[gentoo-commits] proj/pms-test-suite:master commit in: PMSTestSuite/pm/

["Michał Górny" <mgorny@gentoo.org>]

commit:     1a379e673441e5f4b9e6a7c6fe133fdbda59ae01
Author:     Michał Górny <mgorny <AT> gentoo <DOT> org>
AuthorDate: Wed May 25 16:24:37 2011 +0000
Commit:     Michał Górny <mgorny <AT> gentoo <DOT> org>
CommitDate: Wed May 25 16:24:37 2011 +0000
URL:        http://git.overlays.gentoo.org/gitweb/?p=proj/pms-test-suite.git;a=commit;h=1a379e67

Distinguish between installed and non-installed PMs.

---
 PMSTestSuite/pm/__init__.py |   22 ++++++++++++++++++----
 PMSTestSuite/pm/portage.py  |    6 ++++++
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/PMSTestSuite/pm/__init__.py b/PMSTestSuite/pm/__init__.py
index 9980659..27df2fa 100644
--- a/PMSTestSuite/pm/__init__.py
+++ b/PMSTestSuite/pm/__init__.py
@@ -4,8 +4,10 @@
 
 """
 >>> pms = get_package_managers()
->>> 'portage' in [str(x) for x in pms]
+>>> 'portage' in [x.name for x in pms]
 True
+>>> str(pms[0]) # doctest: +ELLIPSIS
+'...'
 """
 
 class PackageManager(object):
@@ -28,8 +30,13 @@ class PackageManager(object):
 		raise NotImplementedError('Please override the pkg property.')
 
 	@classmethod
-	def is_available(self):
-		pass
+	def is_available(cls):
+		"""
+		Check whether a particular PM is installed and executable.
+
+		Returns True if the PM is available, False otherwise.
+		"""
+		raise NotImplementedError('Please override the is_available class method.')
 
 def get_package_managers():
 	""" Return the list of supported Package Managers. """
@@ -42,8 +49,15 @@ def get_package_managers():
 			""" Instantiate the wrapper for PM class <pmclass>. """
 			self._pmclass = pmclass
 
+		@property
+		def name(self):
+			""" The name of associated PM. """
+			return self._pmclass.name
+
 		def __str__(self):
-			""" Return the name of associated PM. """
+			""" Return the human-readable name of associated PM. """
+			if not self._pmclass.is_available():
+				return '(%s)' % self._pmclass.name
 			return self._pmclass.name
 
 	return [PMWrapper(x) for x in (PortagePM,)]

diff --git a/PMSTestSuite/pm/portage.py b/PMSTestSuite/pm/portage.py
index 5c8abd8..7a21593 100644
--- a/PMSTestSuite/pm/portage.py
+++ b/PMSTestSuite/pm/portage.py
@@ -2,9 +2,15 @@
 # (c) 2011 Michał Górny <mgorny@gentoo.org>
 # Released under the terms of the 2-clause BSD license.
 
+import os
+
 from PMSTestSuite.pm import PackageManager
 
 class PortagePM(PackageManager):
 	""" A class implementing the interfaces to the Portage PM. """
 	name = 'portage'
 	pkg = 'sys-apps/portage'
+
+	@classmethod
+	def is_available(cls):
+		return os.access('/usr/bin/emerge', os.X_OK)