Add die() to tct/common.sh

This function takes up to two arguments:
    1. error message
    2. exit code (default: 1)

Example: test -n "$1" || die "No arguments!" 5
If variable $1 is not set, "No arguments!" will be printed on stderr
and script in which it was invoked will exit with exit code equal to 5.

Change-Id: I7993d1ab3be9025853f50d86c7dc5bc120ecec7e
Signed-off-by: Aleksander Mistewicz <a.mistewicz@samsung.com>

diff --git a/tct/common.sh b/tct/common.sh
new file mode 100755 (executable)
index 0000000..eee0399
--- /dev/null
+++ b/tct/common.sh
@@ -0,0 +1,28 @@
+# Copyright (c) 2015 Samsung Electronics Co., Ltd All Rights Reserved
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This function takes up to two arguments:
+#         1. error message
+#         2. exit code (default: 1)
+#
+# Example: test -n "$VAR" || die "VAR is not set!" 5
+# If variable $VAR is not set, "VAR is not set!" will be printed on stderr
+# and script in which it was invoked will exit with exit code equal to 5.
+#
+# Author: Aleksander Mistewicz <a.mistewicz@samsung.com>
+
+die() {
+    printf >&2 -- '%s\n' "$1"
+    exit ${2:-1}
+}