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initial commit with some functions, is not supposed to work yet, we need to provide some kind of configuration file and a sane way to procedurally read it

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Von Random 2014-12-08 00:11:17 +03:00
commit 69d393b53f
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#!/usr/bin/env zsh
# Default config file
default_cfg='/usr/local/etc/backup.cfg'
# Default date postfix
default_postfix=$(date +%F-%H%M)
function err
{
[[ -n $2 ]] && echo $2 >&2
return $1
}
function default_ports
{
if [[ -z $port_remote ]]; then
case $protocol in
('ftp') remote_port='21';;
('sftp'|'ssh') remote_port='22';;
(*) err 1 "$protocol is not a valid value for the protocol option.";;
esac
fi
}
function generate_fullpath
{
src_basename=${src_fullpath:t}
src_basedir=${src_fullpath:h}
if [[ -s $snap_file ]]; then
backup_type='incr'
else
backup_type='full'
fi
if [[ -z $backup_directory && $protocol != 'ssh' ]]; then
err 1 "You have not set the backup directory path."
elif [[ -z $backup_filename ]]; then
outfile="$backup_directory/$host_local\-$src_basename\_$postfix\_$backup_type.t${compress_format:-ar}"
else
outfile=$backup_filename
fi
}
function compress # compress to stdout
{
case $compress_format in
('xz') compress_flag='J' ;;
('bz2') compress_flag='j' ;;
('gz') compress_flag='z' ;;
('') unset compress_flag; unset compress_format ;;
(*) err 1 "$compress_format is not a valid value for the compression format option.";;
esac
if [[ -n $exclude_list ]]; then
if [[ -r $exclude_list ]]; then
exclude_option='-X'
else
err 1 "Exclusion list $exclude_list is either unreadable or does not exist."
fi
fi
if [[ -n $snap_file && -n $incremental_backup ]]; then
if printf '' >> $snap_file; then
snapshot_option='-g'
else
err 1 "Snapshot file $snap_file cannot be written."
fi
fi
tar cf$compress_flag - -C $src_basedir $src_basename $snapshot_option $snapshot_file $exclude_option $exclude_list --ignore-failed-read
}
function encrypt # encrypt if encryption is needed
{
if [[ -n $gnupg_key ]]; then
gpg -r $gnupg_key -e -
else
read _
print $_
fi
}
function store # store to local or remote
{
case $protocol in
('local') dd of=$outfile ;;
('ssh') ssh -p$port_remote $user_remote@$host_remote "dd of=$outfile" ;;
('sftp'|'ftp'|'ftps') curl -ksS -T - $protocol://$host_remote:$port_remote/$outfile -u $user_remote:$pass_remote ;;
(*) err 1 'Wrong protocol!' ;;
esac
}