Description: Build the wubildr bootloader for Wubi
Author: Evan Dandrea <ev@ubuntu.com>
Last-Update: 2012-08-20

Index: b/share/hooks/100-build-wubildr.binary
===================================================================
--- /dev/null
+++ b/share/hooks/100-build-wubildr.binary
@@ -0,0 +1,36 @@
+#! /bin/sh
+
+set -e
+
+# Build the wubildr bootloader for Wubi.
+
+cd ..
+CHROOT="$(mktemp -d)"
+# grub-mkimage needs to be able to find the source file of the loopback image
+# in the location that losetup knows it is; however, in a chroot this file wont
+# be present, so we need to make it so by the magic of bind mounts:
+mkdir -p "ubuntu/disks"
+# FIXME: swap these next two lines around when the buildds can handle ext4:
+# mv "binary/boot/filesystem.ext4" "ubuntu/disks/root.disk"
+mv "binary/boot/filesystem.ext3" "ubuntu/disks/root.disk"
+mount -o loop "ubuntu/disks/root.disk" "$CHROOT"
+# Save the directory structure mkdir created, so that it can be removed later.
+REMOVE="$(mkdir -pv "$CHROOT$PWD" | head -n1 | sed "s,.*\`\(.*\)',\1,")"
+mount -o bind "$PWD" "$CHROOT$PWD"
+chroot "$CHROOT" mount -t proc proc /proc
+# Expected to already exist.
+touch wubildr
+# grub-install cries unless you point it at something.
+chroot "$CHROOT" grub-install /dev/null
+umount "$CHROOT/proc"
+umount "$CHROOT$PWD"
+rm -rf "$REMOVE"
+# /host is normally created by partman-auto-loop.
+mkdir "$CHROOT/host"
+umount "$CHROOT"
+mv wubildr binary/boot
+# Link output files somewhere BuildLiveCD will be able to find them.
+PREFIX="livecd.$PROJECT${SUBARCH:+-$SUBARCH}"
+mv ubuntu/disks/root.disk binary/boot/root.disk
+rmdir -p ubuntu/disks
+tar cf - -C binary/boot root.disk wubildr | xz -9 > "$PREFIX.tar.xz"