Use lookup_commit instead of parse_object to look up commits mentioned
in the reflog. This avoids a segfault in save_parents if somehow a sha1
for something other than a commit ends up in the reflog.
Signed-off-by: Dennis Kaarsemaker <den...@kaarsemaker.net>
Helped-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
Helped-by: Junio C Hamano <gits...@pobox.com>
---
reflog-walk.c | 7 +++++--
t/t1410-reflog.sh | 13 +++++++++++++
2 files changed, 18 insertions(+), 2 deletions(-)
This version implements Junio's way of doing this, to avoid spurious warnings
and to handle broken commit objects better.
I also added a failing test to show that git reflog still fails to display the
full reflog when it encounters such non-commit objects (it just stops when it
seems them). I don't know how to fix that.
The really correct way of fixing this bug may actually be a level higher, and
making git reflog not rely on information about parent commits, whether they
are fake or not.
diff --git a/reflog-walk.c b/reflog-walk.c
index 85b8a54..861d7c4 100644
--- a/reflog-walk.c
+++ b/reflog-walk.c
@@ -221,6 +221,7 @@ void fake_reflog_parent(struct reflog_walk_info *info,
struct commit *commit)
struct commit_info *commit_info =
get_commit_info(commit, &info->reflogs, 0);
struct commit_reflog *commit_reflog;
+ struct object *logobj;
struct reflog_info *reflog;
info->last_commit_reflog = NULL;
@@ -236,11 +237,13 @@ void fake_reflog_parent(struct reflog_walk_info *info,
struct commit *commit)
reflog = &commit_reflog->reflogs->items[commit_reflog->recno];
info->last_commit_reflog = commit_reflog;
commit_reflog->recno--;
- commit_info->commit = (struct commit *)parse_object(reflog->osha1);
- if (!commit_info->commit) {
+ logobj = parse_object(reflog->osha1);
+ if (!logobj || logobj->type != OBJ_COMMIT) {
+ commit_info->commit = NULL;
commit->parents = NULL;
return;
}
+ commit_info->commit = (struct commit *)logobj;
commit->parents = xcalloc(1, sizeof(struct commit_list));
commit->parents->item = commit_info->commit;
diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index b79049f..130d671 100755
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -325,4 +325,17 @@ test_expect_success 'parsing reverse reflogs at BUFSIZ
boundaries' '
test_cmp expect actual
'
+test_expect_success 'no segfaults for reflog containing non-commit sha1s' '
+ git update-ref --create-reflog -m "Creating ref" \
+ refs/tests/tree-in-reflog HEAD &&
+ git update-ref -m "Forcing tree" refs/tests/tree-in-reflog HEAD^{tree}
&&
+ git update-ref -m "Restoring to commit" refs/tests/tree-in-reflog HEAD
&&
+ git reflog refs/tests/tree-in-reflog
+'
+
+test_expect_failure 'reflog containing non-commit sha1s displays fully' '
+ git reflog refs/tests/tree-in-reflog > actual &&
+ test_line_count = 3 actual
+'
+
test_done
--
2.7.0-rc1-207-ga35084c
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