--- repoman.old	2010-12-04 11:15:35.000000000 +0100
+++ repoman	2010-12-04 11:50:56.000000000 +0100
@@ -333,6 +333,7 @@
 	"REQUIRED_USE.syntax":"Syntax error in REQUIRED_USE (usually an extra/missing space/parenthesis)",
 	"SRC_URI.syntax":"Syntax error in SRC_URI (usually an extra/missing space/parenthesis)",
 	"SRC_URI.mirror":"A uri listed in profiles/thirdpartymirrors is found in SRC_URI",
+	"SRC_URI.compression":"A tarball listed in SRC_URI requires decompression tool not found in DEPEND.",
 	"ebuild.syntax":"Error generating cache entry for ebuild; typically caused by ebuild syntax error or digest verification failure",
 	"ebuild.output":"A simple sourcing of the ebuild produces output; this breaks ebuild policy.",
 	"ebuild.nesteddie":"Placing 'die' inside ( ) prints an error, but doesn't stop the ebuild.",
@@ -1032,6 +1033,20 @@
 for v in repoman_settings.thirdpartymirrors().values():
 	thirdpartymirrors.extend(v)
 
+# Build list of compressions and their packages
+compression_algs = {}
+compression_algs['rar'] = [ '.rar' ]
+compression_algs['zip'] = [ '.zip' ]
+compression_algs['7zip'] = [ '.7z' ]
+compression_algs['lzma'] = [ '.xz', '.lzma' ]
+compression_algs['bzip'] = [ '.bz2', '.tbz2' ]
+compression_pkgs = {}
+compression_pkgs['rar'] = [ 'app-arch/unrar', 'app-arch/rar' ]
+compression_pkgs['zip'] = [ 'app-arch/unzip', 'app-arch/zip' ]
+compression_pkgs['7zip'] = [ 'app-arch/p7zip' ]
+compression_pkgs['lzma'] = [ 'app-arch/xz-utils' ]
+compression_pkgs['bzip'] = [ 'app-arch/bzip2' ]
+
 class _MetadataTreeBuilder(xml.etree.ElementTree.TreeBuilder):
 	"""
 	Implements doctype() as required to avoid deprecation warnings with
@@ -1512,6 +1527,44 @@
 					"%s: '%s' found in thirdpartymirrors" % \
 					(relative_path, mirror))
 
+			# Check that URIs don't contain tarball with non-availible compression algorithm
+			# files we are fetching
+			distdata = portdb.getFetchMap(pkg.cpv)
+			mylist = list(distdata)
+			# depend for the package
+			mydepstr = myaux['DEPEND']
+			try:
+				atoms = portage.dep.use_reduce(mydepstr, matchall=1, flat=True, \
+					is_valid_flag=pkg.iuse.is_valid_flag, token_class=portage.dep.Atom)
+			except portage.exception.InvalidDependString as e:
+				atoms = None
+				badsyntax.append(str(e))
+			checkalgs=[]
+			for filename in mylist:
+				# find all depends we find suspicious
+				for alg in compression_algs:
+					for suffix in compression_algs[alg]:
+						if filename.endswith(suffix) and alg not in checkalgs:
+							checkalgs.append(alg)
+			for alg in checkalgs:
+				# check compressions with depend
+				for atom in atoms:
+					if atom == "||":
+						continue
+					if atom.blocker:
+						continue
+					for comppkg in compression_pkgs[alg]:
+						if atom.cp == comppkg:
+							checkalgs.remove(alg)
+							break
+					if alg not in checkalgs:
+						break
+			for alg in checkalgs:
+				# here we already know what failed so just print it out
+				stats['SRC_URI.compression'] += 1
+				fails['SRC_URI.compression'].append('%s: %s decompression algorithm required. Add %s to DEPEND.' % \
+					(relative_path, alg, compression_pkgs[alg]))
+
 		try:
 			provide = portage.dep.use_reduce(pkg.metadata['PROVIDE'],
 				token_class=portage.dep.Atom, matchall=1, flat=True)