Refactor git version detection for reuse
This way we can use it to detect feature support in the underlying
git, such as new options or commands that have been added in more
recent versions.
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/git_command.py b/git_command.py
index 7ff1aba..d56ad0a 100644
--- a/git_command.py
+++ b/git_command.py
@@ -68,6 +68,30 @@
return fun
git = _GitCall()
+_git_version = None
+
+def git_require(min_version, fail=False):
+ global _git_version
+
+ if _git_version is None:
+ ver_str = git.version()
+ if ver_str.startswith('git version '):
+ _git_version = tuple(
+ map(lambda x: int(x),
+ ver_str[len('git version '):].strip().split('.')[0:3]
+ ))
+ else:
+ print >>sys.stderr, 'fatal: "%s" unsupported' % ver_str
+ sys.exit(1)
+
+ if min_version <= _git_version:
+ return True
+ if fail:
+ need = '.'.join(map(lambda x: str(x), min_version))
+ print >>sys.stderr, 'fatal: git %s or later required' % need
+ sys.exit(1)
+ return False
+
class GitCommand(object):
def __init__(self,
project,