The snap package isn't compatible with the version from macOS homebrew either.
In the end, I just went with the binary tarballs available from https://github.com/bcpierce00/unison/releases The reason for these incompatibilities is described here: https://github.com/bcpierce00/unison/#getting-unison "Beware that Unison uses OCaml's built-in data marshalling, and that this facility is unstable across versions of "ocaml" (the standard implementation of the OCaml language). Additionally, Unison has incompatible changes across minor releases (e.g. 2.48 vs 2.51, but 2.51.2 and 2.51.3 are compatible). Therefore, you must use the same Unison minor version built with the same ocaml version on all systems." To make compatible packages for 16.04/18.04/20.04 would require either a newer OCaml to build the 16.04/18.04 packages, or an older OCaml to build the 18.04/20.04 packages. I do think that the incompatible versions should be reflected in the package naming, e.g. "unison" is a meta-package and "unison-2.51.3-4.12.0" is the actual package. Then potentially multiple versions could be installed and /etc/alternatives/unison could point to the chosen one. But unless someone actually builds these different versions, it doesn't really matter. There are other more modern filesystem synchronization tools available, like Syncthing. -- 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 _______________________________________________ Mailing list: https://launchpad.net/~ocaml-maint Post to : [email protected] Unsubscribe : https://launchpad.net/~ocaml-maint More help : https://help.launchpad.net/ListHelp
