From 8e9d8306017174a5422c657ebf651c796d5c3d8c Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Mon, 31 Jul 2006 18:10:19 +0000
Subject: Fix depclean so that it cleans unneeded slots (unless they are
 exempted by the system or world sets).  See bug #140591.  This patch is from
 trunk r3913:3915.

svn path=/main/branches/2.1/; revision=4066
---
 bin/emerge | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

(limited to 'bin/emerge')

diff --git a/bin/emerge b/bin/emerge
index eafc07810..1b5de9765 100755
--- a/bin/emerge
+++ b/bin/emerge
@@ -22,6 +22,9 @@ import portage_locks
 import portage_exception
 from portage_const import PROFILE_PATH
 
+if not hasattr(__builtins__, "set"):
+	from sets import Set as set
+
 portage.global_updates(
 	portage.settings, portage.db, portage.mtimedb["updates"])
 
@@ -3275,9 +3278,10 @@ elif "depclean"==myaction:
 	print red("*** WARNING ***")
 	print red("*** WARNING ***")+"  "+bold("Make sure you have a backup.")
 
+	vartree = portage.db[portage.settings["ROOT"]]["vartree"]
 	syslist=getlist("system")
 	worldlist=getlist("world")
-	myvarlist=portage.vardbapi(portage.root).cp_all()
+	myvarlist = vartree.dbapi.cpv_all()
 
 	if not syslist:
 		print "\n!!! You have no system list.",
@@ -3317,6 +3321,7 @@ elif "depclean"==myaction:
 		sys.exit(1)
 
 	reallist=[]
+	explicitly_required = set()
 	for x in alldeps:
 		myparts=portage.catpkgsplit(string.split(x)[2])
 		if not myparts:
@@ -3332,31 +3337,23 @@ elif "depclean"==myaction:
 		catpack=myparts[0]+"/"+myparts[1]
 		if catpack not in reallist:
 			reallist.append(catpack)
+		explicitly_required.add(x.split()[2])
+
+	
+	sys_world_unversioned = set()
+	from itertools import chain
+	for x in chain(syslist, worldlist):
+		sys_world_unversioned.add(portage.dep_getkey(x))
 
 	cleanlist=[]
 	for x in myvarlist:
-		if x not in reallist:
-			if x not in cleanlist:
+		if x not in explicitly_required:
+			# We have to exempt all slots from the system and world sets since
+			# there's currently no way of knowing which slots the user may want
+			# to keep.
+			if portage.dep_getkey(x) not in sys_world_unversioned:
 				cleanlist.append(x)
 
-	for x in syslist+worldlist:
-		myparts = portage.catpkgsplit(x)
-		if myparts:
-			if myparts[0][0] in ('<','>','='):
-				myparts[0] = myparts[0][1:]
-			if myparts[0][0] in ('<','>','='):
-				myparts[0] = myparts[0][1:]
-			catpack=myparts[0]+"/"+myparts[1]
-		else:
-			catpack=x
-		if catpack in cleanlist:
-			cleanlist.remove(catpack)
-
-	#print "\n\n\nCleaning: "
-	#for x in cleanlist:
-	#	print x
-	#print
-
 	if len(cleanlist):
 		unmerge("unmerge", cleanlist)
 
-- 
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