Can't run in docker inside github workflow CI

[dkegel-sigsci]

See #15

Works fine in github... unless you try to use it inside docker, where it fails with

modprobe: can't change directory to '/lib/modules': No such file or directory
ERROR: No available nbd device found!

Looking around for ideas:

• alpine-make-vm-image could fall back to guestmount from http://libguestfs.org
• users could run alpine-make-vm-image using qemu, possibly via a nice wrapper like https://github.com/multiarch/qemu-user-static, https://github.com/dbhi/qus, or https://github.com/gotoz/runq

I forked this project to https://github.com/dankegel/alpine-make-vm-image/tree/test-on-github, added a .github/workflows/test.yml to test running on github, and then gave libguestfs the old college try. Unfortunately, I couldn't get libguestfs to work inside docker, even locally.
But the branch is there in case anyone wants a look.

For now, the best option is still don't run inside docker on github :-)

[jirutka]

Works fine in github... unless you try to use it inside docker

So why do you run it inside docker? It doesn’t make any sense.

[dkegel-sigsci]

Because my job requires me to use a mac, and requires my scripts to run on the mac. Spinning up a good linux VM would not fit the workflow, but Docker for Mac makes it easy.

Face it, a large chunk of the world uses Docker for everything, and in part does not have any way not to. Saying "don't use Docker" is, alas, like saying "Don't use Windows" :-(

Now, for CI, we don't use Mac, we use github actions and Linux, so I don't need to use Docker there. Whew. But I do have to special case my script to use (old) Docker on Mac, and no Docker on Linux.