/usr/share/live/build/hooks/100-build-wubildr.binary is in live-build 3.0~a57-1ubuntu11.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 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"
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