feat: allow forcing latest tag

src/bin/release-please.ts

@@ -104,6 +104,18 @@ function releaserCommon(ya: YargsOptionsBuilder) {
     default: 'CHANGELOG.md',
     describe: 'where can the CHANGELOG be found in the project?',
   });
+  ya.option('latest-tag-version', {
+    describe: 'Override the detected latest tag version',
+    type: 'string',
+  });
+  ya.option('latest-tag-sha', {
+    describe: 'Override the detected latest tag SHA',
+    type: 'string',
+  });
+  ya.option('latest-tag-name', {
+    describe: 'Override the detected latest tag name',
+    type: 'string',
+  });
 }
 
 function releaseType(ya: YargsOptionsBuilder, defaultType?: string) {

src/factory.ts

@@ -261,11 +261,27 @@ function releasePR(options: ReleasePRFactoryOptions): ReleasePR {
   const [GHFactoryOptions, RPFactoryOptions] = getGitHubFactoryOpts(options);
   const github = gitHubInstance(GHFactoryOptions);
 
-  const {releaseType, label, ...RPConstructorOptions} = RPFactoryOptions;
+  const {
+    releaseType,
+    label,
+    latestTagName,
+    latestTagSha,
+    latestTagVersion,
+    ...RPConstructorOptions
+  } = RPFactoryOptions;
+  let latestTag: GitHubTag | undefined = undefined;
+  if (latestTagName && latestTagSha && latestTagVersion) {
+    latestTag = {
+      name: latestTagName,
+      sha: latestTagSha,
+      version: latestTagVersion,
+    };
+  }
   const labels = getLabels(label);
   return new (factory.releasePRClass(releaseType))({
     github,
     labels,
+    latestTag,
     ...RPConstructorOptions,
   });
 }

src/index.ts

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import {OctokitAPIs, GitHub} from './github';
+import {OctokitAPIs, GitHub, GitHubTag} from './github';
 import {ReleaseType} from './releasers';
 import {ReleasePR} from './release-pr';
 import {ChangelogSection} from './conventional-commits';
@@ -122,6 +122,7 @@ export interface ReleasePRConstructorOptions
     ReleaserConstructorOptions {
   labels?: string[];
   skipDependencyUpdates?: boolean;
+  latestTag?: GitHubTag;
 }
 
 // GitHubRelease Constructor options
@@ -152,6 +153,9 @@ export interface ReleasePRFactoryOptions
     GitHubFactoryOptions,
     ReleaserFactory {
   label?: string;
+  latestTagName?: string;
+  latestTagSha?: string;
+  latestTagVersion?: string;
 }
 
 // GitHubRelease factory/builder options

src/release-pr.ts

@@ -89,6 +89,7 @@ export class ReleasePR {
   extraFiles: string[];
   forManifestReleaser: boolean;
   enableSimplePrereleaseParsing = false;
+  latestTagOverride?: GitHubTag;
   signoff?: string;
 
   constructor(options: ReleasePRConstructorOptions) {
@@ -115,6 +116,7 @@ export class ReleasePR {
     this.signoff = options.signoff;
     this.extraFiles = options.extraFiles ?? [];
     this.forManifestReleaser = options.skipDependencyUpdates ?? false;
+    this.latestTagOverride = options.latestTag;
   }
 
   // A releaser can override this method to automatically detect the
@@ -603,6 +605,10 @@ export class ReleasePR {
     prefix?: string,
     preRelease = false
   ): Promise<GitHubTag | undefined> {
+    if (this.latestTagOverride) {
+      return this.latestTagOverride;
+    }
+
     const branchPrefix = prefix?.endsWith('-')
       ? prefix.replace(/-$/, '')
       : prefix;