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https://gitee.com/openharmony/third_party_libbpf
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10e4311ad7
Generate a disk image for libbpf testing in compressed *.zst format The mkrootfs.sh has the following stages: - run pacstrap to install libbpf and selftests dependencies. - create /etc/fstab w/ bpffs and debugfs filesystems - create /etc/init.d/rcS to mount in bootime - create /etc/inittab to invoke /etc/init.d/rcS - compress an image In addition ./travis-ci/vmtest/run.sh set up ext4 fs and mounts it as a loop device: mkfs.ext4 -q "$tmp" mount -o loop "$tmp" "$mnt" Signed-off-by: Julia Kartseva (hex@fb.com)
147 lines
2.9 KiB
Bash
Executable File
147 lines
2.9 KiB
Bash
Executable File
#!/bin/bash
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# This script is based on drgn script for generating Arch Linux bootstrap
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# images.
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# https://github.com/osandov/drgn/blob/master/scripts/vmtest/mkrootfs.sh
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set -euo pipefail
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usage () {
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USAGE_STRING="usage: $0 [NAME]
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$0 -h
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Build an Arch Linux root filesystem image for testing libbpf in a virtual
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machine.
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The image is generated as a zstd-compressed tarball.
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This must be run as root, as most of the installation is done in a chroot.
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Arguments:
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NAME name of generated image file (default:
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libbpf-vmtest-rootfs-\$DATE.tar.zst)
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Options:
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-h display this help message and exit"
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case "$1" in
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out)
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echo "$USAGE_STRING"
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exit 0
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;;
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err)
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echo "$USAGE_STRING" >&2
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exit 1
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;;
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esac
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}
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while getopts "h" OPT; do
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case "$OPT" in
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h)
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usage out
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;;
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*)
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usage err
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;;
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esac
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done
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if [[ $OPTIND -eq $# ]]; then
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NAME="${!OPTIND}"
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elif [[ $OPTIND -gt $# ]]; then
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NAME="libbpf-vmtest-rootfs-$(date +%Y.%m.%d).tar.zst"
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else
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usage err
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fi
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pacman_conf=
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root=
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trap 'rm -rf "$pacman_conf" "$root"' EXIT
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pacman_conf="$(mktemp -p "$PWD")"
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cat > "$pacman_conf" << "EOF"
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[options]
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Architecture = x86_64
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CheckSpace
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SigLevel = Required DatabaseOptional
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[core]
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Include = /etc/pacman.d/mirrorlist
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[extra]
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Include = /etc/pacman.d/mirrorlist
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[community]
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Include = /etc/pacman.d/mirrorlist
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EOF
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root="$(mktemp -d -p "$PWD")"
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packages=(
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busybox
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# libbpf dependencies.
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libelf
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zlib
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# selftests test_progs dependencies.
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binutils
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elfutils
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glibc
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# selftests test_verifier dependencies.
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libcap
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)
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pacstrap -C "$pacman_conf" -cGM "$root" "${packages[@]}"
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# Remove unnecessary files from the chroot.
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# We don't need the pacman databases anymore.
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rm -rf "$root/var/lib/pacman/sync/"
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# We don't need D, Fortran, or Go.
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rm -f "$root/usr/lib/libgdruntime."* \
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"$root/usr/lib/libgphobos."* \
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"$root/usr/lib/libgfortran."* \
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"$root/usr/lib/libgo."*
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# We don't need any documentation.
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rm -rf "$root/usr/share/doc" \
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"$root/usr/share/help" \
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"$root/usr/share/man" \
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"$root/usr/share/texinfo"
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chroot "${root}" /bin/busybox --install
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cat > "$root/etc/fstab" << "EOF"
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dev /dev devtmpfs rw,nosuid 0 0
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proc /proc proc rw,nosuid,nodev,noexec 0 0
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sys /sys sysfs rw,nosuid,nodev,noexec 0 0
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debugfs /sys/kernel/debug debugfs mode=755,realtime 0 0
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bpffs /sys/fs/bpf bpf realtime 0 0
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EOF
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chmod 644 "$root/etc/fstab"
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cat > "$root/etc/inittab" << "EOF"
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::sysinit:/etc/init.d/rcS
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::ctrlaltdel:/sbin/reboot
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::shutdown:/sbin/swapoff -a
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::shutdown:/bin/umount -a -r
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::restart:/sbin/init
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EOF
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chmod 644 "$root/etc/inittab"
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mkdir -m 755 "$root/etc/init.d" "$root/etc/rcS.d"
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cat > "$root/etc/rcS.d/S40network" << "EOF"
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#!/bin/sh
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ip link set lo up
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EOF
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chmod 755 "$root/etc/rcS.d/S40network"
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cat > "$root/etc/init.d/rcS" << "EOF"
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#!/bin/sh
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/bin/mount -a
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for path in /etc/rcS.d/S*; do
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[ -x "$path" ] && "$path"
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done
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EOF
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chmod 755 "$root/etc/init.d/rcS"
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chmod 755 "$root"
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tar -C "$root" -c . | zstd -T0 -19 -o "$NAME"
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chmod 644 "$NAME"
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