xbps-src: added suport for XBPS_CACHEDIR in configuration file.

XBPS_CACHEDIR will be bind mounted as read/write in target masterdir
into /cachedir. This directory must have read/write perms for the user
running xbps-src.

xbps-src/libexec/xbps-src-chroot-helper.sh.in

@@ -1,6 +1,6 @@
 #!/bin/sh
 #-
-# Copyright (c) 2010 Juan Romero Pardines.
+# Copyright (c) 2010-2011 Juan Romero Pardines.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -31,8 +31,11 @@ HANDLER="$1"
 if [ -n "${MASTERDIR}" ]; then
 	export XBPS_MASTERDIR="${MASTERDIR}"
 fi
+if [ -n "${CACHEDIR}" ]; then
+	export XBPS_CACHEDIR="${CACHEDIR}"
+fi
 
-REQFS="sys proc dev xbps"
+REQFS="sys proc dev xbps cachedir"
 
 mount_chroot_fs()
 {
@@ -50,6 +53,10 @@ mount_chroot_fs()
 					blah=${XBPS_DISTRIBUTIONDIR}
 					dowrite="-w"
 					;;
+				cachedir)
+					blah=${XBPS_CACHEDIR}
+					dowrite="-w"
+					;;
 				*) blah=/${f};;
 			esac
 			[ ! -d ${blah} ] && echo "failed." && continue
@@ -60,7 +67,7 @@ mount_chroot_fs()
 				echo 1 > ${XBPS_MASTERDIR}/.${f}_mount_bind_done
 				echo "done."
 			else
-				echo "FAILED!!!!!"
+				echo "FAILED!"
 				exit 1
 			fi
 		else