[bug#43193] [PATCH] guix: Add --with-dependency-source option

[Jesse Gibbons <jgibbons2357@gmail.com>]

On 9/13/20 6:55 AM, Ludovic Courtès wrote:
> Hi,
>
> Jesse Gibbons <jgibbons2357@gmail.com> skribis:
>
>> On 9/11/20 9:43 AM, Ludovic Courtès wrote:
> [...]
>
>>> So maybe drop the second clause for non-recursive replacement, and drop
>>> ‘transform-package-source’ as well.
>> I included a fallback to transform-package-source because the
>> following happens:
>>
>> $ ./pre-inst-env guix build --with-source=$(guix build --source hello) hello
>> guix build: error: invalid source replacement specification:
>> "/gnu/store/hbdalsf5lpf01x4dcknwx6xbn6n5km6k-hello-2.10.tar.gz"
>>
>> This does not fail when I fall back to the non-recursive logic.
>>
>> I can drop transform-package-source, but I will need to do some more
>> hacking to figure out how the package name and version are parsed from
>> the file name as described in the manual, and move it to the logic in
>> transform-package-inputs/source.
> Yes, that’d be nice.  Namely, if you do:
>
>    guix build hello --source=hello-1.2.3.tar.gz
>
> it should work just as now (from the source file name, we assume that
> the source applies to package “hello”).
>
> Conversely, doing:
>
>    guix build hello --source=xyz-hello-1.2.3.tar.gz
>
> would have no effect.  It would not even emit a warning, unlike now.
I was able to get this working nicely.
>> I'm not going to have as much free time starting next week, so I might
>> not be able to do that for a while, but I will try to get it done
>> ASAP.
> Sure, let’s stay in touch, I think we’re almost done!

I wrote a new test that checks non-leafs. The following tests fail:

test-name: options->transformation, no transformations
test-name: options->transformation, with-source
test-name: options->transformation, with-source, replacement
test-name: options->transformation, with-source, with version
test-name: options->transformation, with-source, no matches
test-name: options->transformation, with-source, PKG@VER=URI

Some of these tests raise a similar error, some only have a false actual 
value, and "options->transformation, with-source, no matches" will need 
to be changed at the test level because it checks for a warning in the 
output. I've been trying to debug, but the tests don't even give a stack 
trace. I will do what I can to fix the tests and follow up at the end of 
the week.

-Jesse