Expose a 'rpm_version' extra command

Intended usage, getting a rpm *compatible* version number from pbr
from a pbr using python package. Typically this will then get
put into a rpm spec file (what is used to build an rpm) and used to
build an rpm using `rpmbuild` (the thing used to translate rpm spec
files into rpms).

For example: this allows [1][2] (which I am the primary maintainer of
and godaddy, cray, and y! are users of) to get out of the whacky
and/or flakey rpm version number calculation/conversion process (which
previously just worked around by saying only use tags).

[1] https://github.com/stackforge/anvil
[2] https://anvil.readthedocs.org/en/latest/topics/summary.html

Change-Id: I26cd1d6e8aef69d52e8a4f36bd264c690e712ba3

1 files changed, 8 insertions, 0 deletions

diff --git a/pbr/tests/test_commands.py b/pbr/tests/test_commands.py
index c73a9f3..74f50df 100644
--- a/pbr/tests/test_commands.py
+++ b/pbr/tests/test_commands.py
@@ -56,3 +56,11 @@ class TestCommands(base.BaseTestCase):
         self.addDetail('stderr', content.text_content(stderr))
         self.assertIn('Running custom build_py command.', stdout)
         self.assertEqual(return_code, 0)
+
+    def test_custom_rpm_version_py_command(self):
+        """Test custom rpm_version command."""
+        stdout, stderr, return_code = self.run_setup('rpm_version')
+        self.addDetail('stdout', content.text_content(stdout))
+        self.addDetail('stderr', content.text_content(stderr))
+        self.assertIn('Extracting rpm version', stdout)
+        self.assertEqual(return_code, 0)