Can not use scion-apps from a Bazel project

[ekuiter]

It is not possible to require this repository with Bazel as a go_repository, e.g., go_repository(name="com_github_netsec_ethz_scion_apps", importpath="github.com/netsec-ethz/scion-apps").
Gazelle will try and generate Bazel BUILD files, which fails with the following error message:

vagrant@ubuntu-xenial:/vagrant/scion-apps$ gazelle -go_prefix github.com/netsec-ethz/scion-apps -repo_roo t .
gazelle: finding module path for import github.com/lucas-clemente/quic-go/h2quic: exit status 1: can't load package: package github.com/lucas-clemente/quic-go/h2quic: module github.com/lucas-clemente/quic-go@latest found (v0.15.2), but does not contain package github.com/lucas-clemente/quic-go/h2quic

This is because quic-go renamed the h2quic directory to http3. It would be nice if this could be fixed, so that Go projects that use Bazel can reference this repository as a library.

[matzf]

What exactly could we do to fix this on our side? Do you want us to update to the latest version? We can't do this "unilaterally", as our quic-go version is essentially dictated by scionproto/scion. There is an existing PR there, to update this, but, as far as I know, nobody is working on this right now.

Anyway, couldn't you make gazelle somehow consider the go.mod modules to get a working set of versions? My expectation would be that if it just pulls the latest version of everything, you will never get something that works.

[ekuiter]

I guess I "fixed" it by copying the relevant code into my project (https://github.com/ekuiter/scion-android-binary/tree/master/scion-android), as I ran into some other problems when trying to fix this.

Regarding gazelle: Yes and no. On first initialization, gazelle seems to ignore versions in go.mod, which leads to the error. Afterwards, one can run gazelle update-repos -from_file=go.mod, which seems to work. However, I can't seems to wrap my head around Bazel in general, and copying the files seems easiest for now in my use case. (Thanks anyway!)

[matzf]

FYI, we've updated quic-go to the latest version, following the same change on scionproto/scion.

Closing, because there is nothing "actionable" here.