Gracefully handle gpg signature info in git log output

node-src/git/git.test.ts

@@ -1,12 +1,49 @@
 import { execaCommand } from 'execa';
 import { describe, expect, it, vi } from 'vitest';
 
-import { getSlug } from './git';
+import { getCommit, getSlug, hasPreviousCommit } from './git';
 
 vi.mock('execa');
 
 const command = vi.mocked(execaCommand);
 
+describe('getCommit', () => {
+  it('parses log output', async () => {
+    command.mockImplementation(
+      () =>
+        Promise.resolve({
+          all: `19b6c9c5b3d34d9fc55627fcaf8a85bd5d5e5b2a ## 1696588814 ## info@ghengeveld.nl ## Gert Hengeveld`,
+        }) as any
+    );
+    expect(await getCommit()).toEqual({
+      commit: '19b6c9c5b3d34d9fc55627fcaf8a85bd5d5e5b2a',
+      committedAt: 1696588814 * 1000,
+      committerEmail: 'info@ghengeveld.nl',
+      committerName: 'Gert Hengeveld',
+    });
+  });
+
+  it('ignores gpg signature information', async () => {
+    command.mockImplementation(
+      () =>
+        Promise.resolve({
+          all: `
+gpg: Signature made Fri Oct  6 12:40:14 2023 CEST
+gpg:                using RSA key 4AEE18F83AFDEB23
+gpg: Can't check signature: No public key
+19b6c9c5b3d34d9fc55627fcaf8a85bd5d5e5b2a ## 1696588814 ## info@ghengeveld.nl ## Gert Hengeveld
+          `.trim(),
+        }) as any
+    );
+    expect(await getCommit()).toEqual({
+      commit: '19b6c9c5b3d34d9fc55627fcaf8a85bd5d5e5b2a',
+      committedAt: 1696588814 * 1000,
+      committerEmail: 'info@ghengeveld.nl',
+      committerName: 'Gert Hengeveld',
+    });
+  });
+});
+
 describe('getSlug', () => {
   it('returns the slug portion of the git url', async () => {
     command.mockImplementation(
@@ -25,3 +62,32 @@ describe('getSlug', () => {
     expect(await getSlug()).toBe('foo/bar.baz');
   });
 });
+
+describe('hasPreviousCommit', () => {
+  it('returns true if a commit is found', async () => {
+    command.mockImplementation(
+      () => Promise.resolve({ all: `19b6c9c5b3d34d9fc55627fcaf8a85bd5d5e5b2a` }) as any
+    );
+    expect(await hasPreviousCommit()).toEqual(true);
+  });
+
+  it('returns false if no commit is found', async () => {
+    command.mockImplementation(() => Promise.resolve({ all: `` }) as any);
+    expect(await hasPreviousCommit()).toEqual(false);
+  });
+
+  it('ignores gpg signature information', async () => {
+    command.mockImplementation(
+      () =>
+        Promise.resolve({
+          all: `
+gpg: Signature made Fri Oct  6 12:40:14 2023 CEST
+gpg:                using RSA key 4AEE18F83AFDEB23
+gpg: Can't check signature: No public key
+19b6c9c5b3d34d9fc55627fcaf8a85bd5d5e5b2a
+          `.trim(),
+        }) as any
+    );
+    expect(await hasPreviousCommit()).toEqual(true);
+  });
+});

node-src/git/git.ts

@@ -68,7 +68,12 @@ export async function getCommit(revision = '') {
     // Technically this yields the author info, not committer info
     `git --no-pager log -n 1 --format="%H ## %ct ## %ae ## %an" ${revision}`
   );
-  const [commit, committedAtSeconds, committerEmail, committerName] = result.split(' ## ');
+
+  // Ignore lines that don't match the expected format (e.g. gpg signature info)
+  const format = new RegExp('^[a-f0-9]+ ## ');
+  const data = result.split('\n').find((line: string) => format.test(line));
+
+  const [commit, committedAtSeconds, committerEmail, committerName] = data.split(' ## ');
   const committedAt = Number(committedAtSeconds) * 1000;
   return { commit, committedAt, committerEmail, committerName };
 }
@@ -119,7 +124,10 @@ export async function getUncommittedHash() {
 
 export async function hasPreviousCommit() {
   const result = await execGitCommand(`git --no-pager log -n 1 --skip=1 --format="%H"`);
-  return !!result.trim();
+
+  // Ignore lines that don't match the expected format (e.g. gpg signature info)
+  const allhex = new RegExp('^[a-f0-9]+$');
+  return result.split('\n').some((line: string) => allhex.test(line));
 }
 
 // Check if a commit exists in the repository