some refactoring + support for multiple directories with and without incremental backups
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2 changed files with 62 additions and 49 deletions
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@ -1,5 +1,4 @@
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protocol=ssh # ftp, sftp, ftps, ssh or local
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source_dir=/home/user/source
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remote_host=hostname.tld
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backup_dir=relative_or_full_path
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#snap_file=/var/backup/snapshot.list
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@ -7,3 +6,6 @@ backup_dir=relative_or_full_path
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compress_format=xz # gz, bz2, xz or empty for non-compressed
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remote_user=username
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remote_pass=PassWd
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source_dirs=( '/home/user/source1:/var/backup/snapshot.list' )
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# vim: ft=zsh
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107
backup.zsh
107
backup.zsh
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@ -1,17 +1,16 @@
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#!/usr/bin/env zsh
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set -e
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self_name=$0
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default_cfg='/usr/local/etc/backup.cfg'
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default_postfix=$(date +%F-%H%M)
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function err
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{
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[[ -n $2 ]] && echo $2 >&2
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return $1
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[[ -n $1 ]] && echo $1 >&2
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}
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function cfg_err
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{
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[[ -n $1 ]] && echo "$1 is not set in configuration, but is required by $0 to work." >&2
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return 5
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}
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function usage
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@ -19,50 +18,35 @@ function usage
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echo "usage: $self_name [--help|--config]
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--help -h - show this message
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--config -c - use config from the specified path
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Default config path /usr/local/etc/backup.cfg will be used if invoked without options"
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}
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function read_config
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# function to read the configuration file and spit out some exceptions if stuff is missing
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function apply_config
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{
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source $cfg || err 15 'Config file does not exist'
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[[ -z $source_dir ]] && cfg_err 'Backup source'
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[[ -z $remote_host ]] && cfg_err 'Remote host'
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[[ -z $protocol ]] && cfg_err 'Backup protocol'
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[[ -z $backup_dir && $protocol != 'ssh' ]] && cfg_err 'Target directory'
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[[ -z $source_dirs ]] && { cfg_err 'Backup source'; exit 5 }
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[[ -z $remote_host ]] && { cfg_err 'Remote host'; exit 5 }
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[[ -z $protocol ]] && { cfg_err 'Backup protocol'; exit 5 }
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[[ -z $backup_dir && $protocol != 'ssh' ]] && { cfg_err 'Target directory'; exit 5 }
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if [[ -z $local_host ]]; then
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local_host=$HOST
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fi
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src_basename=${source_dir:t}
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src_basedir=${source_dir:h}
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}
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function generate_fullpath
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{
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local backup_type
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local postfix
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# date postfix
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if [[ -z $outfile_postfix ]]; then
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postfix=$default_postfix
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else
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postfix=$outfile_postfix
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fi
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if [[ -s $snap_file ]]; then
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backup_type='incr'
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else
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backup_type='full'
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if [[ -z $remote_port ]]; then
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case $protocol in
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('ftp'|'ftps') remote_port='21';;
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('sftp'|'ssh') remote_port='22';;
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('local') unset remote_port;;
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(*) err 1 "$protocol is not a valid value for the protocol option.";;
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esac
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fi
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if [[ -z $backup_filename ]]; then
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outfile="$backup_dir/${local_host}-${src_basename}_${postfix}_${backup_type}.t${compress_format:-'ar'}"
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else
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outfile=$backup_filename
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fi
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}
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function compress # compress to stdout
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{
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local compress_flag
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local exclude_option
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local snapshot_option
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case $compress_format in
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('xz') compress_flag='J' ;;
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('bz2') compress_flag='j' ;;
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@ -84,19 +68,32 @@ function compress # compress to stdout
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err 1 "Snapshot file $snap_file cannot be written."
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fi
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fi
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}
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# generate the full backup path
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function generate_fullpath
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{
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local backup_type
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# increment or full backup
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if [[ -s $snap_file ]]; then
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backup_type='incr'
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else
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backup_type='full'
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fi
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if [[ -z $backup_filename ]]; then
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outfile="$backup_dir/${local_host}-${src_basename}_${postfix}_${backup_type}.t${compress_format:-'ar'}"
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else
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outfile=$backup_filename
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fi
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}
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function compress # compress to stdout
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{
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tar cf$compress_flag - -C $src_basedir $src_basename $snapshot_option $snapshot_file $exclude_option $exclude_list --ignore-failed-read
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}
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function store # store to local or remote
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{
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if [[ -z $remote_port ]]; then
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case $protocol in
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('ftp'|'ftps') remote_port='21';;
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('sftp'|'ssh') remote_port='22';;
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('local') unset remote_port;;
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(*) err 1 "$protocol is not a valid value for the protocol option.";;
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esac
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fi
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case $protocol in
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('local') dd of=$outfile ;;
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('ssh') ssh -p$remote_port $remote_user@$remote_host "dd of=$outfile" ;;
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@ -105,7 +102,7 @@ function store # store to local or remote
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esac
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}
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function main
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function parse_opts
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{
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while [[ -n $1 ]]; do
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case $1 in
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@ -113,11 +110,25 @@ function main
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('--config'|'-c') shift; opt_cfg=$1; shift;;
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esac
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done
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cfg=${opt_cfg:-'/usr/local/etc/backup.cfg'}
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default_postfix=$(date +%F-%H%M)
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read_config
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generate_fullpath
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compress | store
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}
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function main
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{
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parse_opts
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if [[ -z $opt_cfg ]]; then
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cfg=$default_cfg
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else
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cfg=$opt_cfg
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fi
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apply_config
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for i in $source_dirs; do
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unset src_basename src_basedir outfile
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IFS=':' read source_dir snap_file <<< $i
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src_basename=${source_dir:t}
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src_basedir=${source_dir:h}
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generate_fullpath
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compress | store
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done
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return 0
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}
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