mirror of
https://github.com/git/git.git
synced 2024-11-18 06:03:53 +01:00
599065a3bb
Previous step converted use of strncmp() with literal string
mechanically even when the result is only used as a boolean:
if (!strncmp("foo", arg, 3)) ==> if (!(-prefixcmp(arg, "foo")))
This step manually cleans them up to read:
if (!prefixcmp(arg, "foo"))
Signed-off-by: Junio C Hamano <junkio@cox.net>
1718 lines
42 KiB
C
1718 lines
42 KiB
C
#include "builtin.h"
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#include "cache.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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static const char pack_usage[] = "\
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git-pack-objects [{ -q | --progress | --all-progress }] \n\
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[--local] [--incremental] [--window=N] [--depth=N] \n\
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[--no-reuse-delta] [--delta-base-offset] [--non-empty] \n\
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[--revs [--unpacked | --all]*] [--reflog] [--stdout | base-name] \n\
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[<ref-list | <object-list]";
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struct object_entry {
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unsigned char sha1[20];
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unsigned long size; /* uncompressed size */
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unsigned long offset; /* offset into the final pack file;
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* nonzero if already written.
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*/
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unsigned int depth; /* delta depth */
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unsigned int delta_limit; /* base adjustment for in-pack delta */
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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 long delta_size; /* delta data size (uncompressed) */
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#define in_pack_header_size delta_size /* only when reusing pack data */
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struct object_entry *delta; /* delta base object */
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struct packed_git *in_pack; /* already in pack */
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unsigned int in_pack_offset;
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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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int preferred_base; /* we do not pack this, but is encouraged to
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* be used as the base objectto delta huge
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* objects against.
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*/
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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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* sorted-by-sha ans sorted-by-type are arrays of pointers that point at
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* elements in the objects array. The former is used to build the pack
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* index (lists object names in the ascending order to help offset lookup),
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* and the latter is used to group similar things together by try_delta()
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* heuristics.
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*/
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static unsigned char object_list_sha1[20];
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static int non_empty;
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static int no_reuse_delta;
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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 struct object_entry **sorted_by_sha, **sorted_by_type;
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static struct object_entry *objects;
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static int nr_objects, nr_alloc, nr_result;
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static const char *base_name;
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static unsigned char pack_file_sha1[20];
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static int progress = 1;
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static volatile sig_atomic_t progress_update;
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static int window = 10;
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static int pack_to_stdout;
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static int num_preferred_base;
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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. Binary search from
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* sorted_by_sha is also possible but this was easier to code and faster.
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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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unsigned int 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 int written;
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static int written_delta;
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static int reused;
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static int 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 = num_packed_objects(p);
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int i;
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void *index = p->index_base + 256;
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rix->revindex = xmalloc(sizeof(*rix->revindex) * (num_ent + 1));
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for (i = 0; i < num_ent; i++) {
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unsigned int hl = *((unsigned int *)((char *) 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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/* 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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unsigned int 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 = num_packed_objects(p) + 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 unsigned long find_packed_object_size(struct packed_git *p,
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unsigned long ofs)
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{
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struct revindex_entry *entry = find_packed_object(p, ofs);
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return entry[1].offset - ofs;
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}
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static unsigned char *find_packed_object_name(struct packed_git *p,
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unsigned long ofs)
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{
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struct revindex_entry *entry = find_packed_object(p, ofs);
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return (unsigned char *)(p->index_base + 256) + 24 * entry->nr + 4;
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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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char type[10];
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void *otherbuf = read_sha1_file(entry->delta->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->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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unsigned long offset,
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unsigned long 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 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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unsigned long offset,
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unsigned long 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 = 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 int check_loose_inflate(unsigned char *data, unsigned long len, unsigned long expect)
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{
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z_stream stream;
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unsigned char fakebuf[4096];
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int st;
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memset(&stream, 0, sizeof(stream));
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stream.next_in = data;
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stream.avail_in = len;
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stream.next_out = fakebuf;
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stream.avail_out = sizeof(fakebuf);
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inflateInit(&stream);
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while (1) {
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st = inflate(&stream, Z_FINISH);
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if (st == Z_STREAM_END || st == Z_OK) {
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st = (stream.total_out == expect &&
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stream.total_in == len) ? 0 : -1;
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break;
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}
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if (st != Z_BUF_ERROR) {
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st = -1;
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break;
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}
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stream.next_out = fakebuf;
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stream.avail_out = sizeof(fakebuf);
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}
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inflateEnd(&stream);
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return st;
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}
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static int revalidate_loose_object(struct object_entry *entry,
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unsigned char *map,
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unsigned long mapsize)
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{
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/* we already know this is a loose object with new type header. */
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enum object_type type;
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unsigned long size, used;
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if (pack_to_stdout)
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return 0;
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used = unpack_object_header_gently(map, mapsize, &type, &size);
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if (!used)
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return -1;
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map += used;
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mapsize -= used;
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return check_loose_inflate(map, mapsize, size);
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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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{
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unsigned long size;
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char type[10];
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void *buf;
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unsigned char header[10];
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unsigned hdrlen, datalen;
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enum object_type obj_type;
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int to_reuse = 0;
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obj_type = entry->type;
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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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to_reuse = 1; /* check_object() decided it for us */
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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 (!entry->in_pack && !entry->delta) {
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unsigned char *map;
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unsigned long mapsize;
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map = map_sha1_file(entry->sha1, &mapsize);
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if (map && !legacy_loose_object(map)) {
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/* We can copy straight into the pack file */
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if (revalidate_loose_object(entry, map, mapsize))
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die("corrupt loose object %s",
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sha1_to_hex(entry->sha1));
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sha1write(f, map, mapsize);
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munmap(map, mapsize);
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written++;
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reused++;
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return mapsize;
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}
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if (map)
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munmap(map, mapsize);
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}
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if (!to_reuse) {
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buf = read_sha1_file(entry->sha1, type, &size);
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if (!buf)
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die("unable to read %s", sha1_to_hex(entry->sha1));
|
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if (size != entry->size)
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die("object %s size inconsistency (%lu vs %lu)",
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sha1_to_hex(entry->sha1), size, entry->size);
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if (entry->delta) {
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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->offset) ?
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OBJ_OFS_DELTA : OBJ_REF_DELTA;
|
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}
|
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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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sha1write(f, header, hdrlen);
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|
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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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unsigned long ofs = entry->offset - entry->delta->offset;
|
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unsigned pos = sizeof(header) - 1;
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header[pos] = ofs & 127;
|
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while (ofs >>= 7)
|
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header[--pos] = 128 | (--ofs & 127);
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sha1write(f, header + pos, sizeof(header) - pos);
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hdrlen += sizeof(header) - 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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sha1write(f, entry->delta->sha1, 20);
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hdrlen += 20;
|
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}
|
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datalen = sha1write_compressed(f, buf, size);
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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;
|
|
unsigned long offset;
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|
|
|
if (entry->delta) {
|
|
obj_type = (allow_ofs_delta && entry->delta->offset) ?
|
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OBJ_OFS_DELTA : OBJ_REF_DELTA;
|
|
reused_delta++;
|
|
}
|
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hdrlen = encode_header(obj_type, entry->size, header);
|
|
sha1write(f, header, hdrlen);
|
|
if (obj_type == OBJ_OFS_DELTA) {
|
|
unsigned long ofs = entry->offset - entry->delta->offset;
|
|
unsigned pos = sizeof(header) - 1;
|
|
header[pos] = ofs & 127;
|
|
while (ofs >>= 7)
|
|
header[--pos] = 128 | (--ofs & 127);
|
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sha1write(f, header + pos, sizeof(header) - pos);
|
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hdrlen += sizeof(header) - pos;
|
|
} else if (obj_type == OBJ_REF_DELTA) {
|
|
sha1write(f, entry->delta->sha1, 20);
|
|
hdrlen += 20;
|
|
}
|
|
|
|
offset = entry->in_pack_offset + entry->in_pack_header_size;
|
|
datalen = find_packed_object_size(p, entry->in_pack_offset)
|
|
- entry->in_pack_header_size;
|
|
if (!pack_to_stdout && check_pack_inflate(p, &w_curs,
|
|
offset, datalen, entry->size))
|
|
die("corrupt delta in pack %s", sha1_to_hex(entry->sha1));
|
|
copy_pack_data(f, p, &w_curs, offset, datalen);
|
|
unuse_pack(&w_curs);
|
|
reused++;
|
|
}
|
|
if (entry->delta)
|
|
written_delta++;
|
|
written++;
|
|
return hdrlen + datalen;
|
|
}
|
|
|
|
static unsigned long write_one(struct sha1file *f,
|
|
struct object_entry *e,
|
|
unsigned long offset)
|
|
{
|
|
if (e->offset || e->preferred_base)
|
|
/* offset starts from header size and cannot be zero
|
|
* if it is written already.
|
|
*/
|
|
return offset;
|
|
/* if we are deltified, write out its base object first. */
|
|
if (e->delta)
|
|
offset = write_one(f, e->delta, offset);
|
|
e->offset = offset;
|
|
return offset + write_object(f, e);
|
|
}
|
|
|
|
static void write_pack_file(void)
|
|
{
|
|
int i;
|
|
struct sha1file *f;
|
|
unsigned long offset;
|
|
struct pack_header hdr;
|
|
unsigned last_percent = 999;
|
|
int do_progress = progress;
|
|
|
|
if (!base_name) {
|
|
f = sha1fd(1, "<stdout>");
|
|
do_progress >>= 1;
|
|
}
|
|
else
|
|
f = sha1create("%s-%s.%s", base_name,
|
|
sha1_to_hex(object_list_sha1), "pack");
|
|
if (do_progress)
|
|
fprintf(stderr, "Writing %d objects.\n", nr_result);
|
|
|
|
hdr.hdr_signature = htonl(PACK_SIGNATURE);
|
|
hdr.hdr_version = htonl(PACK_VERSION);
|
|
hdr.hdr_entries = htonl(nr_result);
|
|
sha1write(f, &hdr, sizeof(hdr));
|
|
offset = sizeof(hdr);
|
|
if (!nr_result)
|
|
goto done;
|
|
for (i = 0; i < nr_objects; i++) {
|
|
offset = write_one(f, objects + i, offset);
|
|
if (do_progress) {
|
|
unsigned percent = written * 100 / nr_result;
|
|
if (progress_update || percent != last_percent) {
|
|
fprintf(stderr, "%4u%% (%u/%u) done\r",
|
|
percent, written, nr_result);
|
|
progress_update = 0;
|
|
last_percent = percent;
|
|
}
|
|
}
|
|
}
|
|
if (do_progress)
|
|
fputc('\n', stderr);
|
|
done:
|
|
if (written != nr_result)
|
|
die("wrote %d objects while expecting %d", written, nr_result);
|
|
sha1close(f, pack_file_sha1, 1);
|
|
}
|
|
|
|
static void write_index_file(void)
|
|
{
|
|
int i;
|
|
struct sha1file *f = sha1create("%s-%s.%s", base_name,
|
|
sha1_to_hex(object_list_sha1), "idx");
|
|
struct object_entry **list = sorted_by_sha;
|
|
struct object_entry **last = list + nr_result;
|
|
uint32_t array[256];
|
|
|
|
/*
|
|
* Write the first-level table (the list is sorted,
|
|
* but we use a 256-entry lookup to be able to avoid
|
|
* having to do eight extra binary search iterations).
|
|
*/
|
|
for (i = 0; i < 256; i++) {
|
|
struct object_entry **next = list;
|
|
while (next < last) {
|
|
struct object_entry *entry = *next;
|
|
if (entry->sha1[0] != i)
|
|
break;
|
|
next++;
|
|
}
|
|
array[i] = htonl(next - sorted_by_sha);
|
|
list = next;
|
|
}
|
|
sha1write(f, array, 256 * 4);
|
|
|
|
/*
|
|
* Write the actual SHA1 entries..
|
|
*/
|
|
list = sorted_by_sha;
|
|
for (i = 0; i < nr_result; i++) {
|
|
struct object_entry *entry = *list++;
|
|
uint32_t offset = htonl(entry->offset);
|
|
sha1write(f, &offset, 4);
|
|
sha1write(f, entry->sha1, 20);
|
|
}
|
|
sha1write(f, pack_file_sha1, 20);
|
|
sha1close(f, NULL, 1);
|
|
}
|
|
|
|
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].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)
|
|
{
|
|
int 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->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;
|
|
|
|
/*
|
|
* 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 int add_object_entry(const unsigned char *sha1, unsigned hash, int exclude)
|
|
{
|
|
unsigned int idx = nr_objects;
|
|
struct object_entry *entry;
|
|
struct packed_git *p;
|
|
unsigned int found_offset = 0;
|
|
struct packed_git *found_pack = NULL;
|
|
int ix, status = 0;
|
|
|
|
if (!exclude) {
|
|
for (p = packed_git; p; p = p->next) {
|
|
unsigned long offset = find_pack_entry_one(sha1, p);
|
|
if (offset) {
|
|
if (incremental)
|
|
return 0;
|
|
if (local && !p->pack_local)
|
|
return 0;
|
|
if (!found_pack) {
|
|
found_offset = offset;
|
|
found_pack = p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if ((entry = locate_object_entry(sha1)) != NULL)
|
|
goto already_added;
|
|
|
|
if (idx >= nr_alloc) {
|
|
unsigned int needed = (idx + 1024) * 3 / 2;
|
|
objects = xrealloc(objects, needed * sizeof(*entry));
|
|
nr_alloc = needed;
|
|
}
|
|
entry = objects + idx;
|
|
nr_objects = idx + 1;
|
|
memset(entry, 0, sizeof(*entry));
|
|
hashcpy(entry->sha1, sha1);
|
|
entry->hash = hash;
|
|
|
|
if (object_ix_hashsz * 3 <= nr_objects * 4)
|
|
rehash_objects();
|
|
else {
|
|
ix = locate_object_entry_hash(entry->sha1);
|
|
if (0 <= ix)
|
|
die("internal error in object hashing.");
|
|
object_ix[-1 - ix] = idx + 1;
|
|
}
|
|
status = 1;
|
|
|
|
already_added:
|
|
if (progress_update) {
|
|
fprintf(stderr, "Counting objects...%d\r", nr_objects);
|
|
progress_update = 0;
|
|
}
|
|
if (exclude)
|
|
entry->preferred_base = 1;
|
|
else {
|
|
if (found_pack) {
|
|
entry->in_pack = found_pack;
|
|
entry->in_pack_offset = found_offset;
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
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;
|
|
char type[20];
|
|
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 (strcmp(type, tree_type)) {
|
|
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;
|
|
|
|
while (tree_entry(tree,&entry)) {
|
|
unsigned long size;
|
|
char type[20];
|
|
|
|
if (entry.pathlen != cmplen ||
|
|
memcmp(entry.path, name, cmplen) ||
|
|
!has_sha1_file(entry.sha1) ||
|
|
sha1_object_info(entry.sha1, type, &size))
|
|
continue;
|
|
if (name[cmplen] != '/') {
|
|
unsigned hash = name_hash(fullname);
|
|
add_object_entry(entry.sha1, hash, 1);
|
|
return;
|
|
}
|
|
if (!strcmp(type, tree_type)) {
|
|
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;
|
|
sub.buf = tree->tree_data;
|
|
sub.size = 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, unsigned hash)
|
|
{
|
|
struct pbase_tree *it;
|
|
int cmplen = name_cmp_len(name);
|
|
|
|
if (check_pbase_path(hash))
|
|
return;
|
|
|
|
for (it = pbase_tree; it; it = it->next) {
|
|
if (cmplen == 0) {
|
|
hash = name_hash("");
|
|
add_object_entry(it->pcache.sha1, hash, 1);
|
|
}
|
|
else {
|
|
struct tree_desc tree;
|
|
tree.buf = it->pcache.tree_data;
|
|
tree.size = 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)
|
|
{
|
|
char type[20];
|
|
|
|
if (entry->in_pack && !entry->preferred_base) {
|
|
struct packed_git *p = entry->in_pack;
|
|
struct pack_window *w_curs = NULL;
|
|
unsigned long left = p->pack_size - entry->in_pack_offset;
|
|
unsigned long size, used;
|
|
unsigned char *buf;
|
|
struct object_entry *base_entry = NULL;
|
|
|
|
buf = use_pack(p, &w_curs, entry->in_pack_offset, NULL);
|
|
|
|
/* We want in_pack_type even if we do not reuse delta.
|
|
* There is no point not reusing non-delta representations.
|
|
*/
|
|
used = unpack_object_header_gently(buf, left,
|
|
&entry->in_pack_type, &size);
|
|
|
|
/* Check if it is delta, and the base is also an object
|
|
* we are going to pack. If so we will reuse the existing
|
|
* delta.
|
|
*/
|
|
if (!no_reuse_delta) {
|
|
unsigned char c, *base_name;
|
|
unsigned long ofs;
|
|
unsigned long used_0;
|
|
/* there is at least 20 bytes left in the pack */
|
|
switch (entry->in_pack_type) {
|
|
case OBJ_REF_DELTA:
|
|
base_name = use_pack(p, &w_curs,
|
|
entry->in_pack_offset + used, NULL);
|
|
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 || ofs & ~(~0UL >> 7))
|
|
die("delta base offset overflow in pack for %s",
|
|
sha1_to_hex(entry->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->sha1));
|
|
ofs = entry->in_pack_offset - ofs;
|
|
base_name = find_packed_object_name(p, ofs);
|
|
used += used_0;
|
|
break;
|
|
default:
|
|
base_name = NULL;
|
|
}
|
|
if (base_name)
|
|
base_entry = locate_object_entry(base_name);
|
|
}
|
|
unuse_pack(&w_curs);
|
|
entry->in_pack_header_size = used;
|
|
|
|
if (base_entry) {
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
/* uncompressed size of the delta data */
|
|
entry->size = size;
|
|
entry->delta = base_entry;
|
|
entry->type = entry->in_pack_type;
|
|
|
|
entry->delta_sibling = base_entry->delta_child;
|
|
base_entry->delta_child = entry;
|
|
|
|
return;
|
|
}
|
|
/* Otherwise we would do the usual */
|
|
}
|
|
|
|
if (sha1_object_info(entry->sha1, type, &entry->size))
|
|
die("unable to get type of object %s",
|
|
sha1_to_hex(entry->sha1));
|
|
|
|
if (!strcmp(type, commit_type)) {
|
|
entry->type = OBJ_COMMIT;
|
|
} else if (!strcmp(type, tree_type)) {
|
|
entry->type = OBJ_TREE;
|
|
} else if (!strcmp(type, blob_type)) {
|
|
entry->type = OBJ_BLOB;
|
|
} else if (!strcmp(type, tag_type)) {
|
|
entry->type = OBJ_TAG;
|
|
} else
|
|
die("unable to pack object %s of type %s",
|
|
sha1_to_hex(entry->sha1), type);
|
|
}
|
|
|
|
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 get_object_details(void)
|
|
{
|
|
int i;
|
|
struct object_entry *entry;
|
|
|
|
prepare_pack_ix();
|
|
for (i = 0, entry = objects; i < nr_objects; i++, entry++)
|
|
check_object(entry);
|
|
|
|
if (nr_objects == nr_result) {
|
|
/*
|
|
* Depth of objects that depend on the entry -- this
|
|
* is subtracted from depth-max to break too deep
|
|
* delta chain because of delta data reusing.
|
|
* However, we loosen this restriction when we know we
|
|
* are creating a thin pack -- it will have to be
|
|
* expanded on the other end anyway, so do not
|
|
* artificially cut the delta chain and let it go as
|
|
* deep as it wants.
|
|
*/
|
|
for (i = 0, entry = objects; i < nr_objects; i++, entry++)
|
|
if (!entry->delta && entry->delta_child)
|
|
entry->delta_limit =
|
|
check_delta_limit(entry, 1);
|
|
}
|
|
}
|
|
|
|
typedef int (*entry_sort_t)(const struct object_entry *, const struct object_entry *);
|
|
|
|
static entry_sort_t current_sort;
|
|
|
|
static int sort_comparator(const void *_a, const void *_b)
|
|
{
|
|
struct object_entry *a = *(struct object_entry **)_a;
|
|
struct object_entry *b = *(struct object_entry **)_b;
|
|
return current_sort(a,b);
|
|
}
|
|
|
|
static struct object_entry **create_sorted_list(entry_sort_t sort)
|
|
{
|
|
struct object_entry **list = xmalloc(nr_objects * sizeof(struct object_entry *));
|
|
int i;
|
|
|
|
for (i = 0; i < nr_objects; i++)
|
|
list[i] = objects + i;
|
|
current_sort = sort;
|
|
qsort(list, nr_objects, sizeof(struct object_entry *), sort_comparator);
|
|
return list;
|
|
}
|
|
|
|
static int sha1_sort(const struct object_entry *a, const struct object_entry *b)
|
|
{
|
|
return hashcmp(a->sha1, b->sha1);
|
|
}
|
|
|
|
static struct object_entry **create_final_object_list(void)
|
|
{
|
|
struct object_entry **list;
|
|
int i, j;
|
|
|
|
for (i = nr_result = 0; i < nr_objects; i++)
|
|
if (!objects[i].preferred_base)
|
|
nr_result++;
|
|
list = xmalloc(nr_result * sizeof(struct object_entry *));
|
|
for (i = j = 0; i < nr_objects; i++) {
|
|
if (!objects[i].preferred_base)
|
|
list[j++] = objects + i;
|
|
}
|
|
current_sort = sha1_sort;
|
|
qsort(list, nr_result, sizeof(struct object_entry *), sort_comparator);
|
|
return list;
|
|
}
|
|
|
|
static int type_size_sort(const struct object_entry *a, const 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);
|
|
}
|
|
|
|
struct unpacked {
|
|
struct object_entry *entry;
|
|
void *data;
|
|
struct delta_index *index;
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
char type[10];
|
|
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;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (trg_entry->delta_child) {
|
|
if (max_depth <= trg_entry->delta_limit)
|
|
return 0;
|
|
max_depth -= trg_entry->delta_limit;
|
|
}
|
|
if (src_entry->depth >= max_depth)
|
|
return 0;
|
|
|
|
/* Now some size filtering heuristics. */
|
|
trg_size = trg_entry->size;
|
|
max_size = trg_size/2 - 20;
|
|
max_size = max_size * (max_depth - src_entry->depth) / max_depth;
|
|
if (max_size == 0)
|
|
return 0;
|
|
if (trg_entry->delta && trg_entry->delta_size <= max_size)
|
|
max_size = trg_entry->delta_size-1;
|
|
src_size = src_entry->size;
|
|
sizediff = src_size < trg_size ? trg_size - src_size : 0;
|
|
if (sizediff >= max_size)
|
|
return 0;
|
|
|
|
/* Load data if not already done */
|
|
if (!trg->data) {
|
|
trg->data = read_sha1_file(trg_entry->sha1, type, &sz);
|
|
if (sz != trg_size)
|
|
die("object %s inconsistent object length (%lu vs %lu)",
|
|
sha1_to_hex(trg_entry->sha1), sz, trg_size);
|
|
}
|
|
if (!src->data) {
|
|
src->data = read_sha1_file(src_entry->sha1, type, &sz);
|
|
if (sz != src_size)
|
|
die("object %s inconsistent object length (%lu vs %lu)",
|
|
sha1_to_hex(src_entry->sha1), sz, src_size);
|
|
}
|
|
if (!src->index) {
|
|
src->index = create_delta_index(src->data, src_size);
|
|
if (!src->index)
|
|
die("out of memory");
|
|
}
|
|
|
|
delta_buf = create_delta(src->index, trg->data, trg_size, &delta_size, max_size);
|
|
if (!delta_buf)
|
|
return 0;
|
|
|
|
trg_entry->delta = src_entry;
|
|
trg_entry->delta_size = delta_size;
|
|
trg_entry->depth = src_entry->depth + 1;
|
|
free(delta_buf);
|
|
return 1;
|
|
}
|
|
|
|
static void progress_interval(int signum)
|
|
{
|
|
progress_update = 1;
|
|
}
|
|
|
|
static void find_deltas(struct object_entry **list, int window, int depth)
|
|
{
|
|
int i, idx;
|
|
unsigned int array_size = window * sizeof(struct unpacked);
|
|
struct unpacked *array = xmalloc(array_size);
|
|
unsigned processed = 0;
|
|
unsigned last_percent = 999;
|
|
|
|
memset(array, 0, array_size);
|
|
i = nr_objects;
|
|
idx = 0;
|
|
if (progress)
|
|
fprintf(stderr, "Deltifying %d objects.\n", nr_result);
|
|
|
|
while (--i >= 0) {
|
|
struct object_entry *entry = list[i];
|
|
struct unpacked *n = array + idx;
|
|
int j;
|
|
|
|
if (!entry->preferred_base)
|
|
processed++;
|
|
|
|
if (progress) {
|
|
unsigned percent = processed * 100 / nr_result;
|
|
if (percent != last_percent || progress_update) {
|
|
fprintf(stderr, "%4u%% (%u/%u) done\r",
|
|
percent, processed, nr_result);
|
|
progress_update = 0;
|
|
last_percent = percent;
|
|
}
|
|
}
|
|
|
|
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;
|
|
free_delta_index(n->index);
|
|
n->index = NULL;
|
|
free(n->data);
|
|
n->data = NULL;
|
|
n->entry = entry;
|
|
|
|
j = window;
|
|
while (--j > 0) {
|
|
unsigned int 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, 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 <= entry->depth)
|
|
continue;
|
|
|
|
idx++;
|
|
if (idx >= window)
|
|
idx = 0;
|
|
}
|
|
|
|
if (progress)
|
|
fputc('\n', stderr);
|
|
|
|
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)
|
|
{
|
|
get_object_details();
|
|
sorted_by_type = create_sorted_list(type_size_sort);
|
|
if (window && depth)
|
|
find_deltas(sorted_by_type, window+1, depth);
|
|
}
|
|
|
|
static int reuse_cached_pack(unsigned char *sha1)
|
|
{
|
|
static const char cache[] = "pack-cache/pack-%s.%s";
|
|
char *cached_pack, *cached_idx;
|
|
int ifd, ofd, ifd_ix = -1;
|
|
|
|
cached_pack = git_path(cache, sha1_to_hex(sha1), "pack");
|
|
ifd = open(cached_pack, O_RDONLY);
|
|
if (ifd < 0)
|
|
return 0;
|
|
|
|
if (!pack_to_stdout) {
|
|
cached_idx = git_path(cache, sha1_to_hex(sha1), "idx");
|
|
ifd_ix = open(cached_idx, O_RDONLY);
|
|
if (ifd_ix < 0) {
|
|
close(ifd);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (progress)
|
|
fprintf(stderr, "Reusing %d objects pack %s\n", nr_objects,
|
|
sha1_to_hex(sha1));
|
|
|
|
if (pack_to_stdout) {
|
|
if (copy_fd(ifd, 1))
|
|
exit(1);
|
|
close(ifd);
|
|
}
|
|
else {
|
|
char name[PATH_MAX];
|
|
snprintf(name, sizeof(name),
|
|
"%s-%s.%s", base_name, sha1_to_hex(sha1), "pack");
|
|
ofd = open(name, O_CREAT | O_EXCL | O_WRONLY, 0666);
|
|
if (ofd < 0)
|
|
die("unable to open %s (%s)", name, strerror(errno));
|
|
if (copy_fd(ifd, ofd))
|
|
exit(1);
|
|
close(ifd);
|
|
|
|
snprintf(name, sizeof(name),
|
|
"%s-%s.%s", base_name, sha1_to_hex(sha1), "idx");
|
|
ofd = open(name, O_CREAT | O_EXCL | O_WRONLY, 0666);
|
|
if (ofd < 0)
|
|
die("unable to open %s (%s)", name, strerror(errno));
|
|
if (copy_fd(ifd_ix, ofd))
|
|
exit(1);
|
|
close(ifd_ix);
|
|
puts(sha1_to_hex(sha1));
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void setup_progress_signal(void)
|
|
{
|
|
struct sigaction sa;
|
|
struct itimerval v;
|
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_handler = progress_interval;
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = SA_RESTART;
|
|
sigaction(SIGALRM, &sa, NULL);
|
|
|
|
v.it_interval.tv_sec = 1;
|
|
v.it_interval.tv_usec = 0;
|
|
v.it_value = v.it_interval;
|
|
setitimer(ITIMER_REAL, &v, NULL);
|
|
}
|
|
|
|
static int git_pack_config(const char *k, const char *v)
|
|
{
|
|
if(!strcmp(k, "pack.window")) {
|
|
window = 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];
|
|
unsigned hash;
|
|
|
|
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);
|
|
|
|
hash = name_hash(line+41);
|
|
add_preferred_base_object(line+41, hash);
|
|
add_object_entry(sha1, hash, 0);
|
|
}
|
|
}
|
|
|
|
static void show_commit(struct commit *commit)
|
|
{
|
|
unsigned hash = name_hash("");
|
|
add_preferred_base_object("", hash);
|
|
add_object_entry(commit->object.sha1, hash, 0);
|
|
}
|
|
|
|
static void show_object(struct object_array_entry *p)
|
|
{
|
|
unsigned hash = name_hash(p->name);
|
|
add_preferred_base_object(p->name, hash);
|
|
add_object_entry(p->item->sha1, hash, 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);
|
|
}
|
|
|
|
int cmd_pack_objects(int argc, const char **argv, const char *prefix)
|
|
{
|
|
SHA_CTX ctx;
|
|
int depth = 10;
|
|
struct object_entry **list;
|
|
int use_internal_rev_list = 0;
|
|
int thin = 0;
|
|
int i;
|
|
const char *rp_av[64];
|
|
int rp_ac;
|
|
|
|
rp_av[0] = "pack-objects";
|
|
rp_av[1] = "--objects"; /* --thin will make it --objects-edge */
|
|
rp_ac = 2;
|
|
|
|
git_config(git_pack_config);
|
|
|
|
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, "--window=")) {
|
|
char *end;
|
|
window = strtoul(arg+9, &end, 0);
|
|
if (!arg[9] || *end)
|
|
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("--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 (ARRAY_SIZE(rp_av) - 1 <= rp_ac)
|
|
die("too many internal rev-list options");
|
|
rp_av[rp_ac++] = arg;
|
|
continue;
|
|
}
|
|
if (!strcmp("--thin", arg)) {
|
|
use_internal_rev_list = 1;
|
|
thin = 1;
|
|
rp_av[1] = "--objects-edge";
|
|
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 && thin)
|
|
die("--thin cannot be used to build an indexable pack.");
|
|
|
|
prepare_packed_git();
|
|
|
|
if (progress) {
|
|
fprintf(stderr, "Generating pack...\n");
|
|
setup_progress_signal();
|
|
}
|
|
|
|
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)
|
|
fprintf(stderr, "Done counting %d objects.\n", nr_objects);
|
|
sorted_by_sha = create_final_object_list();
|
|
if (non_empty && !nr_result)
|
|
return 0;
|
|
|
|
SHA1_Init(&ctx);
|
|
list = sorted_by_sha;
|
|
for (i = 0; i < nr_result; i++) {
|
|
struct object_entry *entry = *list++;
|
|
SHA1_Update(&ctx, entry->sha1, 20);
|
|
}
|
|
SHA1_Final(object_list_sha1, &ctx);
|
|
if (progress && (nr_objects != nr_result))
|
|
fprintf(stderr, "Result has %d objects.\n", nr_result);
|
|
|
|
if (reuse_cached_pack(object_list_sha1))
|
|
;
|
|
else {
|
|
if (nr_result)
|
|
prepare_pack(window, depth);
|
|
if (progress == 1 && pack_to_stdout) {
|
|
/* the other end usually displays progress itself */
|
|
struct itimerval v = {{0,},};
|
|
setitimer(ITIMER_REAL, &v, NULL);
|
|
signal(SIGALRM, SIG_IGN );
|
|
progress_update = 0;
|
|
}
|
|
write_pack_file();
|
|
if (!pack_to_stdout) {
|
|
write_index_file();
|
|
puts(sha1_to_hex(object_list_sha1));
|
|
}
|
|
}
|
|
if (progress)
|
|
fprintf(stderr, "Total %d (delta %d), reused %d (delta %d)\n",
|
|
written, written_delta, reused, reused_delta);
|
|
return 0;
|
|
}
|