diff options
Diffstat (limited to 'builtin/reflog.c')
| -rw-r--r-- | builtin/reflog.c | 719 |
1 files changed, 719 insertions, 0 deletions
diff --git a/builtin/reflog.c b/builtin/reflog.c new file mode 100644 index 0000000000..749821078d --- /dev/null +++ b/builtin/reflog.c @@ -0,0 +1,719 @@ +#include "cache.h" +#include "builtin.h" +#include "commit.h" +#include "refs.h" +#include "dir.h" +#include "tree-walk.h" +#include "diff.h" +#include "revision.h" +#include "reachable.h" + +/* + * reflog expire + */ + +static const char reflog_expire_usage[] = +"git reflog (show|expire) [--verbose] [--dry-run] [--stale-fix] [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>..."; +static const char reflog_delete_usage[] = +"git reflog delete [--verbose] [--dry-run] [--rewrite] [--updateref] <refs>..."; + +static unsigned long default_reflog_expire; +static unsigned long default_reflog_expire_unreachable; + +struct cmd_reflog_expire_cb { + struct rev_info revs; + int dry_run; + int stalefix; + int rewrite; + int updateref; + int verbose; + unsigned long expire_total; + unsigned long expire_unreachable; + int recno; +}; + +struct expire_reflog_cb { + FILE *newlog; + const char *ref; + struct commit *ref_commit; + struct cmd_reflog_expire_cb *cmd; + unsigned char last_kept_sha1[20]; +}; + +struct collected_reflog { + unsigned char sha1[20]; + char reflog[FLEX_ARRAY]; +}; +struct collect_reflog_cb { + struct collected_reflog **e; + int alloc; + int nr; +}; + +#define INCOMPLETE (1u<<10) +#define STUDYING (1u<<11) +#define REACHABLE (1u<<12) + +static int tree_is_complete(const unsigned char *sha1) +{ + struct tree_desc desc; + struct name_entry entry; + int complete; + struct tree *tree; + + tree = lookup_tree(sha1); + if (!tree) + return 0; + if (tree->object.flags & SEEN) + return 1; + if (tree->object.flags & INCOMPLETE) + return 0; + + if (!tree->buffer) { + enum object_type type; + unsigned long size; + void *data = read_sha1_file(sha1, &type, &size); + if (!data) { + tree->object.flags |= INCOMPLETE; + return 0; + } + tree->buffer = data; + tree->size = size; + } + init_tree_desc(&desc, tree->buffer, tree->size); + complete = 1; + while (tree_entry(&desc, &entry)) { + if (!has_sha1_file(entry.sha1) || + (S_ISDIR(entry.mode) && !tree_is_complete(entry.sha1))) { + tree->object.flags |= INCOMPLETE; + complete = 0; + } + } + free(tree->buffer); + tree->buffer = NULL; + + if (complete) + tree->object.flags |= SEEN; + return complete; +} + +static int commit_is_complete(struct commit *commit) +{ + struct object_array study; + struct object_array found; + int is_incomplete = 0; + int i; + + /* early return */ + if (commit->object.flags & SEEN) + return 1; + if (commit->object.flags & INCOMPLETE) + return 0; + /* + * Find all commits that are reachable and are not marked as + * SEEN. Then make sure the trees and blobs contained are + * complete. After that, mark these commits also as SEEN. + * If some of the objects that are needed to complete this + * commit are missing, mark this commit as INCOMPLETE. + */ + memset(&study, 0, sizeof(study)); + memset(&found, 0, sizeof(found)); + add_object_array(&commit->object, NULL, &study); + add_object_array(&commit->object, NULL, &found); + commit->object.flags |= STUDYING; + while (study.nr) { + struct commit *c; + struct commit_list *parent; + + c = (struct commit *)study.objects[--study.nr].item; + if (!c->object.parsed && !parse_object(c->object.sha1)) + c->object.flags |= INCOMPLETE; + + if (c->object.flags & INCOMPLETE) { + is_incomplete = 1; + break; + } + else if (c->object.flags & SEEN) + continue; + for (parent = c->parents; parent; parent = parent->next) { + struct commit *p = parent->item; + if (p->object.flags & STUDYING) + continue; + p->object.flags |= STUDYING; + add_object_array(&p->object, NULL, &study); + add_object_array(&p->object, NULL, &found); + } + } + if (!is_incomplete) { + /* + * make sure all commits in "found" array have all the + * necessary objects. + */ + for (i = 0; i < found.nr; i++) { + struct commit *c = + (struct commit *)found.objects[i].item; + if (!tree_is_complete(c->tree->object.sha1)) { + is_incomplete = 1; + c->object.flags |= INCOMPLETE; + } + } + if (!is_incomplete) { + /* mark all found commits as complete, iow SEEN */ + for (i = 0; i < found.nr; i++) + found.objects[i].item->flags |= SEEN; + } + } + /* clear flags from the objects we traversed */ + for (i = 0; i < found.nr; i++) + found.objects[i].item->flags &= ~STUDYING; + if (is_incomplete) + commit->object.flags |= INCOMPLETE; + else { + /* + * If we come here, we have (1) traversed the ancestry chain + * from the "commit" until we reach SEEN commits (which are + * known to be complete), and (2) made sure that the commits + * encountered during the above traversal refer to trees that + * are complete. Which means that we know *all* the commits + * we have seen during this process are complete. + */ + for (i = 0; i < found.nr; i++) + found.objects[i].item->flags |= SEEN; + } + /* free object arrays */ + free(study.objects); + free(found.objects); + return !is_incomplete; +} + +static int keep_entry(struct commit **it, unsigned char *sha1) +{ + struct commit *commit; + + if (is_null_sha1(sha1)) + return 1; + commit = lookup_commit_reference_gently(sha1, 1); + if (!commit) + return 0; + + /* + * Make sure everything in this commit exists. + * + * We have walked all the objects reachable from the refs + * and cache earlier. The commits reachable by this commit + * must meet SEEN commits -- and then we should mark them as + * SEEN as well. + */ + if (!commit_is_complete(commit)) + return 0; + *it = commit; + return 1; +} + +static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsigned char *sha1) +{ + /* + * We may or may not have the commit yet - if not, look it + * up using the supplied sha1. + */ + if (!commit) { + if (is_null_sha1(sha1)) + return 0; + + commit = lookup_commit_reference_gently(sha1, 1); + + /* Not a commit -- keep it */ + if (!commit) + return 0; + } + + /* Reachable from the current ref? Don't prune. */ + if (commit->object.flags & REACHABLE) + return 0; + if (in_merge_bases(commit, &cb->ref_commit, 1)) + return 0; + + /* We can't reach it - prune it. */ + return 1; +} + +static void mark_reachable(struct commit *commit, unsigned long expire_limit) +{ + /* + * We need to compute whether the commit on either side of a reflog + * entry is reachable from the tip of the ref for all entries. + * Mark commits that are reachable from the tip down to the + * time threshold first; we know a commit marked thusly is + * reachable from the tip without running in_merge_bases() + * at all. + */ + struct commit_list *pending = NULL; + + commit_list_insert(commit, &pending); + while (pending) { + struct commit_list *entry = pending; + struct commit_list *parent; + pending = entry->next; + commit = entry->item; + free(entry); + if (commit->object.flags & REACHABLE) + continue; + if (parse_commit(commit)) + continue; + commit->object.flags |= REACHABLE; + if (commit->date < expire_limit) + continue; + parent = commit->parents; + while (parent) { + commit = parent->item; + parent = parent->next; + if (commit->object.flags & REACHABLE) + continue; + commit_list_insert(commit, &pending); + } + } +} + +static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1, + const char *email, unsigned long timestamp, int tz, + const char *message, void *cb_data) +{ + struct expire_reflog_cb *cb = cb_data; + struct commit *old, *new; + + if (timestamp < cb->cmd->expire_total) + goto prune; + + if (cb->cmd->rewrite) + osha1 = cb->last_kept_sha1; + + old = new = NULL; + if (cb->cmd->stalefix && + (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))) + goto prune; + + if (timestamp < cb->cmd->expire_unreachable) { + if (!cb->ref_commit) + goto prune; + if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1)) + goto prune; + } + + if (cb->cmd->recno && --(cb->cmd->recno) == 0) + goto prune; + + if (cb->newlog) { + char sign = (tz < 0) ? '-' : '+'; + int zone = (tz < 0) ? (-tz) : tz; + fprintf(cb->newlog, "%s %s %s %lu %c%04d\t%s", + sha1_to_hex(osha1), sha1_to_hex(nsha1), + email, timestamp, sign, zone, + message); + hashcpy(cb->last_kept_sha1, nsha1); + } + if (cb->cmd->verbose) + printf("keep %s", message); + return 0; + prune: + if (!cb->newlog || cb->cmd->verbose) + printf("%sprune %s", cb->newlog ? "" : "would ", message); + return 0; +} + +static int expire_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data) +{ + struct cmd_reflog_expire_cb *cmd = cb_data; + struct expire_reflog_cb cb; + struct ref_lock *lock; + char *log_file, *newlog_path = NULL; + int status = 0; + + memset(&cb, 0, sizeof(cb)); + + /* + * we take the lock for the ref itself to prevent it from + * getting updated. + */ + lock = lock_any_ref_for_update(ref, sha1, 0); + if (!lock) + return error("cannot lock ref '%s'", ref); + log_file = git_pathdup("logs/%s", ref); + if (!file_exists(log_file)) + goto finish; + if (!cmd->dry_run) { + newlog_path = git_pathdup("logs/%s.lock", ref); + cb.newlog = fopen(newlog_path, "w"); + } + + cb.ref_commit = lookup_commit_reference_gently(sha1, 1); + cb.ref = ref; + cb.cmd = cmd; + if (cb.ref_commit) + mark_reachable(cb.ref_commit, cmd->expire_total); + for_each_reflog_ent(ref, expire_reflog_ent, &cb); + if (cb.ref_commit) + clear_commit_marks(cb.ref_commit, REACHABLE); + finish: + if (cb.newlog) { + if (fclose(cb.newlog)) { + status |= error("%s: %s", strerror(errno), + newlog_path); + unlink(newlog_path); + } else if (cmd->updateref && + (write_in_full(lock->lock_fd, + sha1_to_hex(cb.last_kept_sha1), 40) != 40 || + write_str_in_full(lock->lock_fd, "\n") != 1 || + close_ref(lock) < 0)) { + status |= error("Couldn't write %s", + lock->lk->filename); + unlink(newlog_path); + } else if (rename(newlog_path, log_file)) { + status |= error("cannot rename %s to %s", + newlog_path, log_file); + unlink(newlog_path); + } else if (cmd->updateref && commit_ref(lock)) { + status |= error("Couldn't set %s", lock->ref_name); + } else { + adjust_shared_perm(log_file); + } + } + free(newlog_path); + free(log_file); + unlock_ref(lock); + return status; +} + +static int collect_reflog(const char *ref, const unsigned char *sha1, int unused, void *cb_data) +{ + struct collected_reflog *e; + struct collect_reflog_cb *cb = cb_data; + size_t namelen = strlen(ref); + + e = xmalloc(sizeof(*e) + namelen + 1); + hashcpy(e->sha1, sha1); + memcpy(e->reflog, ref, namelen + 1); + ALLOC_GROW(cb->e, cb->nr + 1, cb->alloc); + cb->e[cb->nr++] = e; + return 0; +} + +static struct reflog_expire_cfg { + struct reflog_expire_cfg *next; + unsigned long expire_total; + unsigned long expire_unreachable; + size_t len; + char pattern[FLEX_ARRAY]; +} *reflog_expire_cfg, **reflog_expire_cfg_tail; + +static struct reflog_expire_cfg *find_cfg_ent(const char *pattern, size_t len) +{ + struct reflog_expire_cfg *ent; + + if (!reflog_expire_cfg_tail) + reflog_expire_cfg_tail = &reflog_expire_cfg; + + for (ent = reflog_expire_cfg; ent; ent = ent->next) + if (ent->len == len && + !memcmp(ent->pattern, pattern, len)) + return ent; + + ent = xcalloc(1, (sizeof(*ent) + len)); + memcpy(ent->pattern, pattern, len); + ent->len = len; + *reflog_expire_cfg_tail = ent; + reflog_expire_cfg_tail = &(ent->next); + return ent; +} + +static int parse_expire_cfg_value(const char *var, const char *value, unsigned long *expire) +{ + if (!value) + return config_error_nonbool(var); + if (!strcmp(value, "never") || !strcmp(value, "false")) { + *expire = 0; + return 0; + } + *expire = approxidate(value); + return 0; +} + +/* expiry timer slot */ +#define EXPIRE_TOTAL 01 +#define EXPIRE_UNREACH 02 + +static int reflog_expire_config(const char *var, const char *value, void *cb) +{ + const char *lastdot = strrchr(var, '.'); + unsigned long expire; + int slot; + struct reflog_expire_cfg *ent; + + if (!lastdot || prefixcmp(var, "gc.")) + return git_default_config(var, value, cb); + + if (!strcmp(lastdot, ".reflogexpire")) { + slot = EXPIRE_TOTAL; + if (parse_expire_cfg_value(var, value, &expire)) + return -1; + } else if (!strcmp(lastdot, ".reflogexpireunreachable")) { + slot = EXPIRE_UNREACH; + if (parse_expire_cfg_value(var, value, &expire)) + return -1; + } else + return git_default_config(var, value, cb); + + if (lastdot == var + 2) { + switch (slot) { + case EXPIRE_TOTAL: + default_reflog_expire = expire; + break; + case EXPIRE_UNREACH: + default_reflog_expire_unreachable = expire; + break; + } + return 0; + } + + ent = find_cfg_ent(var + 3, lastdot - (var+3)); + if (!ent) + return -1; + switch (slot) { + case EXPIRE_TOTAL: + ent->expire_total = expire; + break; + case EXPIRE_UNREACH: + ent->expire_unreachable = expire; + break; + } + return 0; +} + +static void set_reflog_expiry_param(struct cmd_reflog_expire_cb *cb, int slot, const char *ref) +{ + struct reflog_expire_cfg *ent; + + if (slot == (EXPIRE_TOTAL|EXPIRE_UNREACH)) + return; /* both given explicitly -- nothing to tweak */ + + for (ent = reflog_expire_cfg; ent; ent = ent->next) { + if (!fnmatch(ent->pattern, ref, 0)) { + if (!(slot & EXPIRE_TOTAL)) + cb->expire_total = ent->expire_total; + if (!(slot & EXPIRE_UNREACH)) + cb->expire_unreachable = ent->expire_unreachable; + return; + } + } + + /* + * If unconfigured, make stash never expire + */ + if (!strcmp(ref, "refs/stash")) { + if (!(slot & EXPIRE_TOTAL)) + cb->expire_total = 0; + if (!(slot & EXPIRE_UNREACH)) + cb->expire_unreachable = 0; + return; + } + + /* Nothing matched -- use the default value */ + if (!(slot & EXPIRE_TOTAL)) + cb->expire_total = default_reflog_expire; + if (!(slot & EXPIRE_UNREACH)) + cb->expire_unreachable = default_reflog_expire_unreachable; +} + +static int cmd_reflog_expire(int argc, const char **argv, const char *prefix) +{ + struct cmd_reflog_expire_cb cb; + unsigned long now = time(NULL); + int i, status, do_all; + int explicit_expiry = 0; + + git_config(reflog_expire_config, NULL); + + save_commit_buffer = 0; + do_all = status = 0; + memset(&cb, 0, sizeof(cb)); + + if (!default_reflog_expire_unreachable) + default_reflog_expire_unreachable = now - 30 * 24 * 3600; + if (!default_reflog_expire) + default_reflog_expire = now - 90 * 24 * 3600; + cb.expire_total = default_reflog_expire; + cb.expire_unreachable = default_reflog_expire_unreachable; + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n")) + cb.dry_run = 1; + else if (!prefixcmp(arg, "--expire=")) { + cb.expire_total = approxidate(arg + 9); + explicit_expiry |= EXPIRE_TOTAL; + } + else if (!prefixcmp(arg, "--expire-unreachable=")) { + cb.expire_unreachable = approxidate(arg + 21); + explicit_expiry |= EXPIRE_UNREACH; + } + else if (!strcmp(arg, "--stale-fix")) + cb.stalefix = 1; + else if (!strcmp(arg, "--rewrite")) + cb.rewrite = 1; + else if (!strcmp(arg, "--updateref")) + cb.updateref = 1; + else if (!strcmp(arg, "--all")) + do_all = 1; + else if (!strcmp(arg, "--verbose")) + cb.verbose = 1; + else if (!strcmp(arg, "--")) { + i++; + break; + } + else if (arg[0] == '-') + usage(reflog_expire_usage); + else + break; + } + + /* + * We can trust the commits and objects reachable from refs + * even in older repository. We cannot trust what's reachable + * from reflog if the repository was pruned with older git. + */ + if (cb.stalefix) { + init_revisions(&cb.revs, prefix); + if (cb.verbose) + printf("Marking reachable objects..."); + mark_reachable_objects(&cb.revs, 0); + if (cb.verbose) + putchar('\n'); + } + + if (do_all) { + struct collect_reflog_cb collected; + int i; + + memset(&collected, 0, sizeof(collected)); + for_each_reflog(collect_reflog, &collected); + for (i = 0; i < collected.nr; i++) { + struct collected_reflog *e = collected.e[i]; + set_reflog_expiry_param(&cb, explicit_expiry, e->reflog); + status |= expire_reflog(e->reflog, e->sha1, 0, &cb); + free(e); + } + free(collected.e); + } + + for (; i < argc; i++) { + char *ref; + unsigned char sha1[20]; + if (!dwim_log(argv[i], strlen(argv[i]), sha1, &ref)) { + status |= error("%s points nowhere!", argv[i]); + continue; + } + set_reflog_expiry_param(&cb, explicit_expiry, ref); + status |= expire_reflog(ref, sha1, 0, &cb); + } + return status; +} + +static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1, + const char *email, unsigned long timestamp, int tz, + const char *message, void *cb_data) +{ + struct cmd_reflog_expire_cb *cb = cb_data; + if (!cb->expire_total || timestamp < cb->expire_total) + cb->recno++; + return 0; +} + +static int cmd_reflog_delete(int argc, const char **argv, const char *prefix) +{ + struct cmd_reflog_expire_cb cb; + int i, status = 0; + + memset(&cb, 0, sizeof(cb)); + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n")) + cb.dry_run = 1; + else if (!strcmp(arg, "--rewrite")) + cb.rewrite = 1; + else if (!strcmp(arg, "--updateref")) + cb.updateref = 1; + else if (!strcmp(arg, "--verbose")) + cb.verbose = 1; + else if (!strcmp(arg, "--")) { + i++; + break; + } + else if (arg[0] == '-') + usage(reflog_delete_usage); + else + break; + } + + if (argc - i < 1) + return error("Nothing to delete?"); + + for ( ; i < argc; i++) { + const char *spec = strstr(argv[i], "@{"); + unsigned char sha1[20]; + char *ep, *ref; + int recno; + + if (!spec) { + status |= error("Not a reflog: %s", argv[i]); + continue; + } + + if (!dwim_log(argv[i], spec - argv[i], sha1, &ref)) { + status |= error("no reflog for '%s'", argv[i]); + continue; + } + + recno = strtoul(spec + 2, &ep, 10); + if (*ep == '}') { + cb.recno = -recno; + for_each_reflog_ent(ref, count_reflog_ent, &cb); + } else { + cb.expire_total = approxidate(spec + 2); + for_each_reflog_ent(ref, count_reflog_ent, &cb); + cb.expire_total = 0; + } + + status |= expire_reflog(ref, sha1, 0, &cb); + free(ref); + } + return status; +} + +/* + * main "reflog" + */ + +static const char reflog_usage[] = +"git reflog [ show | expire | delete ]"; + +int cmd_reflog(int argc, const char **argv, const char *prefix) +{ + if (argc > 1 && !strcmp(argv[1], "-h")) + usage(reflog_usage); + + /* With no command, we default to showing it. */ + if (argc < 2 || *argv[1] == '-') + return cmd_log_reflog(argc, argv, prefix); + + if (!strcmp(argv[1], "show")) + return cmd_log_reflog(argc - 1, argv + 1, prefix); + + if (!strcmp(argv[1], "expire")) + return cmd_reflog_expire(argc - 1, argv + 1, prefix); + + if (!strcmp(argv[1], "delete")) + return cmd_reflog_delete(argc - 1, argv + 1, prefix); + + /* Not a recognized reflog command..*/ + usage(reflog_usage); +} |