Is it possible to system reconfigure from a local guix git?

[Denis 'GNUtoo' Carikli]

Hi,

I'm still using i686 to be able to know when it's broken and if
time permits, to send patches to fix some of the issues affecting me.

Since patches often take a long time to be reviewed (we probably need
more reviewers), I was wondering if it was possible to reconfigure from
a local Guix git checkout.

Running a system straight from a git repository would also enable me to
improve my workflow and test better the patches.

The issue I have here is that I can easily do that:
> $ guix shell -D guix
> $ ./pre-inst-env guix system build system.scm

But I didn't find a way to make sudo and pre-inst-env work together.

I've tried things like that:
> $ sudo -E ./pre-inst-env guix system reconfigure system.scm

And it reconfigured my system but I then have a broken guix
installation:
> $ guix shell -D guix
> ;;; Failed to autoload symlink-spec-option-parser in (guix scripts
> pack): ;;; Throw to key `record-abi-mismatch-error' with args
> `(abi-check "~a: record ABI mismatch; recompilation needed"
> (#<record-type <svn-reference>>) ())'.

What is the correct way (if any) to do something like that?

PS: There is also normally a way to recover from that since I was
    helped on IRC to recover and at some point it worked.
    So I'll try various things like 'rm -rf ~/.cache/guile/ccache/ &&
    guix pull' until I find how to recover.

Denis.

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