Add script to update release tracker on pr merge (#21)

Signed-off-by: Tamal Saha <tamal@appscode.com>

Author: tamalsaha

.github/workflows/release-tracker.yml

@@ -0,0 +1,36 @@
+name: release-tracker
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Prepare git
+        env:
+          GITHUB_USER: 1gtm
+          GITHUB_TOKEN: ${{ secrets.LGTM_GITHUB_TOKEN }}
+        run: |
+          git config --global user.name "${GITHUB_USER}"
+          git config --global user.email "${GITHUB_USER}@appscode.com"
+          git remote set-url origin https://${GITHUB_USER}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git
+
+      - name: Install GitHub CLI
+        run: |
+          curl -fsSL https://github.com/github/hub/raw/master/script/get | bash -s 2.14.1
+          sudo mv bin/hub /usr/local/bin
+
+      - name: Update release tracker
+        if: |
+          github.event.action == 'closed' &&
+          github.event.pull_request.merged == true
+        env:
+          GITHUB_USER: 1gtm
+          GITHUB_TOKEN: ${{ secrets.LGTM_GITHUB_TOKEN }}
+        run: |
+          ./hack/scripts/update-release-tracker.sh

hack/scripts/update-release-tracker.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# Copyright The Stash Authors.
+#
+# 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 -eou pipefail
+
+# ref: https://gist.github.com/joshisa/297b0bc1ec0dcdda0d1625029711fa24
+parse_url() {
+    proto="$(echo $1 | grep :// | sed -e's,^\(.*://\).*,\1,g')"
+    # remove the protocol
+    url="$(echo ${1/$proto/})"
+
+    IFS='/'                  # / is set as delimiter
+    read -ra PARTS <<<"$url" # str is read into an array as tokens separated by IFS
+    if [ ${PARTS[0]} != 'github.com' ] || [ ${#PARTS[@]} -ne 5 ]; then
+        echo "failed to parse relase-tracker: $url"
+        exit 1
+    fi
+    export RELEASE_TRACKER_OWNER=${PARTS[1]}
+    export RELEASE_TRACKER_REPO=${PARTS[2]}
+    export RELEASE_TRACKER_PR=${PARTS[4]}
+}
+
+RELEASE_TRACKER=
+
+while IFS=$': \t' read -r -u9 marker v; do
+    case $marker in
+        Release-tracker)
+            export RELEASE_TRACKER=$v
+            ;;
+        Release)
+            export RELEASE=$v
+            ;;
+    esac
+done 9< <(git show -s --format=%b)
+
+[ ! -z $RELEASE_TRACKER ] || {
+    echo "Release-tracker url not found."
+    exit 0
+}
+
+parse_url $RELEASE_TRACKER
+api_url="repos/${RELEASE_TRACKER_OWNER}/${RELEASE_TRACKER_REPO}/issues/${RELEASE_TRACKER_PR}/comments"
+
+case $GITHUB_BASE_REF in
+    master)
+        msg="/ready-to-tag github.com/${GITHUB_REPOSITORY} ${GITHUB_SHA}"
+        ;;
+    *)
+        msg="/cherry-picked github.com/${GITHUB_REPOSITORY} ${GITHUB_REF} ${GITHUB_SHA}"
+        ;;
+esac
+
+hub api "$api_url" -f body="$msg"