Parse bad config values

lib/errors.ts

@@ -1,5 +1,6 @@
 /** The git errors which can be parsed from failed git commands. */
 export enum GitError {
+  BadConfigValue,
   SSHKeyAuditUnverified,
   SSHAuthenticationFailed,
   SSHPermissionDenied,
@@ -64,6 +65,8 @@ export enum GitError {
 
 /** A mapping from regexes to the git error they identify. */
 export const GitErrorRegexes: { [regexp: string]: GitError } = {
+  "fatal: bad (?:numeric|boolean) config value '(.+)' for '(.+)'":
+    GitError.BadConfigValue,
   'ERROR: ([\\s\\S]+?)\\n+\\[EPOLICYKEYAGE\\]\\n+fatal: Could not read from remote repository.':
     GitError.SSHKeyAuditUnverified,
   "fatal: Authentication failed for 'https://":

test/fast/errors-test.ts

@@ -65,4 +65,61 @@ describe('detects errors', () => {
     // toContain because of realpath and we don't care about /private/ on macOS
     expect(m![1]).toContain(repoName)
   })
+  describe('BadConfigValue', () => {
+    it('detects bad boolean config value', async () => {
+      const repoPath = await initialize('bad-config-repo')
+
+      const filePath = 'text.md'
+      writeFileSync(join(repoPath, filePath), 'some text')
+      await GitProcess.exec(['add', filePath], repoPath)
+
+      await GitProcess.exec(['config', 'core.autocrlf', 'nab'], repoPath)
+
+      const result = await GitProcess.exec(
+        ['commit', '-m', 'add a text file'],
+        repoPath
+      )
+
+      expect(result).toHaveGitError(GitError.BadConfigValue)
+
+      const errorEntry = Object.entries(GitErrorRegexes).find(
+        ([_, v]) => v === GitError.BadConfigValue
+      )
+
+      expect(errorEntry).not.toBe(null)
+      const m = result.stderr.match(errorEntry![0])
+
+      expect(m![1]).toBe('nab')
+      expect(m![2]).toBe('core.autocrlf')
+    })
+    it('detects bad numeric config value', async () => {
+      const repoPath = await initialize('bad-config-repo')
+
+      const filePath = 'text.md'
+      writeFileSync(join(repoPath, filePath), 'some text')
+      await GitProcess.exec(['add', filePath], repoPath)
+
+      await GitProcess.exec(
+        ['config', 'core.repositoryformatversion', 'nan'],
+        repoPath
+      )
+
+      const result = await GitProcess.exec(
+        ['commit', '-m', 'add a text file'],
+        repoPath
+      )
+
+      expect(result).toHaveGitError(GitError.BadConfigValue)
+
+      const errorEntry = Object.entries(GitErrorRegexes).find(
+        ([_, v]) => v === GitError.BadConfigValue
+      )
+
+      expect(errorEntry).not.toBe(null)
+      const m = result.stderr.match(errorEntry![0])
+
+      expect(m![1]).toBe('nan')
+      expect(m![2]).toBe('core.repositoryformatversion')
+    })
+  })
 })