When -R is given, queue_diff() swaps the mode and name variables of the
two files to produce a reverse diff. 1e3f26542a (diff --no-index:
support reading from named pipes, 2023-07-05) added variables that
indicate whether files are special, i.e named pipes or - for stdin.
These new variables were not swapped, though, which broke the handling
of stdin with with -R. Swap them like the other metadata variables.
Reported-by: Martin Storsjö <martin@xxxxxxxxx>
Signed-off-by: René Scharfe <l.s.r@xxxxxx>
---
Great bug report, thank you!
diff-no-index.c | 1 +
t/t4053-diff-no-index.sh | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/diff-no-index.c b/diff-no-index.c
index 8aead3e332..e7041b89e3 100644
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -232,6 +232,7 @@ static int queue_diff(struct diff_options *o,
if (o->flags.reverse_diff) {
SWAP(mode1, mode2);
SWAP(name1, name2);
+ SWAP(special1, special2);
}
d1 = noindex_filespec(name1, mode1, special1);
diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh
index 6781cc9078..5f059f65fc 100755
--- a/t/t4053-diff-no-index.sh
+++ b/t/t4053-diff-no-index.sh
@@ -224,6 +224,25 @@ test_expect_success "diff --no-index treats '-' as stdin" '
test_must_be_empty actual
'
+test_expect_success "diff --no-index -R treats '-' as stdin" '
+ cat >expect <<-EOF &&
+ diff --git b/a/1 a/-
+ index $(git hash-object --stdin <a/1)..$ZERO_OID 100644
+ --- b/a/1
+ +++ a/-
+ @@ -1 +1 @@
+ -1
+ +x
+ EOF
+
+ test_write_lines x | test_expect_code 1 \
+ git -c core.abbrev=no diff --no-index -R -- - a/1 >actual &&
+ test_cmp expect actual &&
+
+ test_write_lines 1 | git diff --no-index -R -- a/1 - >actual &&
+ test_must_be_empty 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
--
2.42.0
