Home / ubuntu / Questions / 1377693
In Process
Igor Zinov'yev
Asked: 2021-11-27 03:00:33 +0800 CST

How to use a older version of a package from the same PPA as a dependency while building is Launchpad?

  • 772

I'm trying to package software for the Cardano blockchain using Launchpad, and so far I have been able to create a PPA with the required libsodium fork. This fork is required to build the Cardano node software, which was my next step - to build it and put it on the PPA as well. The problem is that in order to build the node software, the builder needs to use that PPA to be able to install the proper dependency.

Without it, I get build failures like this, where it fails to resolve the needed version:

The following packages have unmet dependencies:
 sbuild-build-depends-cardano-node-dummy : Depends: libsodium-dev (= 1.0.17.1-0ubuntu1) but 1.0.18-1 is to be installed
E: Unable to correct problems, you have held broken packages.

I have tried making the PPA a depedency, but apparently you can't do that because the package is built as part of the same PPA, and it can't depend on itself. What do I do here?

Edit to clarify: I am trying to build a package in a PPA that depends on a package that comes from the same PPA.

ppa

1 Answers

  1. The package cardano-node explicitly depends on libsodium-dev (= 1.0.17.1-0ubuntu1) which is in the PPA. However, version 1.0.18-1 is already available in the repositories, and the older version would not be installed.

    You have two options.

    1. If the version in the Ubuntu repositories work for you, then remove the explicit version number of the dependency libsodium-dev in the debian/control file.
    2. If you really need this older version with your package, then rebuild the older version under a fake version number like 2:1.0.17.1-0, and again remove the explicit version number from the debian/control file, so that the older version of libsodium-dev (now 2:1.0.17.1-0) would get a higher preference.
    • 1