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![Junio C Hamano](/assets/img/avatar_default.png)
It is unusual for a tag to point at a non-commit, and it is also unusual for a tag to have reflog, but that is not an error and we should still prune its reflog entries just as other refs. Signed-off-by: Junio C Hamano <junkio@cox.net>
213 lines
5 KiB
C
213 lines
5 KiB
C
#include "cache.h"
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#include "builtin.h"
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#include "commit.h"
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#include "refs.h"
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#include "dir.h"
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#include "tree-walk.h"
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struct expire_reflog_cb {
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FILE *newlog;
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const char *ref;
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struct commit *ref_commit;
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unsigned long expire_total;
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unsigned long expire_unreachable;
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};
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static int tree_is_complete(const unsigned char *sha1)
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{
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struct tree_desc desc;
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void *buf;
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char type[20];
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buf = read_sha1_file(sha1, type, &desc.size);
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if (!buf)
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return 0;
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desc.buf = buf;
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while (desc.size) {
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const unsigned char *elem;
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const char *name;
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unsigned mode;
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elem = tree_entry_extract(&desc, &name, &mode);
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if (!has_sha1_file(elem) ||
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(S_ISDIR(mode) && !tree_is_complete(elem))) {
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free(buf);
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return 0;
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}
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update_tree_entry(&desc);
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}
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free(buf);
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return 1;
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}
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static int keep_entry(struct commit **it, unsigned char *sha1)
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{
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struct commit *commit;
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*it = NULL;
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if (is_null_sha1(sha1))
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return 1;
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commit = lookup_commit_reference_gently(sha1, 1);
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if (!commit)
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return 0;
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/* Make sure everything in this commit exists. */
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parse_object(commit->object.sha1);
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if (!tree_is_complete(commit->tree->object.sha1))
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return 0;
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*it = commit;
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return 1;
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}
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static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
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char *data, void *cb_data)
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{
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struct expire_reflog_cb *cb = cb_data;
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unsigned long timestamp;
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char *cp, *ep;
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struct commit *old, *new;
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cp = strchr(data, '>');
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if (!cp || *++cp != ' ')
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goto prune;
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timestamp = strtoul(cp, &ep, 10);
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if (*ep != ' ')
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goto prune;
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if (timestamp < cb->expire_total)
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goto prune;
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if (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))
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goto prune;
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if ((timestamp < cb->expire_unreachable) &&
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(!cb->ref_commit ||
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(old && !in_merge_bases(old, cb->ref_commit)) ||
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(new && !in_merge_bases(new, cb->ref_commit))))
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goto prune;
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if (cb->newlog)
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fprintf(cb->newlog, "%s %s %s",
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sha1_to_hex(osha1), sha1_to_hex(nsha1), data);
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return 0;
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prune:
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if (!cb->newlog)
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fprintf(stderr, "would prune %s", data);
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return 0;
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}
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struct cmd_reflog_expire_cb {
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int dry_run;
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unsigned long expire_total;
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unsigned long expire_unreachable;
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};
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static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data)
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{
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struct cmd_reflog_expire_cb *cmd = cb_data;
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struct expire_reflog_cb cb;
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struct ref_lock *lock;
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char *newlog_path = NULL;
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int status = 0;
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if (strncmp(ref, "refs/", 5))
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return error("not a ref '%s'", ref);
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memset(&cb, 0, sizeof(cb));
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/* we take the lock for the ref itself to prevent it from
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* getting updated.
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*/
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lock = lock_ref_sha1(ref + 5, sha1);
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if (!lock)
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return error("cannot lock ref '%s'", ref);
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if (!file_exists(lock->log_file))
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goto finish;
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if (!cmd->dry_run) {
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newlog_path = xstrdup(git_path("logs/%s.lock", ref));
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cb.newlog = fopen(newlog_path, "w");
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}
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cb.ref_commit = lookup_commit_reference_gently(sha1, 1);
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if (!cb.ref_commit)
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fprintf(stderr,
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"warning: ref '%s' does not point at a commit\n", ref);
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cb.ref = ref;
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cb.expire_total = cmd->expire_total;
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cb.expire_unreachable = cmd->expire_unreachable;
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for_each_reflog_ent(ref, expire_reflog_ent, &cb);
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finish:
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if (cb.newlog) {
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if (fclose(cb.newlog))
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status |= error("%s: %s", strerror(errno),
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newlog_path);
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if (rename(newlog_path, lock->log_file)) {
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status |= error("cannot rename %s to %s",
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newlog_path, lock->log_file);
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unlink(newlog_path);
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}
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}
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free(newlog_path);
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unlock_ref(lock);
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return status;
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}
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static const char reflog_expire_usage[] =
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"git-reflog expire [--dry-run] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...";
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static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
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{
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struct cmd_reflog_expire_cb cb;
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unsigned long now = time(NULL);
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int i, status, do_all;
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save_commit_buffer = 0;
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do_all = status = 0;
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memset(&cb, 0, sizeof(cb));
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cb.expire_total = now - 90 * 24 * 3600;
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cb.expire_unreachable = now - 30 * 24 * 3600;
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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, "--dry-run") || !strcmp(arg, "-n"))
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cb.dry_run = 1;
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else if (!strncmp(arg, "--expire=", 9))
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cb.expire_total = approxidate(arg + 9);
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else if (!strncmp(arg, "--expire-unreachable=", 21))
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cb.expire_unreachable = approxidate(arg + 21);
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else if (!strcmp(arg, "--all"))
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do_all = 1;
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else if (!strcmp(arg, "--")) {
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i++;
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break;
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}
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else if (arg[0] == '-')
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usage(reflog_expire_usage);
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else
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break;
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}
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if (do_all)
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status |= for_each_ref(expire_reflog, &cb);
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while (i < argc) {
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const char *ref = argv[i++];
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unsigned char sha1[20];
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if (!resolve_ref(ref, sha1, 1, NULL)) {
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status |= error("%s points nowhere!", ref);
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continue;
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}
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status |= expire_reflog(ref, sha1, 0, &cb);
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}
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return status;
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}
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static const char reflog_usage[] =
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"git-reflog (expire | ...)";
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int cmd_reflog(int argc, const char **argv, const char *prefix)
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{
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if (argc < 2)
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usage(reflog_usage);
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else if (!strcmp(argv[1], "expire"))
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return cmd_reflog_expire(argc - 1, argv + 1, prefix);
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else
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usage(reflog_usage);
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}
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