Updated release pipeline script to create tags for releases off patch…

… branches in the format: 20190730.1-patch1

vsts/pipelines/templates/_releaseJobTemplate.yml

@@ -45,10 +45,14 @@ jobs:
     inputs:
       artifactName: drop
 
+  - task: ShellScript@2
+    inputs:
+      scriptPath: vsts/scripts/createReleaseTag.sh
+
   - task: GitHubRelease@0
     displayName: 'GitHub release (create)'
     inputs:
       gitHubConnection: 'Oryx-GitHub'
       repositoryName: Microsoft/Oryx
       tagSource: manual
-      tag: '$(Build.BuildNumber)'
+      tag: '$(ReleaseTagName)'

vsts/scripts/createReleaseTag.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+set -ex
+sourceBranch="$BUILD_SOURCEBRANCHNAME"
+
+if [ "$sourceBranch" == "master" ]; then
+    echo "##vso[task.setvariable variable=ReleaseTagName;]$BUILD_BUILDNUMBER"
+elif [[ "$sourceBranch" == patch/* ]]; then
+    IFS=/
+    read -ra branchNameParts <<< "$sourceBranch"
+
+    # Name of the tag which is being patched (ex: 20190730.1)
+    patchedTagName=${branchNameParts[1]}
+
+    # We want tags for patch releases in the format: 20190730.1-patch1, 20190730.1-patch2 etc.
+    baseReleaseTagUrl="https://github.com/microsoft/Oryx/releases/tag"
+    patchNumber=0
+
+    # Increment patch numbers until we find one for which we have not created a release already
+    while true; do
+        patchNumber=$((patchNumber + 1))
+        fullPatchTagName="$patchedTagName-patch$patchNumber"
+        releaseUrl="$baseReleaseTagUrl/$fullPatchTagName"
+
+        curl -I "$releaseUrl" 1> /tmp/createReleaseTag.txt 2> /dev/null
+        grep "HTTP/1.1 404 Not Found" /tmp/createReleaseTag.txt &> /dev/null
+        exitCode=$?
+        rm -f /tmp/createReleaseTag.txt
+        if [ $exitCode -eq 0 ]; then
+            echo "##vso[task.setvariable variable=ReleaseTagName;]$fullPatchTagName"
+            break
+        fi
+    done
+fi