Reorganize tests

* Split out test helper functions into tools/test_functions.sh
  * bin/_blackbox_common_test.sh: Unit-tests for functions.
  * blackbox_postdeploy: Use cp_permissions instead of chmod --reference

bin/_blackbox_common.sh

@@ -380,6 +380,23 @@ function md5sum_file() {
   esac
 }
 
+function cp_permissions() {
+  # Copy the perms of $1 onto $2 .. end.
+  case $(uname -s) in
+    Darwin )
+      chmod $( stat -f '%p' "$1" ) "${@:2}"
+      ;;
+    Linux | CYGWIN* )
+      chmod --reference "$1" "${@:2}"
+      ;;
+    * )
+      echo 'ERROR: Unknown OS. Exiting.'
+      exit 1
+      ;;
+  esac
+}
+
+
 #
 # Abstract the difference between git and hg:
 #

bin/_blackbox_common_test.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+#
+# _blackbox_common_test.sh -- Unit tests of functions from _blackbox_common.sh
+#
+
+set -e
+. "${0%/*}/_blackbox_common.sh"
+. tools/test_functions.sh
+
+PHASE 'Test cp-permissions: TestA'
+touch TestA TestB TestC TestD
+chmod 0347 TestA
+chmod 0700 TestB
+chmod 0070 TestC
+chmod 0070 TestD
+cp_permissions TestA TestB TestC
+assert_file_perm '--wxr--rwx' TestA
+assert_file_perm '--wxr--rwx' TestB
+assert_file_perm '--wxr--rwx' TestC
+assert_file_perm '----rwx---' TestD
+
+echo '========== DONE.'

bin/blackbox_postdeploy

@@ -30,7 +30,7 @@ echo '========== Decrypting new/changed files: START'
 while IFS= read <&99 -r unencrypted_file; do
   encrypted_file=$(get_encrypted_filename "$unencrypted_file")
   decrypt_file_overwrite "$encrypted_file" "$unencrypted_file"
-  chmod --reference "$encrypted_file" "$unencrypted_file"
+  cp_permissions "$encrypted_file" "$unencrypted_file"
   if [[ ! -z "$FILE_GROUP" ]]; then
     chmod g+r "$unencrypted_file"
     chgrp "$FILE_GROUP" "$unencrypted_file"