pristine-tar: add feature detection

so we can run tests with older pristine-tar not supporting verify

2 files changed, 22 insertions, 1 deletions

diff --git a/gbp/pkg/pristinetar.py b/gbp/pkg/pristinetar.py
index 4b7a87ee..cd7c5123 100644
--- a/gbp/pkg/pristinetar.py
+++ b/gbp/pkg/pristinetar.py
@@ -16,6 +16,7 @@
 #    <http://www.gnu.org/licenses/>
 """Handle checkin and checkout of archives from the pristine-tar branch"""
 
+import re
 import os
 import gbp.log
 from gbp.command_wrappers import Command
@@ -30,6 +31,25 @@ class PristineTar(Command):
         self.repo = repo
         super(PristineTar, self).__init__(self.cmd, cwd=repo.path, capture_stderr=True)
 
+    def _has_feature(self, feature):
+        """
+        Check if pristine_tar has a certain feature enabled.
+
+        @param feature: feature / command option to check
+        @type feature: C{str}
+        @return: True if feature is supported
+        @rtype: C{bool}
+        """
+        self.call(['--help'], quiet=True)  # There's no --help so we always exit 1
+        r = re.compile('.* pristine-tar .* %s' % feature)
+        for line in self.stderr.splitlines():
+            if r.match(line):
+                return True
+        return False
+
+    def has_feature_verify(self):
+        return self._has_feature("verify")
+
     def has_commit(self, archive_regexp):
         """
         Do we have a pristine-tar commit for a package matching I{archive_regexp}.
diff --git a/tests/doctests/test_PristineTar.py b/tests/doctests/test_PristineTar.py
index 95472877..dffb4491 100644
--- a/tests/doctests/test_PristineTar.py
+++ b/tests/doctests/test_PristineTar.py
@@ -146,7 +146,8 @@ def test_pristine_tar_verify():
 
     >>> import gbp.deb.git
     >>> repo = gbp.deb.git.DebianGitRepository(dirs['repo'])
-    >>> repo.pristine_tar.verify('../upstream_1.0.orig.tar.gz')
+    >>> if repo.pristine_tar.has_feature_verify():
+    ...    repo.pristine_tar.verify('../upstream_1.0.orig.tar.gz')
     """