xbps-src: recompute XBPS_MASTERDIR and XBPS_HOSTDIR in chroot stage.

[yopito]

fix Issue #8282

[pullmoll]

I still see an error message when using ./xbps -m /tmp/some/path … binary-bootstrap:

chmod: cannot access '/void-packages/masterdir/builddir': No such file or directory

from line xbps-src:716. Perhaps we should add --quiet or -f to the chmod params.

Also note that the option handling is -m) readonly XBPS_MASTERDIR=….
Wouldn't that need to be changed to an export XBPS_MASTERDIR=…?

[yopito]

Thanks for inputs. Additional rework is needed.

[yopito]

I'ts better now.

About -m) readonly XBPS_MASTERDIR=…. : I think export is still uneeded here, since It's already working in "normal" mode ?

the rationale for this tiny modification is that chrooted xbps-src is in fact a new process, launched without any option (see common/xbps-src/shutils/chroot.sh:221); so this patch should be sufficient at this time.

I don't often use all possible commands of xbps-src; I will try the one related to chroot this week-end just in case.

[yopito]

@pullmoll: I've fixed what you've found. Could you give a try again ? thx