This makes âgit describe --exact-match HEADâ about 15 times faster on
a cold cache (2.3s instead of 35s) in a linux-2.6 repository with many
packed tags. Thatâs a huge win for the interactivity of the __git_ps1
shell prompt helper when on a detached head.
Signed-off-by: Anders Kaseorg <andersk@xxxxxxxxxxx>
diff --git a/builtin/describe.c b/builtin/describe.c
index 700f740..0cddef1 100644
--- a/builtin/describe.c
+++ b/builtin/describe.c
@@ -22,7 +22,7 @@ static int tags; /* Allow lightweight tags */
static int longformat;
static int abbrev = DEFAULT_ABBREV;
static int max_candidates = 10;
-static int found_names;
+static struct commit_name *names;
static const char *pattern;
static int always;
static const char *dirty;
@@ -34,6 +34,8 @@ static const char *diff_index_args[] = {
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;
@@ -78,31 +80,26 @@ static int replace_name(struct commit_name *e,
}
static void add_to_known_names(const char *path,
- struct commit *commit,
+ const unsigned char *peeled,
int prio,
const unsigned char *sha1)
{
- struct commit_name *e = commit->util;
struct tag *tag = NULL;
- if (replace_name(e, prio, sha1, &tag)) {
- size_t len = strlen(path)+1;
- free(e);
- e = xmalloc(sizeof(struct commit_name) + len);
- e->tag = tag;
- e->prio = prio;
- e->name_checked = 0;
- hashcpy(e->sha1, sha1);
- memcpy(e->path, path, len);
- commit->util = e;
- }
- found_names = 1;
+ size_t len = strlen(path)+1;
+ struct commit_name *e = xmalloc(sizeof(struct commit_name) + len);
+ hashcpy(e->peeled, peeled);
+ e->tag = tag;
+ e->prio = prio;
+ e->name_checked = 0;
+ hashcpy(e->sha1, sha1);
+ memcpy(e->path, path, len);
+ e->next = names;
+ names = 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;
@@ -110,16 +107,10 @@ static int get_name(const char *path, const unsigned char *sha1, int flag, void
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);
+ is_tag = !!hashcmp(sha1, peeled);
} else {
- commit = lookup_commit_reference_gently(sha1, 1);
- object = parse_object(sha1);
- if (!commit || !object)
- return 0;
- is_tag = object->type == OBJ_TAG;
+ hashcpy(peeled, sha1);
+ is_tag = 0;
}
/* If --all, then any refs are used.
@@ -142,7 +133,7 @@ static int get_name(const char *path, const unsigned char *sha1, int flag, void
if (!prio)
return 0;
}
- add_to_known_names(all ? path + 5 : path + 10, commit, prio, sha1);
+ add_to_known_names(all ? path + 5 : path + 10, peeled, prio, sha1);
return 0;
}
@@ -228,7 +219,7 @@ 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 commit_name *n, *e;
struct possible_tag all_matches[MAX_TAGS];
unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
unsigned long seen_commits = 0;
@@ -240,7 +231,12 @@ static void describe(const char *arg, int last_one)
if (!cmit)
die("%s is not a valid '%s' object", arg, commit_type);
- n = cmit->util;
+ n = NULL;
+ for (e = names; e; e = e->next) {
+ if (!hashcmp(e->peeled, cmit->object.sha1) &&
+ replace_name(n, e->prio, e->sha1, &e->tag))
+ n = e;
+ }
if (n && (tags || all || n->prio == 2)) {
/*
* Exact match to an existing ref.
@@ -259,6 +255,12 @@ static void describe(const char *arg, int last_one)
if (debug)
fprintf(stderr, "searching to describe %s\n", arg);
+ for (e = names; e; e = e->next) {
+ struct commit *c = lookup_commit_reference_gently(e->peeled, 1);
+ if (c && replace_name(c->util, e->prio, e->sha1, &e->tag))
+ c->util = e;
+ }
+
list = NULL;
cmit->object.flags = SEEN;
commit_list_insert(cmit, &list);
@@ -419,7 +421,7 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
}
for_each_rawref(get_name, NULL);
- if (!found_names && !always)
+ if (!names && !always)
die("No names found, cannot describe anything.");
if (argc == 0) {
--
1.7.3.3
--
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