Insure git hooks are ignored on checkout during conflicts

copier/_main.py

@@ -1335,7 +1335,15 @@ def _apply_update(self) -> None:  # noqa: C901
                         # Remove ".rej" suffix
                         fname = fname[:-4]
                         # Undo possible non-rejected chunks
-                        git("checkout", "--", fname)
+                        git(
+                            # Ignore hooks to avoid errors from them or
+                            # issues when .pre-commit-config.yaml is changed
+                            "-c",
+                            "core.hooksPath=/dev/null",
+                            "checkout",
+                            "--",
+                            fname,
+                        )
                         # 3-way-merge the file directly
                         git(
                             "merge-file",

tests/test_updatediff.py

@@ -321,7 +321,7 @@ def test_commit_hooks_respected(tmp_path_factory: pytest.TempPathFactory) -> Non
                     _templates_suffix: {SUFFIX_TMPL}
                     _tasks:
                         - git init
-                        - pre-commit install -t pre-commit -t commit-msg
+                        - pre-commit install
                         - pre-commit run -a || true
                     what: grog
                     """
@@ -333,6 +333,10 @@ def test_commit_hooks_respected(tmp_path_factory: pytest.TempPathFactory) -> Non
                 ),
                 ".pre-commit-config.yaml": (
                     r"""
+                    default_install_hook_types: [
+                        pre-commit,
+                        commit-msg,
+                    ]
                     repos:
                     -   repo: https://github.com/pre-commit/mirrors-prettier
                         rev: v2.0.4
@@ -480,6 +484,131 @@ def test_commit_hooks_respected(tmp_path_factory: pytest.TempPathFactory) -> Non
         assert Path(f"{life}.rej").is_file()
 
 
+# Checkout test_commit_hooks_respected
+# FIXME Some generous Windows power user please fix this test!
+@pytest.mark.xfail(
+    condition=platform.system() == "Windows", reason="Git broken on Windows?"
+)
+@pytest.mark.impure
+def test_post_checkout_hook_ignored(tmp_path_factory: pytest.TempPathFactory) -> None:
+    """Ignore post-checkout hook when conflicts are encountered and .pre-commit-config.yaml is updated."""
+    # Prepare source template v1
+    src, dst1 = map(tmp_path_factory.mktemp, ("src", "dst1"))
+    with local.cwd(src):
+        build_file_tree(
+            {
+                "copier.yml": (
+                    f"""
+                    _envops: {BRACKET_ENVOPS_JSON}
+                    _templates_suffix: {SUFFIX_TMPL}
+                    _tasks:
+                        - git init
+                        - pre-commit install
+                        - pre-commit run -a || true
+                    """
+                ),
+                "[[ _copier_conf.answers_file ]].tmpl": (
+                    """
+                    [[ _copier_answers|to_nice_yaml ]]
+                    """
+                ),
+                "test.txt": "This is a file",
+                ".pre-commit-config.yaml": (
+                    r"""
+                    default_install_hook_types: [
+                        pre-commit,
+                        pre-push,
+                        post-checkout,
+                        post-merge,
+                        post-rewrite,
+                    ]
+                    repos:
+                    -   repo: local
+                        hooks:
+                        -   id: echo
+                            name: echo V1
+                            entry: exit 0
+                            language: system
+                            pass_filenames: false
+                            types: [ file ]
+                            stages: [
+                                post-checkout,
+                                post-merge,
+                                post-rewrite,
+                            ]
+                    """
+                ),
+            }
+        )
+        git("init")
+        git("add", ".")
+        git("commit", "-m", "feat: commit 1")
+        git("tag", "v1")
+    # Copy source template
+    run_copy(
+        src_path=str(src),
+        dst_path=dst1,
+        defaults=True,
+        overwrite=False,
+        unsafe=True,
+    )
+    with local.cwd(dst1):
+        git("add", ".")
+        # Commit initial copy
+        git("commit", "-am", "feat: copied v1")
+        # Introduce conflict
+        Path(f"{dst1}/test.txt").open(mode="w").write("This is a conflicting change")
+        git("add", ".")
+        git("commit", "-am", "feat: edit test.txt")
+    # Evolve source template to v2
+    with local.cwd(src):
+        build_file_tree(
+            {
+                ".pre-commit-config.yaml": (
+                    r"""
+                    default_install_hook_types: [
+                        pre-commit,
+                        pre-push,
+                        post-checkout,
+                        post-merge,
+                        post-rewrite,
+                    ]
+                    repos:
+                    -   repo: local
+                        hooks:
+                        -   id: echo
+                            name: echo V2
+                            entry: exit 0
+                            language: system
+                            pass_filenames: false
+                            types: [ file ]
+                            stages: [
+                                post-checkout,
+                                post-merge,
+                                post-rewrite,
+                            ]
+                    """
+                ),
+                "test.txt": "This is a edited file in v2",
+            }
+        )
+        git("init")
+        git("add", ".")
+        git("commit", "-m", "feat: update .pre-commit-config.yaml")
+        git("tag", "v2")
+    # Update subproject to v2
+    # No errors should be raised due to post-checkout hook when
+    # encountering conflicts and .pre-commit-config.yaml is updated
+    run_update(
+        dst_path=dst1,
+        defaults=True,
+        overwrite=True,
+        unsafe=True,
+        skip_tasks=True,
+        conflict="inline",
+    )
+
+
 def test_update_from_tagged_to_head(tmp_path_factory: pytest.TempPathFactory) -> None:
     src, dst = map(tmp_path_factory.mktemp, ("src", "dst"))
     # Build a template