diff mbox series

[pseudo,10/20] test/test-proc-pipe.sh: Add test case for proc pipes

Message ID 1768520616-7289-11-git-send-email-mark.hatle@kernel.crashing.org
State New
Headers show
Series Consolidated pseudo patches | expand

Commit Message

Mark Hatle Jan. 15, 2026, 11:43 p.m. UTC 
From: Mark Hatle <mark.hatle@amd.com>

See: Yocto Project bugzilla 16028, comment #23.

This is related to both statx and realpath behavior.

Gauthier HADERER (see comment 23) reported an issue where realpath like
behavior of pseudo_fix_path function resulted in a failure of the rust
based tail command.

It was determined that the behavior could be emulated by doing:

echo "test" | tail /dev/fd/0

(tail, cat or any other similar command would result in the same failure)

This results in:
  /dev/fd/0 -> /proc/self/fd/0
  /proc/self/fd/0 -> /proc/1475524/fd/0
  /proc/1475524/fd/0 -> /proc/1475524/fd/pipe:[1177004485]

with an eventual failure of unable to open /proc/1475524/fd/pipe:[1177004485]

Reported-by: Gauthier HADERER <ghaderer@wyplay.com>

Signed-off-by: Mark Hatle <mark.hatle@amd.com>
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
---
 test/test-proc-pipe.sh | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100755 test/test-proc-pipe.sh
diff mbox series

Patch

diff --git a/test/test-proc-pipe.sh b/test/test-proc-pipe.sh
new file mode 100755
index 0000000..30b6880
--- /dev/null
+++ b/test/test-proc-pipe.sh
@@ -0,0 +1,27 @@ 
+#!/bin/bash
+#
+# SPDX-License-Identifier: LGPL-2.1-only
+#
+# See Yocto Project bugzilla 16028
+#
+# It was determined that a utility that use /dev/fd may fail when run under
+# pseudo, while working properly outside.
+#
+# For example: echo "test" | cat /dev/fd/0
+
+# Tests
+result=$(echo "test" | cat 2>&1)
+rc=$?
+if [ $rc -ne 0 -o "$result" != "test" ]; then
+    echo Failed simple echo pipe test - $rc:
+    echo $result
+    exit 1
+fi
+
+result=$(echo "test" | cat /dev/fd/0 2>&1)
+rc=$?
+if [ $rc -ne 0 -o "$result" != "test" ]; then
+    echo Failed /dev/fd/0 echo pipe test - $rc:
+    echo $result
+    exit 1
+fi