From: Phillip Wood <phillip.wood123@gmail.com>
To: git@vger.kernel.org
Cc: Jeff King <peff@peff.net>, Taylor Blau <me@ttaylorr.com>,
"brian m. carlson" <sandals@crustytoothpaste.net>,
Thomas Guyot-Sionnest <tguyot@gmail.com>,
Junio C Hamano <gitster@pobox.com>,
Phillip Wood <phillip.wood123@gmail.com>
Subject: [PATCH v2 1/4] diff --no-index: refuse to compare stdin to a directory
Date: Wed, 5 Jul 2023 20:49:27 +0100 [thread overview]
Message-ID: <5e65a15223bc42293516308eb31ade5395609c55.1688586536.git.phillip.wood@dunelm.org.uk> (raw)
In-Reply-To: <cover.1688586536.git.phillip.wood@dunelm.org.uk>
From: Phillip Wood <phillip.wood@dunelm.org.uk>
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@dunelm.org.uk>
---
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
next prev parent reply other threads:[~2023-07-05 19:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-27 14:10 [PATCH 0/3] diff --no-index: support reading from named pipes Phillip Wood
2023-06-27 14:10 ` [PATCH 1/3] diff --no-index: die on error reading stdin Phillip Wood
2023-06-27 14:10 ` [PATCH 2/3] t4054: test diff --no-index with stdin Phillip Wood
2023-06-27 14:10 ` [PATCH 3/3] diff --no-index: support reading from named pipes Phillip Wood
2023-06-27 19:44 ` Junio C Hamano
2023-06-28 10:05 ` Phillip Wood
2023-07-05 19:49 ` [PATCH v2 0/4] " Phillip Wood
2023-07-05 19:49 ` Phillip Wood [this message]
2023-07-05 21:17 ` [PATCH v2 1/4] diff --no-index: refuse to compare stdin to a directory Junio C Hamano
2023-07-05 19:49 ` [PATCH v2 2/4] diff --no-index: die on error reading stdin Phillip Wood
2023-07-05 21:18 ` Junio C Hamano
2023-07-05 19:49 ` [PATCH v2 3/4] t4054: test diff --no-index with stdin Phillip Wood
2023-07-05 21:22 ` Junio C Hamano
2023-07-05 19:49 ` [PATCH v2 4/4] diff --no-index: support reading from named pipes Phillip Wood
2023-07-05 22:19 ` Junio C Hamano
2023-08-09 17:17 ` Jeff King
2023-08-10 12:56 ` Phillip Wood
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