On Mon, Aug 17, 2015 at 10:01:29AM +0200, Johannes Schindelin wrote:
> Hi Linus,
>
> On 2015-08-17 01:33, Linus Torvalds wrote:
> > On Sun, Aug 16, 2015 at 12:46 PM, Linus Torvalds
> > <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> >>
> >> Maybe it has always done this, and I just haven't noticed (I usually
> >> _just_ do the "git reset --hard" thing, don't ask me why I wanted to
> >> be doubly sure this time). But maybe it's an effect of the new
> >> built-in "am".
> >
> > I bisected this. It's definitely used to work, and the regression is
> > from the new built-in am.
>
> This patch is a reproducer:
Thanks Johannes for the test, and sorry all for the oversight. ><
It's true that we need to merge the ORIG_HEAD tree into the index
instead of overwriting it. Patch below.
Regards,
Paul
-- >8 --
Subject: [PATCH] am --abort: merge ORIG_HEAD tree into index
After running "git am --abort", and then running "git reset --hard",
files that were not modified would still be re-checked out.
This is because clean_index() in builtin/am.c mistakenly called the
read_tree() function, which overwrites all entries in the index,
including the stat info.
Fix this by using unpack_trees() instead to merge the tree into the
index, so that the stat info from the index is kept.
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Signed-off-by: Paul Tan <pyokagan@xxxxxxxxx>
---
builtin/am.c | 49 ++++++++++++++++++++++++++++++++++++-------------
t/t4151-am-abort.sh | 12 ++++++++++++
2 files changed, 48 insertions(+), 13 deletions(-)
diff --git a/builtin/am.c b/builtin/am.c
index 1399c8d..6aaa85d 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1940,15 +1940,48 @@ static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
}
/**
+ * Merges a tree into the index. The index's stat info will take precedence
+ * over the merged tree's. Returns 0 on success, -1 on failure.
+ */
+static int merge_tree(struct tree *tree)
+{
+ struct lock_file *lock_file;
+ struct unpack_trees_options opts;
+ struct tree_desc t[2];
+
+ if (parse_tree(tree))
+ return -1;
+
+ lock_file = xcalloc(1, sizeof(struct lock_file));
+ hold_locked_index(lock_file, 1);
+
+ memset(&opts, 0, sizeof(opts));
+ opts.head_idx = 1;
+ opts.src_index = &the_index;
+ opts.dst_index = &the_index;
+ opts.merge = 1;
+ opts.fn = oneway_merge;
+ init_tree_desc(&t[0], tree->buffer, tree->size);
+
+ if (unpack_trees(1, t, &opts)) {
+ rollback_lock_file(lock_file);
+ return -1;
+ }
+
+ if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+ die(_("unable to write new index file"));
+
+ return 0;
+}
+
+/**
* Clean the index without touching entries that are not modified between
* `head` and `remote`.
*/
static int clean_index(const unsigned char *head, const unsigned char *remote)
{
- struct lock_file *lock_file;
struct tree *head_tree, *remote_tree, *index_tree;
unsigned char index[GIT_SHA1_RAWSZ];
- struct pathspec pathspec;
head_tree = parse_tree_indirect(head);
if (!head_tree)
@@ -1973,18 +2006,8 @@ static int clean_index(const unsigned char *head, const unsigned char *remote)
if (fast_forward_to(index_tree, remote_tree, 0))
return -1;
- memset(&pathspec, 0, sizeof(pathspec));
-
- lock_file = xcalloc(1, sizeof(struct lock_file));
- hold_locked_index(lock_file, 1);
-
- if (read_tree(remote_tree, 0, &pathspec)) {
- rollback_lock_file(lock_file);
+ if (merge_tree(remote_tree))
return -1;
- }
-
- if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
- die(_("unable to write new index file"));
remove_branch_state();
diff --git a/t/t4151-am-abort.sh b/t/t4151-am-abort.sh
index 05bdc3e..9c3bbd1 100755
--- a/t/t4151-am-abort.sh
+++ b/t/t4151-am-abort.sh
@@ -168,4 +168,16 @@ test_expect_success 'am --abort on unborn branch will keep local commits intact'
test_cmp expect actual
'
+test_expect_success 'am --abort leaves index stat info alone' '
+ git checkout -f --orphan stat-info &&
+ git reset &&
+ test_commit should-be-untouched &&
+ test-chmtime =0 should-be-untouched.t &&
+ git update-index --refresh &&
+ git diff-files --exit-code --quiet &&
+ test_must_fail git am 0001-*.patch &&
+ git am --abort &&
+ git diff-files --exit-code --quiet
+'
+
test_done
--
2.5.0.331.g11c07ce
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