From: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
When the user runs
git diff --no-index file directory
we follow the behavior of POSIX diff and rewrite the arguments as
git diff --no-index file directory/file
Doing that when "file" is "-" (which means "read from stdin") does not
make sense so we should error out if the user asks us to compare "-" to
a directory. This matches the behavior of GNU diff and diff on *BSD.
Signed-off-by: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
---
diff-no-index.c | 12 +++++++-----
t/t4053-diff-no-index.sh | 5 +++++
2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/diff-no-index.c b/diff-no-index.c
index 4296940f90..77462ac2a9 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -218,11 +218,13 @@ static void fixup_paths(const char **path, struct strbuf *replacement)
{
unsigned int isdir0, isdir1;
- if (path[0] == file_from_standard_input ||
- path[1] == file_from_standard_input)
- return;
- isdir0 = is_directory(path[0]);
- isdir1 = is_directory(path[1]);
+ isdir0 = path[0] != file_from_standard_input && is_directory(path[0]);
+ isdir1 = path[1] != file_from_standard_input && is_directory(path[1]);
+
+ if ((path[0] == file_from_standard_input && isdir1) ||
+ (isdir0 && path[1] == file_from_standard_input))
+ die(_("cannot compare stdin to a directory"));
+
if (isdir0 == isdir1)
return;
if (isdir0) {
diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh
index 4e9fa0403d..5bfb282e98 100755
--- a/t/t4053-diff-no-index.sh
+++ b/t/t4053-diff-no-index.sh
@@ -205,4 +205,9 @@ test_expect_success POSIXPERM,SYMLINKS 'diff --no-index normalizes: mode not lik
test_cmp expected actual
'
+test_expect_success 'diff --no-index refuses to diff stdin and a directory' '
+ test_must_fail git diff --no-index -- - a </dev/null 2>err &&
+ grep "fatal: cannot compare stdin to a directory" err
+'
+
test_done
--
2.40.1.852.g0a1e0755a6
