Unison
Free App
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About Unison
Native Android binaries of the Unison File Synchronizer - a powerful cross-platform file synchronization tool.
This app only deploys the Android binaries of Unison, Dropbear SSH and OpenSSH; and displays a quick howto.
Unison must be used manually from the command line, and root is required.
(For an Android GUI for Unison, check UnisonSync on GooglePlay.)
BACKGROUND
Unison is a powerful cross-platform file synchronization tool available on Linux, OS X, Windows, etc. Unison takes two roots, that can be on different machines and can be modified separately, and brings them up to date by smartly propagating the changes between the roots.
The key features of Unison are:
- Synchronization between different platforms
- Handles simultaneous updates to both roots
- Smart and safe: Unison resolves most simultaneous changes on both roots automatically, and prompts the user for input if it cannot determine the copy to propagate
- Synchronization to a server over SSH: any machine with an SSH server and Unison can act as server
- Resilient: handles interruptions, network disconnections, etc.
- Bandwidth efficient: the data is transfered by a compressed protocol similar to rsync, and only modified files (or parts of files) are transferred.
REMARK ON OPEN-SOURCE LICENSES
This application comprises binaries of Unison, DropbearSSH and OpenSSH, compiled from the existing open-source repositories (see acknowledgements). Binaries are packaged alongside this application APK, but the application does not actually link against these unmodified apps.
Therefore this application does not violate the GPL/MIT/BSD licenses.
ACKNOWLEDGEMENTS
- Benjamin Pierce et al.'s Unison File Synchronizer (http://www.cis.upenn.edu/~bcpierce/unison)
- Keigo Imai's patch to to cross-compile OCaml on Android (http://sites.google.com/site/keigoattic/ocaml-on-android)
- Jérôme Vouillon's OPAM Android repository (http://github.com/vouillon/opam-android-repository)
- Matt Johnston's Dropbear SSH client (http://matt.ucc.asn.au/dropbear/dropbear.html)
This app only deploys the Android binaries of Unison, Dropbear SSH and OpenSSH; and displays a quick howto.
Unison must be used manually from the command line, and root is required.
(For an Android GUI for Unison, check UnisonSync on GooglePlay.)
BACKGROUND
Unison is a powerful cross-platform file synchronization tool available on Linux, OS X, Windows, etc. Unison takes two roots, that can be on different machines and can be modified separately, and brings them up to date by smartly propagating the changes between the roots.
The key features of Unison are:
- Synchronization between different platforms
- Handles simultaneous updates to both roots
- Smart and safe: Unison resolves most simultaneous changes on both roots automatically, and prompts the user for input if it cannot determine the copy to propagate
- Synchronization to a server over SSH: any machine with an SSH server and Unison can act as server
- Resilient: handles interruptions, network disconnections, etc.
- Bandwidth efficient: the data is transfered by a compressed protocol similar to rsync, and only modified files (or parts of files) are transferred.
REMARK ON OPEN-SOURCE LICENSES
This application comprises binaries of Unison, DropbearSSH and OpenSSH, compiled from the existing open-source repositories (see acknowledgements). Binaries are packaged alongside this application APK, but the application does not actually link against these unmodified apps.
Therefore this application does not violate the GPL/MIT/BSD licenses.
ACKNOWLEDGEMENTS
- Benjamin Pierce et al.'s Unison File Synchronizer (http://www.cis.upenn.edu/~bcpierce/unison)
- Keigo Imai's patch to to cross-compile OCaml on Android (http://sites.google.com/site/keigoattic/ocaml-on-android)
- Jérôme Vouillon's OPAM Android repository (http://github.com/vouillon/opam-android-repository)
- Matt Johnston's Dropbear SSH client (http://matt.ucc.asn.au/dropbear/dropbear.html)
All Application Badges
Free
downl.
downl.
Android
2.1+
2.1+
Bug
buster
buster
Android app
App History & Updates
What's Changed
- 15.05.2015: Clarified app purpose; added Play Store link to UnisonSync
- 10.05.2015: Added Unison 2.48.3
- 24.01.2015:
-- packaged Unison and OpenSSH as PIE (Position Independent Executable) for Android 5.0+ and non-PIE (for older versions of Android). The executables are postfixed with -pie or -nonpie accordingly.
(dropbear is not available as PIE currently)
- 21.10.2014:
-- Updated OpenSSH to version 6.7p1 and OpenSSL to 1.01j.
<...>
- 27.10.2013: first release (Unison 2.40.102)
- 15.05.2015: Clarified app purpose; added Play Store link to UnisonSync
- 10.05.2015: Added Unison 2.48.3
- 24.01.2015:
-- packaged Unison and OpenSSH as PIE (Position Independent Executable) for Android 5.0+ and non-PIE (for older versions of Android). The executables are postfixed with -pie or -nonpie accordingly.
(dropbear is not available as PIE currently)
- 21.10.2014:
-- Updated OpenSSH to version 6.7p1 and OpenSSL to 1.01j.
<...>
- 27.10.2013: first release (Unison 2.40.102)
Version update Unison was updated to version 1.5
Version update Unison was updated to version 1.2
More downloads Unison reached 1 000 - 5 000 downloads
What are users saying about Unison
T
by T####:
by T####:
Too dated. Does not work on newer versions of Android.
T
by T####:
by T####:
Tool doesn't give information on which port unison s listening and which user I have to make use when connecting.
P
by P####:
by P####:
This doesn't do anything but take you to the paid app download page.
J
by J####:
by J####:
Requires root
N
by N####:
by N####:
The "Lost connection with the server" error means unison is having trouble using ssh to contact the server. In my case I had my own ssh executable I was trying to use, and SELinux was preventing applications installed in /data (including unison) from running system apps. Moving the unison executables into /system/xbin fixed it. Configuring SELinux to let unison run ssh also would have worked, and so would using socket mode with a unison server. The lost connection error is very generic - it just means something went wrong using ssh to run unison on the server. I diagnosed it by setting unison's sshcmd to a script I wrote to run env and echo $*. The idea was to see the environment variables and command line parameters ssh was seeing, duplicate it manually, and where it failed. But my script wasn't called, which pointed to SELinux being the problem. Now that it's fixed, unison is working very well.
M
by M####:
by M####:
Pfff. No help from the developer. Any other 2-way sync software to sync a large home?
E
by E####:
by E####:
Simply doesn't work. I get the unhelpful lost connection message every time, with no clue how to fix it.
Y
by Y####:
by Y####:
Works just as well as the computer version: perfectly. Every bit as fast and efficient.
Y
by Y####:
by Y####:
Excellent job.
Y
by Y####:
by Y####:
I so appreciate being able to sync with my laptop.
Y
by Y####:
by Y####:
Thank you for making this app :)
X
by X####:
by X####:
Just the app I was always looking for.
P
by P####:
by P####:
Simply doesn't work. I get the unhelpful lost connection message every time, with no clue how to fix it.
M
by M####:
by M####:
Works just as well as the computer version: perfectly. Every bit as fast and efficient.
M
by M####:
by M####:
Excellent job.
M
by M####:
by M####:
I so appreciate being able to sync with my laptop.
M
by M####:
by M####:
Thank you for making this app :)
S
by S####:
by S####:
Just the app I was always looking for.
by C####:
The "Lost connection with the server" error means unison is having trouble using ssh to contact the server. In my case I had my own ssh executable I was trying to use, and SELinux was preventing applications installed in /data (including unison) from running system apps. Moving the unison executables into /system/xbin fixed it. Configuring SELinux to let unison run ssh also would have worked, and so would using socket mode with a unison server. The lost connection error is very generic - it just means something went wrong using ssh to run unison on the server. I diagnosed it by setting unison's sshcmd to a script I wrote to run env and echo $*. The idea was to see the environment variables and command line parameters ssh was seeing, duplicate it manually, and where it failed. But my script wasn't called, which pointed to SELinux being the problem. Now that it's fixed, unison is working very well.