This patch adds support for a new option to emerge "--fetch-missing" which will result in just the missing files
being printed as urls should the pretend option be combined with a fetch option.

--- /usr/lib/portage/pym/portage.py.orig	2005-07-27 00:07:00.000000000 +0100
+++ /usr/lib/portage/pym/portage.py	2005-10-14 22:55:02.000000000 +0100
@@ -1604,7 +1604,7 @@
 
 
 
-def fetch(myuris, mysettings, listonly=0, fetchonly=0, locks_in_subdir=".locks",use_locks=1, try_mirrors=1):
+def fetch(myuris, mysettings, listonly=0, fetchonly=0, locks_in_subdir=".locks",use_locks=1, try_mirrors=1, fetchmissing=0):
 	"fetch files.  Will use digest file if available."
 
 	# 'nomirror' is bad/negative logic. You Restrict mirroring, not no-mirroring.
@@ -1821,7 +1821,7 @@
 					file_lock = portage_locks.lockfile(mysettings["DISTDIR"]+"/"+myfile,wantnewlockfile=1)
 		try:
 			for loc in filedict[myfile]:
-				if listonly:
+				if listonly and not fetchmissing:
 					writemsg(loc+" ")
 					continue
 				# allow different fetchcommands per protocol
@@ -1868,6 +1868,11 @@
 					writemsg("An exception was caught(1)...\nFailing the download: %s.\n" % (str(e)),1)
 					fetched=0
 
+				if listonly:
+					if fetched == 0:
+						writemsg(loc+" ")
+					continue
+
 				if not can_fetch:
 					if fetched != 2:
 						if fetched == 0:
@@ -2320,7 +2325,7 @@
 				droppriv=actionmap[mydo]["args"][1],logfile=logfile)
 	return retval
 
-def doebuild(myebuild,mydo,myroot,mysettings,debug=0,listonly=0,fetchonly=0,cleanup=0,dbkey=None,use_cache=1,fetchall=0,tree="porttree"):
+def doebuild(myebuild,mydo,myroot,mysettings,debug=0,listonly=0,fetchonly=0,cleanup=0,dbkey=None,use_cache=1,fetchall=0,tree="porttree",fetchmissing=0):
 	global db
 
 	ebuild_path = os.path.abspath(myebuild)
@@ -2661,7 +2666,7 @@
 	except:
 		pass
 
-	if mydo!="manifest" and not fetch(fetchme, mysettings, listonly=listonly, fetchonly=fetchonly):
+	if mydo!="manifest" and not fetch(fetchme, mysettings, listonly=listonly, fetchonly=fetchonly, fetchmissing=fetchmissing):
 		return 1
 
 	if mydo=="fetch" and listonly:
--- /usr/lib/portage/bin/emerge.orig	2005-10-14 22:56:02.000000000 +0100
+++ /usr/lib/portage/bin/emerge	2005-10-14 22:57:17.000000000 +0100
@@ -174,6 +174,7 @@
 "--digest",
 "--emptytree",
 "--fetchonly",    "--fetch-all-uri",
+"--fetch-missing",
 "--getbinpkg",    "--getbinpkgonly",
 "--help",         "--noconfmem",
 "--newuse",       "--nocolor",
@@ -1853,10 +1854,14 @@
 				if (x[0]=="blocks") and ("--fetchonly" not in myopts):
 					raise Exception, "Merging a blocker"
 				elif ("--fetchonly" in myopts) or ("--fetch-all-uri" in myopts):
+					if ("--fetch-missing" in myopts):
+						fetchmissing=1
+					else:
+						fetchmissing=0
 					if ("--fetch-all-uri" in myopts):
-						retval=portage.doebuild(y,"fetch",myroot,self.pkgsettings,edebug,("--pretend" in myopts),fetchonly=1,fetchall=1)
+						retval=portage.doebuild(y,"fetch",myroot,self.pkgsettings,edebug,("--pretend" in myopts),fetchonly=1,fetchall=1,fetchmissing=fetchmissing)
 					else:
-						retval=portage.doebuild(y,"fetch",myroot,self.pkgsettings,edebug,("--pretend" in myopts),fetchonly=1)
+						retval=portage.doebuild(y,"fetch",myroot,self.pkgsettings,edebug,("--pretend" in myopts),fetchonly=1,fetchmissing=fetchmissing)
 					if (retval == None) or retval:
 						print
 						print "!!! Fetch for",y,"failed, continuing..."