add pacstrap script

parent 9a0852c4
#!/bin/bash
#
# Assumptions:
# 1) User has partitioned, formatted, and mounted partitions on /mnt
# 2) Network is functional
# 3) Arguments passed to the script are valid pacman targets
# 4) A valid mirror appears in /etc/pacman.d/mirrorlist
#
shopt -s extglob
# generated from util-linux source: libmount/src/utils.c
declare -A pseudofs_types=([anon_inodefs]=1
[autofs]=1
[bdev]=1
[bpf]=1
[binfmt_misc]=1
[cgroup]=1
[cgroup2]=1
[configfs]=1
[cpuset]=1
[debugfs]=1
[devfs]=1
[devpts]=1
[devtmpfs]=1
[dlmfs]=1
[efivarfs]=1
[fuse.gvfs-fuse-daemon]=1
[fusectl]=1
[hugetlbfs]=1
[mqueue]=1
[nfsd]=1
[none]=1
[pipefs]=1
[proc]=1
[pstore]=1
[ramfs]=1
[rootfs]=1
[rpc_pipefs]=1
[securityfs]=1
[sockfs]=1
[spufs]=1
[sysfs]=1
[tmpfs]=1)
# generated from: pkgfile -vbr '/fsck\..+' | awk -F. '{ print $NF }' | sort
declare -A fsck_types=([cramfs]=1
[exfat]=1
[ext2]=1
[ext3]=1
[ext4]=1
[ext4dev]=1
[jfs]=1
[minix]=1
[msdos]=1
[reiserfs]=1
[vfat]=1
[xfs]=1)
out() { printf "$1 $2\n" "${@:3}"; }
error() { out "==> ERROR:" "$@"; } >&2
warning() { out "==> WARNING:" "$@"; } >&2
msg() { out "==>" "$@"; }
msg2() { out " ->" "$@";}
die() { error "$@"; exit 1; }
ignore_error() {
"$@" 2>/dev/null
return 0
}
in_array() {
local i
for i in "${@:2}"; do
[[ $1 = "$i" ]] && return 0
done
return 1
}
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 "$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 &&
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
}
try_cast() (
_=$(( $1#$2 ))
) 2>/dev/null
valid_number_of_base() {
local base=$1 len=${#2} i=
for (( i = 0; i < len; i++ )); do
try_cast "$base" "${2:i:1}" || return 1
done
return 0
}
mangle() {
local i= chr= out=
local {a..f}= {A..F}=
for (( i = 0; i < ${#1}; i++ )); do
chr=${1:i:1}
case $chr in
[[:space:]\\])
printf -v chr '%03o' "'$chr"
out+=\\
;;
esac
out+=$chr
done
printf '%s' "$out"
}
unmangle() {
local i= chr= out= len=$(( ${#1} - 4 ))
local {a..f}= {A..F}=
for (( i = 0; i < len; i++ )); do
chr=${1:i:1}
case $chr in
\\)
if valid_number_of_base 8 "${1:i+1:3}" ||
valid_number_of_base 16 "${1:i+1:3}"; then
printf -v chr '%b' "${1:i:4}"
(( i += 3 ))
fi
;;
esac
out+=$chr
done
printf '%s' "$out${1:i}"
}
optstring_match_option() {
local candidate pat patterns
IFS=, read -ra patterns <<<"$1"
for pat in "${patterns[@]}"; do
if [[ $pat = *=* ]]; then
# "key=val" will only ever match "key=val"
candidate=$2
else
# "key" will match "key", but also "key=anyval"
candidate=${2%%=*}
fi
[[ $pat = "$candidate" ]] && return 0
done
return 1
}
optstring_remove_option() {
local o options_ remove=$2 IFS=,
read -ra options_ <<<"${!1}"
for o in "${!options_[@]}"; do
optstring_match_option "$remove" "${options_[o]}" && unset 'options_[o]'
done
declare -g "$1=${options_[*]}"
}
optstring_normalize() {
local o options_ norm IFS=,
read -ra options_ <<<"${!1}"
# remove empty fields
for o in "${options_[@]}"; do
[[ $o ]] && norm+=("$o")
done
# avoid empty strings, reset to "defaults"
declare -g "$1=${norm[*]:-defaults}"
}
optstring_append_option() {
if ! optstring_has_option "$1" "$2"; then
declare -g "$1=${!1},$2"
fi
optstring_normalize "$1"
}
optstring_prepend_option() {
local options_=$1
if ! optstring_has_option "$1" "$2"; then
declare -g "$1=$2,${!1}"
fi
optstring_normalize "$1"
}
optstring_get_option() {
local opts o
IFS=, read -ra opts <<<"${!1}"
for o in "${opts[@]}"; do
if optstring_match_option "$2" "$o"; then
declare -g "$o"
return 0
fi
done
return 1
}
optstring_has_option() {
local "${2%%=*}"
optstring_get_option "$1" "$2"
}
dm_name_for_devnode() {
read dm_name <"/sys/class/block/${1#/dev/}/dm/name"
if [[ $dm_name ]]; then
printf '/dev/mapper/%s' "$dm_name"
else
# don't leave the caller hanging, just print the original name
# along with the failure.
print '%s' "$1"
error 'Failed to resolve device mapper name for: %s' "$1"
fi
}
fstype_is_pseudofs() {
(( pseudofs_types["$1"] ))
}
fstype_has_fsck() {
(( fsck_types["$1"] ))
}
hostcache=0
copykeyring=1
copymirrorlist=1
pacmode=-Sy
usage() {
cat <<EOF
usage: ${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
-G Avoid copying the host's pacman keyring to the target
-i Prompt for package confirmation when needed (run interactively)
-M Avoid copying the host's mirrorlist to the target
-U Use pacman -U to install packages
-h Print this help message
pacstrap installs packages to the specified new root directory. If no packages
are given, pacstrap defaults to the "base" group.
EOF
}
if [[ -z $1 || $1 = @(-h|--help) ]]; then
usage
exit $(( $# ? 0 : 1 ))
fi
(( EUID == 0 )) || die 'This script must be run with root privileges'
while getopts ':C:cdGiMU' flag; do
case $flag in
C)
pacman_config=$OPTARG
;;
d)
# retired flag. does nothing.
;;
c)
hostcache=1
;;
i)
interactive=1
;;
G)
copykeyring=0
;;
M)
copymirrorlist=0
;;
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=$1; shift
pacman_args=("${@:-base}")
if (( ! hostcache )); then
pacman_args+=(--cachedir="$newroot/var/cache/pacman/pkg")
fi
if (( ! interactive )); then
pacman_args+=(--noconfirm)
fi
if [[ $pacman_config ]]; then
pacman_args+=(--config="$pacman_config")
fi
[[ -d $newroot ]] || die "%s is not a directory" "$newroot"
# create obligatory directories
msg 'Creating install root at %s' "$newroot"
mkdir -m 0755 -p "$newroot"/var/{cache/pacman/pkg,lib/pacman,log} "$newroot"/{dev,run,etc/pacman.d}
mkdir -m 1777 -p "$newroot"/tmp
mkdir -m 0555 -p "$newroot"/{sys,proc}
# mount API filesystems
chroot_setup "$newroot" || die "failed to setup chroot %s" "$newroot"
if (( copykeyring )); then
# if there's a keyring on the host, copy it into the new root, unless it exists already
if [[ -d /etc/pacman.d/gnupg && ! -d $newroot/etc/pacman.d/gnupg ]]; then
cp -a /etc/pacman.d/gnupg "$newroot/etc/pacman.d/"
fi
fi
msg 'Installing packages to %s' "$newroot"
if ! unshare --fork --pid pacman -r "$newroot" $pacmode "${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
# vim: et ts=2 sw=2 ft=sh:
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