[PATCH] [pre-commit] Add file mode check

[Tom de Vries <tdevries@suse.de>]

Claude Code mentioned in a review that a source file was marked executable.

I've submitted a patch to fix this [1].

Detect this problem using pre-commit to prevent it from re-occurring.

The current unfixed state gives us (abbreviated output using "..."):
...
$ pre-commit run check-file-mode --all-files
check-file-mode.........................................................Failed
- hook id: check-file-mode
- exit code: 1

100755 ... gdb/testsuite/gdb.base/jump_multiple_objfiles.h
100755 ... gdb/testsuite/gdb.fortran/nested-funcs.f90
100755 ... gdb/testsuite/gdb.fortran/oop_extend_type.f90
100755 ... gdb/amd64-tdep.c
100755 ... gdb/testsuite/lib/compiler.cc
100755 ... gdb/testsuite/gdb.fortran/nested-funcs.exp
100755 ... gdb/testsuite/gdb.fortran/vla-type.f90
100755 ... gdb/testsuite/gdb.arch/amd64-lam.c
100755 ... gdb/testsuite/gdb.base/jump_multiple_objfiles.exp
100755 ... gdb/testsuite/gdb.testsuite/gdb_test_multiple-lbl.gdb
100755 ... gdb/testsuite/gdb.btrace/exception.exp
100755 ... gdb/testsuite/gdb.fortran/vla-type.exp
100755 ... gdb/testsuite/gdb.base/jump_multiple_objfiles.c
100755 ... gdb/testsuite/gdb.base/jump_multiple_objfiles-foo.c
100755 ... gdb/testsuite/gdb.fortran/oop_extend_type.exp
100755 ... gdb/testsuite/gdb.fortran/print_type.exp
...

Shell-checked new script gdb/contrib/check-file-mode.sh.

[1] https://sourceware.org/pipermail/gdb-patches/2026-June/227780.html
---
 .pre-commit-config.yaml        |  5 ++++
 gdb/contrib/check-file-mode.sh | 42 ++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100755 gdb/contrib/check-file-mode.sh

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index fe8466433ac..d75468d0b48 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -112,6 +112,11 @@ repos:
       additional_dependencies: ["pyyaml"]
       always_run: true
       require_serial: true
+    - id: check-file-mode
+      name: check-file-mode
+      language: script
+      entry: gdb/contrib/check-file-mode.sh
+      files: '^(gdb|gdbserver|gdbsupport)/.*$'
   - repo: https://github.com/nmoroze/tclint
     rev: v0.8.0
     hooks:
diff --git a/gdb/contrib/check-file-mode.sh b/gdb/contrib/check-file-mode.sh
new file mode 100755
index 00000000000..a558731c425
--- /dev/null
+++ b/gdb/contrib/check-file-mode.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# Copyright (C) 2026 Free Software Foundation, Inc.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+
+no_exec_files=()
+for f in "$@"; do
+    case $f in
+	*/*.py|*/*.sh|*/configure)
+	    continue
+	    ;;
+	gdb/gstack-1.in|gdb/gcore-1.in|gdb/po/gdbtext|gdb/make-init-c|gdb/testsuite/lib/notty-wrap|gdb/testsuite/lib/pdtrace.in)
+	    continue
+	    ;;
+	*)
+	    no_exec_files=("${no_exec_files[@]}" "$f")
+	    ;;
+    esac
+done
+
+if [ ${#no_exec_files[@]} -eq 0 ]; then
+    exit 0
+fi
+
+# Flag files that are executable, but not meant to be executable.
+
+if git ls-files --stage -- "${no_exec_files[@]}" | grep '^100755 '; then
+    exit 1
+fi

base-commit: 663cb9c0428068165fc98675599442163d302d41
-- 
2.51.0