array_size);
|
|
if (progress)
|
|
start_progress(&progress_state, "Deltifying %u objects...", "", nr_result);
|
|
|
|
do {
|
|
struct object_entry *entry = list[--i];
|
|
struct unpacked *n = array + idx;
|
|
int j;
|
|
|
|
if (!entry->preferred_base)
|
|
processed++;
|
|
|
|
if (progress)
|
|
display_progress(&progress_state, processed);
|
|
|
|
if (entry->delta)
|
|
/* This happens if we decided to reuse existing
|
|
* delta from a pack. "!no_reuse_delta &&" is implied.
|
|
*/
|
|
continue;
|
|
|
|
if (entry->size < 50)
|
|
continue;
|
|
|
|
if (entry->no_try_delta)
|
|
continue;
|
|
|
|
free_unpacked(n);
|
|
n->entry = entry;
|
|
|
|
while (window_memory_limit &&
|
|
window_memory_usage > window_memory_limit &&
|
|
count > 1) {
|
|
uint32_t tail = (idx + window - count) % window;
|
|
free_unpacked(array + tail);
|
|
count--;
|
|
}
|
|
|
|
/*
|
|
* If the current object is at pack edge, take the depth the
|
|
* objects that depend on the current object into account
|
|
* otherwise they would become too deep.
|
|
*/
|
|
max_depth = depth;
|
|
if (entry->delta_child) {
|
|
max_depth -= check_delta_limit(entry, 0);
|
|
if (max_depth <= 0)
|
|
goto next;
|
|
}
|
|
|
|
j = window;
|
|
while (--j > 0) {
|
|
uint32_t other_idx = idx + j;
|
|
struct unpacked *m;
|
|
if (other_idx >= window)
|
|
other_idx -= window;
|
|
m = array + other_idx;
|
|
if (!m->entry)
|
|
break;
|
|
if (try_delta(n, m, max_depth) < 0)
|
|
break;
|
|
}
|
|
|
|
/* if we made n a delta, and if n is already at max
|
|
* depth, leaving it in the window is pointless. we
|
|
* should evict it first.
|
|
*/
|
|
if (entry->delta && depth <= n->depth)
|
|
continue;
|
|
|
|
next:
|
|
idx++;
|
|
if (count + 1 < window)
|
|
count++;
|
|
if (idx >= window)
|
|
idx = 0;
|
|
} while (i > 0);
|
|
|
|
if (progress)
|
|
stop_progress(&progress_state);
|
|
|
|
for (i = 0; i < window; ++i) {
|
|
free_delta_index(array[i].index);
|
|
free(array[i].data);
|
|
}
|
|
free(array);
|
|
}
|
|
|
|
static void prepare_pack(int window, int depth)
|
|
{
|
|
struct object_entry **delta_list;
|
|
uint32_t i;
|
|
|
|
get_object_details();
|
|
|
|
if (!window || !depth)
|
|
return;
|
|
|
|
delta_list = xmalloc(nr_objects * sizeof(*delta_list));
|
|
for (i = 0; i < nr_objects; i++)
|
|
delta_list[i] = objects + i;
|
|
qsort(delta_list, nr_objects, sizeof(*delta_list), type_size_sort);
|
|
find_deltas(delta_list, window+1, depth);
|
|
free(delta_list);
|
|
}
|
|
|
|
static int git_pack_config(const char *k, const char *v)
|
|
{
|
|
if(!strcmp(k, "pack.window")) {
|
|
window = git_config_int(k, v);
|
|
return 0;
|
|
}
|
|
if (!strcmp(k, "pack.windowmemory")) {
|
|
window_memory_limit = git_config_ulong(k, v);
|
|
return 0;
|
|
}
|
|
if (!strcmp(k, "pack.depth")) {
|
|
depth = git_config_int(k, v);
|
|
return 0;
|
|
}
|
|
if (!strcmp(k, "pack.compression")) {
|
|
int level = git_config_int(k, v);
|
|
if (level == -1)
|
|
level = Z_DEFAULT_COMPRESSION;
|
|
else if (level < 0 || level > Z_BEST_COMPRESSION)
|
|
die("bad pack compression level %d", level);
|
|
pack_compression_level = level;
|
|
pack_compression_seen = 1;
|
|
return 0;
|
|
}
|
|
if (!strcmp(k, "pack.deltacachesize")) {
|
|
max_delta_cache_size = git_config_int(k, v);
|
|
return 0;
|
|
}
|
|
if (!strcmp(k, "pack.deltacachelimit")) {
|
|
cache_max_small_delta_size = git_config_int(k, v);
|
|
return 0;
|
|
}
|
|
return git_default_config(k, v);
|
|
}
|
|
|
|
static void read_object_list_from_stdin(void)
|
|
{
|
|
char line[40 + 1 + PATH_MAX + 2];
|
|
unsigned char sha1[20];
|
|
|
|
for (;;) {
|
|
if (!fgets(line, sizeof(line), stdin)) {
|
|
if (feof(stdin))
|
|
break;
|
|
if (!ferror(stdin))
|
|
die("fgets returned NULL, not EOF, not error!");
|
|
if (errno != EINTR)
|
|
die("fgets: %s", strerror(errno));
|
|
clearerr(stdin);
|
|
continue;
|
|
}
|
|
if (line[0] == '-') {
|
|
if (get_sha1_hex(line+1, sha1))
|
|
die("expected edge sha1, got garbage:\n %s",
|
|
line);
|
|
add_preferred_base(sha1);
|
|
continue;
|
|
}
|
|
if (get_sha1_hex(line, sha1))
|
|
die("expected sha1, got garbage:\n %s", line);
|
|
|
|
add_preferred_base_object(line+41);
|
|
add_object_entry(sha1, 0, line+41, 0);
|
|
}
|
|
}
|
|
|
|
static void show_commit(struct commit *commit)
|
|
{
|
|
add_object_entry(commit->object.sha1, OBJ_COMMIT, NULL, 0);
|
|
}
|
|
|
|
static void show_object(struct object_array_entry *p)
|
|
{
|
|
add_preferred_base_object(p->name);
|
|
add_object_entry(p->item->sha1, p->item->type, p->name, 0);
|
|
}
|
|
|
|
static void show_edge(struct commit *commit)
|
|
{
|
|
add_preferred_base(commit->object.sha1);
|
|
}
|
|
|
|
static void get_object_list(int ac, const char **av)
|
|
{
|
|
struct rev_info revs;
|
|
char line[1000];
|
|
int flags = 0;
|
|
|
|
init_revisions(&revs, NULL);
|
|
save_commit_buffer = 0;
|
|
track_object_refs = 0;
|
|
setup_revisions(ac, av, &revs, NULL);
|
|
|
|
while (fgets(line, sizeof(line), stdin) != NULL) {
|
|
int len = strlen(line);
|
|
if (line[len - 1] == '\n')
|
|
line[--len] = 0;
|
|
if (!len)
|
|
break;
|
|
if (*line == '-') {
|
|
if (!strcmp(line, "--not")) {
|
|
flags ^= UNINTERESTING;
|
|
continue;
|
|
}
|
|
die("not a rev '%s'", line);
|
|
}
|
|
if (handle_revision_arg(line, &revs, flags, 1))
|
|
die("bad revision '%s'", line);
|
|
}
|
|
|
|
prepare_revision_walk(&revs);
|
|
mark_edges_uninteresting(revs.commits, &revs, show_edge);
|
|
traverse_commit_list(&revs, show_commit, show_object);
|
|
}
|
|
|
|
static int adjust_perm(const char *path, mode_t mode)
|
|
{
|
|
if (chmod(path, mode))
|
|
return -1;
|
|
return adjust_shared_perm(path);
|
|
}
|
|
|
|
int cmd_pack_objects(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int use_internal_rev_list = 0;
|
|
int thin = 0;
|
|
uint32_t i;
|
|
const char **rp_av;
|
|
int rp_ac_alloc = 64;
|
|
int rp_ac;
|
|
|
|
rp_av = xcalloc(rp_ac_alloc, sizeof(*rp_av));
|
|
|
|
rp_av[0] = "pack-objects";
|
|
rp_av[1] = "--objects"; /* --thin will make it --objects-edge */
|
|
rp_ac = 2;
|
|
|
|
git_config(git_pack_config);
|
|
if (!pack_compression_seen && core_compression_seen)
|
|
pack_compression_level = core_compression_level;
|
|
|
|
progress = isatty(2);
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
|
|
if (*arg != '-')
|
|
break;
|
|
|
|
if (!strcmp("--non-empty", arg)) {
|
|
non_empty = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--local", arg)) {
|
|
local = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--incremental", arg)) {
|
|
incremental = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--compression=")) {
|
|
char *end;
|
|
int level = strtoul(arg+14, &end, 0);
|
|
if (!arg[14] || *end)
|
|
usage(pack_usage);
|
|
if (level == -1)
|
|
level = Z_DEFAULT_COMPRESSION;
|
|
else if (level < 0 || level > Z_BEST_COMPRESSION)
|
|
die("bad pack compression level %d", level);
|
|
pack_compression_level = level;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--max-pack-size=")) {
|
|
char *end;
|
|
pack_size_limit = strtoul(arg+16, &end, 0) * 1024 * 1024;
|
|
if (!arg[16] || *end)
|
|
usage(pack_usage);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--window=")) {
|
|
char *end;
|
|
window = strtoul(arg+9, &end, 0);
|
|
if (!arg[9] || *end)
|
|
usage(pack_usage);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--window-memory=")) {
|
|
if (!git_parse_ulong(arg+16, &window_memory_limit))
|
|
usage(pack_usage);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--depth=")) {
|
|
char *end;
|
|
depth = strtoul(arg+8, &end, 0);
|
|
if (!arg[8] || *end)
|
|
usage(pack_usage);
|
|
continue;
|
|
}
|
|
if (!strcmp("--progress", arg)) {
|
|
progress = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--all-progress", arg)) {
|
|
progress = 2;
|
|
continue;
|
|
}
|
|
if (!strcmp("-q", arg)) {
|
|
progress = 0;
|
|
continue;
|
|
}
|
|
if (!strcmp("--no-reuse-delta", arg)) {
|
|
no_reuse_delta = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--no-reuse-object", arg)) {
|
|
no_reuse_object = no_reuse_delta = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--delta-base-offset", arg)) {
|
|
allow_ofs_delta = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--stdout", arg)) {
|
|
pack_to_stdout = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--revs", arg)) {
|
|
use_internal_rev_list = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--unpacked", arg) ||
|
|
!prefixcmp(arg, "--unpacked=") ||
|
|
!strcmp("--reflog", arg) ||
|
|
!strcmp("--all", arg)) {
|
|
use_internal_rev_list = 1;
|
|
if (rp_ac >= rp_ac_alloc - 1) {
|
|
rp_ac_alloc = alloc_nr(rp_ac_alloc);
|
|
rp_av = xrealloc(rp_av,
|
|
rp_ac_alloc * sizeof(*rp_av));
|
|
}
|
|
rp_av[rp_ac++] = arg;
|
|
continue;
|
|
}
|
|
if (!strcmp("--thin", arg)) {
|
|
use_internal_rev_list = 1;
|
|
thin = 1;
|
|
rp_av[1] = "--objects-edge";
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--index-version=")) {
|
|
char *c;
|
|
pack_idx_default_version = strtoul(arg + 16, &c, 10);
|
|
if (pack_idx_default_version > 2)
|
|
die("bad %s", arg);
|
|
if (*c == ',')
|
|
pack_idx_off32_limit = strtoul(c+1, &c, 0);
|
|
if (*c || pack_idx_off32_limit & 0x80000000)
|
|
die("bad %s", arg);
|
|
continue;
|
|
}
|
|
usage(pack_usage);
|
|
}
|
|
|
|
/* Traditionally "pack-objects [options] base extra" failed;
|
|
* we would however want to take refs parameter that would
|
|
* have been given to upstream rev-list ourselves, which means
|
|
* we somehow want to say what the base name is. So the
|
|
* syntax would be:
|
|
*
|
|
* pack-objects [options] base <refs...>
|
|
*
|
|
* in other words, we would treat the first non-option as the
|
|
* base_name and send everything else to the internal revision
|
|
* walker.
|
|
*/
|
|
|
|
if (!pack_to_stdout)
|
|
base_name = argv[i++];
|
|
|
|
if (pack_to_stdout != !base_name)
|
|
usage(pack_usage);
|
|
|
|
if (pack_to_stdout && pack_size_limit)
|
|
die("--max-pack-size cannot be used to build a pack for transfer.");
|
|
|
|
if (!pack_to_stdout && thin)
|
|
die("--thin cannot be used to build an indexable pack.");
|
|
|
|
prepare_packed_git();
|
|
|
|
if (progress)
|
|
start_progress(&progress_state, "Generating pack...",
|
|
"Counting objects: ", 0);
|
|
if (!use_internal_rev_list)
|
|
read_object_list_from_stdin();
|
|
else {
|
|
rp_av[rp_ac] = NULL;
|
|
get_object_list(rp_ac, rp_av);
|
|
}
|
|
if (progress) {
|
|
stop_progress(&progress_state);
|
|
fprintf(stderr, "Done counting %u objects.\n", nr_objects);
|
|
}
|
|
|
|
if (non_empty && !nr_result)
|
|
return 0;
|
|
if (progress && (nr_objects != nr_result))
|
|
fprintf(stderr, "Result has %u objects.\n", nr_result);
|
|
if (nr_result)
|
|
prepare_pack(window, depth);
|
|
write_pack_file();
|
|
if (progress)
|
|
fprintf(stderr, "Total %u (delta %u), reused %u (delta %u)\n",
|
|
written, written_delta, reused, reused_delta);
|
|
return 0;
|
|
}
|