Move buildd image building to binary hooks

debian/changelog

@@ -2,6 +2,7 @@ livecd-rootfs (2.408.43) UNRELEASED; urgency=medium
 
   * Add a buildd subproject.
   * Add a LXD image to builds for the buildd subproject.
+  * Move buildd image building to binary hooks.
 
  -- Colin Watson <cjwatson@ubuntu.com>  Mon, 14 Jan 2019 17:45:38 +0000
 

live-build/auto/build

@@ -17,7 +17,7 @@ fi
 
 . config/functions
 
-# Link output files somewhere BuildLiveCD will be able to find them.
+# Link output files somewhere launchpad-buildd will be able to find them.
 PREFIX="livecd.$PROJECT${SUBARCH:+-$SUBARCH}"
 
 if [ "${IMAGEFORMAT:-}" = "ubuntu-image" ]; then
@@ -405,28 +405,6 @@ if [ -e "binary/$INITFS/filesystem.dir" ]; then
 	chmod 644 "$PREFIX.rootfs.tar.gz"
 elif [ -e binary-tar.tar.gz ]; then
 	cp -a binary-tar.tar.gz "$PREFIX.rootfs.tar.gz"
-elif [ "$SUBPROJECT" = buildd ]; then
-	# A few things (launchpad-buildd, sbuild-launchpad-chroot) rely on
-	# the top-level directory being "chroot-autobuild", so we have to do
-	# this ourselves.
-	# gzip was chosen for fastest decompression speed: it decompresses
-	# buildd chroots about twice as fast as xz and about five times as
-	# fast as bzip2.
-	tar --transform='s,^binary,chroot-autobuild,' \
-		--sort=name --numeric-owner --xattrs \
-		-czf "$PREFIX.rootfs.tar.gz" binary
-
-	# Build a LXD image as well, which is preferable for some build types.
-	TMPDIR="$(mktemp -d)"
-	config/make-lxd-metadata "${LB_DISTRIBUTION%-*}" "$ARCH" >"$TMPDIR/metadata.yaml"
-	tar --numeric-owner -cf "$PREFIX.lxd.tar" -C "$TMPDIR" metadata.yaml
-	rm -rf "$TMPDIR"
-	# When using the combined metadata/rootfs form, the rootfs must be
-	# under rootfs/ rather than under chroot-autobuild/.
-	tar --transform='s,^binary,rootfs,' \
-		--sort=name --numeric-owner \
-		-rf "$PREFIX.lxd.tar" binary
-	gzip -9 "$PREFIX.lxd.tar"
 fi
 
 if [ "$PROJECT:${SUBPROJECT:-}" = "ubuntu-core:system-image" ]; then

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

@@ -0,0 +1,10 @@
+#! /bin/sh
+# A few things (launchpad-buildd, sbuild-launchpad-chroot) rely on the
+# top-level directory being "chroot-autobuild", so we have to do this
+# ourselves.
+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

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

@@ -0,0 +1,16 @@
+#! /bin/sh
+# Some build types prefer a LXD image over a traditional chroot tarball.
+set -e
+
+. config/bootstrap
+
+TMPDIR="$(mktemp -d)"
+config/make-lxd-metadata "${LB_DISTRIBUTION%-*}" "$ARCH" \
+	>"$TMPDIR/metadata.yaml"
+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
+gzip -9 "livecd.$PROJECT.lxd.tar"