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197 lines
6.7 KiB
Groff
197 lines
6.7 KiB
Groff
.\" Man page generated from reStructuredText.
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.TH "SYNCTHING-VERSIONING" "7" "October 05, 2016" "v0.14" "Syncthing"
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.SH NAME
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syncthing-versioning \- Keep automatic backups of deleted files by other nodes
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..
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.SH DESCRIPTION
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.sp
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Syncthing supports archiving the old version of a file when it is deleted or
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replaced with a newer version from the cluster. This is called "file
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versioning" and uses one of the available \fIversioning strategies\fP described
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below. File versioning is configured per folder and defaults to "no file
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versioning", i.e. no old copies of files are kept.
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.SH TRASH CAN FILE VERSIONING
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.sp
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This versioning strategy emulates the common "trash can" approach. When a file
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is deleted or replaced due to a change on a remote device, it is a moved to
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the trash can in the \fB\&.stversions\fP folder. If a file with the same name was
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already in the trash can it is replaced.
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.sp
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A configuration option is available to clean the trash can from files older
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than a specified number of days. If this is set to a positive number of days,
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files will be removed when they have been in the trash can that long. Setting
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this to zero prevents any files from being removed from the trash can
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automatically.
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.SH SIMPLE FILE VERSIONING
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.sp
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With "Simple File Versioning" files are moved to the \fB\&.stversions\fP folder
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(inside your shared folder) when replaced or deleted on a remote device. This
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option also takes a value in an input titled "Keep Versions" which tells
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Syncthing how many old versions of the file it should keep. For example, if
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you set this value to 5, if a file is replaced 5 times on a remote device, you
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will see 5 time\-stamped versions on that file in the ".stversions" folder on
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the other devices sharing the same folder.
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.SH STAGGERED FILE VERSIONING
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.sp
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With "Staggered File Versioning" files are also moved to a different folder
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when replaced or deleted on a remote device (just like "Simple File
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Versioning"), however, versions are automatically deleted if they are older
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than the maximum age or exceed the number of files allowed in an interval.
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.sp
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With this versioning method it\(aqs possible to specify where the versions are
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stored, with the default being the \fB\&.stversions\fP folder inside the normal
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folder path. If you set a custom version path, please ensure that it\(aqs on the
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same partition or filesystem as the regular folder path, as moving files there
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may otherwise fail. You can use an absolute path (this is recommended) or a
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relative path. Relative paths are interpreted relative to Syncthing\(aqs current
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or startup directory.
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.sp
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The following intervals are used and they each have a maximum number of files
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that will be kept for each.
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.INDENT 0.0
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.TP
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.B 1 Hour
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For the first hour, the most recent version is kept every 30 seconds.
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.TP
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.B 1 Day
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For the first day, the most recent version is kept every hour.
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.TP
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.B 30 Days
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For the first 30 days, the most recent version is kept every day.
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.TP
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.B Until Maximum Age
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Until maximum age, the most recent version is kept every week.
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.TP
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.B Maximum Age
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The maximum time to keep a version in days. For example, to keep replaced or
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deleted files in the ".stversions" folder for an entire year, use 365. If
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only for 10 days, use 10. \fBNote: Set to 0 to keep versions forever.\fP
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.UNINDENT
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.SH EXTERNAL FILE VERSIONING
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.sp
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This versioning method delegates the decision on what to do to an external
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command (program or script). The only configuration option is the name of the
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command. This should be an absolute path name. Just prior to a file being
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replaced, the command will be run with two parameters: the path to the folder,
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and the path to the file within the folder.
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.SS Example for Unixes
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.sp
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Lets say I want to keep the latest version of each file as they are replaced
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or removed; essentially I want a "trash can"\-like behavior. For this, I create
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the following script and store it as \fB/Users/jb/bin/onlylatest.sh\fP (i.e. the
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\fBbin\fP directory in my home directory):
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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#!/bin/sh
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set \-eu
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# Where I want my versions stored
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versionspath=~/.trashcan
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# The parameters we get from Syncthing
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folderpath="$1"
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filepath="$2"
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# First ensure the dir where we need to store the file exists
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outpath=\(gadirname "$versionspath/$filepath"\(ga
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mkdir \-p "$outpath"
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# Then move the file there
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mv \-f "$folderpath/$filepath" "$versionspath/$filepath"
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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I must ensure that the script has execute permissions (\fBchmod 755
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onlylatest.sh\fP), then configure Syncthing with the above path as the command
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name.
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.sp
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Lets assume I have a folder "default" in ~/Sync, and that within that folder
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there is a file \fBdocs/letter.txt\fP that is being replaced or deleted. The
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script will be called as if I ran this from the command line:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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$ /Users/jb/bin/onlylatest.sh /Users/jb/Sync docs/letter.txt
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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The script will then move the file in question to
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\fB~/.trashcan/docs/letter.txt\fP, replacing any previous version of that letter
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that may already have been there.
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.SS Example for Windows
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.sp
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On Windows we can use a batch script to perform the same "trash can"\-like
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behavior as mentioned above. I created the following script and saved it as
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\fBC:\eUsers\emfrnd\eScripts\eonlylatest.bat\fP\&.
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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@echo off
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:: We need command extensions for mkdir to create intermediate folders in one go
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setlocal EnableExtensions
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:: Where I want my versions stored
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set VERSIONS_PATH=%USERPROFILE%\e.trashcan
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:: The parameters we get from Syncthing, \(aq~\(aq removes quotes if any
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set FOLDER_PATH=%~1
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set FILE_PATH=%~2
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:: First ensure the dir where we need to store the file exists
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for %%F in ("%VERSIONS_PATH%\e%FILE_PATH%") do set OUTPUT_PATH=%%~dpF
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if not exist "%OUTPUT_PATH%" mkdir "%OUTPUT_PATH%" || exit /B
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:: Finally move the file, overwrite existing file if any
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move /Y "%FOLDER_PATH%\e%FILE_PATH%" "%VERSIONS_PATH%\e%FILE_PATH%"
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.sp
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Finally, I set \fBC:\eUsers\emfrnd\eScripts\eonlylatest.bat\fP as command name in
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Syncthing.
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.SH AUTHOR
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The Syncthing Authors
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.SH COPYRIGHT
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2015, The Syncthing Authors
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.\" Generated by docutils manpage writer.
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