Comment 13 for bug 1875475
Revision history for this message
| Benjamin Pierce (bcpierce) wrote Re: [Bug 1875475] Unison from Ubuntu 20.04 is incompatible with Unison from Ubuntu 18.04, Windows or Mac OS X | #13 |
I’d suggest one slight tweak to the design: To maintain compatibility with people’s current way of doing business, there should be a new command line / preference file switch that defaults to false and that, when true, causes the current OCaml version to be included in the name of the server command.
> On Jun 6, 2020, at 7:50 PM, Etienne URBAH <email address hidden> wrote:
>
> On Ubuntu 20.04, I successfully downgraded Unison (text only) to the
> version compiled with OCaml 4.02 from https:/
> mueller.
> static.tar.gz
>
> Using the unison-jz snap installing Unison 2.51.2 compiled against OCaml 4.02.3 as described by https:/
> - The --devmode option of the snap command is NOT necessary,
> - The problem of the Include line in /etc/ssh/ssh_config is solved,
> - Binaries of Unison 2.51.2 compiled against OCaml 4.02.3 are also provided for :
> - Mac OS-X, for example at https:/
> - Windows, for example at https:/
>
> On the long term, I would prefer that the Unison packages explicitly
> contain the OCaml version, and the default value of servercmd should
> contain the name of the server binary compiled with the same OCaml
> version. For example :
>
> - unison-OCaml-4.02 version 2.48.4 should contain
> /usr/bin/
>
> - unison-OCaml-4.02 version 2.51.2 should contain
> /usr/bin/
>
> - unison-OCaml-4.06 version 2.48.4 should contain
> /usr/bin/
>
> - unison-OCaml-4.06 version 2.51.2 should contain
> /usr/bin/
>
> This would permit, on the server, to install Unison binaries compiled
> with ALL OCaml versions.
>
> --
> You received this bug notification because you are subscribed to unison
> in Ubuntu.
> https:/
>
> Title:
> Unison from Ubuntu 20.04 is incompatible with Unison from Ubuntu
> 18.04, Windows or Mac OS X
>
> Status in unison package in Ubuntu:
> Confirmed
>
> Bug description:
> Unison from Ubuntu 20.04 LTS (version unison=
> well with a client in exactly the same version, with exactly the same
> OS.
>
> However, it does not work well with Unison 2.48.4-1ubuntu1 from Ubuntu
> 18.04, or with Unison on other OSes.
>
> Once the client has determined the files that were updated, when I click on 'Go', the synchronisation fails with a message like this one:
>> Fatal error:
>> Uncaught exception Failure(
>
> Sometimes there is the mention "possibly because client and server
> have been compiled with different versions of the Ocaml compiler."
>
> I have seen this issues in the following configurations
> - 2.48.4-4ubuntu1 on Ubuntu 20.04 LTS (client) and 2.48.4-1ubuntu1 on Ubuntu 18.04 LTS (server) => Fails
> - 2.48.? on Mac OS X (client) and 2.48.4-4ubuntu1 on Ubuntu 20.04 LTS (server) => Fails
> - 2.48.3 on Windows 7 (client) and 2.48.4-4ubuntu1 on Ubuntu 20.04 LTS (server) => Fails
>
> Note that the Mac OS and Windows clients were working well with unison
> 2.48.4-1ubuntu1 (Ubuntu 18.04 LTS, server).
>
> Maybe my problem could be solved by reverting unison to the version
> 2.48.4-1ubuntu1 from Ubuntu 18.04 LTS. Is is possible to do so with
> `apt install` on Ubuntu 20.04? Thanks!
>
> ProblemType: Bug
> DistroRelease: Ubuntu 20.04
> Package: unison 2.48.4-4ubuntu1
> ProcVersionSign
> Uname: Linux 5.4.0-26-generic x86_64
> ApportVersion: 2.20.11-0ubuntu27
> Architecture: amd64
> CasperMD5CheckR
> CurrentDesktop: ubuntu:GNOME
> Date: Mon Apr 27 19:18:59 2020
> InstallationDate: Installed on 2020-04-16 (11 days ago)
> InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
> SourcePackage: unison
> UpgradeStatus: Upgraded to focal on 2020-04-21 (6 days ago)
>
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> https:/
>