[RFC] xbps-src: add -A flag for host arch, create masterdir per host arch

[classabbyamp]

Testing the changes

• I tested the changes in this PR: YES

Overview

• default masterdir naming now includes the host XBPS_ARCH, e.g. masterdir-x86_64
• setting the host XBPS_ARCH can be done with -A <arch>
  • This will create a new masterdir per host arch automatically
• using an arbitrary masterdir is still supported via -m <masterdir>, and overrides whatever -A would set
• the invocation of [binary-]bootstrap no longer (ab)uses $XBPS_TARGET_PKG for setting the masterdir's host architecture

Before

default:

$ ./xbps-src binary-bootstrap
$ ls
... masterdir ...

nondefault masterdir:

$ ./xbps-src -m masterdir-idk binary-bootstrap
$ ls
... masterdir-idk ...

specific host arch:

$ ./xbps-src -m masterdir-musl binary-bootstrap x86_64-musl
$ ls
... masterdir-musl ...

cross with specific host arch:

$ ./xbps-src -m masterdir-musl binary-bootstrap x86_64-musl
$ ./xbps-src -m masterdir-musl -a aarch64-musl pkg foo

After

default:

$ ./xbps-src binary-bootstrap
$ ls
... masterdir-x86_64 ...

nondefault masterdir:

$ ./xbps-src -m masterdir-idk binary-bootstrap
$ ls
... masterdir-idk ...

specific host arch:

$ ./xbps-src -A x86_64-musl binary-bootstrap
$ ls
... masterdir-x86_64-musl ...

cross with specific host arch:

$ ./xbps-src -A x86_64-musl binary-bootstrap
$ ./xbps-src -A x86_64-musl -a aarch64-musl pkg foo

Thoughts

• By removing the [binary-]bootstrap [arch] invocation style, there will be changes needed to buildbot configuration. If left in, should -A <arch> take priority over [arch] if both are specified? buildbot config will be changed
• This could be an opportunity to change the name of masterdir to something else, like masterdir (the containers CI uses are already called void-buildroot-<libc>) if this changes, it will be separate; there's too much to change both coherently

TODO

• various documentation/other xbps-src changes as needed
• buildbot changes if needed

[lemmi]

I like this change a lot. Personally I'm not opposed to remove the redundant flag to {binary-,}bootstrap, or at least fail if both options, -A and the argument to bootstrap, are specified. I'm less eager to rename masterdir, but since it's kind of an odd choice, I'm not against that.

[SpidFightFR]

Following the progress on that PR, it looks very interesting ! 🙏

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[ahesford]

Looks good to me