dogtail-devel New distro-specific hooks.

[Dave Malcolm <dmalcolm redhat com>]

I've committed the attached patch to HEAD which adds two new methods to
PackageDb, and implemented them for the RPM backend.  They'll need
implementing at some point by the other backends (Apt etc)...

Dave

Index: dogtail/distro.py
===================================================================
RCS file: /cvs/gnome/dogtail/dogtail/distro.py,v
retrieving revision 1.4
diff -u -p -r1.4 distro.py
--- dogtail/distro.py	7 Oct 2005 23:41:09 -0000	1.4
+++ dogtail/distro.py	28 Oct 2005 06:04:31 -0000
@@ -18,7 +18,22 @@ class PackageDb:
 		Method to get the version of an installed package as a Version instance (or raise an exception if not found)
 		Note: does not know about distributions' internal revision numbers.
 		"""
-		raise NotImplemented
+		raise NotImplementedError
+
+	def getFiles(self, packageName):
+		"""
+		Method to get a list of filenames owned by the package, or 
+		raise an exception if not found.
+		"""
+		raise NotImplementedError
+
+	def getDependencies(self, packageName):
+		"""
+		Method to get a list of unique package names that this package 
+		is dependent on, or raise an exception if the package is not 
+		found.
+		"""
+		raise NotImplementedError
 
 class Distro:
 	"""
@@ -56,7 +71,9 @@ class Conary(Distro):
 
 def __makeRpmPackageDb():
 	"""
-	Manufacture a PackageDb for an RPM system.  We hide this inside a factory method so that we only import the RPM Python bindings if we're on a platform likely to have them
+	Manufacture a PackageDb for an RPM system.  We hide this inside a 
+	factory method so that we only import the RPM Python bindings if we're
+	on a platform likely to have them
 	"""
 	class RpmPackageDb(PackageDb):
 		def getVersion(self, packageName):
@@ -65,9 +82,40 @@ def __makeRpmPackageDb():
 			for header in ts.dbMatch("name", packageName):
 				return Version.fromString(header["version"])
 			raise "Package not found: %s"%packageName
+
+		def getFiles(self, packageName):
+			import rpm
+			ts = rpm.TransactionSet()
+			for header in ts.dbMatch("name", packageName):
+				return header["filenames"]
+			raise "Package not found: %s"%packageName
+	
+		def getDependencies(self, packageName):
+			import rpm
+			ts = rpm.TransactionSet()
+			for header in ts.dbMatch("name", packageName):
+				# Simulate a set using a hash (to a dummy value);
+				# sets were only added in Python 2.4
+				result = {}
+
+				# Get the list of requirements; these are 
+				# sometimes package names, but can also be
+				# so-names of libraries, and invented virtual 
+				# ids
+				for requirement in header[rpm.RPMTAG_REQUIRES]:
+					# Get the name of the package providing
+					# this requirement:
+					for depPackageHeader in ts.dbMatch("provides", requirement):
+						depName = depPackageHeader['name']
+						if depName!=packageName:
+							# Add to the Hash with a dummy value
+							result[depName]=None
+				return result.keys()
+			raise "Package not found: %s"%packageName
+
 	return RpmPackageDb()
 
-PATCH_MESSAGE = "Please send patches to the mailing list." # FIXME: add mailing list address
+PATCH_MESSAGE = "Please send patches to dogtail-devel-list gnome org"
 
 def __makeAptPackageDb():
 	"""