Don't treat unset init.templateDir as the current directory

pre_commit/commands/init_templatedir.py

@@ -2,6 +2,7 @@ import logging
 import os.path
 
 from pre_commit.commands.install_uninstall import install
+from pre_commit.util import CalledProcessError
 from pre_commit.util import cmd_output
 
 logger = logging.getLogger('pre_commit')
@@ -12,9 +13,14 @@ def init_templatedir(config_file, store, directory, hook_type):
         config_file, store, overwrite=True, hook_type=hook_type,
         skip_on_missing_config=True, git_dir=directory,
     )
-    _, out, _ = cmd_output('git', 'config', 'init.templateDir', retcode=None)
+    try:
+        _, out, _ = cmd_output('git', 'config', 'init.templateDir')
+    except CalledProcessError:
+        configured_path = None
+    else:
+        configured_path = os.path.realpath(out.strip())
     dest = os.path.realpath(directory)
-    if os.path.realpath(out.strip()) != dest:
+    if configured_path != dest:
         logger.warning('`init.templateDir` not set to the target directory')
         logger.warning(
             'maybe `git config --global init.templateDir {}`?'.format(dest),

tests/commands/init_templatedir_test.py

@@ -47,3 +47,17 @@ def test_init_templatedir_already_set(tmpdir, tempdir_factory, store, cap_out):
     lines = cap_out.get().splitlines()
     assert len(lines) == 1
     assert lines[0].startswith('pre-commit installed at')
+
+
+def test_init_templatedir_not_set(tmpdir, store, cap_out):
+    # set HOME to ignore the current `.gitconfig`
+    with envcontext([('HOME', str(tmpdir))]):
+        with tmpdir.join('tmpl').ensure_dir().as_cwd():
+            # we have not set init.templateDir so this should produce a warning
+            init_templatedir(C.CONFIG_FILE, store, '.', hook_type='pre-commit')
+
+    lines = cap_out.get().splitlines()
+    assert len(lines) == 3
+    assert lines[1] == (
+        '[WARNING] `init.templateDir` not set to the target directory'
+    )