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Merge branch 'js/name-rev-use-oldest-ref' into maint
"git describe --contains" often made a hard-to-justify choice of tag to give name to a given commit, because it tried to come up with a name with smallest number of hops from a tag, causing an old commit whose close descendant that is recently tagged were not described with respect to an old tag but with a newer tag. It did not help that its computation of "hop" count was further tweaked to penalize being on a side branch of a merge. The logic has been updated to favor using the tag with the oldest tagger date, which is a lot easier to explain to the end users: "We describe a commit in terms of the (chronologically) oldest tag that contains the commit." * js/name-rev-use-oldest-ref: name-rev: include taggerdate in considering the best name
This commit is contained in:
commit
9ee8f9409c
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@ -10,6 +10,7 @@
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typedef struct rev_name {
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const char *tip_name;
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unsigned long taggerdate;
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int generation;
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int distance;
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} rev_name;
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@ -20,7 +21,8 @@ static long cutoff = LONG_MAX;
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#define MERGE_TRAVERSAL_WEIGHT 65535
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static void name_rev(struct commit *commit,
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const char *tip_name, int generation, int distance,
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const char *tip_name, unsigned long taggerdate,
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int generation, int distance,
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int deref)
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{
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struct rev_name *name = (struct rev_name *)commit->util;
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@ -43,9 +45,12 @@ static void name_rev(struct commit *commit,
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name = xmalloc(sizeof(rev_name));
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commit->util = name;
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goto copy_data;
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} else if (name->distance > distance) {
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} else if (name->taggerdate > taggerdate ||
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(name->taggerdate == taggerdate &&
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name->distance > distance)) {
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copy_data:
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name->tip_name = tip_name;
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name->taggerdate = taggerdate;
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name->generation = generation;
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name->distance = distance;
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} else
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@ -66,11 +71,11 @@ static void name_rev(struct commit *commit,
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new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
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parent_number);
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name_rev(parents->item, new_name, 0,
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name_rev(parents->item, new_name, taggerdate, 0,
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distance + MERGE_TRAVERSAL_WEIGHT, 0);
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} else {
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name_rev(parents->item, tip_name, generation + 1,
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distance + 1, 0);
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name_rev(parents->item, tip_name, taggerdate,
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generation + 1, distance + 1, 0);
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}
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}
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}
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@ -140,6 +145,7 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
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struct name_ref_data *data = cb_data;
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int can_abbreviate_output = data->tags_only && data->name_only;
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int deref = 0;
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unsigned long taggerdate = ULONG_MAX;
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if (data->tags_only && !starts_with(path, "refs/tags/"))
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return 0;
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@ -164,12 +170,13 @@ static int name_ref(const char *path, const struct object_id *oid, int flags, vo
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break; /* broken repository */
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o = parse_object(t->tagged->oid.hash);
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deref = 1;
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taggerdate = t->date;
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}
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if (o && o->type == OBJ_COMMIT) {
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struct commit *commit = (struct commit *)o;
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path = name_ref_abbrev(path, can_abbreviate_output);
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name_rev(commit, xstrdup(path), 0, 0, deref);
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name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref);
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}
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return 0;
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}
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@ -107,7 +107,7 @@ test_expect_success 'prompt - describe detached head - contains' '
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'
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test_expect_success 'prompt - describe detached head - branch' '
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printf " ((b1~1))" >expected &&
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printf " ((tags/t2~1))" >expected &&
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git checkout b1^ &&
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test_when_finished "git checkout master" &&
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(
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