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![Shawn O. Pearce](/assets/img/avatar_default.png)
By using the peeled ref information inside of the packed-refs file we can avoid opening tag objects to obtain the commits they reference. This speeds up git-describe when there are a large number of tags in the repository as we have less objects to parse before we can start commit matching. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
312 lines
7.6 KiB
C
312 lines
7.6 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "refs.h"
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#include "builtin.h"
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#include "exec_cmd.h"
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#include "parse-options.h"
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#define SEEN (1u<<0)
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#define MAX_TAGS (FLAG_BITS - 1)
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static const char * const describe_usage[] = {
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"git-describe [options] <committish>*",
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NULL
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};
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static int debug; /* Display lots of verbose info */
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static int all; /* Default to annotated tags only */
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static int tags; /* But allow any tags if --tags is specified */
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static int abbrev = DEFAULT_ABBREV;
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static int max_candidates = 10;
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const char *pattern = NULL;
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struct commit_name {
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int prio; /* annotated tag = 2, tag = 1, head = 0 */
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char path[FLEX_ARRAY]; /* more */
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};
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static const char *prio_names[] = {
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"head", "lightweight", "annotated",
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};
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static void add_to_known_names(const char *path,
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struct commit *commit,
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int prio)
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{
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struct commit_name *e = commit->util;
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if (!e || e->prio < prio) {
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size_t len = strlen(path)+1;
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free(e);
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e = xmalloc(sizeof(struct commit_name) + len);
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e->prio = prio;
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memcpy(e->path, path, len);
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commit->util = e;
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}
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}
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static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct commit *commit;
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struct object *object;
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unsigned char peeled[20];
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int is_tag, prio;
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if (!peel_ref(path, peeled) && !is_null_sha1(peeled)) {
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commit = lookup_commit_reference_gently(peeled, 1);
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if (!commit)
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return 0;
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is_tag = !!hashcmp(sha1, commit->object.sha1);
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} else {
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commit = lookup_commit_reference_gently(sha1, 1);
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object = parse_object(sha1);
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if (!commit || !object)
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return 0;
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is_tag = object->type == OBJ_TAG;
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}
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/* If --all, then any refs are used.
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* If --tags, then any tags are used.
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* Otherwise only annotated tags are used.
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*/
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if (!prefixcmp(path, "refs/tags/")) {
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if (is_tag) {
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prio = 2;
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if (pattern && fnmatch(pattern, path + 10, 0))
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prio = 0;
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} else
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prio = 1;
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}
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else
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prio = 0;
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if (!all) {
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if (!prio)
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return 0;
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if (!tags && prio < 2)
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return 0;
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}
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add_to_known_names(all ? path + 5 : path + 10, commit, prio);
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return 0;
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}
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struct possible_tag {
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struct commit_name *name;
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int depth;
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int found_order;
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unsigned flag_within;
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};
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static int compare_pt(const void *a_, const void *b_)
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{
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struct possible_tag *a = (struct possible_tag *)a_;
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struct possible_tag *b = (struct possible_tag *)b_;
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if (a->name->prio != b->name->prio)
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return b->name->prio - a->name->prio;
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if (a->depth != b->depth)
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return a->depth - b->depth;
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if (a->found_order != b->found_order)
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return a->found_order - b->found_order;
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return 0;
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}
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static unsigned long finish_depth_computation(
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struct commit_list **list,
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struct possible_tag *best)
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{
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unsigned long seen_commits = 0;
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while (*list) {
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struct commit *c = pop_commit(list);
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struct commit_list *parents = c->parents;
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seen_commits++;
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if (c->object.flags & best->flag_within) {
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struct commit_list *a = *list;
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while (a) {
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struct commit *i = a->item;
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if (!(i->object.flags & best->flag_within))
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break;
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a = a->next;
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}
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if (!a)
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break;
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} else
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best->depth++;
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while (parents) {
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struct commit *p = parents->item;
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parse_commit(p);
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if (!(p->object.flags & SEEN))
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insert_by_date(p, list);
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p->object.flags |= c->object.flags;
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parents = parents->next;
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}
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}
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return seen_commits;
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}
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static void describe(const char *arg, int last_one)
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{
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unsigned char sha1[20];
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struct commit *cmit, *gave_up_on = NULL;
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struct commit_list *list;
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static int initialized = 0;
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struct commit_name *n;
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struct possible_tag all_matches[MAX_TAGS];
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unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
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unsigned long seen_commits = 0;
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if (get_sha1(arg, sha1))
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die("Not a valid object name %s", arg);
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cmit = lookup_commit_reference(sha1);
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if (!cmit)
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die("%s is not a valid '%s' object", arg, commit_type);
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if (!initialized) {
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initialized = 1;
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for_each_ref(get_name, NULL);
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}
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n = cmit->util;
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if (n) {
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printf("%s\n", n->path);
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return;
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}
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if (debug)
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fprintf(stderr, "searching to describe %s\n", arg);
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list = NULL;
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cmit->object.flags = SEEN;
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commit_list_insert(cmit, &list);
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while (list) {
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struct commit *c = pop_commit(&list);
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struct commit_list *parents = c->parents;
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seen_commits++;
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n = c->util;
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if (n) {
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if (match_cnt < max_candidates) {
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struct possible_tag *t = &all_matches[match_cnt++];
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t->name = n;
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t->depth = seen_commits - 1;
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t->flag_within = 1u << match_cnt;
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t->found_order = match_cnt;
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c->object.flags |= t->flag_within;
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if (n->prio == 2)
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annotated_cnt++;
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}
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else {
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gave_up_on = c;
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break;
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}
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}
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for (cur_match = 0; cur_match < match_cnt; cur_match++) {
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struct possible_tag *t = &all_matches[cur_match];
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if (!(c->object.flags & t->flag_within))
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t->depth++;
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}
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if (annotated_cnt && !list) {
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if (debug)
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fprintf(stderr, "finished search at %s\n",
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sha1_to_hex(c->object.sha1));
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break;
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}
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while (parents) {
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struct commit *p = parents->item;
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parse_commit(p);
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if (!(p->object.flags & SEEN))
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insert_by_date(p, &list);
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p->object.flags |= c->object.flags;
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parents = parents->next;
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}
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}
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if (!match_cnt)
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die("cannot describe '%s'", sha1_to_hex(cmit->object.sha1));
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qsort(all_matches, match_cnt, sizeof(all_matches[0]), compare_pt);
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if (gave_up_on) {
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insert_by_date(gave_up_on, &list);
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seen_commits--;
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}
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seen_commits += finish_depth_computation(&list, &all_matches[0]);
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free_commit_list(list);
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if (debug) {
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for (cur_match = 0; cur_match < match_cnt; cur_match++) {
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struct possible_tag *t = &all_matches[cur_match];
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fprintf(stderr, " %-11s %8d %s\n",
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prio_names[t->name->prio],
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t->depth, t->name->path);
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}
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fprintf(stderr, "traversed %lu commits\n", seen_commits);
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if (gave_up_on) {
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fprintf(stderr,
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"more than %i tags found; listed %i most recent\n"
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"gave up search at %s\n",
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max_candidates, max_candidates,
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sha1_to_hex(gave_up_on->object.sha1));
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}
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}
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if (abbrev == 0)
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printf("%s\n", all_matches[0].name->path );
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else
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printf("%s-%d-g%s\n", all_matches[0].name->path,
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all_matches[0].depth,
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find_unique_abbrev(cmit->object.sha1, abbrev));
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if (!last_one)
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clear_commit_marks(cmit, -1);
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}
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int cmd_describe(int argc, const char **argv, const char *prefix)
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{
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int contains = 0;
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struct option options[] = {
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OPT_BOOLEAN(0, "contains", &contains, "find the tag that comes after the commit"),
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OPT_BOOLEAN(0, "debug", &debug, "debug search strategy on stderr"),
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OPT_BOOLEAN(0, "all", &all, "use any ref in .git/refs"),
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OPT_BOOLEAN(0, "tags", &tags, "use any tag in .git/refs/tags"),
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OPT__ABBREV(&abbrev),
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OPT_INTEGER(0, "candidates", &max_candidates,
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"consider <n> most recent tags (default: 10)"),
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OPT_STRING(0, "match", &pattern, "pattern",
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"only consider tags matching <pattern>"),
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OPT_END(),
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};
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argc = parse_options(argc, argv, options, describe_usage, 0);
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if (max_candidates < 1)
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max_candidates = 1;
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else if (max_candidates > MAX_TAGS)
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max_candidates = MAX_TAGS;
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save_commit_buffer = 0;
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if (contains) {
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const char **args = xmalloc((6 + argc) * sizeof(char*));
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int i = 0;
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args[i++] = "name-rev";
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args[i++] = "--name-only";
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args[i++] = "--no-undefined";
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if (!all) {
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args[i++] = "--tags";
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if (pattern) {
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char *s = xmalloc(strlen("--refs=refs/tags/") + strlen(pattern) + 1);
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sprintf(s, "--refs=refs/tags/%s", pattern);
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args[i++] = s;
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}
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}
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memcpy(args + i, argv, argc * sizeof(char*));
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args[i + argc] = NULL;
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return cmd_name_rev(i + argc, args, prefix);
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}
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if (argc == 0) {
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describe("HEAD", 1);
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} else {
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while (argc-- > 0) {
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describe(*argv++, argc == 0);
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}
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}
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return 0;
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}
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