diff --git a/src/pipeline.sh b/src/pipeline.sh
index f62d65e..005964f 100755
--- a/src/pipeline.sh
+++ b/src/pipeline.sh
@@ -130,7 +130,39 @@ main() (
 		usage
 		fail "Missing positionnal argument PIPELINE."
 	fi
+
+	# Check pipeline validity.
 	pipeline="$1"
+	case "${pipeline}" in
+	newcommit)
+		if [ -z "${repo_name}" ]; then
+			usage
+			fail "missing option -n|--name for pipeline '${pipeline}'."
+		fi
+		if [ -z "${repo_hash}" ]; then
+			usage
+			fail "missing option -h|--hash for pipeline '${pipeline}'."
+		fi
+		;;
+	newtag)
+		if [ -z "${repo_name}" ]; then
+			usage
+			fail "Missing option -n|--name for pipeline '${pipeline}'."
+		fi
+		if [ -z "${repo_hash}" ]; then
+			usage
+			fail "Missing option -H|--hash for pipeline '${pipeline}'."
+		fi
+		if [ -z "${repo_tag}" ]; then
+			usage
+			fail "Missing option -T|--tag for pipeline '${pipeline}'."
+		fi
+		;;
+	*)
+		usage
+		fail "Unexpected value for PIPELINE: '${pipeline}'."
+		;;
+	esac
 
 	# Load config file.
 	if [ ! -r "${config_file}" ]; then
@@ -189,17 +221,9 @@ main() (
 	rd_pipeline_sock_dir="${pipeline_sock_dir}/${pipeline}-${tsp}-${random}"
 	rd_pipeline_sock="${rd_pipeline_sock_dir}/pipeline.sock"
 
-	# Check pipeline with options.
+	# Build runner request.
 	case "${pipeline}" in
 	newcommit)
-		if [ -z "${repo_name}" ]; then
-			usage
-			fail "Missing option -n|--name for pipeline '${pipeline}'."
-		fi
-		if [ -z "${repo_hash}" ]; then
-			usage
-			fail "Missing option -H|--hash for pipeline '${pipeline}'."
-		fi
 		runner_request="$(jq --null-input --compact-output \
 			--arg s "${rd_pipeline_sock}" \
 			--arg n "${repo_name}" \
@@ -207,18 +231,6 @@ main() (
 			'{"response_sock":$s,"repo_name":$n,"repo_hash":$h}')"
 		;;
 	newtag)
-		if [ -z "${repo_name}" ]; then
-			usage
-			fail "Missing option -n|--name for pipeline '${pipeline}'."
-		fi
-		if [ -z "${repo_hash}" ]; then
-			usage
-			fail "Missing option -H|--hash for pipeline '${pipeline}'."
-		fi
-		if [ -z "${repo_tag}" ]; then
-			usage
-			fail "Missing option -T|--tag for pipeline '${pipeline}'."
-		fi
 		runner_request="$(jq --null-input --compact-output \
 			--arg s "${rd_pipeline_sock}" \
 			--arg n "${repo_name}" \