mirror of
https://github.com/git/git.git
synced 2024-12-12 19:34:35 +08:00
f4204ab9f6
This fixes the previous implementation which failed to optimize repositories with tons of lightweight tags. The updated packed-refs format begins with "# packed-refs with:" line that lists the kind of extended data the file records. Currently, there is only one such extension defined, "peeled". This stores the "peeled tag" on a line that immediately follows a line for a tag object itself in the format "^<sha-1>". The header line itself and any extended data are ignored by older implementation, so packed-refs file generated with this version can still be used by older git. packed-refs made by older git can of course be used with this version. Signed-off-by: Junio C Hamano <junkio@cox.net>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "object.h"
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#include "tag.h"
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static const char builtin_pack_refs_usage[] =
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"git-pack-refs [--all] [--prune]";
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struct ref_to_prune {
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struct ref_to_prune *next;
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unsigned char sha1[20];
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char name[FLEX_ARRAY];
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};
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struct pack_refs_cb_data {
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int prune;
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int all;
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struct ref_to_prune *ref_to_prune;
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FILE *refs_file;
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};
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static int do_not_prune(int flags)
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{
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/* If it is already packed or if it is a symref,
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* do not prune it.
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*/
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return (flags & (REF_ISSYMREF|REF_ISPACKED));
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}
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static int handle_one_ref(const char *path, const unsigned char *sha1,
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int flags, void *cb_data)
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{
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struct pack_refs_cb_data *cb = cb_data;
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int is_tag_ref;
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/* Do not pack the symbolic refs */
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if ((flags & REF_ISSYMREF))
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return 0;
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is_tag_ref = !strncmp(path, "refs/tags/", 10);
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if (!cb->all && !is_tag_ref)
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return 0;
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fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
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if (is_tag_ref) {
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struct object *o = parse_object(sha1);
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if (o->type == OBJ_TAG) {
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o = deref_tag(o, path, 0);
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if (o)
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fprintf(cb->refs_file, "^%s\n",
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sha1_to_hex(o->sha1));
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}
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}
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if (cb->prune && !do_not_prune(flags)) {
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int namelen = strlen(path) + 1;
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struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
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hashcpy(n->sha1, sha1);
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strcpy(n->name, path);
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n->next = cb->ref_to_prune;
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cb->ref_to_prune = n;
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}
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return 0;
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}
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/* make sure nobody touched the ref, and unlink */
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static void prune_ref(struct ref_to_prune *r)
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{
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struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
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if (lock) {
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unlink(git_path("%s", r->name));
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unlock_ref(lock);
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}
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}
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static void prune_refs(struct ref_to_prune *r)
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{
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while (r) {
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prune_ref(r);
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r = r->next;
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}
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}
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static struct lock_file packed;
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int cmd_pack_refs(int argc, const char **argv, const char *prefix)
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{
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int fd, i;
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struct pack_refs_cb_data cbdata;
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memset(&cbdata, 0, sizeof(cbdata));
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (!strcmp(arg, "--prune")) {
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cbdata.prune = 1;
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continue;
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}
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if (!strcmp(arg, "--all")) {
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cbdata.all = 1;
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continue;
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}
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/* perhaps other parameters later... */
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break;
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}
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if (i != argc)
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usage(builtin_pack_refs_usage);
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fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
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cbdata.refs_file = fdopen(fd, "w");
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if (!cbdata.refs_file)
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die("unable to create ref-pack file structure (%s)",
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strerror(errno));
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/* perhaps other traits later as well */
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fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
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for_each_ref(handle_one_ref, &cbdata);
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fflush(cbdata.refs_file);
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fsync(fd);
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fclose(cbdata.refs_file);
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if (commit_lock_file(&packed) < 0)
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die("unable to overwrite old ref-pack file (%s)", strerror(errno));
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if (cbdata.prune)
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prune_refs(cbdata.ref_to_prune);
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return 0;
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}
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