lib/bpgit.py: add git tree verification support

This verifies that the tree provided has its last commit
both tagged and also digitally signed. In short it does:

  git tag -v $(git describe --dirty)

This will be used later.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/bpgit.py b/lib/bpgit.py
index f4af314a..02f6d8a7 100644
--- a/lib/bpgit.py
+++ b/lib/bpgit.py
@@ -107,6 +107,18 @@ def describe(rev='HEAD', tree=None, extra_args=[]):
 
     return stdout.strip()
 
+def verify(git_tree):
+    tag = describe(rev=None, tree=git_tree, extra_args=['--dirty'])
+    cmd = ['git', 'tag', '-v', tag]
+
+    process = subprocess.Popen(cmd,
+                               stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
+                               close_fds=True, universal_newlines=True, cwd=git_tree)
+    stdout = process.communicate()[0]
+    process.wait()
+
+    return dict(r=process.returncode, output=stdout)
+
 def init(tree=None):
     process = subprocess.Popen(['git', 'init'],
                                stdout=subprocess.PIPE, stderr=subprocess.STDOUT,