From c4e6b3f7b7d0e6a9f88703fbf7e447f7e51c2323 Mon Sep 17 00:00:00 2001
From: GeiserX <9169332+GeiserX@users.noreply.github.com>
Date: Sat, 3 Oct 2026 19:06:49 +0200
Subject: [PATCH 1/2] chore(git): keep Co-Authored-By trailers out of commits
 made with the beads hooks

---
 .beads/hooks/commit-msg | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100755 .beads/hooks/commit-msg

diff --git a/.beads/hooks/commit-msg b/.beads/hooks/commit-msg
new file mode 100755
index 0000000..cab92aa
--- /dev/null
+++ b/.beads/hooks/commit-msg
@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+# Every commit in this repository has one author. Clones that point
+# core.hooksPath at .beads/hooks skip the machine-wide git hooks, so this
+# hook does the one job those had here: it removes Co-Authored-By trailer
+# lines from the commit message. A mention inside a sentence is kept.
+# If anything fails, the message is left as it was and the commit stops.
+msg="$1"
+[ -f "$msg" ] || exit 0
+tmp="$msg.strip.$$"
+grep -v -i '^[[:space:]]*co-authored-by:' "$msg" > "$tmp"
+[ $? -le 1 ] || { rm -f "$tmp"; exit 1; }
+awk '{ line[NR] = $0 }
+     END { n = NR
+           while (n > 0 && line[n] ~ /^[[:space:]]*$/) n--
+           for (i = 1; i <= n; i++) print line[i] }' "$tmp" > "$tmp.out" &&
+  mv "$tmp.out" "$msg" || { rm -f "$tmp" "$tmp.out"; exit 1; }
+rm -f "$tmp"
+exit 0

From 27558ad869a5601715f136c365e9c48ab86b61c7 Mon Sep 17 00:00:00 2001
From: GeiserX <9169332+GeiserX@users.noreply.github.com>
Date: Sat, 3 Oct 2026 21:13:13 +0200
Subject: [PATCH 2/2] fix(git): touch only messages that carry the trailer, and
 replace them atomically

---
 .beads/hooks/commit-msg | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/.beads/hooks/commit-msg b/.beads/hooks/commit-msg
index cab92aa..2a27374 100755
--- a/.beads/hooks/commit-msg
+++ b/.beads/hooks/commit-msg
@@ -3,16 +3,30 @@
 # core.hooksPath at .beads/hooks skip the machine-wide git hooks, so this
 # hook does the one job those had here: it removes Co-Authored-By trailer
 # lines from the commit message. A mention inside a sentence is kept.
-# If anything fails, the message is left as it was and the commit stops.
+#
+# A message without such a line is never touched. Otherwise the cleaned
+# text goes to a fresh file from mktemp, is compared with a second run,
+# and is renamed over the message only when every step worked; on any
+# failure the message stays as it was and the commit stops.
 msg="$1"
 [ -f "$msg" ] || exit 0
-tmp="$msg.strip.$$"
-grep -v -i '^[[:space:]]*co-authored-by:' "$msg" > "$tmp"
-[ $? -le 1 ] || { rm -f "$tmp"; exit 1; }
-awk '{ line[NR] = $0 }
-     END { n = NR
-           while (n > 0 && line[n] ~ /^[[:space:]]*$/) n--
-           for (i = 1; i <= n; i++) print line[i] }' "$tmp" > "$tmp.out" &&
-  mv "$tmp.out" "$msg" || { rm -f "$tmp" "$tmp.out"; exit 1; }
-rm -f "$tmp"
+case $msg in -*) msg="./$msg" ;; esac
+found=0
+LC_ALL=C grep -q -i '^[[:space:]]*co-authored-by:' "$msg" || found=$?
+case $found in
+  0) ;;
+  1) exit 0 ;;
+  *) echo "commit-msg: cannot read $msg" >&2; exit 1 ;;
+esac
+clean() {
+  LC_ALL=C awk 'tolower($0) !~ /^[ \t\r\f\v]*co-authored-by:/ { line[++n] = $0 }
+       END { while (n > 0 && line[n] ~ /^[ \t\r\f\v]*$/) n--
+             for (i = 1; i <= n; i++) print line[i] }' < "$msg"
+}
+tmp=$(mktemp "$msg.XXXXXX") || { echo "commit-msg: cannot create a temporary file beside $msg" >&2; exit 1; }
+trap 'rm -f "$tmp"' EXIT
+trap 'exit 1' HUP INT TERM
+clean > "$tmp" && clean | cmp -s - "$tmp" || { echo "commit-msg: cannot rewrite $msg" >&2; exit 1; }
+trap '' HUP INT TERM
+mv -f "$tmp" "$msg" || { echo "commit-msg: cannot replace $msg" >&2; exit 1; }
 exit 0