diff options
Diffstat (limited to 'builtin/reflog.c')
| -rw-r--r-- | builtin/reflog.c | 759 |
1 files changed, 759 insertions, 0 deletions
diff --git a/builtin/reflog.c b/builtin/reflog.c new file mode 100644 index 0000000000..f96ca2a27d --- /dev/null +++ b/builtin/reflog.c @@ -0,0 +1,759 @@ +#include "builtin.h" +#include "lockfile.h" +#include "commit.h" +#include "refs.h" +#include "dir.h" +#include "tree-walk.h" +#include "diff.h" +#include "revision.h" +#include "reachable.h" + +/* NEEDSWORK: switch to using parse_options */ +static const char reflog_expire_usage[] = +"git reflog expire [--expire=<time>] [--expire-unreachable=<time>] [--rewrite] [--updateref] [--stale-fix] [--dry-run | -n] [--verbose] [--all] <refs>..."; +static const char reflog_delete_usage[] = +"git reflog delete [--rewrite] [--updateref] [--dry-run | -n] [--verbose] <refs>..."; +static const char reflog_exists_usage[] = +"git reflog exists <ref>"; + +static unsigned long default_reflog_expire; +static unsigned long default_reflog_expire_unreachable; + +struct cmd_reflog_expire_cb { + struct rev_info revs; + int stalefix; + unsigned long expire_total; + unsigned long expire_unreachable; + int recno; +}; + +struct expire_reflog_policy_cb { + enum { + UE_NORMAL, + UE_ALWAYS, + UE_HEAD + } unreachable_expire_kind; + struct commit_list *mark_list; + unsigned long mark_limit; + struct cmd_reflog_expire_cb cmd; + struct commit *tip_commit; + struct commit_list *tips; +}; + +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); + + 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; +} + +/* + * Starting from commits in the cb->mark_list, mark commits that are + * reachable from them. Stop the traversal at commits older than + * the expire_limit and queue them back, so that the caller can call + * us again to restart the traversal with longer expire_limit. + */ +static void mark_reachable(struct expire_reflog_policy_cb *cb) +{ + struct commit *commit; + struct commit_list *pending; + unsigned long expire_limit = cb->mark_limit; + struct commit_list *leftover = NULL; + + for (pending = cb->mark_list; pending; pending = pending->next) + pending->item->object.flags &= ~REACHABLE; + + pending = cb->mark_list; + 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) { + commit_list_insert(commit, &leftover); + continue; + } + commit->object.flags |= REACHABLE; + parent = commit->parents; + while (parent) { + commit = parent->item; + parent = parent->next; + if (commit->object.flags & REACHABLE) + continue; + commit_list_insert(commit, &pending); + } + } + cb->mark_list = leftover; +} + +static int unreachable(struct expire_reflog_policy_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 (cb->mark_list && cb->mark_limit) { + cb->mark_limit = 0; /* dig down to the root */ + mark_reachable(cb); + } + + return !(commit->object.flags & REACHABLE); +} + +/* + * Return true iff the specified reflog entry should be expired. + */ +static int should_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_policy_cb *cb = cb_data; + struct commit *old, *new; + + if (timestamp < cb->cmd.expire_total) + return 1; + + old = new = NULL; + if (cb->cmd.stalefix && + (!keep_entry(&old, osha1) || !keep_entry(&new, nsha1))) + return 1; + + if (timestamp < cb->cmd.expire_unreachable) { + if (cb->unreachable_expire_kind == UE_ALWAYS) + return 1; + if (unreachable(cb, old, osha1) || unreachable(cb, new, nsha1)) + return 1; + } + + if (cb->cmd.recno && --(cb->cmd.recno) == 0) + return 1; + + return 0; +} + +static int push_tip_to_list(const char *refname, const struct object_id *oid, + int flags, void *cb_data) +{ + struct commit_list **list = cb_data; + struct commit *tip_commit; + if (flags & REF_ISSYMREF) + return 0; + tip_commit = lookup_commit_reference_gently(oid->hash, 1); + if (!tip_commit) + return 0; + commit_list_insert(tip_commit, list); + return 0; +} + +static void reflog_expiry_prepare(const char *refname, + const unsigned char *sha1, + void *cb_data) +{ + struct expire_reflog_policy_cb *cb = cb_data; + + if (!cb->cmd.expire_unreachable || !strcmp(refname, "HEAD")) { + cb->tip_commit = NULL; + cb->unreachable_expire_kind = UE_HEAD; + } else { + cb->tip_commit = lookup_commit_reference_gently(sha1, 1); + if (!cb->tip_commit) + cb->unreachable_expire_kind = UE_ALWAYS; + else + cb->unreachable_expire_kind = UE_NORMAL; + } + + if (cb->cmd.expire_unreachable <= cb->cmd.expire_total) + cb->unreachable_expire_kind = UE_ALWAYS; + + cb->mark_list = NULL; + cb->tips = NULL; + if (cb->unreachable_expire_kind != UE_ALWAYS) { + if (cb->unreachable_expire_kind == UE_HEAD) { + struct commit_list *elem; + + for_each_ref(push_tip_to_list, &cb->tips); + for (elem = cb->tips; elem; elem = elem->next) + commit_list_insert(elem->item, &cb->mark_list); + } else { + commit_list_insert(cb->tip_commit, &cb->mark_list); + } + cb->mark_limit = cb->cmd.expire_total; + mark_reachable(cb); + } +} + +static void reflog_expiry_cleanup(void *cb_data) +{ + struct expire_reflog_policy_cb *cb = cb_data; + + if (cb->unreachable_expire_kind != UE_ALWAYS) { + if (cb->unreachable_expire_kind == UE_HEAD) { + struct commit_list *elem; + for (elem = cb->tips; elem; elem = elem->next) + clear_commit_marks(elem->item, REACHABLE); + free_commit_list(cb->tips); + } else { + clear_commit_marks(cb->tip_commit, REACHABLE); + } + } +} + +static int collect_reflog(const char *ref, const struct object_id *oid, 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, oid->hash); + 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 (parse_expiry_date(value, expire)) + return error(_("'%s' for '%s' is not a valid timestamp"), + value, var); + 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 *pattern, *key; + int pattern_len; + unsigned long expire; + int slot; + struct reflog_expire_cfg *ent; + + if (parse_config_key(var, "gc", &pattern, &pattern_len, &key) < 0) + return git_default_config(var, value, cb); + + if (!strcmp(key, "reflogexpire")) { + slot = EXPIRE_TOTAL; + if (parse_expire_cfg_value(var, value, &expire)) + return -1; + } else if (!strcmp(key, "reflogexpireunreachable")) { + slot = EXPIRE_UNREACH; + if (parse_expire_cfg_value(var, value, &expire)) + return -1; + } else + return git_default_config(var, value, cb); + + if (!pattern) { + 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(pattern, pattern_len); + 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 (!wildmatch(ent->pattern, ref, 0, NULL)) { + 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 expire_reflog_policy_cb cb; + unsigned long now = time(NULL); + int i, status, do_all; + int explicit_expiry = 0; + unsigned int flags = 0; + + default_reflog_expire_unreachable = now - 30 * 24 * 3600; + default_reflog_expire = now - 90 * 24 * 3600; + git_config(reflog_expire_config, NULL); + + save_commit_buffer = 0; + do_all = status = 0; + memset(&cb, 0, sizeof(cb)); + + cb.cmd.expire_total = default_reflog_expire; + cb.cmd.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")) + flags |= EXPIRE_REFLOGS_DRY_RUN; + else if (starts_with(arg, "--expire=")) { + if (parse_expiry_date(arg + 9, &cb.cmd.expire_total)) + die(_("'%s' is not a valid timestamp"), arg); + explicit_expiry |= EXPIRE_TOTAL; + } + else if (starts_with(arg, "--expire-unreachable=")) { + if (parse_expiry_date(arg + 21, &cb.cmd.expire_unreachable)) + die(_("'%s' is not a valid timestamp"), arg); + explicit_expiry |= EXPIRE_UNREACH; + } + else if (!strcmp(arg, "--stale-fix")) + cb.cmd.stalefix = 1; + else if (!strcmp(arg, "--rewrite")) + flags |= EXPIRE_REFLOGS_REWRITE; + else if (!strcmp(arg, "--updateref")) + flags |= EXPIRE_REFLOGS_UPDATE_REF; + else if (!strcmp(arg, "--all")) + do_all = 1; + else if (!strcmp(arg, "--verbose")) + flags |= EXPIRE_REFLOGS_VERBOSE; + 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.cmd.stalefix) { + init_revisions(&cb.cmd.revs, prefix); + if (flags & EXPIRE_REFLOGS_VERBOSE) + printf("Marking reachable objects..."); + mark_reachable_objects(&cb.cmd.revs, 0, 0, NULL); + if (flags & EXPIRE_REFLOGS_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.cmd, explicit_expiry, e->reflog); + status |= reflog_expire(e->reflog, e->sha1, flags, + reflog_expiry_prepare, + should_expire_reflog_ent, + reflog_expiry_cleanup, + &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.cmd, explicit_expiry, ref); + status |= reflog_expire(ref, sha1, flags, + reflog_expiry_prepare, + should_expire_reflog_ent, + reflog_expiry_cleanup, + &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 expire_reflog_policy_cb *cb = cb_data; + if (!cb->cmd.expire_total || timestamp < cb->cmd.expire_total) + cb->cmd.recno++; + return 0; +} + +static int cmd_reflog_delete(int argc, const char **argv, const char *prefix) +{ + struct expire_reflog_policy_cb cb; + int i, status = 0; + unsigned int flags = 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")) + flags |= EXPIRE_REFLOGS_DRY_RUN; + else if (!strcmp(arg, "--rewrite")) + flags |= EXPIRE_REFLOGS_REWRITE; + else if (!strcmp(arg, "--updateref")) + flags |= EXPIRE_REFLOGS_UPDATE_REF; + else if (!strcmp(arg, "--verbose")) + flags |= EXPIRE_REFLOGS_VERBOSE; + 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.cmd.recno = -recno; + for_each_reflog_ent(ref, count_reflog_ent, &cb); + } else { + cb.cmd.expire_total = approxidate(spec + 2); + for_each_reflog_ent(ref, count_reflog_ent, &cb); + cb.cmd.expire_total = 0; + } + + status |= reflog_expire(ref, sha1, flags, + reflog_expiry_prepare, + should_expire_reflog_ent, + reflog_expiry_cleanup, + &cb); + free(ref); + } + return status; +} + +static int cmd_reflog_exists(int argc, const char **argv, const char *prefix) +{ + int i, start = 0; + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (!strcmp(arg, "--")) { + i++; + break; + } + else if (arg[0] == '-') + usage(reflog_exists_usage); + else + break; + } + + start = i; + + if (argc - start != 1) + usage(reflog_exists_usage); + + if (check_refname_format(argv[start], REFNAME_ALLOW_ONELEVEL)) + die("invalid ref format: %s", argv[start]); + return !reflog_exists(argv[start]); +} + +/* + * main "reflog" + */ + +static const char reflog_usage[] = +"git reflog [ show | expire | delete | exists ]"; + +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); + + if (!strcmp(argv[1], "exists")) + return cmd_reflog_exists(argc - 1, argv + 1, prefix); + + return cmd_log_reflog(argc, argv, prefix); +} |