Add get_config_file function

src/rsync_offsite_backup.sh

@@ -359,24 +359,25 @@ function get_3rd_parties_versions() {
   export YQ_VER
 }
 
+function get_config_file() {
+  if [[ ! -r "${CONFIG_FILE}" ]]; then
+    _error "Given config file path is invalid: '${CONFIG_FILE}'"
+    exit 1
+  fi
+
+  if which envsubst 1>/dev/null 2>&1; then
+    envsubst <"${CONFIG_FILE}"
+  else
+    cat "${CONFIG_FILE}"
+  fi
+}
+
 return 0 # FIXME: Remove
 
 #
 # Read config
 #
-if [[ ! -r "${CONFIG_FILE}" ]]
-then
-  echo "ERROR: Given config file path is invalid: '${CONFIG_FILE}'" >&2
-  exit 1
-fi
-
-if which envsubst 1>/dev/null 2>&1
-then
-  readonly _CONF="$(envsubst < "${CONFIG_FILE}")"
-else
-  readonly _CONF="$(cat "${CONFIG_FILE}")"
-fi
-
+_CONF=''
 readonly SSH_KEY="$(echo "${_CONF}" | dasel --null -c '.ssh.key' -p yaml 2>/dev/null)"
 readonly SSH_HOST="$(echo "${_CONF}" | dasel --null -c '.ssh.host' -p yaml 2>/dev/null)"
 readonly SSH_PORT="$(echo "${_CONF}" | dasel --null -c '.ssh.port' -p yaml 2>/dev/null)"

test/test_config.bats

@@ -0,0 +1,59 @@
+#!/usr/bin/env bats
+
+setup() {
+  load 'test_helper/common-setup'
+  _common_setup
+
+  export TMPFILE="$(mktemp)"
+}
+
+teardown() {
+  rm -f "${TMPFILE}"
+  unset CONFIG_FILE
+  unset TMPFILE
+}
+
+# get_config_file --------------------------------------------------------------
+
+@test "get_config_file should fail with error message for unreadable path" {
+  # GIVEN
+  export CONFIG_FILE='./inexistent/path'
+
+  # WHEN
+  run get_config_file
+
+  # THEN
+  assert_failure
+  assert_output --partial "Given config file path is invalid: '${CONFIG_FILE}'"
+}
+
+@test "get_config_file should output config file contents if path is valid" {
+  # GIVEN
+  given_config_contents=$'foo bar\nlorem ipsum'
+  echo "${given_config_contents}" >"${TMPFILE}"
+  export CONFIG_FILE="${TMPFILE}"
+
+  # WHEN
+  run get_config_file
+
+  # THEN
+  assert_success
+  assert_output "${given_config_contents}"
+}
+
+@test "get_config_file should output config file contents through envsubst" {
+  # GIVEN
+  given_config_contents=$'foo bar\nlorem ipsum'
+  echo "${given_config_contents}" >"${TMPFILE}"
+  export CONFIG_FILE="${TMPFILE}"
+
+  # MOCK
+  envsubst() { echo "lorem ipsum config:$(</dev/stdin)"; }
+
+  # WHEN
+  run get_config_file
+
+  # THEN
+  assert_success
+  assert_output "lorem ipsum config:${given_config_contents}"
+}