Building an app in travis

[Richard Hughes]

Hi all,

We're building fwupd in travis for each commit and each branch we
push. As part of this build we build against Fedora, Debian and now we
also build a flatpak too. This travis build also creates the various
release-time deliverables, e.g. the .deb, the .rpm and the .flatpak
bundle.

What I need to do is build the current version of fwupd that is
checked out in the local directory. For instance, you can do this in
snap:

    source: .
    source-type: git

I've tried this in the flatpak manifest:

            "sources": [
                {
                    "type": "git",
                    "path": ".."
                }
            ]

...which works locally but not on travis:

Resolving deltas: 100% (587/587), done.
warning: reject refs/heads/wip/hughsie/flatpak because shallow roots
are not allowed to be updated
warning: reject refs/remotes/origin/wip/hughsie/flatpak because
shallow roots are not allowed to be updated
fatal: ambiguous argument 'master': unknown revision or path not in
the working tree.

The fallback plan is to use the $TRAVIS_BRANCH env var and re-write
the manifest as part of the build process but that's not awesome at
all. Ideas on how to do this properly most welcome, although I fear it
might be teaching flatpak-builder to just use the existing git
checkout without updating it (like snap can do).

Thanks for any ideas,

Richard