feat: Restart salt-master on config changes

Automatically restart salt-master when config changes are detected.

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"