Backup push
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Dennis ten Hoove
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155
bttrfs-deploy
Executable file
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bttrfs-deploy
Executable file
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#!/usr/bin/env bash
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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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# Print manual if no parameters provided or invalid amount of parameters is provided
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if [[ ! -n $1 || -n $2 ]]; then
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cat <<- END
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Usage: bttrfs-deploy [action]
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Actions:
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update Update existing deployments
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init Initialize bttrfs on a new system
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teardown Remove all bttrfs-deploy related files and folders
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END
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exit 0
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fi
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## Set common variables
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#
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declare -r bttrfs_dir='/bttrfs/'
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declare -r bttrfs_deployment_dir="$bttrfs_dir/deployments"
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## Common functions
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#
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# Cleanup and quit if error
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cleanup_and_quit () {
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# If any paramters are passed we will assume it to be an error
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[[ -n $1 ]] && printf "\e[1;31m<#>\e[0m $*\e[0m\n" >&2
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# Remove temporary btrfs volumes
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# ONLY IF CUSTOM DEFINED?
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#[[ ! -n $BTTRFS_NO_CLEANUP || ! -n $subvol_created ]] &&
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# btrfs subvolume delete $workdir 2> /dev/null
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# Quit program if argument provided to function
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[[ -n $1 ]] && exit 1
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# Otherwise just quit, there is no error
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exit 0
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}
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## Error checking
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#
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# Quit if not root
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[[ ! $EUID -eq 0 ]] &&
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printf '\e[1;31m<#>\e[0m\e[1m This program has to be run as root\n\e[0m' &&
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exit 1
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# Check if all dependencies are installed, quit if not
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for prog in btrfs; do
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if ! command -v $prog > /dev/null; then
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printf "\e[1;31m<#>\e[0m\e[1m Failed to locate $prog, ensure it is installed\e[0m\n"
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exit 1
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fi
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done
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## Core functions
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#
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# Initialize the system for bttrfs
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init () {
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printf '\e[1;34m-->\e[0m\e[1m Initializing bttrfs\e[0m\n'
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[[ -d $bttrfs_dir ]] && cleanup_and_quit "$bttrfs_dir already exists"
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# Create the /bttrfs subvolume
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printf "\e[1;34m-->\e[0m\e[1m Creating $(readlink -m $bttrfs_dir) subvolume\e[0m\n"
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btrfs subvolume create $bttrfs_dir || cleanup_and_quit "Failed to create btrfs subvolume $(readlink -m $bttrfs_dir)"
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# Create directory structure
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printf "\e[1;34m-->\e[0m\e[1m Creating directory structure\e[0m\n"
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mkdir -pv $bttrfs_dir/deployments \
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$bttrfs_dir/deployments/primary_a \
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$bttrfs_dir/deployments/primary_b \
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$bttrfs_dir/shared ||
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cleanup_and_quit "Failed to create /bttrfs and related directories"
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# Write default config file
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printf "\e[1;34m-->\e[0m\e[1m Adding default config file\e[0m\n"
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cat <<- END > $bttrfs_dir/config
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# Primary filesystem operating system
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primary_os='arkanelinux'
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# Do not copy custom root filesystem to new deployments
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custom_rootfs=0
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# Do not install additional packages defined customize
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custom_packages=0
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END
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exit 0
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}
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teardown () {
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cat <<- END
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WARNING: Removing bttrfs may leave your system in an unbootable state and you
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may have to manually reconfigure your bootloader etc.. Only proceed if you know
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what you are doing!
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The following changes will be made to your system;
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- All subvolumes under $bttrfs_dir will be deleted
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END
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read -p 'Type "I KNOW WHAT I AM GOING" in uppercase to confirm that you know what you are doing: ' input_confirm
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if [[ $input_confirm == 'I KNOW WHAT I AM DOING' ]]; then
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printf '\e[1;34m-->\e[0m\e[1m Tearing down bttrfs\e[0m\n'
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# Quit with error if $bttrfs_dir does not exist
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if [[ ! -d $bttrfs_dir ]]; then
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printf "\e[1;31m<#>\e[0m $(readlink -m $bttrfs_dir) does not exist, there is nothing to tear down"
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exit 1
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fi
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# Remove all nested subvolumes in $bttrfs_dir
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for volume in $(btrfs subvolume list $bttrfs_dir | grep -oE '[^ ]+$'); do
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btrfs property set -f -ts $(readlink -m $bttrfs_dir/$volume) ro false
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btrfs subvolume delete $(readlink -m $bttrfs_dir/$volume)
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done
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# Remove $bttrfs_dir itself
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btrfs property set -f -ts $(readlink -m $bttrfs_dir) ro false
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btrfs subvolume delete $(readlink -m $bttrfs_dir)
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else
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printf '\e[1;34m-->\e[0m\e[1m Teardown canceled, no changes made to system\e[0m\n'
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fi
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exit 0
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}
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# Check for updates and apply
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update_deployments () {
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# Check os-name/version, if higher pull and deploy
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asd
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}
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# Check if A or B root fs is currently active
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check_currently_active_rootfs () {
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asd
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}
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# If $1 is init run init
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[[ $1 == 'init' ]] && init
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[[ $1 == 'teardown' ]] && teardown
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