diff --git a/__test__/git-directory-helper.test.ts b/__test__/git-directory-helper.test.ts
index fac861929..7283102d3 100644
--- a/__test__/git-directory-helper.test.ts
+++ b/__test__/git-directory-helper.test.ts
@@ -416,6 +416,7 @@ async function setup(testName: string): Promise<void> {
     log1: jest.fn(),
     remoteAdd: jest.fn(),
     removeEnvironmentVariable: jest.fn(),
+    revParse: jest.fn(),
     setEnvironmentVariable: jest.fn(),
     shaExists: jest.fn(),
     submoduleForeach: jest.fn(),
diff --git a/dist/index.js b/dist/index.js
index 2a73e3852..3dab1d1c4 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -3515,7 +3515,7 @@ function testRef(git, ref, commit) {
         if (upperRef.startsWith('REFS/HEADS/')) {
             const branch = ref.substring('refs/heads/'.length);
             return ((yield git.branchExists(true, `origin/${branch}`)) &&
-                commit === (yield git.getCommitSha(`refs/remotes/origin/${branch}`)));
+                commit === (yield git.revParse(`refs/remotes/origin/${branch}`)));
         }
         // refs/pull/
         else if (upperRef.startsWith('REFS/PULL/')) {
@@ -3525,8 +3525,7 @@ function testRef(git, ref, commit) {
         // refs/tags/
         else if (upperRef.startsWith('REFS/TAGS/')) {
             const tagName = ref.substring('refs/tags/'.length);
-            return ((yield git.tagExists(tagName)) &&
-                commit === (yield git.getCommitSha(commit)));
+            return ((yield git.tagExists(tagName)) && commit === (yield git.revParse(ref)));
         }
         // Unexpected
         else {
@@ -5831,17 +5830,6 @@ class GitCommandManager {
             }));
         });
     }
-    getCommitSha(ref) {
-        return __awaiter(this, void 0, void 0, function* () {
-            const output = yield this.execGit([
-                'log',
-                '-1',
-                '--format=format:%H%n',
-                ref
-            ]);
-            return output.stdout.trim();
-        });
-    }
     getWorkingDirectory() {
         return this.workingDirectory;
     }
@@ -5885,6 +5873,18 @@ class GitCommandManager {
     removeEnvironmentVariable(name) {
         delete this.gitEnv[name];
     }
+    /**
+     * Resolves a ref to a SHA. For a branch or lightweight tag, the commit SHA is returned.
+     * For an annotated tag, the tag SHA is returned.
+     * @param {string} ref  For example: 'refs/heads/master' or '/refs/tags/v1'
+     * @returns {Promise<string>}
+     */
+    revParse(ref) {
+        return __awaiter(this, void 0, void 0, function* () {
+            const output = yield this.execGit(['rev-parse', ref]);
+            return output.stdout.trim();
+        });
+    }
     setEnvironmentVariable(name, value) {
         this.gitEnv[name] = value;
     }
diff --git a/src/git-command-manager.ts b/src/git-command-manager.ts
index 24f67fbcd..d4e305a13 100644
--- a/src/git-command-manager.ts
+++ b/src/git-command-manager.ts
@@ -25,7 +25,6 @@ export interface IGitCommandManager {
   ): Promise<void>
   configExists(configKey: string, globalConfig?: boolean): Promise<boolean>
   fetch(refSpec: string[], fetchDepth?: number): Promise<void>
-  getCommitSha(ref: string): Promise<string>
   getWorkingDirectory(): string
   init(): Promise<void>
   isDetached(): Promise<boolean>
@@ -34,6 +33,7 @@ export interface IGitCommandManager {
   log1(): Promise<string>
   remoteAdd(remoteName: string, remoteUrl: string): Promise<void>
   removeEnvironmentVariable(name: string): void
+  revParse(ref: string): Promise<string>
   setEnvironmentVariable(name: string, value: string): void
   shaExists(sha: string): Promise<boolean>
   submoduleForeach(command: string, recursive: boolean): Promise<string>
@@ -195,16 +195,6 @@ class GitCommandManager {
     })
   }
 
-  async getCommitSha(ref: string): Promise<string> {
-    const output = await this.execGit([
-      'log',
-      '-1',
-      '--format=format:%H%n',
-      ref
-    ])
-    return output.stdout.trim()
-  }
-
   getWorkingDirectory(): string {
     return this.workingDirectory
   }
@@ -248,6 +238,17 @@ class GitCommandManager {
     delete this.gitEnv[name]
   }
 
+  /**
+   * Resolves a ref to a SHA. For a branch or lightweight tag, the commit SHA is returned.
+   * For an annotated tag, the tag SHA is returned.
+   * @param {string} ref  For example: 'refs/heads/master' or '/refs/tags/v1'
+   * @returns {Promise<string>}
+   */
+  async revParse(ref: string): Promise<string> {
+    const output = await this.execGit(['rev-parse', ref])
+    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 87eefae3e..18780a59a 100644
--- a/src/ref-helper.ts
+++ b/src/ref-helper.ts
@@ -158,7 +158,7 @@ export async function testRef(
     const branch = ref.substring('refs/heads/'.length)
     return (
       (await git.branchExists(true, `origin/${branch}`)) &&
-      commit === (await git.getCommitSha(`refs/remotes/origin/${branch}`))
+      commit === (await git.revParse(`refs/remotes/origin/${branch}`))
     )
   }
   // refs/pull/
@@ -170,8 +170,7 @@ 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.getCommitSha(commit))
+      (await git.tagExists(tagName)) && commit === (await git.revParse(ref))
     )
   }
   // Unexpected