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authorKevin Bracey <kevin@bracey.fi>2013-05-16 18:32:36 +0300
committerJunio C Hamano <gitster@pobox.com>2013-05-16 11:51:09 -0700
commit9c129eab99f16d7bb174b35573e68ae6a5d02efe (patch)
treeec1b25ac5a95875ef49d1d0d9c80154dfec19cc3 /revision.c
parentd5d2fc8b1a2afdd086b194b2a834e896367d6713 (diff)
downloadgit-9c129eab99f16d7bb174b35573e68ae6a5d02efe.tar.gz
simplify-merges: never remove all TREESAME parents
When simplifying an odd merge, such as one that used "-s ours", we may find ourselves TREESAME to apparently redundant parents. Prevent simplify_merges() from removing every TREESAME parent; if this would happen reinstate the first TREESAME parent - the one that the default log would have followed. This avoids producing a totally disjoint history from the default log when the default log is a better explanation of the end result, and aids visualisation of odd merges. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'revision.c')
-rw-r--r--revision.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/revision.c b/revision.c
index 64b86ae91e..62f399c22f 100644
--- a/revision.c
+++ b/revision.c
@@ -2136,6 +2136,73 @@ static int mark_redundant_parents(struct rev_info *revs, struct commit *commit)
return marked;
}
+/*
+ * Awkward naming - this means one parent we are TREESAME to.
+ * cf mark_treesame_root_parents: root parents that are TREESAME (to an
+ * empty tree). Better name suggestions?
+ */
+static int leave_one_treesame_to_parent(struct rev_info *revs, struct commit *commit)
+{
+ struct treesame_state *ts = lookup_decoration(&revs->treesame, &commit->object);
+ struct commit *unmarked = NULL, *marked = NULL;
+ struct commit_list *p;
+ unsigned n;
+
+ for (p = commit->parents, n = 0; p; p = p->next, n++) {
+ if (ts->treesame[n]) {
+ if (p->item->object.flags & TMP_MARK) {
+ if (!marked)
+ marked = p->item;
+ } else {
+ if (!unmarked) {
+ unmarked = p->item;
+ break;
+ }
+ }
+ }
+ }
+
+ /*
+ * If we are TREESAME to a marked-for-deletion parent, but not to any
+ * unmarked parents, unmark the first TREESAME parent. This is the
+ * parent that the default simplify_history==1 scan would have followed,
+ * and it doesn't make sense to omit that path when asking for a
+ * simplified full history. Retaining it improves the chances of
+ * understanding odd missed merges that took an old version of a file.
+ *
+ * Example:
+ *
+ * I--------*X A modified the file, but mainline merge X used
+ * \ / "-s ours", so took the version from I. X is
+ * `-*A--' TREESAME to I and !TREESAME to A.
+ *
+ * Default log from X would produce "I". Without this check,
+ * --full-history --simplify-merges would produce "I-A-X", showing
+ * the merge commit X and that it changed A, but not making clear that
+ * it had just taken the I version. With this check, the topology above
+ * is retained.
+ *
+ * Note that it is possible that the simplification chooses a different
+ * TREESAME parent from the default, in which case this test doesn't
+ * activate, and we _do_ drop the default parent. Example:
+ *
+ * I------X A modified the file, but it was reverted in B,
+ * \ / meaning mainline merge X is TREESAME to both
+ * *A-*B parents.
+ *
+ * Default log would produce "I" by following the first parent;
+ * --full-history --simplify-merges will produce "I-A-B". But this is a
+ * reasonable result - it presents a logical full history leading from
+ * I to X, and X is not an important merge.
+ */
+ if (!unmarked && marked) {
+ marked->object.flags &= ~TMP_MARK;
+ return 1;
+ }
+
+ return 0;
+}
+
static int remove_marked_parents(struct rev_info *revs, struct commit *commit)
{
struct commit_list **pp, *p;
@@ -2239,6 +2306,8 @@ static struct commit_list **simplify_one(struct rev_info *revs, struct commit *c
if (1 < cnt) {
int marked = mark_redundant_parents(revs, commit);
if (marked)
+ marked -= leave_one_treesame_to_parent(revs, commit);
+ if (marked)
cnt = remove_marked_parents(revs, commit);
}