fix test and add example

Author: egegunes

deploy/cr.yaml

@@ -469,6 +469,7 @@ spec:
 #    dynamicConfiguration:
 #      postgresql:
 #        parameters:
+#          restore_command: "pgbackrest --stanza=db archive-get %f \"%p\""
 #          max_parallel_workers: 2
 #          max_worker_processes: 2
 #          shared_buffers: 1GB

internal/pgbackrest/postgres_test.go

@@ -55,14 +55,14 @@ func TestPostgreSQLParameters(t *testing.T) {
 	assert.DeepEqual(t, parameters.Mandatory.AsMap(), map[string]string{
 		"archive_mode": "on",
 		"archive_command": strings.Join([]string{
-			`pgbackrest --stanza=db archive-push "%p"`,
-			` && timestamp=$(pg_waldump "%p" | grep COMMIT | awk '{print $(NF`,
-			`-2) "T" $(NF-1) " " $(NF)}' | sed -E 's/([0-9]{4}-[0-9]{2}-[0-9]`,
-			`{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\+\-][0-9]{2})/\`,
-			`1\2/' | sed 's/UTC/Z/' | tail -n 1 | grep -E '^[0-9]{4}-[0-9]{2}`,
-			`-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})`,
-			"$'); if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/l",
-			"atest_commit_timestamp.txt; fi",
+			`pgbackrest --stanza=db archive-push "%p" `,
+			`&& timestamp=$(pg_waldump "%p" | `,
+			`grep -oP "COMMIT \K[^;]+" | `,
+			`sed -E "s/([0-9]{4}-[0-9]{2}-[0-9]{2}) ([0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}) (UTC|[\\+\\-][0-9]{2})/\1T\2\3/" | `,
+			`sed "s/UTC/Z/" | `,
+			"tail -n 1 | ",
+			`grep -E "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]{6}(Z|[\+\-][0-9]{2})$"); `,
+			"if [ ! -z ${timestamp} ]; then echo ${timestamp} > /pgdata/latest_commit_timestamp.txt; fi",
 		}, ""),
 		"restore_command":        "/bin/true",
 		"track_commit_timestamp": "true",