TheOnePath
a2fcbb0512
Changed comments and preamble of script. 'backup_file' variable in 'restore_function' is now global to allow for removal of backup archive if the restoration was successful.
121 lines
7.0 KiB
Bash
Executable File
121 lines
7.0 KiB
Bash
Executable File
#!/bin/bash
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#########################################################################
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# common - Utility file with common functions for updater #
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# #
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# Dependencies: #
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# bash #
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# coreutils (>=8.32) #
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# tar #
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# #
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# #
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# Author: Ethan Smith-Coss #
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# Version: 0.1.4 #
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# Created: 2021-05-20T16:47+0100 #
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# Last Modified: 2021-06-22T16:57+0100 #
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# #
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# #################################### #
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# #
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# common - Utility file with common functions for updater #
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# Copyright ©️ 2021 Ethan Smith-Coss #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <http://www.gnu.org/licenses/>. #
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# #
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#########################################################################
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# logging function called to log information to a file.
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function log {
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local log_out=$(realpath "${0%/*}/.log.1")
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[[ $# -eq 0 ]] && log "ERROR" "Log function was called without any arguments. Returning 1." "$log_out" && return 1
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[[ ! $# -eq 3 ]] && log "ERROR" "Log function expected at least 3 arguments, recieved $#. Returning 1." "$log_out" && return 1
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$(echo "$(date -Iseconds) ($1): $2" >> "$3") >/dev/null 2>&1
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[[ ! $? -eq 0 ]] && log "ERROR" "Log function encountered an issue writing to \"$3\". Returning 1." "$log_out" && return 1
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return 0
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}
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# archive function used to create an archive compression of Microsoft Edge
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function archive_system {
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local log_out=$(realpath "${0%/*}/.log.1")
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[[ -e $1 ]] && log "ERROR" "Archive function was called without any arguments." "$log_out"
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local archive_output="/tmp/microsoft-edge-autoupdater/$(echo $1 | sed 's/\//_/').tar.gz"
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[[ -f "$archive_output" ]] && return 0
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## identify the files required for compressing
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usr_files="$(grep -E '^usr/.*beta.*$' "/tmp/microsoft-edge-autoupdater/Contents-amd64" | awk '{print "/" $1}')"
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opt_files="$(ls -1 "/opt/$1/" | sed -E "s/^(.*)$/\/opt\/"$(echo $1 | sed 's/\//\\\//')"\/\1/g")"
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### :@Ethan: we need to identify all the symlinked files and store them in a record. When we decompress we reinstate the symlinks.
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## This file is only stored temporarily and any symlinks will be removed from the identified files for compression.
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symlink_record="/tmp/microsoft-edge-autoupdater/symlink-record"
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ls -l $opt_files $usr_files | grep -Eo ':.*->.*$' | sed 's/\s->\s/:/g' | cut -d' ' -f2- > "$symlink_record"
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## remove identified symlink files from lists
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while read -r record ; do
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record=$(echo "$record" | cut -d: -f1)
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[[ "$record" =~ \/usr\/ ]] && record=$(echo $record | sed 's/\//\\\//g') && usr_files=$(echo "$usr_files" | sed "s/^"$record"$//") && continue
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[[ "$record" =~ \/opt\/ ]] && record=$(echo $record | sed 's/\//\\\//g') && opt_files=$(echo "$opt_files" | sed "s/^"$record"$//")
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done < <(cat $symlink_record)
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## use gzip compression to create the tarball archive
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tar --overwrite -czf "$archive_output" $opt_files $usr_files > "/tmp/microsoft-edge-autoupdater/tar_dump.log" 2>>"$log_out"
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exit_code=$?
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[[ ! $exit_code -eq 0 ]] && { log "ERROR" "(Archive) There was an issue creating the archive file of system. Returning...(10)" "$log_out" ; return 10 ; }
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return 0
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}
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# restoration function called at any point when the update fails during an installation process.
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function restore_files {
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local log_out=$(realpath "${0%/*}/.log.1")
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[[ -e $1 ]] && log "ERROR" "Restore function was called without any arguments." "$log_out"
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backup_file="/tmp/microsoft-edge-autoupdater/$1.tar.gz"
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[[ ! -f "$backup_file" ]] && { log "ERROR" "There is no backup of Microsoft Edge (Beta) identified. Restoration not possible." "$log_out" ; return 12 ; }
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## decompress the tarball archive using gzip and overwrite all files in the archive on the system
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tar --overwrite -xzf "$backup_file" -C "/" > "/tmp/microsoft-edge-autoupdater/tar_dump.log" 2>>"$log_out"
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exit_code=$?
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[[ ! $exit_code -eq 0 ]] && { log "ERROR" "There was an issue restoring pervious files to system." \
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"The backup created will not be removed to allow for manual restoration. Returning...(12)" ; return 12 ; }
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## recreate the symlinks
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log "DEBUG" "Re-establishing symlinks..." "$log_out"
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symlink_record="/tmp/microsoft-edge-autoupdater/symlink-record"
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while read -r record ; do
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symlink="$(echo $record | cut -d':' -f1)"
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symlink_to="$(echo $record | cut -d':' -f2)"
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### :NOTE: symlinks may already exist from new update and theoretically could be different in a newer version. Remove them first
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rm "$symlink"
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## create new sylinks based on the restored files
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ln -s "$symlink_to" "$symlink" >/dev/null 2>>"$log_out"
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exit_code=$?
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[[ ! $exit_code -eq 0 ]] && { log "ERROR" "There was an issue trying to create a symlink to "$symlink_to"" "$log_out" ; continue ; }
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log "DEBUG" "Successfully created symlink: "$symlink" -> "$symlink_to"" "$log_out"
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done < <(cat $symlink_record)
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log "DEBUG" "Symlinks re-established." "$log_out"
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return 0
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}
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# notification function used to send the user a notification via the dbus
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function notify {
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local log_out=$(realpath "${0%/*}/.log.1")
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[[ $# -eq 0 ]] && log "ERROR" "Notify function was called without any arguments. Returning 1." "$log_out" && return 1
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[[ ! $# -eq 2 ]] && log "ERROR" "Notify function expected at least 2 arguments, recieved $#. Returning 1." "$log_out" && return 1
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notify-send "$1" "$2" >>"$log_out" 2>&1 && tput bel
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exit_code=$?
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[[ ! $exit_code -eq 0 ]] && log "ERROR" "There was an issue send a notification to the system." "$log_out"
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return 0
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}
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