359 lines
8.8 KiB
Text
359 lines
8.8 KiB
Text
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#!/bin/bash
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shopt -s extglob
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# generated from util-linux source: libmount/src/utils.c
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declare -A pseudofs_types=([anon_inodefs]=1
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[autofs]=1
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[bdev]=1
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[binfmt_misc]=1
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[cgroup]=1
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[configfs]=1
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[cpuset]=1
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[debugfs]=1
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[devfs]=1
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[devpts]=1
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[devtmpfs]=1
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[dlmfs]=1
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[fuse.gvfs-fuse-daemon]=1
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[fusectl]=1
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[hugetlbfs]=1
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[mqueue]=1
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[nfsd]=1
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[none]=1
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[pipefs]=1
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[proc]=1
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[pstore]=1
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[ramfs]=1
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[rootfs]=1
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[rpc_pipefs]=1
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[securityfs]=1
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[sockfs]=1
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[spufs]=1
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[sysfs]=1
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[tmpfs]=1)
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# generated from: pkgfile -vbr '/fsck\..+' | awk -F. '{ print $NF }' | sort
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declare -A fsck_types=([cramfs]=1
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[exfat]=1
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[ext2]=1
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[ext3]=1
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[ext4]=1
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[ext4dev]=1
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[jfs]=1
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[minix]=1
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[msdos]=1
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[reiserfs]=1
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[vfat]=1
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[xfs]=1)
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out() { printf "$1 $2\n" "${@:3}"; }
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error() { out "==> ERROR:" "$@"; } >&2
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msg() { out "==>" "$@"; }
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msg2() { out " ->" "$@";}
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die() { error "$@"; exit 1; }
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ignore_error() {
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"$@" 2>/dev/null
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return 0
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}
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in_array() {
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local i
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for i in "${@:2}"; do
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[[ $1 = "$i" ]] && return
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done
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}
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track_mount() {
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if [[ -z $CHROOT_ACTIVE_MOUNTS ]]; then
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CHROOT_ACTIVE_MOUNTS=()
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trap 'chroot_umount' EXIT
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fi
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mount "$@" && CHROOT_ACTIVE_MOUNTS=("$2" "${CHROOT_ACTIVE_MOUNTS[@]}")
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}
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mount_conditionally() {
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local cond=$1; shift
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if eval "$cond"; then
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track_mount "$@"
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fi
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}
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api_fs_mount() {
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mount_conditionally "! mountpoint -q '$1'" "$1" "$1" --bind &&
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track_mount proc "$1/proc" -t proc -o nosuid,noexec,nodev &&
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track_mount sys "$1/sys" -t sysfs -o nosuid,noexec,nodev,ro &&
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ignore_error mount_conditionally "[[ -d '$1/sys/firmware/efi/efivars' ]]" \
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efivarfs "$1/sys/firmware/efi/efivars" -t efivarfs -o nosuid,noexec,nodev &&
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track_mount udev "$1/dev" -t devtmpfs -o mode=0755,nosuid &&
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track_mount devpts "$1/dev/pts" -t devpts -o mode=0620,gid=5,nosuid,noexec &&
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track_mount shm "$1/dev/shm" -t tmpfs -o mode=1777,nosuid,nodev &&
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track_mount run "$1/run" -t tmpfs -o nosuid,nodev,mode=0755 &&
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track_mount tmp "$1/tmp" -t tmpfs -o mode=1777,strictatime,nodev,nosuid
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}
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chroot_umount() {
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umount "${CHROOT_ACTIVE_MOUNTS[@]}"
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}
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valid_number_of_base() {
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local base=$1 len=${#2} i=
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for (( i = 0; i < len; i++ )); do
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{ _=$(( $base#${2:i:1} )) || return 1; } 2>/dev/null
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done
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return 0
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}
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mangle() {
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local i= chr= out=
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unset {a..f} {A..F}
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for (( i = 0; i < ${#1}; i++ )); do
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chr=${1:i:1}
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case $chr in
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[[:space:]\\])
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printf -v chr '%03o' "'$chr"
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out+=\\
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;;
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esac
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out+=$chr
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done
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printf '%s' "$out"
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}
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unmangle() {
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local i= chr= out= len=$(( ${#1} - 4 ))
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unset {a..f} {A..F}
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for (( i = 0; i < len; i++ )); do
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chr=${1:i:1}
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case $chr in
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\\)
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if valid_number_of_base 8 "${1:i+1:3}" ||
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valid_number_of_base 16 "${1:i+1:3}"; then
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printf -v chr '%b' "${1:i:4}"
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(( i += 3 ))
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fi
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;;
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esac
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out+=$chr
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done
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printf '%s' "$out${1:i}"
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}
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dm_name_for_devnode() {
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read dm_name <"/sys/class/block/${1#/dev/}/dm/name"
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if [[ $dm_name ]]; then
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printf '/dev/mapper/%s' "$dm_name"
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else
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# don't leave the caller hanging, just print the original name
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# along with the failure.
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print '%s' "$1"
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error 'Failed to resolve device mapper name for: %s' "$1"
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fi
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}
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fstype_is_pseudofs() {
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(( pseudofs_types["$1"] ))
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}
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fstype_has_fsck() {
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(( fsck_types["$1"] ))
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}
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write_source() {
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local src=$1 spec= label= uuid= comment=()
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label=$(lsblk -rno LABEL "$1" 2>/dev/null)
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uuid=$(lsblk -rno UUID "$1" 2>/dev/null)
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# bind mounts do not have a UUID!
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case $bytag in
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'')
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[[ $uuid ]] && comment=("UUID=$uuid")
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[[ $label ]] && comment+=("LABEL=$(mangle "$label")")
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;;
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LABEL)
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spec=$label
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[[ $uuid ]] && comment=("$src" "UUID=$uuid")
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;;
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UUID)
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spec=$uuid
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comment=("$src")
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[[ $label ]] && comment+=("LABEL=$(mangle "$label")")
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;;
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*)
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[[ $uuid ]] && comment=("$1" "UUID=$uuid")
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[[ $label ]] && comment+=("LABEL=$(mangle "$label")")
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[[ $bytag ]] && spec=$(lsblk -rno "$bytag" "$1" 2>/dev/null)
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;;
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esac
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[[ $comment ]] && printf '# %s\n' "${comment[*]}"
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if [[ $spec ]]; then
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printf '%-20s' "$bytag=$(mangle "$spec")"
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else
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printf '%-20s' "$(mangle "$src")"
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fi
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}
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usage() {
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cat <<EOF
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usage: ${0##*/} [options] root
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Options:
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-L Use labels for source identifiers (shortcut for -t LABEL)
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-p Avoid printing pseudofs mounts
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-t TAG Use TAG for source identifiers
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-U Use UUIDs for source identifiers (shortcut for -t UUID)
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-h Print this help message
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genfstab generates output suitable for addition to an fstab file based on the
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devices mounted under the mountpoint specified by the given root.
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EOF
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}
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if [[ -z $1 || $1 = @(-h|--help) ]]; then
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usage
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exit $(( $# ? 0 : 1 ))
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fi
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while getopts ':Lpt:U' flag; do
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case $flag in
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L)
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bytag=LABEL
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;;
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U)
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bytag=UUID
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;;
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p)
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nopseudofs=1
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;;
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t)
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bytag=${OPTARG^^}
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;;
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:)
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die '%s: option requires an argument -- '\''%s'\' "${0##*/}" "$OPTARG"
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;;
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?)
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die '%s: invalid option -- '\''%s'\' "${0##*/}" "$OPTARG"
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;;
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esac
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done
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shift $(( OPTIND - 1 ))
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(( $# )) || die "No root directory specified"
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root=$1; shift
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if ! mountpoint -q "$root"; then
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die "$root is not a mountpoint"
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fi
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# handle block devices
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findmnt -Recvruno SOURCE,TARGET,FSTYPE,OPTIONS,FSROOT "$root" |
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while read -r src target fstype opts fsroot; do
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if (( nopseudofs )) && fstype_is_pseudofs "$fstype"; then
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continue
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fi
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# default 5th and 6th columns
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dump=0 pass=2
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src=$(unmangle "$src")
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target=$(unmangle "$target")
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target=${target#$root}
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if (( !foundroot )) && findmnt "$src" "$root" >/dev/null; then
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# this is root. we can't possibly have more than one...
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pass=1 foundroot=1
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fi
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# if there's no fsck tool available, then only pass=0 makes sense.
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if ! fstype_has_fsck "$fstype"; then
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pass=0
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fi
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if [[ $fsroot != / ]]; then
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if [[ $fstype = btrfs ]]; then
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opts+=,subvol=${fsroot#/}
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else
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# it's a bind mount
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src=$(findmnt -funcevo TARGET "$src")$fsroot
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if [[ $src -ef $target ]]; then
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# hrmm, this is weird. we're probably looking at a file or directory
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# that was bound into a chroot from the host machine. Ignore it,
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# because this won't actually be a valid mount. Worst case, the user
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# just re-adds it.
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continue
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fi
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fstype=none
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opts+=,bind
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pass=0
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fi
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fi
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# filesystem quirks
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case $fstype in
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fuseblk)
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# well-behaved FUSE filesystems will report themselves as fuse.$fstype.
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# this is probably NTFS-3g, but let's just make sure.
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if ! newtype=$(lsblk -no FSTYPE "$src") || [[ -z $newtype ]]; then
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# avoid blanking out fstype, leading to an invalid fstab
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error 'Failed to derive real filesystem type for FUSE device on %s' "$target"
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else
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fstype=$newtype
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fi
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;;
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esac
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# write one line
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write_source "$src"
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printf '\t%-10s' "/$(mangle "${target#/}")" "$fstype" "$opts"
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printf '\t%s %s' "$dump" "$pass"
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printf '\n\n'
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done
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# handle swaps devices
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{
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# ignore header
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read
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while read -r device type _ _ prio; do
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options=defaults
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if [[ $prio != -1 ]]; then
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options+=,pri=$prio
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fi
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# skip files marked deleted by the kernel
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[[ $device = *'\040(deleted)' ]] && continue
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if [[ $type = file ]]; then
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printf '%-20s' "$device"
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elif [[ $device = /dev/dm-+([0-9]) ]]; then
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# device mapper doesn't allow characters we need to worry
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# about being mangled, and it does the escaping of dashes
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# for us in sysfs.
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write_source "$(dm_name_for_devnode "$device")"
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else
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write_source "$(unmangle "$device")"
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fi
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printf '\t%-10s\t%-10s\t%-10s\t0 0\n\n' 'none' 'swap' "$options"
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done
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} </proc/swaps
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# vim: et ts=2 sw=2 ft=sh:
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