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author | Einhard Leichtfuß <alguien@respiranto.de> | 2019-10-18 00:28:00 +0200 |
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committer | Einhard Leichtfuß <alguien@respiranto.de> | 2019-10-18 01:17:39 +0200 |
commit | 4e2ceb9875c81c33b09f6eaf0858b7f9591b22cc (patch) | |
tree | be3860dc8c26b3c18a30c2a81b58e00025b98069 /local | |
parent | 51f58d7c4c984ec8ccc5ab0a3d31d04cd39d499c (diff) |
A notable problem (to me) with the former version was, that upon simple
movements in the source file tree, these would in general cause
duplicated data in the backup forest. This problem has been resolved
by essentially tracking file movements, using hard links.
Also, the code has been divided into several different files, extranous
code removed, the organization of remote code execution simplified.
In the process of simplification, all parts requiring direct interaction
of the user with the program have been replaced. In most cases, this
means that the program now just terminates with an error instead of
allowing the user to confirm deletion of an unexpected (remnant) file.
This may be considered a drawback, but actually these interactive
options were anyways suboptimal solutions in most cases - where they
occured, which was due to remnant files of aborted or failed former
backups.
In general, there have been a lot of changes. Which are not thoroughly
documented here. Since there is often no strong relation to the old
code, this is not deemed necessary, as the in-code documentation is
expected to be of sufficient help.
Also, there has been added a little general documentation in the README
and particularly the NOTES file.
It is to be noted that this new version is far from sophisticated. It
has been tested with and is in use for real data, however lacks a lot of
convenience. In particular, if a backup fails unexpectedly, the next
backup will in the very most cases loudly fail without manual
intervention. Also, the program is not able to continue the growth of a
backup tree built with former versions of this program, by itself. This
can however be arranged by hand.
Diffstat (limited to 'local')
-rw-r--r-- | local | 123 |
1 files changed, 123 insertions, 0 deletions
@@ -0,0 +1,123 @@ +#!/usr/bin/env bash +# +# local - functions acting on the local host. +# +# Copyright 2015 - 2019 Einhard Leichtfuß +# +# This file is part of rsync-backup. +# +# rsync-backup is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published +# by the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# rsync-backup is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with rsync-backup. If not, see <https://www.gnu.org/licenses/>. +# + + +function main +{ + local src_old_date + local src_new_date + local src_mirrors_path + + shopt -s $SHOPTS + + # Set $src, $dest_path and $filter_args. + get_args "$@" || return $? + + shopt -s $SHOPTS_AFTER_GET_ARGS + + run_function "$src_host" src_prepare \ + 'assert_is_dir create_dir replace_symlink' \ + 'src_path src_mirror_reldir RSYNC rsync_args[@] filter_args[@] DATEFMT' \ + || return $? + + src_mirrors_path="${src_path}/${src_mirror_reldir}" + src_old_date="$( + run_command "$src_host" readlink "${src_mirrors_path}/old")" + src_new_date="$( + run_command "$src_host" readlink "${src_mirrors_path}/new")" + + if [[ "$src_old_date" == 'none' ]] + then + run_function "$dest_host" dest_prepare_initial 'create_new_dir' '' \ + || return $? + + transfer_initial_backup "$src_new_date" || return $? + else + run_function "$dest_host" dest_prepare_incremental \ + 'assert_is_dir dest_list_backup_dirs create_new_dir' 'dest_path' \ + "$src_old_date" "$src_new_date" \ + || return $? + + transfer_incremental_backup "$src_old_date" "$src_new_date" || return $? + fi + + run_function "$dest_host" dest_finalize \ + 'dest_refresh_symlinks + assert_is_dir dest_list_backup_dirs replace_symlink_target + create_dir' \ + 'dest_path' \ + "$src_old_date" "$src_new_date" \ + || return $? + + return $RET_SUCCESS +} + + +# Transfer the very first backup from source to destination. To be run after +# src_prepare and dest_prepare. +# +# $1: date of the backup: date in $DATEFMT +# +function transfer_initial_backup +{ + local date="$1" + + message "Transfer new (initial) backup..." + + "$RSYNC" "${rsync_args[@]}" \ + "${src}/${src_mirror_reldir}/${date}" \ + "${dest}/work" \ + || return $RET_ERROR + + message "Finished transfer." + + return $RET_SUCCESS +} + + +# Transfer new backup from source to destination. To be run after +# src_prepare and dest_prepare. +# +# $1: old date: date in $DATEFMT +# $2: new date: date in $DATEFMT +# +function transfer_incremental_backup +{ + local old_date="$1" + local new_date="$2" + + message "Transfer new (incremental) backup..." + + # Note: Use --link-dest instead of making the old backup part of the target + # directory, since src/old_date may have changed due to in-place + # modifications. + "$RSYNC" "${rsync_args[@]}" --link-dest='..' \ + "${src}/${src_mirror_reldir}"/{"$old_date","$new_date"} \ + "${dest}/work" \ + || return $RET_ERROR + + message "Finished transfer." + + return $RET_SUCCESS +} + +# vi: ft=bash ts=2 sw=2 noet |