fixing git-release file to ignore error if tag already exists

Signed-off-by: mayank <mayank.patel@mayadata.io>

.travis.yml

@@ -40,7 +40,7 @@ before_install:
     - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
     - sudo apt-get update -qq
     - sudo apt-get install --yes -qq gcc-6 g++-6
-    - sudo apt-get install --yes -qq build-essential autoconf libtool gawk alien fakeroot libaio-dev
+    - sudo apt-get install --yes -qq build-essential autoconf libtool gawk alien fakeroot libaio-dev jq
     # linux-header package name is different on arm. 
     - if [ "$TRAVIS_CPU_ARCH" == "arm64" ]; then
         sudo apt-get install --yes -qq linux-headers-generic;

buildscripts/git-release

@@ -1,4 +1,18 @@
 #!/bin/bash
+# Copyright 2020 The OpenEBS Authors. 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.
+
 set -e
 
 if [ "$#" -ne 3 ]; then
@@ -46,6 +60,24 @@ RELEASE_CREATE_JSON=$(echo \
 TEMP_RESP_FILE=temp-curl-response.txt
 rm -rf ${TEMP_RESP_FILE}
 
+#is_release_already_exist verifies the output of API for error message
+#return 0 -- if release already exist
+#return 1 -- if release doesn't exist
+is_release_already_exist() {
+	dfile=$1
+
+	msg=$(cat $dfile | jq -r '.message')
+	code=$(cat $dfile | jq -r '.errors[0].code')
+	resource=$(cat $dfile | jq -r '.errors[0].resource')
+	error_len=$(cat $dfile | jq '.errors | length')
+
+	[[ "$msg" == "Validation Failed" ]] && \
+		[[ "$code" == "already_exists" ]] && \
+		[[ "$resource" -eq "Release" ]] && \
+		[[ $error_len -eq 1 ]] && \
+		echo 0 || echo 1
+}
+
 response_code=$(curl -u ${GIT_NAME}:${GIT_TOKEN} \
  -w "%{http_code}" \
  --silent \
@@ -62,7 +94,7 @@ rc_code=0
 #Github returns 201 Created on successfully creating a new release
 #201 means the request has been fulfilled and has resulted in one 
 #or more new resources being created.
-if [ $response_code != "201" ]; then
+if [ $response_code != "201" ] && [[ $(is_release_already_exist $TEMP_RESP_FILE) -ne 0 ]]; then
     echo "Error: Unable to create release. See below response for more details"
     #The GitHub error response is pretty well formatted.
     #Printing the body gives all the details to fix the errors
@@ -84,6 +116,8 @@ else
     #knowing that creation worked is all that matters now.
     echo "Successfully tagged $1 with release tag ${C_GIT_TAG_NAME} on branch ${C_GIT_TAG_BRANCH}"
 fi
+
+
 cat ${TEMP_RESP_FILE}
 
 #delete the temporary response file