2020-09-11 21:27:59 +02:00
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#!/bin/bash
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# This script builds a Debian root filesystem image for testing libbpf in a
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# virtual machine. Requires debootstrap >= 1.0.95 and zstd.
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2022-05-09 12:59:54 +02:00
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# Use e.g. ./mkrootfs_debian.sh --arch=s390x to generate a rootfs for a
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# foreign architecture. Requires configured binfmt_misc, e.g. using
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# Debian/Ubuntu's qemu-user-binfmt package or
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# https://github.com/multiarch/qemu-user-static.
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2020-09-11 21:27:59 +02:00
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set -e -u -x -o pipefail
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# Check whether we are root now in order to avoid confusing errors later.
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if [ "$(id -u)" != 0 ]; then
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echo "$0 must run as root" >&2
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exit 1
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fi
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# Create a working directory and schedule its deletion.
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root=$(mktemp -d -p "$PWD")
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trap 'rm -r "$root"' EXIT
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# Install packages.
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2022-05-19 13:09:36 +02:00
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packages=(
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binutils
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busybox
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elfutils
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ethtool
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iproute2
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iptables
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libcap2
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libelf1
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strace
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zlib1g
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)
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packages=$(IFS=, && echo "${packages[*]}")
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2022-05-09 12:59:54 +02:00
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debootstrap --include="$packages" --variant=minbase "$@" bookworm "$root"
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2020-09-11 21:27:59 +02:00
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# Remove the init scripts (tests use their own). Also remove various
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# unnecessary files in order to save space.
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rm -rf \
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"$root"/etc/rcS.d \
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"$root"/usr/share/{doc,info,locale,man,zoneinfo} \
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"$root"/var/cache/apt/archives/* \
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"$root"/var/lib/apt/lists/*
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# Apply common tweaks.
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"$(dirname "$0")"/mkrootfs_tweak.sh "$root"
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# Save the result.
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name="libbpf-vmtest-rootfs-$(date +%Y.%m.%d).tar.zst"
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rm -f "$name"
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tar -C "$root" -c . | zstd -T0 -19 -o "$name"
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