ocaml-maint team mailing list archive

[Gary Hasson <1875475@xxxxxxxxxxxxxxxxxx>]

The accepted work-around is to manually install prior versions of unison
and unison-gtk. It seems to me that the solution to this bug is to
replace the faulty unison and unison-gtk in the repository with the
known good versions (from 19.04 for example). People who have been using
the faulty version from Ubuntu 20.04 would be updated to the good
version, after which they would get an error message from Unison when
they used the good version with a sync that was previously done with the
faulty version. The error message simply tells them to delete the sync
archive file and then re-sync.

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https://bugs.launchpad.net/bugs/1875475

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=2.48.4-4ubuntu1) works
  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("input_value: ill-formed message")

  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
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  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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