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10
genfstab
10
genfstab
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@ -11,7 +11,7 @@ root_uuid=$(blkid -s UUID -o value $root_device)
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swap_uuid=$(blkid -s UUID -o value $swap_device)
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# Generate fstab content
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cat << EOF > $1
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cat << EOF > $(file)
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# /etc/fstab: static file system information.
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#
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# Use 'blkid' to print the universally unique identifier for a
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@ -21,9 +21,7 @@ cat << EOF > $1
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# <file system> <mount point> <type> <options> <dump> <pass>
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UUID=$boot_uuid /boot/efi efi defaults,noatime,nodiratime 0 2
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UUID=$root_uuid / ext4 defaults,noatime,nodiratime 0 1
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UUID=$swap_uuid swap swap defaults 0 0
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tmpfs /tmp tmpfs defaults,nosuid,nodev,nodiratime 0 0
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UUID=$root_uuid / ext4 defaults,noatime,nodiratime 0 1
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UUID=$swap_uuid swap swap defaults 0 0
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tmpfs /tmp tmpfs defaults,nosuid,nodev,nodiratime 0 0
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EOF
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echo "fstab file generated successfully."
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176
gfstab
176
gfstab
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@ -1,176 +0,0 @@
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#!/bin/sh
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# fstab generator similar in function to the Arch Linux tool that can be found
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# on arch-install-scripts.
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#
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# Copyright (C) 2020 Cem Keylan <cem@ckyln.com>
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out() { printf '%s\n' "$@" ;}
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die() { out "$@" >&2; exit 1 ;}
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find_tag() {
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# Function to find the tag of the given device. This eliminates the
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# requirement for programs such as lsblk/blkid.
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#
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# usage: find_tag /dev/sdx1
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# If no identifiers are given, return with the plain partition name.
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[ "$ident" ] || { out "$1"; return 0 ;}
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[ -d "${tagdir:=/dev/disk/by-$(printf %s "$ident" | tr '[:upper:]' '[:lower:]')}" ] ||
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die "Directory '$dir' doesn't exist"
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for file in "$tagdir/"*; do
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[ "$(_readlinkf "$file")" = "$1" ] || continue
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tag="$ident=${file##*/}"
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break
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done
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# If the tag couldn't be found for some reason, fallback to the default
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# name instead of printing empty.
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out "${tag:-$1}"
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}
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print_mnt() {
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# Print fstab entry
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printf '%-23s %-15s %-15s %-15s %s %s\n\n' "$@"
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}
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_readlinkf() {
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# https://github.com/ko1nksm/readlinkf
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[ "${1:-}" ] || return 1
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max_symlinks=40
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CDPATH='' # to avoid changing to an unexpected directory
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target=$1
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[ -e "${target%/}" ] || target=${1%"${1##*[!/]}"} # trim trailing slashes
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[ -d "${target:-/}" ] && target="$target/"
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cd -P . 2>/dev/null || return 1
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while [ "$max_symlinks" -ge 0 ] && max_symlinks=$((max_symlinks - 1)); do
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if [ ! "$target" = "${target%/*}" ]; then
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case $target in
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/*) cd -P "${target%/*}/" 2>/dev/null || break ;;
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*) cd -P "./${target%/*}" 2>/dev/null || break ;;
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esac
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target=${target##*/}
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fi
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if [ ! -L "$target" ]; then
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target="${PWD%/}${target:+/}${target}"
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printf '%s\n' "${target:-/}"
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return 0
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fi
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# `ls -dl` format: "%s %u %s %s %u %s %s -> %s\n",
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# <file mode>, <number of links>, <owner name>, <group name>,
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# <size>, <date and time>, <pathname of link>, <contents of link>
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# https://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html
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link=$(ls -dl -- "$target" 2>/dev/null) || break
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target=${link#*" $target -> "}
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done
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return 1
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}
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ispseudo() {
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# This function checks for pseudo-filesystems and returns 0 if it is.
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# There is no definitive way to know every single pseudo-filesystems,
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# there might be some issues with this function.
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#
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# If the filesystem is not a directory or a tag, we will assume that
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# it is a pseudofs. The only exception I have noticed so far are loop
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# devices.
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case "$fs" in /dev/loop*) return 0 ;; /*|*=*) ;; *) return 0; esac
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# These are the most common types of pseudo filesystems.
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case "$type" in squashfs|proc|sysfs|tmpfs|devtmpfs|devpts|debugfs) return 0; esac
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# As for the last check, we will look up /proc/filesystems which are
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# filesystems known by the running kernel.
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while read -r ps filesystem; do
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[ "$filesystem" = "$type" ] || continue
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[ "$ps" ] && return 0
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return 1
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done < /proc/filesystems
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# If we still haven't come up with an answer, let's assume that this is NOT
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# a pseudo-filesystem.
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return 1
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}
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usage() {
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out "usage: ${0##*/} [-f filter] [-t tag] [-LpPU] [root]" "" \
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" Options:" \
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" -f <filter> Restrict output to mountpoints matching the prefix FILTER" \
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" -L Use labels for source identifiers (Shortcut for -t LABEL)" \
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" -p Exclude pseudofs mounts (default behaviour)" \
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" -P Include pseudofs mounts" \
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" -t <tag> Use tag for source identifiers (should be one of: LABEL," \
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" UUID, PARTLABEL, PARTUUID)" \
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" -U Use UUIDs for source identifiers (Shortcut for -t UUID)" "" \
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" -h Print this help message" "" \
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"${0##*/} 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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"This implementation of genfstab is from <https://git.ckyln.com/genfstab>"
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exit "${1:-0}"
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}
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# Print help information
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case " $* " in *' --help '*|*' -h '*) usage; esac
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ident='' filter='' pseudo=0
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while getopts hPpLUf:t: flag; do
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case $flag in
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h) usage ;;
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P) pseudo=1 ;;
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p) pseudo=0 ;;
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L) ident=LABEL ;;
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U) ident=UUID ;;
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f) [ -d "$OPTARG" ] || die "Not a directory '$OPTARG'"
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filter=$(_readlinkf "$OPTARG") ;;
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t) case "$OPTARG" in
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LABEL|UUID|PARTLABEL|PARTUUID) ident=$OPTARG ;;
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*) die "Unknown identifier '$OPTARG'"; esac
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;;
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?) usage 1
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esac
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done
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shift $((OPTIND - 1))
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[ "$1" ] && {
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[ -d "$1" ] || die "Not a directory '$1'"
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root="$(_readlinkf "$1")"
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}
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# It's a good thing that /proc/mounts and fstab share the same syntax. We will
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# always be defining dump and pass ourselves since they will always be '0 0' on
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# /proc/mounts.
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while read -r fs dir type options _; do
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if ispseudo; then
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pass=0
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[ "$pseudo" != 1 ] && continue
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[ "$ident" ] && out "# $fs"
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else
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case "$dir" in "${root:-/}"*) ;; *) continue; esac
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[ "$ident" ] && out "# $fs"
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fs="$(find_tag "$fs")"
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[ "$root" ] && dir=/${dir#$root}
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case "$dir" in /) pass=1 ;; *) pass=2; esac
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fi
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[ "$filter" ] && case "$dir" in ${filter%/}*) ;; *) continue; esac
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print_mnt "$fs" "${dir:-/}" "$type" "$options" "${dump:=0}" "$pass"
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done < /proc/mounts
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# Now print out mounted swaps. I am really not quite sure how swaps work as I
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# don't personally use them. If you have a better approach to this, please let
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# me know.
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while read -r file _; do
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[ -f "/$file" ] || continue
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[ "$root" ] && {
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case "$file" in "$root/"*) ;; *) continue; esac
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file=/${file#$root}
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}
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print_mnt "$file" none swap sw 0 0
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done < /proc/swaps
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