stash push: avoid printing errors

'git stash push -u -- <pathspec>' prints the following errors if
<pathspec> only matches untracked files:

    fatal: pathspec 'untracked' did not match any files
    error: unrecognized input

This is because we first clean up the untracked files using 'git clean
<pathspec>', and then use a command chain involving 'git add -u
<pathspec>' and 'git apply' to clear the changes to files that are in
the index and were stashed.

As the <pathspec> only includes untracked files that were already
removed by 'git clean', the 'git add' call will barf, and so will 'git
apply', as there are no changes that need to be applied.

Fix this by avoiding the 'git clean' if a pathspec is given, and use the
pipeline that's used for pathspec mode to get rid of the untracked files
as well.

Reported-by: Marc Strapetz <[email protected]>
Signed-off-by: Thomas Gummerer <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: tgummerer

git-stash.sh

@@ -308,14 +308,16 @@ push_stash () {
 	if test -z "$patch_mode"
 	then
 		test "$untracked" = "all" && CLEAN_X_OPTION=-x || CLEAN_X_OPTION=
-		if test -n "$untracked"
+		if test -n "$untracked" && test $# = 0
 		then
 			git clean --force --quiet -d $CLEAN_X_OPTION -- "$@"
 		fi
 
 		if test $# != 0
 		then
-			git add -u -- "$@"
+			test -z "$untracked" && UPDATE_OPTION="-u" || UPDATE_OPTION=
+			test "$untracked" = "all" && FORCE_OPTION="--force" || FORCE_OPTION=
+			git add $UPDATE_OPTION $FORCE_OPTION -- "$@"
 			git diff-index -p --cached --binary HEAD -- "$@" |
 			git apply --index -R
 		else

t/t3905-stash-include-untracked.sh

@@ -228,4 +228,50 @@ test_expect_success 'stash previously ignored file' '
 	test_path_is_file ignored.d/foo
 '
 
+test_expect_success 'stash -u -- <untracked> doesnt print error' '
+	>untracked &&
+	git stash push -u -- untracked 2>actual &&
+	test_path_is_missing untracked &&
+	test_line_count = 0 actual
+'
+
+test_expect_success 'stash -u -- <untracked> leaves rest of working tree in place' '
+	>tracked &&
+	git add tracked &&
+	>untracked &&
+	git stash push -u -- untracked &&
+	test_path_is_missing untracked &&
+	test_path_is_file tracked
+'
+
+test_expect_success 'stash -u -- <tracked> <untracked> clears changes in both' '
+	>tracked &&
+	git add tracked &&
+	>untracked &&
+	git stash push -u -- tracked untracked &&
+	test_path_is_missing tracked &&
+	test_path_is_missing untracked
+'
+
+test_expect_success 'stash --all -- <ignored> stashes ignored file' '
+	>ignored.d/bar &&
+	git stash push --all -- ignored.d/bar &&
+	test_path_is_missing ignored.d/bar
+'
+
+test_expect_success 'stash --all -- <tracked> <ignored> clears changes in both' '
+	>tracked &&
+	git add tracked &&
+	>ignored.d/bar &&
+	git stash push --all -- tracked ignored.d/bar &&
+	test_path_is_missing tracked &&
+	test_path_is_missing ignored.d/bar
+'
+
+test_expect_success 'stash -u -- <ignored> leaves ignored file alone' '
+	>ignored.d/bar &&
+	git stash push -u -- ignored.d/bar &&
+	test_path_is_file ignored.d/bar
+'
+
 test_done