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#!/bin/bash
# This script is based on drgn script for generating Arch Linux bootstrap
# images.
# https://github.com/osandov/drgn/blob/master/scripts/vmtest/mkrootfs.sh
set -euo pipefail
usage () {
USAGE_STRING="usage: $0 [NAME]
$0 -h
Build an Arch Linux root filesystem image for testing libbpf in a virtual
machine.
The image is generated as a zstd-compressed tarball.
This must be run as root, as most of the installation is done in a chroot.
Arguments:
NAME name of generated image file (default:
libbpf-vmtest-rootfs-\$DATE.tar.zst)
Options:
-h display this help message and exit"
case "$1" in
out)
echo "$USAGE_STRING"
exit 0
;;
err)
echo "$USAGE_STRING" >&2
exit 1
;;
esac
}
while getopts "h" OPT; do
case "$OPT" in
h)
usage out
;;
*)
usage err
;;
esac
done
if [[ $OPTIND -eq $# ]]; then
NAME="${!OPTIND}"
elif [[ $OPTIND -gt $# ]]; then
NAME="libbpf-vmtest-rootfs-$(date +%Y.%m.%d).tar.zst"
else
usage err
fi
pacman_conf=
root=
trap 'rm -rf "$pacman_conf" "$root"' EXIT
pacman_conf="$(mktemp -p "$PWD")"
cat > "$pacman_conf" << "EOF"
[options]
Architecture = x86_64
CheckSpace
SigLevel = Required DatabaseOptional
[core]
Include = /etc/pacman.d/mirrorlist
[extra]
Include = /etc/pacman.d/mirrorlist
[community]
Include = /etc/pacman.d/mirrorlist
EOF
root="$(mktemp -d -p "$PWD")"
packages=(
busybox
# libbpf dependencies.
libelf
zlib
# selftests test_progs dependencies.
binutils
elfutils
ethtool
glibc
iproute2
# selftests test_verifier dependencies.
libcap
)
pacstrap -C "$pacman_conf" -cGM "$root" "${packages[@]}"
# Remove unnecessary files from the chroot.
# We don't need the pacman databases anymore.
rm -rf "$root/var/lib/pacman/sync/"
# We don't need D, Fortran, or Go.
rm -f "$root/usr/lib/libgdruntime."* \
"$root/usr/lib/libgphobos."* \
"$root/usr/lib/libgfortran."* \
"$root/usr/lib/libgo."*
# We don't need any documentation.
rm -rf "$root/usr/share/{doc,help,man,texinfo}"
"$(dirname "$0")"/mkrootfs_tweak.sh "$root"
tar -C "$root" -c . | zstd -T0 -19 -o "$NAME"
chmod 644 "$NAME"
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