Enable building buildd artifacts with an ext4 image target.

live-build/buildd/hooks/00-mirror.binary

@@ -9,4 +9,4 @@ set -e
 # /var/lib/apt/lists/ has suitable cached Packages files; this speeds up
 # builds on buildds.
 sed -i "s,${LB_PARENT_MIRROR_BINARY},${LB_MIRROR_BINARY},g" \
-	binary/etc/apt/sources.list
+	chroot/etc/apt/sources.list

live-build/buildd/hooks/01-policy-rc-d.binary

@@ -6,8 +6,8 @@ set -e
 # installed, but that doesn't work because live-build has already installed
 # a dummy one at that point.  The simplest approach is to repair the
 # situation by putting it in place here.
-if [ -L binary/etc/alternatives/policy-rc.d ] && \
-   [ ! -e binary/usr/sbin/policy-rc.d ] && \
-   [ ! -L binary/usr/sbin/policy-rc.d ]; then
-	ln -s /etc/alternatives/policy-rc.d binary/usr/sbin/policy-rc.d
+if [ -L chroot/etc/alternatives/policy-rc.d ] && \
+   [ ! -e chroot/usr/sbin/policy-rc.d ] && \
+   [ ! -L chroot/usr/sbin/policy-rc.d ]; then
+	ln -s /etc/alternatives/policy-rc.d chroot/usr/sbin/policy-rc.d
 fi

live-build/buildd/hooks/50-buildd-tar.binary

@@ -6,5 +6,5 @@ set -e
 
 # gzip was chosen for fastest decompression speed: it decompresses buildd
 # chroots about twice as fast as xz and about five times as fast as bzip2.
-tar --transform='s,^binary,chroot-autobuild,' --sort=name --numeric-owner \
-	-czf "livecd.$PROJECT.rootfs.tar.gz" binary
+tar --transform='s,^chroot,chroot-autobuild,' --sort=name --numeric-owner \
+	-czf "livecd.$PROJECT.rootfs.tar.gz" chroot

live-build/buildd/hooks/51-buildd-lxd.binary

@@ -11,6 +11,6 @@ tar --numeric-owner -cf "livecd.$PROJECT.lxd.tar" -C "$TMPDIR" metadata.yaml
 rm -rf "$TMPDIR"
 # When using the combined metadata/rootfs form, the rootfs must be under
 # rootfs/ rather than under chroot-autobuild/.
-tar --transform='s,^binary,rootfs,' --sort=name --numeric-owner \
-	-rf "livecd.$PROJECT.lxd.tar" binary
+tar --transform='s,^chroot,rootfs,' --sort=name --numeric-owner \
+	-rf "livecd.$PROJECT.lxd.tar" chroot
 gzip -9 "livecd.$PROJECT.lxd.tar"