YAMLs for snaps built using PPAs

snapcraft
1

I recently tried to rebuild the evince 3.28 snap from the provided snapcraft.yaml. However, “snapcraft cleanbuild” failed since the build happens in a xenial container and the source uses a newer version of gtk than in the xenial archives. According to the build logs at https://launchpad.net/~ubuntu-desktop/+snap/evince, the snap I downloaded was built using the gnome-3-26 backports ppa. Thus the yaml doesn’t include all the information needed to recreate the snap.

If the standard repositories don’t supply the required build-packages, can the yaml specify which additional repositories (such as gnome-3-26 backports) are needed? And is it possible to automatically install such additional dependencies in container builds?

2

it’s not possible to do this declaratively. The only way to achieve this purely with snapcraft.yaml changes is to add imperative code using the override-* blocks:

...

parts:
    gnome-3-26:
        after: [desktop-gnome-platform]
        plugin: nil
        override-build: |
            echo "deb http://ppa.launchpad.net/ubuntu-desktop/gnome-3-26/ubuntu xenial main" | tee /etc/apt/sources.list.d/gnome-3-26.list
            apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 399B698EEA9EF163B6F9A0F62CC98497A1231595
            apt update
            apt upgrade -yy
       prime: [-*]

    your-app:
        after: [gnome-3-26]
        ...

plugs:
    gnome-3-26-1604:
        interface: content
        target: $SNAP/gnome-platform
        default-provider: gnome-3-26-1604:gnome-3-26-1604

apps:
    your-app:
        command: desktop-launch $SNAP/usr/bin/your-app
        ...
1 Like
3

also, see: Proposal: additional package sources