Handle git being entirely absent1.5.0

When we try to find the git directory, if git is not present, treat
that the same as an error from git itself. Sadly tests for this are
nearly impossible to meaningfully write, since we always have git
installed. I can do a mock based test if folk want one.

Change-Id: If6160d1fb3def8133bdd0b66105e60ef93f80f82
Closes-Bug: #1481468

1 files changed, 8 insertions, 1 deletions

diff --git a/pbr/git.py b/pbr/git.py
index b4ae300..60acd3c 100644
--- a/pbr/git.py
+++ b/pbr/git.py
@@ -18,6 +18,7 @@ from __future__ import unicode_literals
 
 import distutils.errors
 from distutils import log
+import errno
 import io
 import os
 import re
@@ -64,7 +65,13 @@ def _run_git_command(cmd, git_dir, **kwargs):
 
 
 def _get_git_directory():
-    return _run_shell_command(['git', 'rev-parse', '--git-dir'])
+    try:
+        return _run_shell_command(['git', 'rev-parse', '--git-dir'])
+    except OSError as e:
+        if e.errno == errno.ENOENT:
+            # git not installed.
+            return ''
+        raise
 
 
 def _git_is_installed():