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#!/usr/bin/env zsh
self_name=$0
default_cfg='/usr/local/etc/backup.cfg'
default_postfix=$(date +%F-%H%M)
default_ftp_port='21'
default_ssh_port='22'
function err
{
[[ -n $1 ]] && echo $1 >&2
}
function cfg_err
{
[[ -n $1 ]] && echo "$1 is not set in configuration, but is required by $0 to work." >&2
}
function usage
{
echo "usage: $self_name [--help|--config]
--help -h - show this message
--config -c - use config from the specified path
Default config path /usr/local/etc/backup.cfg will be used if invoked without options"
}
# function to read the configuration file and spit out some exceptions if stuff is missing
function apply_config
{
source $cfg || err 15 'Config file does not exist'
if [[ -z $source_dirs ]]; then
cfg_err 'Backup source'
exit 5
fi
if [[ -z $remote_host ]]; then
cfg_err 'Remote host'
exit 5
fi
if [[ -z $backup_dir && $protocol != 'ssh' ]]; then
cfg_err 'Target directory'
exit 5
fi
if [[ -z $local_host ]]; then
local_host=$HOST
fi
# date postfix
if [[ -z $outfile_postfix ]]; then
postfix=$default_postfix
else
postfix=$outfile_postfix
fi
case $protocol in
('ftp'|'ftps') port=${remote_port:-$default_ftp_port};;
('sftp'|'ssh') port=${remote_port:-$default_ssh_port};;
('local') unset remote_port;;
(*) cfg_err 'Backup protocol'; exit 5;;
esac
if [[ ! $remote_port =~ ^[0-9]+$ ]]; then
err 'Remote port is not a numeric value.'
fi
case $compress_format in
('xz') compress_flag='J' ;;
('bz2') compress_flag='j' ;;
('gz') compress_flag='z' ;;
('') unset compress_flag; unset compress_format ;;
(*) err "$compress_format is not a valid value for the compression format option."; exit 5;;
esac
if [[ -n $exclude_list ]]; then
if [[ -r $exclude_list ]]; then
exclude_option='-X'
else
err "Exclusion list $exclude_list is either unreadable or does not exist."
fi
fi
if [[ -n $snap_file ]]; then
if printf '' >> $snap_file; then
snapshot_option='-g'
else
err "Snapshot file $snap_file cannot be written."
fi
fi
}
# generate the full backup path
function generate_fullpath
{
local backup_type
# increment or full backup
if [[ -s $snap_file ]]; then
backup_type='incr'
else
backup_type='full'
fi
if [[ -z $backup_filename ]]; then
outfile="$backup_dir/${local_host}-${src_basename}_${postfix}_${backup_type}.t${compress_format:-'ar'}"
else
outfile=$backup_filename
fi
}
function compress # compress to stdout
{
tar cf$compress_flag - -C $src_basedir $src_basename $snapshot_option $snapshot_file $exclude_option $exclude_list --ignore-failed-read
}
function store # store to local or remote
{
case $protocol in
('local') dd of=$outfile ;;
('ssh') ssh -p$port $remote_user@$remote_host "dd of=$outfile" ;;
('sftp'|'ftp'|'ftps') curl -ksS -T - $protocol://$remote_host:$port/$outfile -u $remote_user:$remote_pass ;;
esac
}
function parse_opts
{
while [[ -n $1 ]]; do
case $1 in
('--help'|'-h') usage; return 0;;
('--config'|'-c') shift; opt_cfg=$1; shift;;
esac
done
}
function main
{
parse_opts
if [[ -z $opt_cfg ]]; then
cfg=$default_cfg
else
cfg=$opt_cfg
fi
apply_config
for i in $source_dirs; do
unset src_basename src_basedir outfile
IFS=':' read source_dir snap_file <<< $i
src_basename=${source_dir:t}
src_basedir=${source_dir:h}
generate_fullpath
compress | store
done
return 0
}
main $@
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