Use rev-list for tagsluketomlinson/tags

2 files changed, 13 insertions, 1 deletions

diff --git a/src/git-command-manager.ts b/src/git-command-manager.ts
index ab07524..8e6b901 100644
--- a/src/git-command-manager.ts
+++ b/src/git-command-manager.ts
@@ -35,6 +35,7 @@ export interface IGitCommandManager {
   log1(format?: string): Promise<string>
   remoteAdd(remoteName: string, remoteUrl: string): Promise<void>
   removeEnvironmentVariable(name: string): void
+  revList(ref: string, numberOfRefs: number): Promise<string>
   revParse(ref: string): Promise<string>
   setEnvironmentVariable(name: string, value: string): void
   shaExists(sha: string): Promise<boolean>
@@ -314,6 +315,17 @@ class GitCommandManager {
     return output.stdout.trim()
   }
 
+  /**
+   * Lists SHAs pointed to by a revision.
+   * @param {string} ref  For example: 'refs/heads/main' or '/refs/tags/v1'
+   * @param {number} numberOfRefs
+   * @param value
+   */
+  async revList(ref: string, numberOfRefs: number): Promise<string> {
+    const output = await this.execGit(['rev-list', ref, `-${numberOfRefs}`])
+    return output.stdout.trim()
+  }
+
   setEnvironmentVariable(name: string, value: string): void {
     this.gitEnv[name] = value
   }
diff --git a/src/ref-helper.ts b/src/ref-helper.ts
index 1c25049..149989a 100644
--- a/src/ref-helper.ts
+++ b/src/ref-helper.ts
@@ -167,7 +167,7 @@ export async function testRef(
   else if (upperRef.startsWith('REFS/TAGS/')) {
     const tagName = ref.substring('refs/tags/'.length)
     return (
-      (await git.tagExists(tagName)) && commit === (await git.revParse(ref))
+      (await git.tagExists(tagName)) && commit === (await git.revList(ref, 1))
     )
   }
   // Unexpected