chore(ci): skip autorelease workflow on non-release PRs and release P…

…Rs without content changes (#219)

* chore(ci): skip autorelease workflow on non-release PRs

Source-Author: Stephanie Wang <stephaniewang526@users.noreply.github.com>
Source-Date: Thu Sep 24 16:57:32 2020 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 95dbe1bee3c7f7e52ddb24a54c37080620e0d1a2
Source-Link: googleapis/synthtool@95dbe1b

* chore(ci): verify autorelease release PR content has changes

Source-Author: Stephanie Wang <stephaniewang526@users.noreply.github.com>
Source-Date: Thu Sep 24 18:06:14 2020 -0400
Source-Repo: googleapis/synthtool
Source-Sha: da29da32b3a988457b49ae290112b74f14b713cc
Source-Link: googleapis/synthtool@da29da3

.github/workflows/auto-release.yaml

@@ -4,6 +4,7 @@ name: auto-release
 jobs:
   approve:
     runs-on: ubuntu-latest
+    if: contains(github.head_ref, 'release-v')
     steps:
     - uses: actions/github-script@v3.0.0
       with:
@@ -20,6 +21,24 @@ jobs:
             return;
           }
 
+          // only approve PRs with pom.xml and versions.txt changes
+          const filesPromise = github.pulls.listFiles.endpoint({
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            pull_number: context.payload.pull_request.number,
+          });
+          const changed_files = await github.paginate(filesPromise)
+
+          if ( changed_files.length < 1 ) {
+            console.log( "Not proceeding since PR is empty!" )
+            return;
+          }
+
+          if ( !changed_files.some(v => v.filename.includes("pom")) || !changed_files.some(v => v.filename.includes("versions.txt")) ) {
+            console.log( "PR file changes do not have pom.xml or versions.txt -- something is wrong. PTAL!" )
+            return;
+          }
+
           // trigger auto-release when
           // 1) it is a SNAPSHOT release (auto-generated post regular release)
           // 2) there are dependency updates only

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datastore.git",
-        "sha": "89fb0e7fb67857176b5d3ded3f0a5e2aaf76880b"
+        "sha": "1f028b47f36430b00ae17cbb80eee324b875e237"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "916c10e8581804df2b48a0f0457d848f3faa582e"
+        "sha": "da29da32b3a988457b49ae290112b74f14b713cc"
       }
     }
   ],