[PATCH 1/2] t3404: demonstrate CHERRY_PICK_HEAD bug

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When rev-list's --cherry option does not detect that a patch has already
been applied upstream, an interactive rebase would offer to reapply it and
consequently stop at that patch with a failure, mentioning that the diff
is empty.

Traditionally, a `git rebase --continue` simply skips the commit in such a
situation.

However, as pointed out by Gábor Szeder, this leaves a CHERRY_PICK_HEAD
behind, making the Git prompt believe that a cherry pick is still going
on. This commit adds a test case demonstrating this bug.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
 t/t3404-rebase-interactive.sh | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index ac429a0..5d52775 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -1102,4 +1102,24 @@ test_expect_success 'rebase -i commits that overwrite untracked files (no ff)' '
 	test $(git cat-file commit HEAD | sed -ne \$p) = I
 '
 
+test_expect_failure 'rebase --continue removes CHERRY_PICK_HEAD' '
+	git checkout -b commit-to-skip &&
+	for double in X 3 1
+	do
+		seq 5 | sed "s/$double/&&/" >seq &&
+		git add seq &&
+		test_tick &&
+		git commit -m seq-$double
+	done &&
+	git tag seq-onto &&
+	git reset --hard HEAD~2 &&
+	git cherry-pick seq-onto &&
+	test_must_fail git rebase -i seq-onto &&
+	test -d .git/rebase-merge &&
+	git rebase --continue &&
+	git diff seq-onto &&
+	test ! -d .git/rebase-merge &&
+	test ! -f .git/CHERRY_PICK_HEAD
+'
+
 test_done
-- 
2.3.1.windows.1.9.g8c01ab4



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