From 28f8e387b8e5bf6ffcc0ca340bfc8717d5ffc9d5 Mon Sep 17 00:00:00 2001
From: Sam Thursfield <sam.thursfield@codethink.co.uk>
Date: Tue, 2 Oct 2012 11:21:53 +0100
Subject: Extract is_valid_sha1() to morphlib.git

---
 morphlib/git.py | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'morphlib/git.py')

diff --git a/morphlib/git.py b/morphlib/git.py
index 5862ef9b..27f22351 100644
--- a/morphlib/git.py
+++ b/morphlib/git.py
@@ -225,3 +225,9 @@ def find_first_ref(runcmd, gitdir, ref):
     '''Find the *first* ref match and returns its sha1.'''
     return runcmd(['git', 'show-ref', ref],
                   cwd=gitdir).split("\n")[0].split(" ")[0]
+
+def is_valid_sha1(ref):
+    '''Checks whether a string is a valid SHA1.'''
+
+    valid_chars = 'abcdefABCDEF0123456789'
+    return len(ref) == 40 and all([x in valid_chars for x in ref])
-- 
cgit v1.2.1