diff options
Diffstat (limited to 'builtin/describe.c')
| -rw-r--r-- | builtin/describe.c | 496 |
1 files changed, 496 insertions, 0 deletions
diff --git a/builtin/describe.c b/builtin/describe.c new file mode 100644 index 0000000000..7d73722f59 --- /dev/null +++ b/builtin/describe.c @@ -0,0 +1,496 @@ +#include "cache.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 "hash.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] <committish>*"), + 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 hash_table 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 commit_name *next; + 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 inline unsigned int hash_sha1(const unsigned char *sha1) +{ + unsigned int hash; + memcpy(&hash, sha1, sizeof(hash)); + return hash; +} + +static inline struct commit_name *find_commit_name(const unsigned char *peeled) +{ + struct commit_name *n = lookup_hash(hash_sha1(peeled), &names); + while (n && !!hashcmp(peeled, n->peeled)) + n = n->next; + return n; +} + +static int set_util(void *chain, void *data) +{ + struct commit_name *n; + for (n = chain; n; n = n->next) { + struct commit *c = lookup_commit_reference_gently(n->peeled, 1); + if (c) + c->util = n; + } + return 0; +} + +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) { + void **pos; + e = xmalloc(sizeof(struct commit_name)); + hashcpy(e->peeled, peeled); + pos = insert_hash(hash_sha1(peeled), e, &names); + if (pos) { + e->next = *pos; + *pos = e; + } else { + e->next = NULL; + } + 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 unsigned char *sha1, int flag, void *cb_data) +{ + int is_tag = !prefixcmp(path, "refs/tags/"); + unsigned char peeled[20]; + 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 || fnmatch(pattern, path + 10, 0))) + return 0; + + /* Is it annotated? */ + if (!peel_ref(path, peeled)) { + is_annotated = !!hashcmp(sha1, peeled); + } else { + hashcpy(peeled, sha1); + 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, 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)) + 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.sha1); + 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->sha1 : sha1); + if (dirty) + printf("%s", dirty); + 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); + + if (!have_util) { + for_each_hash(&names, set_util, NULL); + 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"), + sha1_to_hex(c->object.sha1)); + 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) { + const unsigned char *sha1 = cmit->object.sha1; + if (always) { + printf("%s", find_unique_abbrev(sha1, 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."), + sha1_to_hex(sha1)); + else + die(_("No tags can describe '%s'.\n" + "Try --always, or create some tags."), + sha1_to_hex(sha1)); + } + + 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, + 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); + 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_BOOLEAN(0, "contains", &contains, N_("find the tag that comes after the commit")), + OPT_BOOLEAN(0, "debug", &debug, N_("debug search strategy on stderr")), + OPT_BOOLEAN(0, "all", &all, N_("use any ref")), + OPT_BOOLEAN(0, "tags", &tags, N_("use any tag, even unannotated")), + OPT_BOOLEAN(0, "long", &longformat, N_("always use long format")), + OPT_BOOLEAN(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_BOOLEAN(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); + } + while (*argv) { + argv_array_push(&args, *argv); + argv++; + } + return cmd_name_rev(args.argc, args.argv, prefix); + } + + init_hash(&names); + for_each_rawref(get_name, NULL); + if (!names.nr && !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 committishes")); + } else { + while (argc-- > 0) { + describe(*argv++, argc == 0); + } + } + return 0; +} |