ocaml-maint team mailing list archive

[Andrew Piskorski <1971036@xxxxxxxxxxxxxxxxxx>]

In older versions of Ubuntu, I believe multiple "unison-VERSION"
packages were provided, and the "unison-all" metapackage simply
installed all of them for you.  In both Ubuntu 20.04.5 and 22.04.1,
those version-specific Unison packages seem to be long gone, and only
ONE version of Unison is provided.  Thus the unison-all package was
already effectively useless on 20.04.5, but at some point in the past,
it was very useful indeed!

Why were the version-specific Unison binary packages discontinued?  They
were very useful and user-friendly.

Ubuntu 20.04.5 LTS provides "/usr/bin/unison-2.48.4" from its "unison"
package.  I tried copying the 20.04.5 /usr/bin/unison-2.48.4 into
/usr/local/bin/ on my 22.04.1 machine.  Then I specified "servercmd =
unison-2.48.4" in my Profile file.  This does NOT work, as Unison
reports:

Fatal error
Server: Archive file seems damaged (input_value: ill-formed message): throw away archives on both machines and try again

On Ubuntu 20.04.5 (focal), simply copying the old /usr/bin/unison-*
binaries from older versions of Ubuntu often worked fine, they would run
on 20.04 and work for syncing with older versions of Ubuntu.  That
apparently no longer works with 22.04.1 (jammy) vs. 20.04.5 (focal).

-- 
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/1971036

Title:
  Unison incompatible between ubuntu 20.04 and 22.04

Status in unison package in Ubuntu:
  Confirmed

Bug description:
  The same problem as every other year:

  With every new LTS release unison becomes incompatible with the new
  and the last Ubuntu release. Even if not incompatible in a technical
  way, unison compares the version string and denies to communicate with
  a different version.

  So it is (without dirty workarounds such as running an old unison in a
  docker image) not possible to synchronize files between a 20.04 and a
  22.04 machine.

  
  Would be nice, to either have the old version available in 22.04, or the new version available in 20.04. 

  regards

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: unison 2.48.4-4ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-109.123-generic 5.4.178
  Uname: Linux 5.4.0-109-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.23
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: LXQt
  Date: Sat Apr 30 13:06:45 2022
  InstallationDate: Installed on 2020-06-12 (686 days ago)
  InstallationMedia: Lubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: unison
  UpgradeStatus: No upgrade log present (probably fresh install)

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