ArchOS/manual-build/archos-bootstrap

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#!/bin/bash
# shellcheck disable=SC2059 # $1 and $2 can contain the printf modifiers
out() { printf "$1 $2\n" "${@:3}"; }
error() { out "==> ERROR:" "$@"; } >&2
warning() { out "==> WARNING:" "$@"; } >&2
msg() { out "==>" "$@"; }
die() { error "$@"; exit 1; }
ignore_error() {
"$@" 2>/dev/null
return 0
}
chroot_add_mount() {
mount "$@" && CHROOT_ACTIVE_MOUNTS=("$2" "${CHROOT_ACTIVE_MOUNTS[@]}")
}
chroot_setup() {
CHROOT_ACTIVE_MOUNTS=()
[[ $(trap -p EXIT) ]] && die '(BUG): attempting to overwrite existing EXIT trap'
trap 'chroot_teardown' EXIT
chroot_add_mount proc "$1/proc" -t proc -o nosuid,noexec,nodev &&
chroot_add_mount sys "$1/sys" -t sysfs -o nosuid,noexec,nodev,ro &&
ignore_error chroot_maybe_add_mount "[[ -d '$1/sys/firmware/efi/efivars' ]]" \
efivarfs "$1/sys/firmware/efi/efivars" -t efivarfs -o nosuid,noexec,nodev &&
chroot_add_mount udev "$1/dev" -t devtmpfs -o mode=0755,nosuid &&
chroot_add_mount devpts "$1/dev/pts" -t devpts -o mode=0620,gid=5,nosuid,noexec &&
chroot_add_mount shm "$1/dev/shm" -t tmpfs -o mode=1777,nosuid,nodev &&
chroot_add_mount /run "$1/run" --bind --make-private &&
chroot_add_mount tmp "$1/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
}
pid_unshare="unshare --fork --pid"
hostcache=0
copykeyring=1
initkeyring=0
copymirrorlist=1
pacman_args=()
pacmode=-Sy
copyconf=0
pacman_config=/etc/pacman.conf
default_package="base"
usage() {
cat <<EOF
usage: $(basename "$0") [options] root [packages...]
Options:
-C <config> Use an alternate config file for pacman
-c Use the package cache on the host, rather than the target
-D Skip pacman dependency checks
-G Avoid copying the host's pacman keyring to the target
-i Prompt for package confirmation when needed (run interactively)
-K Initialize an empty pacman keyring in the target (implies '-G')
-M Avoid copying the host's mirrorlist to the target
-P Copy the host's pacman config to the target
-U Use pacman -U to install packages
-h Print this help message
$(basename "$0") installs packages to the specified new root directory. If no packages
are given, $(basename "$0") defaults to the "$default_package" package/group.
EOF
}
bootstrap() {
(( EUID == 0 )) || die 'This script must be run with root privileges'
# create obligatory directories
msg 'Creating install root at %s' "$newroot"
# shellcheck disable=SC2174 # permissions are perfectly fine here
mkdir -m 0755 -p "$newroot"/var/{cache/pacman/pkg,lib/pacman,log} "$newroot"/{dev,run,etc/pacman.d}
# shellcheck disable=SC2174 # permissions are perfectly fine here
mkdir -m 1777 -p "$newroot"/tmp
# shellcheck disable=SC2174 # permissions are perfectly fine here
mkdir -m 0555 -p "$newroot"/{sys,proc}
# mount API filesystems
$setup "$newroot" || die "failed to setup chroot %s" "$newroot"
if [[ ! -d $newroot/etc/pacman.d/gnupg ]]; then
if (( initkeyring )); then
pacman-key --gpgdir "$newroot"/etc/pacman.d/gnupg --init
elif (( copykeyring )) && [[ -d /etc/pacman.d/gnupg ]]; then
# if there's a keyring on the host, copy it into the new root
cp -a --no-preserve=ownership /etc/pacman.d/gnupg "$newroot/etc/pacman.d/"
fi
fi
########################
msg 'Installing packages to %s' "$newroot"
if ! $pid_unshare pacman -r "$newroot" "${pacman_args[@]}"; then
die 'Failed to install packages to new root'
fi
########################
if (( copymirrorlist )); then
# install the host's mirrorlist onto the new root
cp -a /etc/pacman.d/mirrorlist "$newroot/etc/pacman.d/"
fi
if (( copyconf )); then
cp -a "$pacman_config" "$newroot/etc/pacman.conf"
fi
}
if [[ -z $1 || $1 = @(-h|--help) ]]; then
usage
exit $(( $# ? 0 : 1 ))
fi
while getopts ':C:cDGiKMNPU' flag; do
case $flag in
C)
pacman_config=$OPTARG
;;bootstrap
D)
pacman_args+=(-dd)
;;
c)
hostcache=1
;;
i)
interactive=1
;;
G)
copykeyring=0
;;
K)
initkeyring=1
;;
M)
copymirrorlist=0
;;
P)
copyconf=1
;;
U)
pacmode=-U
;;
:)
die '%s: option requires an argument -- '\''%s'\' "${0##*/}" "$OPTARG"
;;
?)
die '%s: invalid option -- '\''%s'\' "${0##*/}" "$OPTARG"
;;
esac
done
shift $(( OPTIND - 1 ))
(( $# )) || die "No root directory specified"
newroot=$1
shift
[[ -d $newroot ]] || die "%s is not a directory" "$newroot"
pacman_args+=("$pacmode" "${@:-base}" --config="$pacman_config")
if (( ! hostcache )); then
pacman_args+=(--cachedir="$newroot/var/cache/pacman/pkg")
fi
if (( ! interactive )); then
pacman_args+=(--noconfirm)
fi
setup=chroot_setup
bootstrap