mirror of
https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Allan Caffee](/assets/img/avatar_default.png)
When running git describe --dirty the index should be refreshed. Previously the cached index would cause describe to think that the index was dirty when, in reality, it was just stale. The issue was exposed by python setuptools which hardlinks files into another directory when building a distribution. Signed-off-by: Junio C Hamano <gitster@pobox.com>
490 lines
12 KiB
C
490 lines
12 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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#include "diff.h"
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#include "hash.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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"git describe [options] --dirty",
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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; /* Any valid ref can be used */
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static int tags; /* Allow lightweight tags */
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static int longformat;
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static int abbrev = -1; /* unspecified */
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static int max_candidates = 10;
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static struct hash_table names;
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static int have_util;
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static const char *pattern;
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static int always;
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static const char *dirty;
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/* diff-index command arguments to check if working tree is dirty. */
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static const char *diff_index_args[] = {
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"diff-index", "--quiet", "HEAD", "--", NULL
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};
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struct commit_name {
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struct commit_name *next;
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unsigned char peeled[20];
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struct tag *tag;
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unsigned prio:2; /* annotated tag = 2, tag = 1, head = 0 */
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unsigned name_checked:1;
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unsigned char sha1[20];
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const char *path;
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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 inline unsigned int hash_sha1(const unsigned char *sha1)
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{
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unsigned int hash;
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memcpy(&hash, sha1, sizeof(hash));
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return hash;
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}
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static inline struct commit_name *find_commit_name(const unsigned char *peeled)
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{
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struct commit_name *n = lookup_hash(hash_sha1(peeled), &names);
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while (n && !!hashcmp(peeled, n->peeled))
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n = n->next;
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return n;
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}
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static int set_util(void *chain, void *data)
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{
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struct commit_name *n;
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for (n = chain; n; n = n->next) {
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struct commit *c = lookup_commit_reference_gently(n->peeled, 1);
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if (c)
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c->util = n;
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}
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return 0;
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}
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static int replace_name(struct commit_name *e,
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int prio,
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const unsigned char *sha1,
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struct tag **tag)
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{
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if (!e || e->prio < prio)
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return 1;
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if (e->prio == 2 && prio == 2) {
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/* Multiple annotated tags point to the same commit.
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* Select one to keep based upon their tagger date.
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*/
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struct tag *t;
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if (!e->tag) {
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t = lookup_tag(e->sha1);
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if (!t || parse_tag(t))
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return 1;
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e->tag = t;
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}
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t = lookup_tag(sha1);
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if (!t || parse_tag(t))
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return 0;
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*tag = t;
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if (e->tag->date < t->date)
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return 1;
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}
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return 0;
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}
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static void add_to_known_names(const char *path,
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const unsigned char *peeled,
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int prio,
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const unsigned char *sha1)
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{
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struct commit_name *e = find_commit_name(peeled);
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struct tag *tag = NULL;
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if (replace_name(e, prio, sha1, &tag)) {
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if (!e) {
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void **pos;
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e = xmalloc(sizeof(struct commit_name));
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hashcpy(e->peeled, peeled);
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pos = insert_hash(hash_sha1(peeled), e, &names);
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if (pos) {
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e->next = *pos;
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*pos = e;
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} else {
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e->next = NULL;
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}
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}
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e->tag = tag;
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e->prio = prio;
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e->name_checked = 0;
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hashcpy(e->sha1, sha1);
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e->path = path;
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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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int might_be_tag = !prefixcmp(path, "refs/tags/");
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unsigned char peeled[20];
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int is_tag, prio;
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if (!all && !might_be_tag)
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return 0;
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if (!peel_ref(path, peeled) && !is_null_sha1(peeled)) {
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is_tag = !!hashcmp(sha1, peeled);
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} else {
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hashcpy(peeled, sha1);
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is_tag = 0;
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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 (might_be_tag) {
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if (is_tag)
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prio = 2;
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else
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prio = 1;
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if (pattern && fnmatch(pattern, path + 10, 0))
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prio = 0;
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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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}
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add_to_known_names(all ? path + 5 : path + 10, peeled, prio, sha1);
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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->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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commit_list_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 display_name(struct commit_name *n)
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{
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if (n->prio == 2 && !n->tag) {
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n->tag = lookup_tag(n->sha1);
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if (!n->tag || parse_tag(n->tag))
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die(_("annotated tag %s not available"), n->path);
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}
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if (n->tag && !n->name_checked) {
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if (!n->tag->tag)
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die(_("annotated tag %s has no embedded name"), n->path);
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if (strcmp(n->tag->tag, all ? n->path + 5 : n->path))
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warning(_("tag '%s' is really '%s' here"), n->tag->tag, n->path);
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n->name_checked = 1;
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}
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if (n->tag)
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printf("%s", n->tag->tag);
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else
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printf("%s", n->path);
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}
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static void show_suffix(int depth, const unsigned char *sha1)
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{
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printf("-%d-g%s", depth, find_unique_abbrev(sha1, abbrev));
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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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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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unsigned int unannotated_cnt = 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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n = find_commit_name(cmit->object.sha1);
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if (n && (tags || all || n->prio == 2)) {
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/*
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* Exact match to an existing ref.
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*/
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display_name(n);
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if (longformat)
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show_suffix(0, n->tag ? n->tag->tagged->sha1 : sha1);
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if (dirty)
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printf("%s", dirty);
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printf("\n");
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return;
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}
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if (!max_candidates)
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die(_("no tag exactly matches '%s'"), sha1_to_hex(cmit->object.sha1));
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if (debug)
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fprintf(stderr, _("searching to describe %s\n"), arg);
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if (!have_util) {
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for_each_hash(&names, set_util, NULL);
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have_util = 1;
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}
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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 (!tags && !all && n->prio < 2) {
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unannotated_cnt++;
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} else 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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commit_list_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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const unsigned char *sha1 = cmit->object.sha1;
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if (always) {
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printf("%s", find_unique_abbrev(sha1, abbrev));
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if (dirty)
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printf("%s", dirty);
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printf("\n");
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return;
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}
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if (unannotated_cnt)
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die(_("No annotated tags can describe '%s'.\n"
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"However, there were unannotated tags: try --tags."),
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sha1_to_hex(sha1));
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else
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die(_("No tags can describe '%s'.\n"
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"Try --always, or create some tags."),
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sha1_to_hex(sha1));
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}
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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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commit_list_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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display_name(all_matches[0].name);
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if (abbrev)
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show_suffix(all_matches[0].depth, cmit->object.sha1);
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if (dirty)
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printf("%s", dirty);
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printf("\n");
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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_BOOLEAN(0, "long", &longformat, "always use long format"),
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OPT__ABBREV(&abbrev),
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OPT_SET_INT(0, "exact-match", &max_candidates,
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"only output exact matches", 0),
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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_BOOLEAN(0, "always", &always,
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"show abbreviated commit object as fallback"),
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{OPTION_STRING, 0, "dirty", &dirty, "mark",
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"append <mark> on dirty working tree (default: \"-dirty\")",
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PARSE_OPT_OPTARG, NULL, (intptr_t) "-dirty"},
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OPT_END(),
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
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if (abbrev < 0)
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abbrev = DEFAULT_ABBREV;
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if (max_candidates < 0)
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max_candidates = 0;
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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 (longformat && abbrev == 0)
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die(_("--long is incompatible with --abbrev=0"));
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if (contains) {
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const char **args = xmalloc((7 + 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 (always)
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args[i++] = "--always";
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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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init_hash(&names);
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for_each_rawref(get_name, NULL);
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if (!names.nr && !always)
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die(_("No names found, cannot describe anything."));
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if (argc == 0) {
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if (dirty) {
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static struct lock_file index_lock;
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int fd;
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read_cache_preload(NULL);
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refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED,
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NULL, NULL, NULL);
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fd = hold_locked_index(&index_lock, 0);
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if (0 <= fd)
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update_index_if_able(&the_index, &index_lock);
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if (!cmd_diff_index(ARRAY_SIZE(diff_index_args) - 1,
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diff_index_args, prefix))
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dirty = NULL;
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}
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describe("HEAD", 1);
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} else if (dirty) {
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die(_("--dirty is incompatible with committishes"));
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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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