From f4614ca0e616648eaae1012cf48123ac6a78937f Mon Sep 17 00:00:00 2001
From: Bastian Dehn <hhaalo@arcor.de>
Date: Sat, 8 Aug 2026 11:01:06 +0200
Subject: [PATCH] add rsync hard link paramter

---
 src/backup              |  7 +++++++
 tests/backup_tests.bats | 23 +++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/src/backup b/src/backup
index 81c2bef..b2533ac 100755
--- a/src/backup
+++ b/src/backup
@@ -134,6 +134,7 @@ path_backup()
 	local machine="$2"
 	local path="$3"
 	local full_backup_path="$4"
+	local last_backup_dir_path="$5"
 	local remote_user=
 	local host=
 
@@ -171,6 +172,9 @@ path_backup()
 		rsyncargs+=("--exclude=$exclude")
 	done
 	rsyncargs+=("--rsh=\"ssh -p $port\"")
+	[ -n "$last_backup_dir_path" ] \
+			&& rsyncargs+=("--link-dest=$last_backup_dir_path/$machine")
+
 	local hostpath="$remote_user@$host:$path"
 	[ "$host" == "localhost" ] && hostpath="$path"
 	rsyncargs+=("$hostpath")
@@ -189,6 +193,7 @@ machine_backup_pathes()
 	local config="$1"
 	local machine="$2"
 	local full_backup_path="$3"
+	local last_backup_dir_path="$4"
 	local pathes=()
 	mapfile -t pathes < <(echo "$config" \
 		| jq --raw-output ".machines.$machine.pathes[]" \
@@ -207,6 +212,7 @@ machine_backup_pathes()
 			"$machine" \
 			"$path" \
 			"$full_backup_path" \
+			"$last_backup_dir_path" \
 			|| return $?
 		print_line
 	done
@@ -232,6 +238,7 @@ backup_machines()
 		machine_backup_pathes "$config" \
 			"$machine" \
 			"$full_backup_path" \
+			"$last_backup_dir_path" \
 			|| return $?
 	done
 }
diff --git a/tests/backup_tests.bats b/tests/backup_tests.bats
index 5bfd121..55a9943 100755
--- a/tests/backup_tests.bats
+++ b/tests/backup_tests.bats
@@ -592,6 +592,29 @@ teardown() {
 	assert_equal "$(awk 'NR==11 {print; exit}' "$RSYNC_LOG")" "build/2000-01-01_01_backup/onlylocal"
 }
 
+@test "success backup machine path rsync localhost with hard links" {
+	mkdir --parents "build/1999-12-31_01_backup"
+
+	RSYNC_LOG_RUNS="4"
+	run main
+
+	assert_success
+	assert_line --index 0 "⭐ START: backup"
+	assert_line --partial "✅ SUCCESS: backup"
+	assert_equal "$(awk 'NR==1 {print; exit}' "$RSYNC_LOG")" "11"
+	assert_equal "$(awk 'NR==2 {print; exit}' "$RSYNC_LOG")" "--archive"
+	assert_equal "$(awk 'NR==3 {print; exit}' "$RSYNC_LOG")" "--verbose"
+	assert_equal "$(awk 'NR==4 {print; exit}' "$RSYNC_LOG")" "--sparse"
+	assert_equal "$(awk 'NR==5 {print; exit}' "$RSYNC_LOG")" "--acls"
+	assert_equal "$(awk 'NR==6 {print; exit}' "$RSYNC_LOG")" "--hard-links"
+	assert_equal "$(awk 'NR==7 {print; exit}' "$RSYNC_LOG")" "--relative"
+	assert_equal "$(awk 'NR==8 {print; exit}' "$RSYNC_LOG")" "--human-readable"
+	assert_equal "$(awk 'NR==9 {print; exit}' "$RSYNC_LOG")" "--rsh=\"ssh -p 22\""
+	assert_equal "$(awk 'NR==10 {print; exit}' "$RSYNC_LOG")" "--link-dest=build/1999-12-31_01_backup/onlylocal"
+	assert_equal "$(awk 'NR==11 {print; exit}' "$RSYNC_LOG")" "/home/local"
+	assert_equal "$(awk 'NR==12 {print; exit}' "$RSYNC_LOG")" "build/2000-01-01_01_backup/onlylocal"
+}
+
 @test "failure backup machine path rsync failed" {
 	rsync() {
 		return 1
-- 
2.47.3