feat: detect default branch

README.md

@@ -109,6 +109,7 @@ release-please release-pr --package-name=@google-cloud/firestore" \
 | `--package-name`  | is the name of the package to publish to publish to  an upstream registry such as npm. |
 | `--repo-url`      | is the URL of the repository on GitHub.                 |
 | `--token`         | a token with write access to `--repo-url`.              |
+| `--default-branch`| branch to open pull release PR against (detected by default). |
 
 ### Creating a release on GitHub
 

__snapshots__/java-bom.js

@@ -819,21 +819,12 @@ exports['pom-bom'] = `
 </project>
 `
 
-exports['PR body-bom'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-## [0.124.0](https://www.github.com/googleapis/java-cloud-bom/compare/0.123.4...v0.124.0) 
-
-
-### Dependencies
-
-* update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/java-cloud-bom/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))
-* update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/java-cloud-bom/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['PR body-bom'] = {
+  'title': 'chore: release 0.124.0',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n## [0.124.0](https://www.github.com/googleapis/java-cloud-bom/compare/0.123.4...v0.124.0) \n\n\n### Dependencies\n\n* update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/java-cloud-bom/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))\n* update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/java-cloud-bom/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.124.0',
+  'base': 'main'
+}
 
 exports['labels-bom'] = {
   'labels': [
@@ -1603,15 +1594,12 @@ exports['pom-bom-snapshot'] = `
 </project>
 `
 
-exports['PR body-bom-snapshot'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-### Updating meta-information for bleeding-edge SNAPSHOT release.
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['PR body-bom-snapshot'] = {
+  'title': 'chore: release 0.123.5-SNAPSHOT',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n### Updating meta-information for bleeding-edge SNAPSHOT release.\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.123.5-SNAPSHOT',
+  'base': 'main'
+}
 
 exports['labels-bom-snapshot'] = {
   'labels': [
@@ -2444,25 +2432,12 @@ exports['pom-bom-feature'] = `
 </project>
 `
 
-exports['PR body-bom-feature'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-## [0.124.0](https://www.github.com/googleapis/java-cloud-bom/compare/0.123.4...v0.124.0) 
-
-
-### Features
-
-* import google-cloud-game-servers ([1f9663c](https://www.github.com/googleapis/java-cloud-bom/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))
-
-
-### Dependencies
-
-* update dependency com.google.cloud:google-cloud-storage to v1.120.1 ([fcd1c89](https://www.github.com/googleapis/java-cloud-bom/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['PR body-bom-feature'] = {
+  'title': 'chore: release 0.124.0',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n## [0.124.0](https://www.github.com/googleapis/java-cloud-bom/compare/0.123.4...v0.124.0) \n\n\n### Features\n\n* import google-cloud-game-servers ([1f9663c](https://www.github.com/googleapis/java-cloud-bom/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))\n\n\n### Dependencies\n\n* update dependency com.google.cloud:google-cloud-storage to v1.120.1 ([fcd1c89](https://www.github.com/googleapis/java-cloud-bom/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.124.0',
+  'base': 'master'
+}
 
 exports['labels-bom-feature'] = {
   'labels': [

__snapshots__/java-yoshi.js

@@ -476,20 +476,12 @@ exports['pom'] = `
 </project>
 `
 
-exports['PR body'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-### [0.20.4](https://www.github.com/googleapis/java-trace/compare/v0.20.3...v0.20.4) 
-
-
-### Bug Fixes
-
-* Fix declared dependencies from merge issue ([#291](https://www.github.com/googleapis/java-trace/issues/291)) ([35abf13](https://www.github.com/googleapis/java-trace/commit/35abf13fa8acb3988aa086f3eb23f5ce1483cc5d))
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['PR body'] = {
+  'title': 'chore: release 0.20.4',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n### [0.20.4](https://www.github.com/googleapis/java-trace/compare/v0.20.3...v0.20.4) \n\n\n### Bug Fixes\n\n* Fix declared dependencies from merge issue ([#291](https://www.github.com/googleapis/java-trace/issues/291)) ([35abf13](https://www.github.com/googleapis/java-trace/commit/35abf13fa8acb3988aa086f3eb23f5ce1483cc5d))\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.20.4',
+  'base': 'master'
+}
 
 exports['labels'] = {
   'labels': [
@@ -860,15 +852,12 @@ exports['pom-snapshot'] = `
 </project>
 `
 
-exports['PR body-snapshot'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-### Updating meta-information for bleeding-edge SNAPSHOT release.
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['PR body-snapshot'] = {
+  'title': 'chore: release 0.20.4-SNAPSHOT',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n### Updating meta-information for bleeding-edge SNAPSHOT release.\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.20.4-SNAPSHOT',
+  'base': 'main'
+}
 
 exports['labels-snapshot'] = {
   'labels': [

__snapshots__/release-pr-factory.js

@@ -16,21 +16,12 @@ exports['ReleasePRFactory build returns instance of dynamically loaded releaser
 
 `
 
-exports['ReleasePRFactory build returns instance of dynamically loaded releaser 3'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-### [0.123.5](https://www.github.com/googleapis/simple-test-repo/compare/v0.123.4...v0.123.5) 
-
-
-### Bug Fixes
-
-* **deps:** update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/simple-test-repo/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))
-* **deps:** update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/simple-test-repo/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['ReleasePRFactory build returns instance of dynamically loaded releaser 3'] = {
+  'title': 'chore: release 0.123.5',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n### [0.123.5](https://www.github.com/googleapis/simple-test-repo/compare/v0.123.4...v0.123.5) \n\n\n### Bug Fixes\n\n* **deps:** update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/simple-test-repo/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))\n* **deps:** update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/simple-test-repo/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.123.5',
+  'base': 'main'
+}
 
 exports['ReleasePRFactory build returns instance of dynamically loaded releaser 4'] = {
   'labels': [
@@ -56,21 +47,12 @@ exports['ReleasePRFactory buildStatic returns an instance of a statically loaded
 
 `
 
-exports['ReleasePRFactory buildStatic returns an instance of a statically loaded releaser 3'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-### [0.123.5](https://www.github.com/googleapis/simple-test-repo/compare/v0.123.4...v0.123.5) 
-
-
-### Bug Fixes
-
-* **deps:** update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/simple-test-repo/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))
-* **deps:** update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/simple-test-repo/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['ReleasePRFactory buildStatic returns an instance of a statically loaded releaser 3'] = {
+  'title': 'chore: release 0.123.5',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n### [0.123.5](https://www.github.com/googleapis/simple-test-repo/compare/v0.123.4...v0.123.5) \n\n\n### Bug Fixes\n\n* **deps:** update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/simple-test-repo/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))\n* **deps:** update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/simple-test-repo/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.123.5',
+  'base': 'main'
+}
 
 exports['ReleasePRFactory buildStatic returns an instance of a statically loaded releaser 4'] = {
   'labels': [

__snapshots__/release-pr.js

@@ -18,60 +18,9 @@ exports['GitHub Yoshi PHP Mono-Repo generates CHANGELOG and aborts if duplicate
 
 `
 
-exports['GitHub Yoshi PHP Mono-Repo generates CHANGELOG and aborts if duplicate 2'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-## 0.21.0
-
-<details><summary>automl 1.8.4</summary>
-
-
-
-### Bug Fixes
-
-* correctly label as beta ([#1963](https://www.github.com/googleapis/release-please/issues/1963)) ([52f4fbf](https://www.github.com/googleapis/release-please/commit/52f4fbfa1fc3fde585c84e64ef40571d2b85d72e))
-
-</details>
-
-<details><summary>datastore 2.0.1</summary>
-
-
-
-### Bug Fixes
-
-* Assorted minor fixes for Cloud Datastore client ([#1964](https://www.github.com/googleapis/release-please/issues/1964)) ([269cf92](https://www.github.com/googleapis/release-please/commit/269cf923ea6fd0375abaf0bb19790475693c6f90))
-
-</details>
-
-<details><summary>pubsub 1.0.2</summary>
-
-
-
-### Bug Fixes
-
-* Update PubSub timeouts. ([#1967](https://www.github.com/googleapis/release-please/issues/1967)) ([0a84771](https://www.github.com/googleapis/release-please/commit/0a8477108a26aeb21d7af06e62be4ae5cb00ad42))
-
-</details>
-
-<details><summary>speech 1.1.0</summary>
-
-
-
-### Features
-
-* move speech from alpha -> beta ([#1962](https://www.github.com/googleapis/release-please/issues/1962)) ([8db7f3b](https://www.github.com/googleapis/release-please/commit/8db7f3b19c46c873897d79c89ce35b8492e5fe60))
-
-</details>
-
-<details><summary>websecurityscanner 0.9.0</summary>
-
-
-
-### Features
-
-* Add Web Security Center Client ([#1961](https://www.github.com/googleapis/release-please/issues/1961)) ([fa5761e](https://www.github.com/googleapis/release-please/commit/fa5761e9e52f36506a72a9292843259d198468b0))
-
-</details>
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['GitHub Yoshi PHP Mono-Repo generates CHANGELOG and aborts if duplicate 2'] = {
+  'title': 'chore: release 0.21.0',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n## 0.21.0\n\n<details><summary>automl 1.8.4</summary>\n\n\n\n### Bug Fixes\n\n* correctly label as beta ([#1963](https://www.github.com/googleapis/release-please/issues/1963)) ([52f4fbf](https://www.github.com/googleapis/release-please/commit/52f4fbfa1fc3fde585c84e64ef40571d2b85d72e))\n\n</details>\n\n<details><summary>datastore 2.0.1</summary>\n\n\n\n### Bug Fixes\n\n* Assorted minor fixes for Cloud Datastore client ([#1964](https://www.github.com/googleapis/release-please/issues/1964)) ([269cf92](https://www.github.com/googleapis/release-please/commit/269cf923ea6fd0375abaf0bb19790475693c6f90))\n\n</details>\n\n<details><summary>pubsub 1.0.2</summary>\n\n\n\n### Bug Fixes\n\n* Update PubSub timeouts. ([#1967](https://www.github.com/googleapis/release-please/issues/1967)) ([0a84771](https://www.github.com/googleapis/release-please/commit/0a8477108a26aeb21d7af06e62be4ae5cb00ad42))\n\n</details>\n\n<details><summary>speech 1.1.0</summary>\n\n\n\n### Features\n\n* move speech from alpha -> beta ([#1962](https://www.github.com/googleapis/release-please/issues/1962)) ([8db7f3b](https://www.github.com/googleapis/release-please/commit/8db7f3b19c46c873897d79c89ce35b8492e5fe60))\n\n</details>\n\n<details><summary>websecurityscanner 0.9.0</summary>\n\n\n\n### Features\n\n* Add Web Security Center Client ([#1961](https://www.github.com/googleapis/release-please/issues/1961)) ([fa5761e](https://www.github.com/googleapis/release-please/commit/fa5761e9e52f36506a72a9292843259d198468b0))\n\n</details>\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.21.0',
+  'base': 'master'
+}

__snapshots__/simple.js

@@ -16,21 +16,12 @@ exports['version-txt-simple'] = `
 
 `
 
-exports['PR body-simple'] = `
-:robot: I have created a release \\*beep\\* \\*boop\\* 
----
-### [0.123.5](https://www.github.com/googleapis/simple-test-repo/compare/v0.123.4...v0.123.5) 
-
-
-### Bug Fixes
-
-* **deps:** update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/simple-test-repo/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))
-* **deps:** update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/simple-test-repo/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))
----
-
-
-This PR was generated with [Release Please](https://github.com/googleapis/release-please).
-`
+exports['PR body-simple'] = {
+  'title': 'chore: release 0.123.5',
+  'body': ':robot: I have created a release \\*beep\\* \\*boop\\* \n---\n### [0.123.5](https://www.github.com/googleapis/simple-test-repo/compare/v0.123.4...v0.123.5) \n\n\n### Bug Fixes\n\n* **deps:** update dependency com.google.cloud:google-cloud-spanner to v1.50.0 ([1f9663c](https://www.github.com/googleapis/simple-test-repo/commit/1f9663cf08ab1cf3b68d95dee4dc99b7c4aac373))\n* **deps:** update dependency com.google.cloud:google-cloud-storage to v1.120.0 ([fcd1c89](https://www.github.com/googleapis/simple-test-repo/commit/fcd1c890dc1526f4d62ceedad561f498195c8939))\n---\n\n\nThis PR was generated with [Release Please](https://github.com/googleapis/release-please).',
+  'head': 'release-v0.123.5',
+  'base': 'master'
+}
 
 exports['labels-simple'] = {
   'labels': [

src/bin/release-please.ts

@@ -68,6 +68,10 @@ const argv = yargs
           describe: 'is it a snapshot (or pre-release) being generated?',
           type: 'boolean',
           default: false,
+        })
+        .option('default-branch', {
+          describe: 'default branch to open release PR against',
+          type: 'string',
         });
     },
     (argv: ReleasePROptions) => {
@@ -140,6 +144,10 @@ const argv = yargs
     default: false,
     type: 'boolean',
   })
+  .option('default-branch', {
+    describe: '',
+    type: 'string',
+  })
   .demandCommand(1)
   .strict(true)
   .parse();

src/github.ts

@@ -65,6 +65,7 @@ export interface OctokitAPIs {
 }
 
 interface GitHubOptions {
+  defaultBranch?: string;
   token?: string;
   owner: string;
   repo: string;
@@ -108,6 +109,7 @@ interface FileSearchResponseFile {
 let probotMode = false;
 
 export class GitHub {
+  defaultBranch?: string;
   octokit: OctokitType;
   request: Function;
   graphql: Function;
@@ -118,6 +120,7 @@ export class GitHub {
   proxyKey?: string;
 
   constructor(options: GitHubOptions) {
+    this.defaultBranch = options.defaultBranch;
     this.token = options.token;
     this.owner = options.owner;
     this.repo = options.repo;
@@ -674,7 +677,7 @@ export class GitHub {
     }
 
     await this.updateFiles(options.updates, options.branch, refName);
-
+    const base = await this.getDefaultBranch(this.owner, this.repo);
     if (openReleasePR) {
       // TODO: dig into why `updateRef` closes an issue attached
       // to the branch being updated:
@@ -696,7 +699,7 @@ export class GitHub {
           title: options.title,
           body: options.body,
           state: 'open',
-          base: 'master',
+          base,
         }
       );
       return openReleasePR.number;
@@ -715,13 +718,25 @@ export class GitHub {
           title: options.title,
           body: options.body,
           head: options.branch,
-          base: 'master',
+          base,
         }
       );
       return resp.data.number;
     }
   }
 
+  private async getDefaultBranch(owner: string, repo: string): Promise<string> {
+    if (this.defaultBranch) {
+      return this.defaultBranch;
+    }
+    const {data} = await this.octokit.repos.get({
+      repo,
+      owner,
+    });
+    this.defaultBranch = data.default_branch;
+    return this.defaultBranch;
+  }
+
   async updateFiles(updates: Update[], branch: string, refName: string) {
     // does the user care about skipping CI at all?
     const skipCiEverSet = updates.some(

src/graphql-to-commits.ts

@@ -94,8 +94,6 @@ export async function graphqlToCommits(
       commitEdge,
       observedSHAs
     );
-    // if the commit and its associated PR do not share a sha, we assume
-    // that the commit was a push to master and disregard it.
     if (commit) {
       commits.commits.push(commit);
     }
@@ -124,7 +122,7 @@ async function graphqlToCommit(
   let prEdge: PREdge = commitEdge.node.associatedPullRequests.edges[0];
 
   // if the commit.sha and mergeCommit.oid do not match, assume that this
-  // was a push to master and drop the commit.
+  // was a push directly to the default branch.
   //
   // TODO: investigate our motivations for skipping commits when
   // commitEdge.node.oid and prEdge.node.mergeCommit.oid do not match (this