[PATCH] fetch2/git: Simplify the validation of SHA-1 revisions

[Peter Kjellerstedt <pkj@axis.com>]

Also correct two comments.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
---
 bitbake/lib/bb/fetch2/git.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/bitbake/lib/bb/fetch2/git.py b/bitbake/lib/bb/fetch2/git.py
index b3eb8248d0..90104ac383 100644
--- a/bitbake/lib/bb/fetch2/git.py
+++ b/bitbake/lib/bb/fetch2/git.py
@@ -248,9 +248,10 @@ class Git(FetchMethod):
 
         ud.setup_revisions(d)
 
+        sha1_re = re.compile(r'^[0-9a-f]{40}$')
         for name in ud.names:
-            # Ensure anything that doesn't look like a sha256 checksum/revision is translated into one
-            if not ud.revisions[name] or len(ud.revisions[name]) != 40  or (False in [c in "abcdef0123456789" for c in ud.revisions[name]]):
+            # Ensure any revision that doesn't look like a SHA-1 is translated into one
+            if not sha1_re.match(ud.revisions[name] or ''):
                 if ud.revisions[name]:
                     ud.unresolvedrev[name] = ud.revisions[name]
                 ud.revisions[name] = self.latest_revision(ud, d, name)
@@ -259,10 +260,10 @@ class Git(FetchMethod):
         if gitsrcname.startswith('.'):
             gitsrcname = gitsrcname[1:]
 
-        # for rebaseable git repo, it is necessary to keep mirror tar ball
-        # per revision, so that even the revision disappears from the
+        # For a rebaseable git repo, it is necessary to keep a mirror tar ball
+        # per revision, so that even if the revision disappears from the
         # upstream repo in the future, the mirror will remain intact and still
-        # contains the revision
+        # contain the revision
         if ud.rebaseable:
             for name in ud.names:
                 gitsrcname = gitsrcname + '_' + ud.revisions[name]