Subject: [PATCH v3 2/2] stash push -u: don't create empty stash

From: Thomas Gummerer <[email-masked]>
Date: Fri, 16 Mar 2018 20:43:06 +0000

When introducing the stash push feature, and thus allowing users to pass
in a pathspec to limit the files that would get stashed in
df6bba0937 ("stash: teach 'push' (and 'create_stash') to honor
pathspec", 2017-02-28), this developer missed one place where the
pathspec should be passed in.

Namely in the call to the 'untracked_files()' function in the
'no_changes()' function.  This resulted in 'git stash push -u --
<non-existant>' creating an empty stash when there are untracked files
in the repository other that don't match the pathspec.

As 'git stash' never creates empty stashes, this behaviour is wrong and
confusing for users.  Instead it should just show a message "No local
changes to save", and not create a stash.

Luckily the 'untracked_files()' function already correctly respects
pathspecs that are passed to it, so the fix is simply to pass the
pathspec along to the function.

Reported-by: Marc Strapetz <[email-masked]>
Signed-off-by: Thomas Gummerer <[email-masked]>
---
 git-stash.sh     | 2 +-
 t/t3903-stash.sh | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/git-stash.sh b/git-stash.sh
index 4de9f9bea8..dbedc7fb9f 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -39,7 +39,7 @@ fi
 no_changes () {
 	git diff-index --quiet --cached HEAD --ignore-submodules -- "$@" &&
 	git diff-files --quiet --ignore-submodules -- "$@" &&
-	(test -z "$untracked" || test -z "$(untracked_files)")
+	(test -z "$untracked" || test -z "$(untracked_files "$@")")
 }
 
 untracked_files () {
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 8b1a8d2982..7efc52fe11 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -1112,4 +1112,10 @@ test_expect_success 'stash -u -- <untracked> leaves rest of working tree in plac
 	test_path_is_file tracked
 '
 
+test_expect_success 'stash -u -- <non-existant> shows no changes when there are none' '
+	git stash push -u -- non-existant >actual &&
+	echo "No local changes to save" >expect &&
+	test_i18ncmp expect actual
+'
+
 test_done
-- 
2.16.2.804.g6dcf76e11