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-rw-r--r--builtin/describe.c482
1 files changed, 482 insertions, 0 deletions
diff --git a/builtin/describe.c b/builtin/describe.c
new file mode 100644
index 0000000000..8a25abe0a0
--- /dev/null
+++ b/builtin/describe.c
@@ -0,0 +1,482 @@
+#include "cache.h"
+#include "lockfile.h"
+#include "commit.h"
+#include "tag.h"
+#include "refs.h"
+#include "builtin.h"
+#include "exec_cmd.h"
+#include "parse-options.h"
+#include "diff.h"
+#include "hashmap.h"
+#include "argv-array.h"
+
+#define SEEN (1u << 0)
+#define MAX_TAGS (FLAG_BITS - 1)
+
+static const char * const describe_usage[] = {
+ N_("git describe [<options>] [<commit-ish>...]"),
+ N_("git describe [<options>] --dirty"),
+ NULL
+};
+
+static int debug; /* Display lots of verbose info */
+static int all; /* Any valid ref can be used */
+static int tags; /* Allow lightweight tags */
+static int longformat;
+static int first_parent;
+static int abbrev = -1; /* unspecified */
+static int max_candidates = 10;
+static struct hashmap names;
+static int have_util;
+static const char *pattern;
+static int always;
+static const char *dirty;
+
+/* diff-index command arguments to check if working tree is dirty. */
+static const char *diff_index_args[] = {
+ "diff-index", "--quiet", "HEAD", "--", NULL
+};
+
+struct commit_name {
+ struct hashmap_entry entry;
+ unsigned char peeled[20];
+ struct tag *tag;
+ unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
+ unsigned name_checked:1;
+ unsigned char sha1[20];
+ char *path;
+};
+
+static const char *prio_names[] = {
+ "head", "lightweight", "annotated",
+};
+
+static int commit_name_cmp(const struct commit_name *cn1,
+ const struct commit_name *cn2, const void *peeled)
+{
+ return hashcmp(cn1->peeled, peeled ? peeled : cn2->peeled);
+}
+
+static inline struct commit_name *find_commit_name(const unsigned char *peeled)
+{
+ return hashmap_get_from_hash(&names, sha1hash(peeled), peeled);
+}
+
+static int replace_name(struct commit_name *e,
+ int prio,
+ const unsigned char *sha1,
+ struct tag **tag)
+{
+ if (!e || e->prio < prio)
+ return 1;
+
+ if (e->prio == 2 && prio == 2) {
+ /* Multiple annotated tags point to the same commit.
+ * Select one to keep based upon their tagger date.
+ */
+ struct tag *t;
+
+ if (!e->tag) {
+ t = lookup_tag(e->sha1);
+ if (!t || parse_tag(t))
+ return 1;
+ e->tag = t;
+ }
+
+ t = lookup_tag(sha1);
+ if (!t || parse_tag(t))
+ return 0;
+ *tag = t;
+
+ if (e->tag->date < t->date)
+ return 1;
+ }
+
+ return 0;
+}
+
+static void add_to_known_names(const char *path,
+ const unsigned char *peeled,
+ int prio,
+ const unsigned char *sha1)
+{
+ struct commit_name *e = find_commit_name(peeled);
+ struct tag *tag = NULL;
+ if (replace_name(e, prio, sha1, &tag)) {
+ if (!e) {
+ e = xmalloc(sizeof(struct commit_name));
+ hashcpy(e->peeled, peeled);
+ hashmap_entry_init(e, sha1hash(peeled));
+ hashmap_add(&names, e);
+ e->path = NULL;
+ }
+ e->tag = tag;
+ e->prio = prio;
+ e->name_checked = 0;
+ hashcpy(e->sha1, sha1);
+ free(e->path);
+ e->path = xstrdup(path);
+ }
+}
+
+static int get_name(const char *path, const struct object_id *oid, int flag, void *cb_data)
+{
+ int is_tag = starts_with(path, "refs/tags/");
+ struct object_id peeled;
+ int is_annotated, prio;
+
+ /* Reject anything outside refs/tags/ unless --all */
+ if (!all && !is_tag)
+ return 0;
+
+ /* Accept only tags that match the pattern, if given */
+ if (pattern && (!is_tag || wildmatch(pattern, path + 10, 0, NULL)))
+ return 0;
+
+ /* Is it annotated? */
+ if (!peel_ref(path, peeled.hash)) {
+ is_annotated = !!oidcmp(oid, &peeled);
+ } else {
+ oidcpy(&peeled, oid);
+ is_annotated = 0;
+ }
+
+ /*
+ * By default, we only use annotated tags, but with --tags
+ * we fall back to lightweight ones (even without --tags,
+ * we still remember lightweight ones, only to give hints
+ * in an error message). --all allows any refs to be used.
+ */
+ if (is_annotated)
+ prio = 2;
+ else if (is_tag)
+ prio = 1;
+ else
+ prio = 0;
+
+ add_to_known_names(all ? path + 5 : path + 10, peeled.hash, prio, oid->hash);
+ return 0;
+}
+
+struct possible_tag {
+ struct commit_name *name;
+ int depth;
+ int found_order;
+ unsigned flag_within;
+};
+
+static int compare_pt(const void *a_, const void *b_)
+{
+ struct possible_tag *a = (struct possible_tag *)a_;
+ struct possible_tag *b = (struct possible_tag *)b_;
+ if (a->depth != b->depth)
+ return a->depth - b->depth;
+ if (a->found_order != b->found_order)
+ return a->found_order - b->found_order;
+ return 0;
+}
+
+static unsigned long finish_depth_computation(
+ struct commit_list **list,
+ struct possible_tag *best)
+{
+ unsigned long seen_commits = 0;
+ while (*list) {
+ struct commit *c = pop_commit(list);
+ struct commit_list *parents = c->parents;
+ seen_commits++;
+ if (c->object.flags & best->flag_within) {
+ struct commit_list *a = *list;
+ while (a) {
+ struct commit *i = a->item;
+ if (!(i->object.flags & best->flag_within))
+ break;
+ a = a->next;
+ }
+ if (!a)
+ break;
+ } else
+ best->depth++;
+ while (parents) {
+ struct commit *p = parents->item;
+ parse_commit(p);
+ if (!(p->object.flags & SEEN))
+ commit_list_insert_by_date(p, list);
+ p->object.flags |= c->object.flags;
+ parents = parents->next;
+ }
+ }
+ return seen_commits;
+}
+
+static void display_name(struct commit_name *n)
+{
+ if (n->prio == 2 && !n->tag) {
+ n->tag = lookup_tag(n->sha1);
+ if (!n->tag || parse_tag(n->tag))
+ die(_("annotated tag %s not available"), n->path);
+ }
+ if (n->tag && !n->name_checked) {
+ if (!n->tag->tag)
+ die(_("annotated tag %s has no embedded name"), n->path);
+ if (strcmp(n->tag->tag, all ? n->path + 5 : n->path))
+ warning(_("tag '%s' is really '%s' here"), n->tag->tag, n->path);
+ n->name_checked = 1;
+ }
+
+ if (n->tag)
+ printf("%s", n->tag->tag);
+ else
+ printf("%s", n->path);
+}
+
+static void show_suffix(int depth, const unsigned char *sha1)
+{
+ printf("-%d-g%s", depth, find_unique_abbrev(sha1, abbrev));
+}
+
+static void describe(const char *arg, int last_one)
+{
+ unsigned char sha1[20];
+ struct commit *cmit, *gave_up_on = NULL;
+ struct commit_list *list;
+ struct commit_name *n;
+ struct possible_tag all_matches[MAX_TAGS];
+ unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
+ unsigned long seen_commits = 0;
+ unsigned int unannotated_cnt = 0;
+
+ if (get_sha1(arg, sha1))
+ die(_("Not a valid object name %s"), arg);
+ cmit = lookup_commit_reference(sha1);
+ if (!cmit)
+ die(_("%s is not a valid '%s' object"), arg, commit_type);
+
+ n = find_commit_name(cmit->object.oid.hash);
+ if (n && (tags || all || n->prio == 2)) {
+ /*
+ * Exact match to an existing ref.
+ */
+ display_name(n);
+ if (longformat)
+ show_suffix(0, n->tag ? n->tag->tagged->oid.hash : sha1);
+ if (dirty)
+ printf("%s", dirty);
+ printf("\n");
+ return;
+ }
+
+ if (!max_candidates)
+ die(_("no tag exactly matches '%s'"), oid_to_hex(&cmit->object.oid));
+ if (debug)
+ fprintf(stderr, _("searching to describe %s\n"), arg);
+
+ if (!have_util) {
+ struct hashmap_iter iter;
+ struct commit *c;
+ struct commit_name *n = hashmap_iter_first(&names, &iter);
+ for (; n; n = hashmap_iter_next(&iter)) {
+ c = lookup_commit_reference_gently(n->peeled, 1);
+ if (c)
+ c->util = n;
+ }
+ have_util = 1;
+ }
+
+ list = NULL;
+ cmit->object.flags = SEEN;
+ commit_list_insert(cmit, &list);
+ while (list) {
+ struct commit *c = pop_commit(&list);
+ struct commit_list *parents = c->parents;
+ seen_commits++;
+ n = c->util;
+ if (n) {
+ if (!tags && !all && n->prio < 2) {
+ unannotated_cnt++;
+ } else if (match_cnt < max_candidates) {
+ struct possible_tag *t = &all_matches[match_cnt++];
+ t->name = n;
+ t->depth = seen_commits - 1;
+ t->flag_within = 1u << match_cnt;
+ t->found_order = match_cnt;
+ c->object.flags |= t->flag_within;
+ if (n->prio == 2)
+ annotated_cnt++;
+ }
+ else {
+ gave_up_on = c;
+ break;
+ }
+ }
+ for (cur_match = 0; cur_match < match_cnt; cur_match++) {
+ struct possible_tag *t = &all_matches[cur_match];
+ if (!(c->object.flags & t->flag_within))
+ t->depth++;
+ }
+ if (annotated_cnt && !list) {
+ if (debug)
+ fprintf(stderr, _("finished search at %s\n"),
+ oid_to_hex(&c->object.oid));
+ break;
+ }
+ while (parents) {
+ struct commit *p = parents->item;
+ parse_commit(p);
+ if (!(p->object.flags & SEEN))
+ commit_list_insert_by_date(p, &list);
+ p->object.flags |= c->object.flags;
+ parents = parents->next;
+
+ if (first_parent)
+ break;
+ }
+ }
+
+ if (!match_cnt) {
+ struct object_id *oid = &cmit->object.oid;
+ if (always) {
+ printf("%s", find_unique_abbrev(oid->hash, abbrev));
+ if (dirty)
+ printf("%s", dirty);
+ printf("\n");
+ return;
+ }
+ if (unannotated_cnt)
+ die(_("No annotated tags can describe '%s'.\n"
+ "However, there were unannotated tags: try --tags."),
+ oid_to_hex(oid));
+ else
+ die(_("No tags can describe '%s'.\n"
+ "Try --always, or create some tags."),
+ oid_to_hex(oid));
+ }
+
+ qsort(all_matches, match_cnt, sizeof(all_matches[0]), compare_pt);
+
+ if (gave_up_on) {
+ commit_list_insert_by_date(gave_up_on, &list);
+ seen_commits--;
+ }
+ seen_commits += finish_depth_computation(&list, &all_matches[0]);
+ free_commit_list(list);
+
+ if (debug) {
+ for (cur_match = 0; cur_match < match_cnt; cur_match++) {
+ struct possible_tag *t = &all_matches[cur_match];
+ fprintf(stderr, " %-11s %8d %s\n",
+ prio_names[t->name->prio],
+ t->depth, t->name->path);
+ }
+ fprintf(stderr, _("traversed %lu commits\n"), seen_commits);
+ if (gave_up_on) {
+ fprintf(stderr,
+ _("more than %i tags found; listed %i most recent\n"
+ "gave up search at %s\n"),
+ max_candidates, max_candidates,
+ oid_to_hex(&gave_up_on->object.oid));
+ }
+ }
+
+ display_name(all_matches[0].name);
+ if (abbrev)
+ show_suffix(all_matches[0].depth, cmit->object.oid.hash);
+ if (dirty)
+ printf("%s", dirty);
+ printf("\n");
+
+ if (!last_one)
+ clear_commit_marks(cmit, -1);
+}
+
+int cmd_describe(int argc, const char **argv, const char *prefix)
+{
+ int contains = 0;
+ struct option options[] = {
+ OPT_BOOL(0, "contains", &contains, N_("find the tag that comes after the commit")),
+ OPT_BOOL(0, "debug", &debug, N_("debug search strategy on stderr")),
+ OPT_BOOL(0, "all", &all, N_("use any ref")),
+ OPT_BOOL(0, "tags", &tags, N_("use any tag, even unannotated")),
+ OPT_BOOL(0, "long", &longformat, N_("always use long format")),
+ OPT_BOOL(0, "first-parent", &first_parent, N_("only follow first parent")),
+ OPT__ABBREV(&abbrev),
+ OPT_SET_INT(0, "exact-match", &max_candidates,
+ N_("only output exact matches"), 0),
+ OPT_INTEGER(0, "candidates", &max_candidates,
+ N_("consider <n> most recent tags (default: 10)")),
+ OPT_STRING(0, "match", &pattern, N_("pattern"),
+ N_("only consider tags matching <pattern>")),
+ OPT_BOOL(0, "always", &always,
+ N_("show abbreviated commit object as fallback")),
+ {OPTION_STRING, 0, "dirty", &dirty, N_("mark"),
+ N_("append <mark> on dirty working tree (default: \"-dirty\")"),
+ PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
+ OPT_END(),
+ };
+
+ git_config(git_default_config, NULL);
+ argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
+ if (abbrev < 0)
+ abbrev = DEFAULT_ABBREV;
+
+ if (max_candidates < 0)
+ max_candidates = 0;
+ else if (max_candidates > MAX_TAGS)
+ max_candidates = MAX_TAGS;
+
+ save_commit_buffer = 0;
+
+ if (longformat && abbrev == 0)
+ die(_("--long is incompatible with --abbrev=0"));
+
+ if (contains) {
+ struct argv_array args;
+
+ argv_array_init(&args);
+ argv_array_pushl(&args, "name-rev",
+ "--peel-tag", "--name-only", "--no-undefined",
+ NULL);
+ if (always)
+ argv_array_push(&args, "--always");
+ if (!all) {
+ argv_array_push(&args, "--tags");
+ if (pattern)
+ argv_array_pushf(&args, "--refs=refs/tags/%s", pattern);
+ }
+ if (argc)
+ argv_array_pushv(&args, argv);
+ else
+ argv_array_push(&args, "HEAD");
+ return cmd_name_rev(args.argc, args.argv, prefix);
+ }
+
+ hashmap_init(&names, (hashmap_cmp_fn) commit_name_cmp, 0);
+ for_each_rawref(get_name, NULL);
+ if (!names.size && !always)
+ die(_("No names found, cannot describe anything."));
+
+ if (argc == 0) {
+ if (dirty) {
+ static struct lock_file index_lock;
+ int fd;
+
+ read_cache_preload(NULL);
+ refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED,
+ NULL, NULL, NULL);
+ fd = hold_locked_index(&index_lock, 0);
+ if (0 <= fd)
+ update_index_if_able(&the_index, &index_lock);
+
+ if (!cmd_diff_index(ARRAY_SIZE(diff_index_args) - 1,
+ diff_index_args, prefix))
+ dirty = NULL;
+ }
+ describe("HEAD", 1);
+ } else if (dirty) {
+ die(_("--dirty is incompatible with commit-ishes"));
+ } else {
+ while (argc-- > 0)
+ describe(*argv++, argc == 0);
+ }
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-18 13:45:02 +0000