[PATCH] stash: It looks like a stash, but doesn't quack like a stash...

[Jon Seymour <jon.seymour@gmail.com>]

In particular, a stash created with git stash create cannot be used as
an argument to git stash branch because of two separate reasons.

1. a pre-condition assumes that there is always a stash on the stack when git stash branch is called,
which is not necessarily true

2. the cleanup code assumes the specified stash is a stash reference, rather than an arbitrary commit.

The tests test_expect_failure tests in this patch demonstrate these issues.
---
 t/t3903-stash.sh |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 62e208a..7fea2a2 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -378,4 +378,32 @@ test_expect_failure 'stash file to directory' '
 	test foo = "$(cat file/file)"
 '
 
+test_expect_failure 'stash branch from arbitrary stash ref when there are no stash references' '
+	git stash clear &&
+	test_when_finished "git reset --hard HEAD" &&
+	git reset --hard &&
+	echo foo >> file &&
+	git tag stash-tag $(git stash create) &&
+	test_when_finished "git tag -d stash-tag" &&
+	git reset --hard &&
+	test_when_finished "git reset --hard HEAD && git checkout master" &&
+	git stash branch stash-branch $(git rev-parse stash-tag) &&
+	test $(git ls-files --modified) -eq 1
+'
+
+test_expect_failure 'stash branch from arbitrary stash ref fails even if there is a stash' '
+	git stash clear &&
+	test_when_finished "git reset --hard HEAD" &&
+	git reset --hard &&
+	echo foo >> file &&
+	git stash &&
+	echo bar >> file &&
+	git tag stash-tag $(git stash create) &&
+	test_when_finished "git tag -d stash-tag" &&
+	git reset --hard &&
+	git stash branch stash-branch $(git rev-parse stash-tag) &&
+	test_when_finished "git reset --hard HEAD && git checkout master && git branch -D stash-branch" &&
+	test $(git ls-files --modified) -eq 1
+'
+
 test_done
-- 
1.7.2