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#!/bin/bash
# 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=()
[[ $(trap -p EXIT) ]] && die '(BUG): attempting to overwrite existing EXIT trap'
trap 'chroot_teardown' EXIT
chroot_add_mount proc "$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() {
if (( ${#CHROOT_ACTIVE_MOUNTS[@]} )); then
umount "${CHROOT_ACTIVE_MOUNTS[@]}"
fi
unset CHROOT_ACTIVE_MOUNTS
}
[ "$EUID" -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
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