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#!/bin/sh
# This script is intended for root users to automatically mount requried dirs and chroot into an installed system
# simplifed version of arch-chroot from <https://github.com/archlinux/arch-install-scripts>
args=$@
target=$1
die() { printf "$@\n"; exit 1;}
ignore_error() {
"$@" 2>/dev/null
return 0
}
chroot_add_mount() {
mount "$@" && CHROOT_ACTIVE_MOUNTS="$2 $CHROOT_ACTIVE_MOUNTS"
}
chroot_maybe_add_mount() {
local cond=$1; shift
if eval "$cond"; then
chroot_add_mount "$@"
fi
}
chroot_setup() {
CHROOT_ACTIVE_MOUNTS=""
trap 'chroot_teardown' EXIT
chroot_add_mount proc "$target/proc" -t proc -o nosuid,noexec,nodev
chroot_add_mount sys "$target/sys" -t sysfs -o nosuid,noexec,nodev,ro
ignore_error chroot_maybe_add_mount "[ -d '$1/sys/firmware/efi/efivars' ]" \
efivarfs "$target/sys/firmware/efi/efivars" -t efivarfs -o nosuid,noexec,nodev
chroot_add_mount udev "$target/dev" -t devtmpfs -o mode=0755,nosuid
chroot_add_mount devpts "$target/dev/pts" -t devpts -o mode=0620,gid=5,nosuid,noexec
chroot_add_mount shm "$target/dev/shm" -t tmpfs -o mode=1777,nosuid,nodev
chroot_add_mount /run "$target/run" --bind
chroot_add_mount tmp "$target/tmp" -t tmpfs -o mode=1777,strictatime,nodev,nosuid
}
chroot_teardown() {
[ -n "$CHROOT_ACTIVE_MOUNTS" ] &&
umount "$CHROOT_ACTIVE_MOUNTS"
unset CHROOT_ACTIVE_MOUNTS
}
[ "$(id -u)" -eq 0 ] || die "Please run this as root"
[ -d "$target" ] || die "$target is not a directory; cannot chroot!"
chroot_setup $@
if [ $# -gt 1 ]; then
chroot $@
else
chroot $@ /bin/sh -l
fi
chroot_teardown
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