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#!/bin/bash
abort() {
echo "$1" >&2
exit 1
}
rootdir="$1"
# avoid messing with host system
[[ -n $rootdir ]] || abort "root directory is not set"
# set up local apt archive
mkdir -p $rootdir/usr/local/share/archive
echo "deb [trusted=yes] file:/usr/local/share/archive ./" > $rootdir/etc/apt/sources.list.d/local.list
# mount local apt archive from host on startup
echo 9p >> $rootdir/etc/initramfs-tools/modules
echo 9pnet >> $rootdir/etc/initramfs-tools/modules
echo 9pnet_virtio >> $rootdir/etc/initramfs-tools/modules
echo "host0 /usr/local/share/archive 9p trans=virtio,version=9p2000.L 0 0" >> $rootdir/etc/fstab
# boot immediately
sed --in-place 's/GRUB_TIMEOUT=[0-9]\+/GRUB_TIMEOUT=0/g' $rootdir/etc/default/grub
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