ocaml-maint team mailing list archive

[Etienne URBAH <1875475@xxxxxxxxxxxxxxxxxx>]

On Ubuntu 20.04, I successfully downgraded Unison (text only) to the
version compiled with OCaml 4.02 from https://www.urs-
mueller.ch/de/computer/download/unison-2.48.4-linux-x86_64-text-
static.tar.gz

Using the unison-jz snap installing Unison 2.51.2 compiled against OCaml 4.02.3 as described by https://unix.stackexchange.com/questions/583058/unison-and-version-compiler-conflicts/583377#583377 requires that :
- 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://www.urs-mueller.ch/de/computer/index.html
  - Windows,  for example at https://www.irif.fr/~vouillon/unison/

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 --> /usr/bin/unison-OCaml-4.02-2.48.4

- unison-OCaml-4.02 version 2.51.2 should contain
  /usr/bin/unison-OCaml-4.02 --> /usr/bin/unison-OCaml-4.02-2.51.2

- unison-OCaml-4.06 version 2.48.4 should contain
  /usr/bin/unison-OCaml-4.06 --> /usr/bin/unison-OCaml-4.06-2.48.4

- unison-OCaml-4.06 version 2.51.2 should contain
  /usr/bin/unison-OCaml-4.06 --> /usr/bin/unison-OCaml-4.06-2.51.2

  This would permit, on the server, to install Unison binaries compiled
with ALL OCaml versions.

-- 
You received this bug notification because you are a member of Debian
OCaml Maintainers, which is subscribed to unison in Ubuntu.
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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/unison/+bug/1875475/+subscriptions