mirror of
https://github.com/git/git.git
synced 2024-11-18 06:03:53 +01:00
93822c2239
We have a number of badly checked write() calls. Often we are expecting write() to write exactly the size we requested or fail, this fails to handle interrupts or short writes. Switch to using the new write_in_full(). Otherwise we at a minimum need to check for EINTR and EAGAIN, where this is appropriate use xwrite(). Note, the changes to config handling are much larger and handled in the next patch in the sequence. Signed-off-by: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
422 lines
10 KiB
C
422 lines
10 KiB
C
#include "cache.h"
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#include "path-list.h"
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#include "xdiff/xdiff.h"
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#include "xdiff-interface.h"
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#include <time.h>
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static const char git_rerere_usage[] =
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"git-rerere [clear | status | diff | gc]";
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/* these values are days */
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static int cutoff_noresolve = 15;
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static int cutoff_resolve = 60;
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static char *merge_rr_path;
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static const char *rr_path(const char *name, const char *file)
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{
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return git_path("rr-cache/%s/%s", name, file);
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}
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static void read_rr(struct path_list *rr)
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{
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unsigned char sha1[20];
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char buf[PATH_MAX];
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FILE *in = fopen(merge_rr_path, "r");
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if (!in)
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return;
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while (fread(buf, 40, 1, in) == 1) {
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int i;
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char *name;
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if (get_sha1_hex(buf, sha1))
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die("corrupt MERGE_RR");
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buf[40] = '\0';
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name = xstrdup(buf);
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if (fgetc(in) != '\t')
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die("corrupt MERGE_RR");
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for (i = 0; i < sizeof(buf) && (buf[i] = fgetc(in)); i++)
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; /* do nothing */
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if (i == sizeof(buf))
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die("filename too long");
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path_list_insert(buf, rr)->util = xstrdup(name);
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}
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fclose(in);
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}
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static struct lock_file write_lock;
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static int write_rr(struct path_list *rr, int out_fd)
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{
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int i;
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for (i = 0; i < rr->nr; i++) {
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const char *path = rr->items[i].path;
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int length = strlen(path) + 1;
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if (write_in_full(out_fd, rr->items[i].util, 40) != 40 ||
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write_in_full(out_fd, "\t", 1) != 1 ||
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write_in_full(out_fd, path, length) != length)
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die("unable to write rerere record");
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}
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close(out_fd);
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return commit_lock_file(&write_lock);
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}
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struct buffer {
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char *ptr;
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int nr, alloc;
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};
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static void append_line(struct buffer *buffer, const char *line)
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{
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int len = strlen(line);
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if (buffer->nr + len > buffer->alloc) {
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buffer->alloc = alloc_nr(buffer->nr + len);
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buffer->ptr = xrealloc(buffer->ptr, buffer->alloc);
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}
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memcpy(buffer->ptr + buffer->nr, line, len);
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buffer->nr += len;
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}
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static int handle_file(const char *path,
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unsigned char *sha1, const char *output)
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{
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SHA_CTX ctx;
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char buf[1024];
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int hunk = 0, hunk_no = 0;
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struct buffer minus = { NULL, 0, 0 }, plus = { NULL, 0, 0 };
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struct buffer *one = &minus, *two = +
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FILE *f = fopen(path, "r");
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FILE *out;
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if (!f)
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return error("Could not open %s", path);
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if (output) {
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out = fopen(output, "w");
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if (!out) {
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fclose(f);
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return error("Could not write %s", output);
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}
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} else
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out = NULL;
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if (sha1)
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SHA1_Init(&ctx);
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while (fgets(buf, sizeof(buf), f)) {
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if (!strncmp("<<<<<<< ", buf, 8))
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hunk = 1;
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else if (!strncmp("=======", buf, 7))
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hunk = 2;
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else if (!strncmp(">>>>>>> ", buf, 8)) {
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hunk_no++;
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hunk = 0;
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if (memcmp(one->ptr, two->ptr, one->nr < two->nr ?
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one->nr : two->nr) > 0) {
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struct buffer *swap = one;
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one = two;
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two = swap;
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}
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if (out) {
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fputs("<<<<<<<\n", out);
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fwrite(one->ptr, one->nr, 1, out);
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fputs("=======\n", out);
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fwrite(two->ptr, two->nr, 1, out);
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fputs(">>>>>>>\n", out);
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}
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if (sha1) {
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SHA1_Update(&ctx, one->ptr, one->nr);
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SHA1_Update(&ctx, "\0", 1);
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SHA1_Update(&ctx, two->ptr, two->nr);
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SHA1_Update(&ctx, "\0", 1);
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}
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} else if (hunk == 1)
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append_line(one, buf);
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else if (hunk == 2)
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append_line(two, buf);
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else if (out)
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fputs(buf, out);
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}
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fclose(f);
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if (out)
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fclose(out);
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if (sha1)
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SHA1_Final(sha1, &ctx);
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return hunk_no;
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}
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static int find_conflict(struct path_list *conflict)
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{
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int i;
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if (read_cache() < 0)
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return error("Could not read index");
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for (i = 0; i + 2 < active_nr; i++) {
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struct cache_entry *e1 = active_cache[i];
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struct cache_entry *e2 = active_cache[i + 1];
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struct cache_entry *e3 = active_cache[i + 2];
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if (ce_stage(e1) == 1 && ce_stage(e2) == 2 &&
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ce_stage(e3) == 3 && ce_same_name(e1, e2) &&
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ce_same_name(e1, e3)) {
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path_list_insert((const char *)e1->name, conflict);
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i += 3;
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}
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}
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return 0;
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}
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static int merge(const char *name, const char *path)
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{
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int ret;
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mmfile_t cur, base, other;
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mmbuffer_t result = {NULL, 0};
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xpparam_t xpp = {XDF_NEED_MINIMAL};
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if (handle_file(path, NULL, rr_path(name, "thisimage")) < 0)
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return 1;
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if (read_mmfile(&cur, rr_path(name, "thisimage")) ||
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read_mmfile(&base, rr_path(name, "preimage")) ||
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read_mmfile(&other, rr_path(name, "postimage")))
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return 1;
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ret = xdl_merge(&base, &cur, "", &other, "",
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&xpp, XDL_MERGE_ZEALOUS, &result);
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if (!ret) {
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FILE *f = fopen(path, "w");
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if (!f)
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return error("Could not write to %s", path);
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fwrite(result.ptr, result.size, 1, f);
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fclose(f);
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}
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free(cur.ptr);
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free(base.ptr);
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free(other.ptr);
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free(result.ptr);
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return ret;
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}
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static void unlink_rr_item(const char *name)
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{
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unlink(rr_path(name, "thisimage"));
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unlink(rr_path(name, "preimage"));
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unlink(rr_path(name, "postimage"));
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rmdir(git_path("rr-cache/%s", name));
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}
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static void garbage_collect(struct path_list *rr)
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{
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struct path_list to_remove = { NULL, 0, 0, 1 };
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char buf[1024];
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DIR *dir;
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struct dirent *e;
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int len, i, cutoff;
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time_t now = time(NULL), then;
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strlcpy(buf, git_path("rr-cache"), sizeof(buf));
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len = strlen(buf);
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dir = opendir(buf);
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strcpy(buf + len++, "/");
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while ((e = readdir(dir))) {
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const char *name = e->d_name;
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struct stat st;
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if (name[0] == '.' && (name[1] == '\0' ||
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(name[1] == '.' && name[2] == '\0')))
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continue;
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i = snprintf(buf + len, sizeof(buf) - len, "%s", name);
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strlcpy(buf + len + i, "/preimage", sizeof(buf) - len - i);
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if (stat(buf, &st))
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continue;
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then = st.st_mtime;
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strlcpy(buf + len + i, "/postimage", sizeof(buf) - len - i);
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cutoff = stat(buf, &st) ? cutoff_noresolve : cutoff_resolve;
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if (then < now - cutoff * 86400) {
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buf[len + i] = '\0';
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path_list_insert(xstrdup(name), &to_remove);
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}
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}
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for (i = 0; i < to_remove.nr; i++)
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unlink_rr_item(to_remove.items[i].path);
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path_list_clear(&to_remove, 0);
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}
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static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
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{
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int i;
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for (i = 0; i < nbuf; i++)
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if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
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return -1;
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return 0;
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}
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static int diff_two(const char *file1, const char *label1,
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const char *file2, const char *label2)
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{
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xpparam_t xpp;
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xdemitconf_t xecfg;
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xdemitcb_t ecb;
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mmfile_t minus, plus;
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if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
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return 1;
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printf("--- a/%s\n+++ b/%s\n", label1, label2);
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fflush(stdout);
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xpp.flags = XDF_NEED_MINIMAL;
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xecfg.ctxlen = 3;
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xecfg.flags = 0;
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ecb.outf = outf;
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xdl_diff(&minus, &plus, &xpp, &xecfg, &ecb);
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free(minus.ptr);
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free(plus.ptr);
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return 0;
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}
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static int copy_file(const char *src, const char *dest)
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{
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FILE *in, *out;
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char buffer[32768];
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int count;
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if (!(in = fopen(src, "r")))
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return error("Could not open %s", src);
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if (!(out = fopen(dest, "w")))
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return error("Could not open %s", dest);
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while ((count = fread(buffer, 1, sizeof(buffer), in)))
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fwrite(buffer, 1, count, out);
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fclose(in);
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fclose(out);
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return 0;
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}
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static int do_plain_rerere(struct path_list *rr, int fd)
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{
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struct path_list conflict = { NULL, 0, 0, 1 };
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int i;
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find_conflict(&conflict);
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/*
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* MERGE_RR records paths with conflicts immediately after merge
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* failed. Some of the conflicted paths might have been hand resolved
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* in the working tree since then, but the initial run would catch all
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* and register their preimages.
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*/
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for (i = 0; i < conflict.nr; i++) {
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const char *path = conflict.items[i].path;
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if (!path_list_has_path(rr, path)) {
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unsigned char sha1[20];
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char *hex;
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int ret;
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ret = handle_file(path, sha1, NULL);
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if (ret < 1)
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continue;
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hex = xstrdup(sha1_to_hex(sha1));
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path_list_insert(path, rr)->util = hex;
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if (mkdir(git_path("rr-cache/%s", hex), 0755))
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continue;;
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handle_file(path, NULL, rr_path(hex, "preimage"));
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fprintf(stderr, "Recorded preimage for '%s'\n", path);
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}
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}
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/*
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* Now some of the paths that had conflicts earlier might have been
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* hand resolved. Others may be similar to a conflict already that
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* was resolved before.
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*/
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for (i = 0; i < rr->nr; i++) {
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struct stat st;
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int ret;
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const char *path = rr->items[i].path;
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const char *name = (const char *)rr->items[i].util;
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if (!stat(rr_path(name, "preimage"), &st) &&
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!stat(rr_path(name, "postimage"), &st)) {
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if (!merge(name, path)) {
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fprintf(stderr, "Resolved '%s' using "
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"previous resolution.\n", path);
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goto tail_optimization;
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}
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}
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/* Let's see if we have resolved it. */
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ret = handle_file(path, NULL, NULL);
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if (ret)
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continue;
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fprintf(stderr, "Recorded resolution for '%s'.\n", path);
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copy_file(path, rr_path(name, "postimage"));
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tail_optimization:
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if (i < rr->nr - 1)
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memmove(rr->items + i,
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rr->items + i + 1,
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sizeof(rr->items[0]) * (rr->nr - i - 1));
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rr->nr--;
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i--;
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}
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return write_rr(rr, fd);
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}
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static int git_rerere_config(const char *var, const char *value)
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{
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if (!strcmp(var, "gc.rerereresolved"))
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cutoff_resolve = git_config_int(var, value);
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else if (!strcmp(var, "gc.rerereunresolved"))
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cutoff_noresolve = git_config_int(var, value);
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else
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return git_default_config(var, value);
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return 0;
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}
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int cmd_rerere(int argc, const char **argv, const char *prefix)
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{
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struct path_list merge_rr = { NULL, 0, 0, 1 };
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int i, fd = -1;
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struct stat st;
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if (stat(git_path("rr-cache"), &st) || !S_ISDIR(st.st_mode))
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return 0;
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git_config(git_rerere_config);
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merge_rr_path = xstrdup(git_path("rr-cache/MERGE_RR"));
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fd = hold_lock_file_for_update(&write_lock, merge_rr_path, 1);
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read_rr(&merge_rr);
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if (argc < 2)
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return do_plain_rerere(&merge_rr, fd);
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else if (!strcmp(argv[1], "clear")) {
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for (i = 0; i < merge_rr.nr; i++) {
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const char *name = (const char *)merge_rr.items[i].util;
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if (!stat(git_path("rr-cache/%s", name), &st) &&
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S_ISDIR(st.st_mode) &&
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stat(rr_path(name, "postimage"), &st))
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unlink_rr_item(name);
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}
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unlink(merge_rr_path);
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} else if (!strcmp(argv[1], "gc"))
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garbage_collect(&merge_rr);
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else if (!strcmp(argv[1], "status"))
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for (i = 0; i < merge_rr.nr; i++)
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printf("%s\n", merge_rr.items[i].path);
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else if (!strcmp(argv[1], "diff"))
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for (i = 0; i < merge_rr.nr; i++) {
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const char *path = merge_rr.items[i].path;
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const char *name = (const char *)merge_rr.items[i].util;
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diff_two(rr_path(name, "preimage"), path, path, path);
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}
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else
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usage(git_rerere_usage);
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path_list_clear(&merge_rr, 1);
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return 0;
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}
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