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 protected]> wrote: > > 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 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 > -- 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
