Use mmdebstrap as default

[zeha]

Necessary for grml-small. And generally a good idea.

[zeha]

@mika wrote:

I'm actually wondering whether we should drop cdebootstrap support, I never ever use that, I think it's worth dropping this?

Agree, we should probably drop cdebootstrap support. I think it's dead in Debian, too.

We should also considering dropping debootstrap support. Doing that will allow us being clear about the tool that will run, remove a config var, simplify the test matrix, etc. And IMO mmdebstrap is strictly the better tool - if available.

Doing that might mean killing support for running on stretch. Or we figure out what to do about --no-check-gpg for stretch's mmdebstrap.

[adrelanos]

Does debootstrap have better cross architecture build support?

Or qemu-debootstrap?

I think it's worth keeping support for changing debootstrap tool for future-proofness.

[adrelanos]

Switching the default however seems nice.

[zeha]

Does debootstrap have better cross architecture build support? Or qemu-debootstrap?

Even if they do, grml-debootstrap has IIRC no cross support.

[adrelanos]

grml-debootstrap has cross build support. Building ARM64 (on AMD64) was implemented here:

• https://github.com/grml/grml-debootstrap/issues/169
• https://github.com/grml/grml-debootstrap/pull/191

[zeha]

grml-debootstrap has cross build support. Building ARM64 (on AMD64) was implemented here:

• ARM support #169
• Initial arm64 support #191

Right. Then we should also run CI for that.