9688460152
"git pack-refs --prune", after successfully packing the existing refs, removes the loose ref files. It tries to protect against race by doing the usual lock_ref_sha1() which makes sure the contents of the ref has not changed since we last looked at. Also we do not bother trying to prune what was already packed, and we do not try pruning symbolic refs. Signed-off-by: Junio C Hamano <junkio@cox.net>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
#include "cache.h"
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#include "refs.h"
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static const char *result_path, *lock_path;
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static const char builtin_pack_refs_usage[] =
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"git-pack-refs [--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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struct ref_to_prune *ref_to_prune;
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FILE *refs_file;
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};
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static void remove_lock_file(void)
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{
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if (lock_path)
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unlink(lock_path);
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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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/* Do not pack the symbolic refs */
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if (!(flags & REF_ISSYMREF))
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fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
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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, 1);
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if (lock) {
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unlink(git_path(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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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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/* 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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result_path = xstrdup(git_path("packed-refs"));
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lock_path = xstrdup(mkpath("%s.lock", result_path));
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fd = open(lock_path, O_CREAT | O_EXCL | O_WRONLY, 0666);
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if (fd < 0)
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die("unable to create new ref-pack file (%s)", strerror(errno));
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atexit(remove_lock_file);
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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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for_each_ref(handle_one_ref, &cbdata);
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fsync(fd);
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fclose(cbdata.refs_file);
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if (rename(lock_path, result_path) < 0)
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die("unable to overwrite old ref-pack file (%s)", strerror(errno));
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lock_path = NULL;
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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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