feat: Restart salt-master on config changes

Automatically restart salt-master when config changes are detected.

tests/config-reloader/README.md

@@ -0,0 +1,5 @@
+# Config Reloader Tests
+
+Checks:
+
+  - `salt-master` is reloaded after config changes

tests/config-reloader/config/fileserver.conf

@@ -0,0 +1,2 @@
+# The buffer size in the file server can be adjusted here:
+file_buffer_size: 1048576

tests/config-reloader/test.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+set -e
+[ "${DEBUG}" == true ] && set -vx
+
+echo "🧪 Running config-reloader tests ..."
+
+# https://stackoverflow.com/a/4774063/3398062
+SCRIPT_PATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+
+# shellcheck source=assets/build/functions.sh
+COMMON_FILE="${SCRIPT_PATH}/../lib/common.sh"
+source "${COMMON_FILE}"
+trap cleanup EXIT
+
+# Run test instance
+echo "==> Starting docker-salt-master (${PLATFORM}) ..."
+start_container_and_wait \
+  --env SALT_RESTART_MASTER_ON_CONFIG_CHANGE=true \
+  --volume "${SCRIPT_PATH}/config":/home/salt/data/config:ro \
+|| error "container started"
+ok "container started"
+
+# Get initial configuration values
+echo "==> Checking initial configuration values ..."
+FILE_BUFFER_SIZE="$(salt-run config.get file_buffer_size)"
+YAML_UTF8="$(salt-run config.get yaml_utf8)"
+
+FILE_BUFFER_SIZE_EXPECTED=1048576
+YAML_UTF8_EXPECTED=
+
+check_equal "${FILE_BUFFER_SIZE}" "${FILE_BUFFER_SIZE_EXPECTED}" "file_buffer_size"
+check_equal "${YAML_UTF8}" "${YAML_UTF8_EXPECTED}" "yaml_utf8"
+
+# Update fileserver config
+echo "==> Updating file_buffer_size config ..."
+FILE_BUFFER_SIZE_EXPECTED=2097152
+sed -i "s/file_buffer_size:.*/file_buffer_size: ${FILE_BUFFER_SIZE_EXPECTED}/" "${SCRIPT_PATH}/config/fileserver.conf"
+sleep 30 # Wait for the config to be reloaded
+
+FILE_BUFFER_SIZE="$(salt-run config.get file_buffer_size)"
+check_equal "${FILE_BUFFER_SIZE}" "${FILE_BUFFER_SIZE_EXPECTED}" "file_buffer_size"
+
+# Create yaml_utf8 config
+echo "==> Creating yaml_utf8 config ..."
+YAML_UTF8_EXPECTED=True
+cat > "${SCRIPT_PATH}/config/yaml_utf8.conf" <<EOF
+# Enable extra routines for YAML renderer used states containing UTF characters.
+yaml_utf8: ${YAML_UTF8_EXPECTED}
+EOF
+sleep 30 # Wait for the config to be reloaded
+
+YAML_UTF8="$(salt-run config.get yaml_utf8)"
+check_equal "${YAML_UTF8}" "${YAML_UTF8_EXPECTED}" "yaml_utf8"

tests/lib/common.sh

@@ -43,6 +43,15 @@ function docker-exec()
   docker exec "${CONTAINER_NAME}" "$@"
 }
 
+#---  FUNCTION  -------------------------------------------------------------------------------------------------------
+#          NAME:  docker-logs
+#   DESCRIPTION:  Get the logs of the container.
+#----------------------------------------------------------------------------------------------------------------------
+function docker-logs()
+{
+  docker logs "${CONTAINER_NAME}"
+}
+
 #---  FUNCTION  -------------------------------------------------------------------------------------------------------
 #          NAME:  salt-run
 #   DESCRIPTION:  Execute the salt-run command inside the container.
@@ -107,3 +116,27 @@ function error()
   master_log
   return 1
 }
+
+#---  FUNCTION  -------------------------------------------------------------------------------------------------------
+#          NAME:  check_equal
+#   DESCRIPTION:  Check if the given value is equal to the expected value.
+#----------------------------------------------------------------------------------------------------------------------
+function check_equal()
+{
+  local actual="$1"
+  local expected="$2"
+  local message="$3"
+
+  output=$(cat <<EOF
+${message}
+  Expected: ${expected}
+    Actual: ${actual}
+EOF
+)
+
+  if [[ "${actual}" == "${expected}" ]]; then
+    ok "${output}"
+  else
+    error "${output}"
+  fi
+}