experiments: commit with --no-verify in executors (#5078)

* git: add no_verify flag for commit()

* experiments: commit with --no-verify in executors

* git: wrap hook exceptions with SCMError

* update hook file perms

* update dulwich to 0.20.15

* update pygit2 commit def

* skip hook tests on windows

dvc/repo/experiments/executor/base.py

@@ -376,7 +376,7 @@ class BaseExecutor(ABC):
             logger.debug("Commit to new experiment branch '%s'", branch)
 
         scm.gitpython.repo.git.add(update=True)
-        scm.commit(f"dvc: commit experiment {exp_hash}")
+        scm.commit(f"dvc: commit experiment {exp_hash}", no_verify=True)
         new_rev = scm.get_rev()
         scm.set_ref(branch, new_rev, old_ref=old_ref)
         scm.set_ref(EXEC_BRANCH, branch, symbolic=True)

dvc/scm/git/backend/base.py

@@ -56,7 +56,7 @@ class BaseGitBackend(ABC):
         pass
 
     @abstractmethod
-    def commit(self, msg: str):
+    def commit(self, msg: str, no_verify: bool = False):
         pass
 
     @abstractmethod

dvc/scm/git/backend/dulwich.py

@@ -145,10 +145,14 @@ class DulwichBackend(BaseGitBackend):  # pylint:disable=abstract-method
             # NOTE: this doesn't check gitignore, same as GitPythonBackend.add
             self.repo.stage(relpath(fpath, self.root_dir))
 
-    def commit(self, msg: str):
+    def commit(self, msg: str, no_verify: bool = False):
+        from dulwich.errors import CommitError
         from dulwich.porcelain import commit
 
-        commit(self.root_dir, message=msg)
+        try:
+            commit(self.root_dir, message=msg, no_verify=no_verify)
+        except CommitError as exc:
+            raise SCMError("Git commit failed") from exc
 
     def checkout(
         self, branch: str, create_new: Optional[bool] = False, **kwargs,

dvc/scm/git/backend/gitpython.py

@@ -200,8 +200,13 @@ class GitPythonBackend(BaseGitBackend):  # pylint:disable=abstract-method
 
             logger.exception(msg)
 
-    def commit(self, msg: str):
-        self.repo.index.commit(msg)
+    def commit(self, msg: str, no_verify: bool = False):
+        from git.exc import HookExecutionError
+
+        try:
+            self.repo.index.commit(msg, skip_hooks=no_verify)
+        except HookExecutionError as exc:
+            raise SCMError("Git pre-commit hook failed") from exc
 
     def checkout(
         self, branch: str, create_new: Optional[bool] = False, **kwargs

dvc/scm/git/backend/pygit2.py

@@ -86,7 +86,7 @@ class Pygit2Backend(BaseGitBackend):  # pylint:disable=abstract-method
     def add(self, paths: Iterable[str]):
         raise NotImplementedError
 
-    def commit(self, msg: str):
+    def commit(self, msg: str, no_verify: bool = False):
         raise NotImplementedError
 
     def checkout(

setup.py

@@ -50,7 +50,7 @@ install_requires = [
     "colorama>=0.3.9",
     "configobj>=5.0.6",
     "gitpython>3",
-    "dulwich>=0.20.14",
+    "dulwich>=0.20.15",
     "pygit2>=1.4.0",
     "setuptools>=34.0.0",
     "nanotime>=0.5.2",

tests/unit/scm/test_git.py

@@ -301,3 +301,23 @@ def test_ignore_remove_empty(tmp_dir, scm, git):
 
     git.ignore_remove(test_entries[1]["path"])
     assert not path_to_gitignore.exists()
+
+
+@pytest.mark.skipif(
+    os.name == "nt", reason="Git hooks not supported on Windows"
+)
+@pytest.mark.parametrize("hook", ["pre-commit", "commit-msg"])
+def test_commit_no_verify(tmp_dir, scm, git, hook):
+    import stat
+
+    hook_file = os.path.join(".git", "hooks", hook)
+    tmp_dir.gen(
+        hook_file, "#!/usr/bin/env python\nimport sys\nsys.exit(1)",
+    )
+    os.chmod(hook_file, stat.S_IREAD | stat.S_IWRITE | stat.S_IEXEC)
+
+    tmp_dir.gen("foo", "foo")
+    git.add(["foo"])
+    with pytest.raises(SCMError):
+        git.commit("commit foo")
+    git.commit("commit foo", no_verify=True)