Previously the code took the kernelPatches of the final derivation, which
might or might not be what was passed to the derivation in the original call.
The previous behaviour caused various hacks to become neccessary to avoid duplicates in kernelPatches.
Currently the docker client is only available on non-linux platforms as `docker`,
this makes the client available on linux and other platforms as `docker-client`.
Since the update to wlroots 0.13 (e03dde82a7) the default VGA card
isn't supported anymore and we needed to switch to virtio (qxl didn't
work either). However, as it turned out "-vga virtio" (28b8cff301)
broke the test on AArch64. Luckily there's a third option that works on
all three supported platforms: virtio-gpu-pci
According to [0] "This device lacks VGA compatibility mode but is
otherwise identical to the virtio vga device. UEFI firmware can handle
this, and if your guests has drivers too you can use this instead of
virtio-vga. This will reduce the attack surface (no complex VGA
emulation support) and reduce the memory footprint by 8 MB (no pci
memory bar for VGA compatibility). This device can be placed in a PCI
Express slot."
So in the end this seems like the ideal choice :)
See also [1].
[0]: https://www.kraxel.org/blog/2019/09/display-devices-in-qemu/#virtio-gpu-pci
[1]: https://patches.openembedded.org/patch/164351/
The tests timeout on AArch64 (e.g. [0] and [1]), likely because the QEMU
option "-vga virtio" isn't supported there (unfortunately I currently
lack access to an AArch64 system with NixOS to investigate).
This also affects the test for Cage but that one is already limited to
x86_64-linux.
[0]: https://hydra.nixos.org/build/144148809
[1]: https://hydra.nixos.org/build/144103034
Builds fine with it, so no need to pin an older version.
(This originally was triggered by qtwebengine failing for Qt514.
The build has been fixed on master in the meantime, but I guess it still
makes sense)
The absence of current-context in the right place resulted in obscure
bugs. The reason this has not been detected before can only be that
it was unused.
