#include "cache.h" #include "commit.h" #include "tag.h" #include "refs.h" #include "builtin.h" #include "exec_cmd.h" #include "parse-options.h" #define SEEN (1u<<0) #define MAX_TAGS (FLAG_BITS - 1) static const char * const describe_usage[] = { "git describe [options] <committish>*", 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 abbrev = DEFAULT_ABBREV; static int max_candidates = 10; static const char *pattern; static int always; struct commit_name { struct tag *tag; int prio; /* annotated tag = 2, tag = 1, head = 0 */ unsigned char sha1[20]; char path[FLEX_ARRAY]; /* more */ }; static const char *prio_names[] = { "head", "lightweight", "annotated", }; static void add_to_known_names(const char *path, struct commit *commit, int prio, const unsigned char *sha1) { struct commit_name *e = commit->util; if (!e || e->prio < prio) { size_t len = strlen(path)+1; free(e); e = xmalloc(sizeof(struct commit_name) + len); e->tag = NULL; e->prio = prio; hashcpy(e->sha1, sha1); memcpy(e->path, path, len); commit->util = e; } } static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data) { int might_be_tag = !prefixcmp(path, "refs/tags/"); struct commit *commit; struct object *object; unsigned char peeled[20]; int is_tag, prio; if (!all && !might_be_tag) return 0; if (!peel_ref(path, peeled) && !is_null_sha1(peeled)) { commit = lookup_commit_reference_gently(peeled, 1); if (!commit) return 0; is_tag = !!hashcmp(sha1, commit->object.sha1); } else { commit = lookup_commit_reference_gently(sha1, 1); object = parse_object(sha1); if (!commit || !object) return 0; is_tag = object->type == OBJ_TAG; } /* If --all, then any refs are used. * If --tags, then any tags are used. * Otherwise only annotated tags are used. */ if (might_be_tag) { if (is_tag) prio = 2; else prio = 1; if (pattern && fnmatch(pattern, path + 10, 0)) prio = 0; } else prio = 0; if (!all) { if (!prio) return 0; if (!tags && prio < 2) return 0; } add_to_known_names(all ? path + 5 : path + 10, commit, prio, sha1); 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)) 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) || !n->tag->tag) die("annotated tag %s not available", 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); } 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; static int initialized = 0; 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; 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); if (!initialized) { initialized = 1; for_each_ref(get_name, NULL); } n = cmit->util; if (n) { /* * Exact match to an existing ref. */ display_name(n); if (longformat) show_suffix(0, n->tag ? n->tag->tagged->sha1 : sha1); printf("\n"); return; } if (!max_candidates) die("no tag exactly matches '%s'", sha1_to_hex(cmit->object.sha1)); if (debug) fprintf(stderr, "searching to describe %s\n", arg); 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 (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", sha1_to_hex(c->object.sha1)); break; } while (parents) { struct commit *p = parents->item; parse_commit(p); if (!(p->object.flags & SEEN)) insert_by_date(p, &list); p->object.flags |= c->object.flags; parents = parents->next; } } if (!match_cnt) { const unsigned char *sha1 = cmit->object.sha1; if (always) { printf("%s\n", find_unique_abbrev(sha1, abbrev)); return; } die("cannot describe '%s'", sha1_to_hex(sha1)); } qsort(all_matches, match_cnt, sizeof(all_matches[0]), compare_pt); if (gave_up_on) { 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, sha1_to_hex(gave_up_on->object.sha1)); } } display_name(all_matches[0].name); if (abbrev) show_suffix(all_matches[0].depth, cmit->object.sha1); 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_BOOLEAN(0, "contains", &contains, "find the tag that comes after the commit"), OPT_BOOLEAN(0, "debug", &debug, "debug search strategy on stderr"), OPT_BOOLEAN(0, "all", &all, "use any ref in .git/refs"), OPT_BOOLEAN(0, "tags", &tags, "use any tag in .git/refs/tags"), OPT_BOOLEAN(0, "long", &longformat, "always use long format"), OPT__ABBREV(&abbrev), OPT_SET_INT(0, "exact-match", &max_candidates, "only output exact matches", 0), OPT_INTEGER(0, "candidates", &max_candidates, "consider <n> most recent tags (default: 10)"), OPT_STRING(0, "match", &pattern, "pattern", "only consider tags matching <pattern>"), OPT_BOOLEAN(0, "always", &always, "show abbreviated commit object as fallback"), OPT_END(), }; argc = parse_options(argc, argv, options, describe_usage, 0); 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) { const char **args = xmalloc((7 + argc) * sizeof(char*)); int i = 0; args[i++] = "name-rev"; args[i++] = "--name-only"; args[i++] = "--no-undefined"; if (always) args[i++] = "--always"; if (!all) { args[i++] = "--tags"; if (pattern) { char *s = xmalloc(strlen("--refs=refs/tags/") + strlen(pattern) + 1); sprintf(s, "--refs=refs/tags/%s", pattern); args[i++] = s; } } memcpy(args + i, argv, argc * sizeof(char*)); args[i + argc] = NULL; return cmd_name_rev(i + argc, args, prefix); } if (argc == 0) { describe("HEAD", 1); } else { while (argc-- > 0) { describe(*argv++, argc == 0); } } return 0; }