diff --git a/spcd.sh b/spcd.sh
index 59ac806..b8d7ed1 100644
--- a/spcd.sh
+++ b/spcd.sh
@@ -1,6 +1,8 @@
 #! /usr/bin/env sh
 
 # defaults
+[ -n "${SPCD_BRANCH_RELEASE}" ] || SPCD_BRANCH_RELEASE="main"
+[ -n "${SPCD_BRANCH_STAGING}" ] || SPCD_BRANCH_STAGING="dev"
 [ -n "${SPCD_DNS}" ] || SPCD_DNS="\
 9.9.9.9 \
 "
@@ -10,9 +12,10 @@
 # main
 spcd_main() {
 	spcd_list_environment_variables
+	spcd_set_environment_variables
+	#
 	spcd_list_working_directory
 	#
-	spcd_set_environment_variables
 	spcd_set_packages_repositories
 	spcd_set_packages_configuration
 	#
@@ -38,7 +41,7 @@ spcd_main() {
 	spcd_switch_to_python "${@}"
 }
 
-# context
+# steps
 
 spcd_list_environment_variables() {
 	spcd_step "List environment variables"
@@ -49,16 +52,93 @@ spcd_list_environment_variables() {
 	done
 }
 
-spcd_list_working_directory() {
-	spcd_step "List working directory"
-	spcd_lwd__path="$(realpath .)"
-	spcd_ls "${spcd_lwd__path}"
-}
-
-# steps
-
 spcd_set_environment_variables() {
 	spcd_step "Set environment variables"
+	# continuous integration / github → gitea → forgejo
+	if [ -n "${GITHUB_ACTIONS}" ]; then
+		# project branch
+		if [ -n "${GITHUB_REF_NAME}" ]; then
+			SPCD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
+		else
+			spcd_error_ci "GITHUB_REF_NAME"
+		fi
+		# project root
+		if [ -n "${GITHUB_SERVER_URL}" ]; then
+			SPCD_PROJECT_ROOT="$(dirname "${GITHUB_SERVER_URL}")//"
+			[ -n "${GITHUB_TOKEN}" ] &&
+				SPCD_PROJECT_ROOT="${SPCD_PROJECT_ROOT}${GITHUB_TOKEN}@"
+			SPCD_PROJECT_ROOT="${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
+		else
+			spcd_error_ci "GITHUB_SERVER_URL"
+		fi
+		# project path & name
+		if [ -n "${GITHUB_REPOSITORY}" ]; then
+			# project path
+			SPCD_PROJECT_PATH="$(dirname "${GITHUB_REPOSITORY}")"
+			# project name
+			SPCD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
+		else
+			spcd_error_ci "GITHUB_REPOSITORY"
+		fi
+	# continuous integration / gitlab
+	elif [ -n "${GITLAB_CI}" ]; then
+		# project branch
+		if [ -n "${CI_COMMIT_BRANCH}" ]; then
+			SPCD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
+		else
+			spcd_error_ci "CI_COMMIT_BRANCH"
+		fi
+		# project root / protocol
+		if [ -n "${CI_SERVER_PROTOCOL}" ]; then
+			# project root / login
+			if [ -n "${CI_REGISTRY_USER}" ]; then
+				# project root / password
+				if [ -n "${CI_REGISTRY_PASSWORD}" ]; then
+					# project root / host
+					if [ -n "${CI_SERVER_FQDN}" ]; then
+						# project root
+						SPCD_PROJECT_ROOT="${CI_SERVER_PROTOCOL}\
+://${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}@${CI_SERVER_FQDN}"
+						# project path
+						if [ -n "${CI_PROJECT_NAMESPACE}" ]; then
+							SPCD_PROJECT_PATH="${CI_PROJECT_NAMESPACE}"
+							# project name
+							if [ -n "${CI_PROJECT_NAME}" ]; then
+								SPCD_PROJECT_NAME="${CI_PROJECT_NAME}"
+							else
+								spcd_error_ci "CI_PROJECT_NAME"
+							fi
+						else
+							spcd_error_ci "CI_PROJECT_NAMESPACE"
+						fi
+					else
+						spcd_error_ci "CI_SERVER_FQDN"
+					fi
+				else
+					spcd_error_ci "CI_REGISTRY_PASSWORD"
+				fi
+			else
+				spcd_error_ci "CI_REGISTRY_USER"
+			fi
+		else
+			spcd_error_ci "CI_SERVER_PROTOCOL"
+		fi
+	# continuous integration / unsupported
+	else
+		spcd_error_ci "ø"
+	fi
+	# check project variables
+	case "${SPCD_PROJECT_BRANCH}" in
+	"${SPCD_BRANCH_RELEASE}" | "${SPCD_BRANCH_STAGING}") ;;
+	*) spcd_error_ci "SPCD_PROJECT_BRANCH" ;;
+	esac
+	[ -n "${SPCD_PROJECT_ROOT}" ] || spcd_error_ci "SPCD_PROJECT_ROOT"
+	[ -n "${SPCD_PROJECT_PATH}" ] || spcd_error_ci "SPCD_PROJECT_PATH"
+	[ -n "${SPCD_PROJECT_NAME}" ] || spcd_error_ci "SPCD_PROJECT_NAME"
+	#
+	spcd_split
+	spcd_echo "SPCD_PROJECT_BRANCH" \
+		"SPCD_PROJECT_ROOT" "SPCD_PROJECT_PATH" "SPCD_PROJECT_NAME"
 	# set path
 	SPCD_PATH="$(realpath "${0}")"
 	spcd_echo "SPCD_PATH"
@@ -367,77 +447,9 @@ Acquire::https::Verify-Peer False;
 	spcd_echo "SPCD_PYTHON_COMMAND" "SPCD_PYTHON_PACKAGE" "SPCD_PYTHON_PACKAGES"
 	# variables
 	[ -n "${SPCD_CA_1}" ] && SPCD_CA=true
-	# continuous integration platform
-	if [ -n "${GITHUB_ACTIONS}" ]; then
-		# github → gitea → forgejo
-		if [ -n "${GITHUB_SERVER_URL}" ]; then
-			SPCD_PROJECT_ROOT="$(dirname "${GITHUB_SERVER_URL}")//"
-			[ -n "${GITHUB_TOKEN}" ] &&
-				SPCD_PROJECT_ROOT="${SPCD_PROJECT_ROOT}${GITHUB_TOKEN}@"
-			SPCD_PROJECT_ROOT="${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
-		else
-			spcd_error_ci "GITHUB_SERVER_URL"
-		fi
-		if [ -n "${GITHUB_REPOSITORY}" ]; then
-			SPCD_PROJECT_PATH="$(dirname "${GITHUB_REPOSITORY}")"
-			SPCD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
-		else
-			spcd_error_ci "GITHUB_REPOSITORY"
-		fi
-		if [ -n "${GITHUB_REF_NAME}" ]; then
-			SPCD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
-		else
-			spcd_error_ci "GITHUB_REF_NAME"
-		fi
-	elif [ -n "${GITLAB_CI}" ]; then
-		# gitlab
-		if [ -n "${CI_SERVER_PROTOCOL}" ]; then
-			if [ -n "${CI_REGISTRY_USER}" ]; then
-				if [ -n "${CI_REGISTRY_PASSWORD}" ]; then
-					if [ -n "${CI_SERVER_FQDN}" ]; then
-						SPCD_PROJECT_ROOT="${CI_SERVER_PROTOCOL}\
-://${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}@${CI_SERVER_FQDN}"
-						if [ -n "${CI_PROJECT_NAMESPACE}" ]; then
-							SPCD_PROJECT_PATH="${CI_PROJECT_NAMESPACE}"
-							if [ -n "${CI_PROJECT_NAME}" ]; then
-								SPCD_PROJECT_NAME="${CI_PROJECT_NAME}"
-							else
-								spcd_error_ci "CI_PROJECT_NAME"
-							fi
-						else
-							spcd_error_ci "CI_PROJECT_NAMESPACE"
-						fi
-					else
-						spcd_error_ci "CI_SERVER_FQDN"
-					fi
-				else
-					spcd_error_ci "CI_REGISTRY_PASSWORD"
-				fi
-			else
-				spcd_error_ci "CI_REGISTRY_USER"
-			fi
-		else
-			spcd_error_ci "CI_SERVER_PROTOCOL"
-		fi
-		if [ -n "${CI_COMMIT_BRANCH}" ]; then
-			SPCD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
-		else
-			spcd_error_ci "CI_COMMIT_BRANCH"
-		fi
-	else
-		# unsupported
-		spcd_error_ci "ø"
-	fi
-	[ -n "${SPCD_PROJECT_ROOT}" ] || spcd_error_ci "SPCD_PROJECT_ROOT"
-	[ -n "${SPCD_PROJECT_PATH}" ] || spcd_error_ci "SPCD_PROJECT_PATH"
-	[ -n "${SPCD_PROJECT_NAME}" ] || spcd_error_ci "SPCD_PROJECT_NAME"
-	[ -n "${SPCD_PROJECT_BRANCH}" ] || spcd_error_ci "SPCD_PROJECT_BRANCH"
 	#
 	spcd_split
 	spcd_echo "SPCD_CA"
-	spcd_split
-	spcd_echo "SPCD_PROJECT_ROOT" \
-		"SPCD_PROJECT_PATH" "SPCD_PROJECT_NAME" "SPCD_PROJECT_BRANCH"
 	# TODO move to Python
 	case "${SPCD_PM}" in
 	"${SPCD_PM_APK}" | "${SPCD_PM_APT}") SPCD_PKG_SSH="openssh-client" ;;
@@ -447,6 +459,12 @@ Acquire::https::Verify-Peer False;
 	esac
 }
 
+spcd_list_working_directory() {
+	spcd_step "List working directory"
+	spcd_lwd__path="$(realpath .)"
+	spcd_ls "${spcd_lwd__path}"
+}
+
 spcd_set_packages_repositories() {
 	spcd_step "Set packages repositories"
 	case "${SPCD_OS_ID}" in
@@ -808,8 +826,8 @@ SPCD_BOX_RIGHT="╶"
 SPCD_BOX_UP="╰"
 SPCD_BOX_VERTICAL="│"
 
-SPCD_ERROR_CI=2
-SPCD_ERROR_OS=1
+SPCD_ERROR_CI=1
+SPCD_ERROR_OS=2
 
 SPCD_OS_ALMA="alma"
 SPCD_OS_ALPINE="alpine"