From 537ad16e3a869aa2d70b4d24d83bd1d8c73b3b21 Mon Sep 17 00:00:00 2001
From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Thu, 10 Jul 2025 19:45:08 +1000
Subject: [PATCH] extract the check_dups function from common.sh

---
 check_dups.sh | 42 ++++++++++++++++++++++++++++++++++++++++++
 common.sh     | 37 -------------------------------------
 do_merge      |  1 +
 fetch_trees   |  1 +
 4 files changed, 44 insertions(+), 37 deletions(-)
 create mode 100644 check_dups.sh

diff --git a/check_dups.sh b/check_dups.sh
new file mode 100644
index 0000000..85e716e
--- /dev/null
+++ b/check_dups.sh
@@ -0,0 +1,42 @@
+#
+# shared check_dups funciont
+#
+
+check_dups()
+{
+	# "In POSIX sh, 'local' is undefined."
+	# shellcheck disable=SC3043
+	local name base sha dfile
+
+	name="$1"
+	base="$2"
+	sha="$3"
+	dlfile="$top_dir/duplicates/linus/$name"
+	if [ "$base" = "HEAD" ]; then
+		dfile="$top_dir/duplicates/next/$name"
+	else
+		dfile="$dlfile"
+	fi
+
+	# if there is anything in this tree, then check for duplicates
+	if [ "$(git rev-list --count --no-merges "$base".."$sha")" -eq 0 ]; then
+		rm -f "$dfile"
+		return;
+	fi
+
+	dups=$(git cherry "$base" "$sha" | sed -n 's/^- //p' |
+		xargs -r -n 1 "$tools_dir"/clog | sort)
+	if [ "$base" = "HEAD" ] && [ -f "$dlfile" ]; then
+		dups=$(printf '%s\n' "$dups" | comm -23 - "$dlfile")
+	fi
+	if [ -z "$dups" ]; then
+		rm -f "$dfile"
+	elif ! [ -f "$dfile" ]; then
+		printf '%s\n' "$dups" | tee "$dfile"
+	elif ! printf '%s\n' "$dups" | cmp -s - "$dfile"; then
+		printf '%s\n' "$dups" | comm -23 - "$dfile"
+		printf '%s\n' "$dups" >"$dfile"
+	fi
+}
+
+true
diff --git a/common.sh b/common.sh
index 0bb8d69..272d269 100644
--- a/common.sh
+++ b/common.sh
@@ -134,41 +134,4 @@ check_unmerged_files()
 	fi
 }
 
-check_dups()
-{
-	# "In POSIX sh, 'local' is undefined."
-	# shellcheck disable=SC3043
-	local name base sha dfile
-
-	name="$1"
-	base="$2"
-	sha="$3"
-	dlfile="$top_dir/duplicates/linus/$name"
-	if [ "$base" = "HEAD" ]; then
-		dfile="$top_dir/duplicates/next/$name"
-	else
-		dfile="$dlfile"
-	fi
-
-	# if there is anything in this tree, then check for duplicates
-	if [ "$(git rev-list --count --no-merges "$base".."$sha")" -eq 0 ]; then
-		rm -f "$dfile"
-		return;
-	fi
-
-	dups=$(git cherry "$base" "$sha" | sed -n 's/^- //p' |
-		xargs -r -n 1 "$tools_dir"/clog | sort)
-	if [ "$base" = "HEAD" ] && [ -f "$dlfile" ]; then
-		dups=$(printf '%s\n' "$dups" | comm -23 - "$dlfile")
-	fi
-	if [ -z "$dups" ]; then
-		rm -f "$dfile"
-	elif ! [ -f "$dfile" ]; then
-		printf '%s\n' "$dups" | tee "$dfile"
-	elif ! printf '%s\n' "$dups" | cmp -s - "$dfile"; then
-		printf '%s\n' "$dups" | comm -23 - "$dfile"
-		printf '%s\n' "$dups" >"$dfile"
-	fi
-}
-
 true
diff --git a/do_merge b/do_merge
index 47a1408..34bb2f7 100755
--- a/do_merge
+++ b/do_merge
@@ -24,6 +24,7 @@ shift $((OPTIND - 1))
 
 tools_dir=$(dirname "$0")
 . "$tools_dir/common.sh"
+. "$tools_dir/check_dups.sh"
 
 log()
 {
diff --git a/fetch_trees b/fetch_trees
index 92accdd..48599f8 100755
--- a/fetch_trees
+++ b/fetch_trees
@@ -2,6 +2,7 @@
 
 tools_dir=$(dirname "$0")
 . "$tools_dir/common.sh" ''
+. "$tools_dir/check_dups.sh"
 
 if [ "$1" = '-n' ]; then
 	shift
-- 
2.39.5