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Subject: bug#31956: guix environment: add option to download and unpack source
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I've a minor feature request.

When working on new package definitions, it's often useful to debug
build failures with guix environment.

The current implementation, as I understand it, requires manually
downloading the source, and merely drops you into whatever working
directory you happen to be it.

It would be great if there were an option you could pass that downloads
and unpacks the source somewhere and drops you into the newly unpacked
source directory.

Not sure what to call it exactly, but something like:

  guix environment --with-source hello

Should drop you into an unpacked source directory with the inputs and
such for building "hello".


live well,
  vagrant

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To: Vagrant Cascadian <vagrant@HIDDEN>
Subject: bug#31956: Acknowledgement (guix environment: add option to
 download and unpack source)
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Subject: bug#31956: guix environment: add option to download and unpack source
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On Sun, 24 Jun 2018 12:06:17 -0700
Vagrant Cascadian <vagrant@HIDDEN> wrote:

> I've a minor feature request.
>=20
> When working on new package definitions, it's often useful to debug
> build failures with guix environment.
>=20
> The current implementation, as I understand it, requires manually
> downloading the source, and merely drops you into whatever working
> directory you happen to be it.
>=20
> It would be great if there were an option you could pass that
> downloads and unpacks the source somewhere and drops you into the
> newly unpacked source directory.
>=20
> Not sure what to call it exactly, but something like:
>=20
>   guix environment --with-source hello
>=20
> Should drop you into an unpacked source directory with the inputs and
> such for building "hello".

Hi Vagrant,

if you need this in the case of build failures, use the "-K" option:

https://www.gnu.org/software/guix/manual/guix.html#Common-Build-Options

--keep-failed
-K

    Keep the build tree of failed builds. Thus, if a build fails, its
build tree is kept under /tmp, in a directory whose name is shown at
the end of the build log. This is useful when debugging build issues.
See Debugging Build Failures, for tips and tricks on how to debug build
issues.


See also

https://www.gnu.org/software/guix/manual/guix.html#Debugging-Build-Failures

For the case that the built went through OK, there is no such option.
You could raise an exception at the end of your package
definition/build phases.

Also there is the -S option to build:

guix build -S <package-name>

builds the source of your package. This will download the package,
verifies the checkum applies patches and applies snippets (i.e. rules
to remove for example binaries or other non-free-licensed parts).

Bj=C3=B6rn


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Subject: bug#31956: guix environment: add option to download and unpack source
Resent-From: Danny Milosavljevic <dannym@HIDDEN>
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Date: Sun, 24 Jun 2018 21:27:27 +0200
From: Danny Milosavljevic <dannym@HIDDEN>
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Hi Vagrant,

On Sun, 24 Jun 2018 12:06:17 -0700
Vagrant Cascadian <vagrant@HIDDEN> wrote:

> It would be great if there were an option you could pass that downloads
> and unpacks the source somewhere and drops you into the newly unpacked
> source directory.
>=20
> Not sure what to call it exactly, but something like:
>=20
>   guix environment --with-source hello

+1

Right now, my silly workaround is to add a phase which fails

  (add-after 'unpack 'fail
    (lambda _
      (error "stop it")))

and then do

  guix build --keep-failed hello

and then do

  guix environment --pure hello
  cd /tmp/guix-build-hello*

That's... very manual.

Also, if the directory in /tmp is not .drv-0, the environment is technicall=
y not the same as it was inside the guix-daemon build container.

In that case there'd be an extra step

  rm -rf /tmp/guix-build-hello-*.drv-0
  ln -s /tmp/guix-build-hello-* /tmp/guix-build-hello-<...>.drv-0
  cd /tmp/guix-build-hello-<...>.drv-0

All in all that's not simple.

Also, guix-daemon is taken from Nix and thus not exactly the same as
guix environment in some cases.

That's why in some cases I have to (edit the package definition and
invoke guix build) over and over again in order to find a problem.

In the long term we'll replace guix-daemon by guix environment.
Much easier to reproduce situations then.

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Danny Milosavljevic writes:

>> Not sure what to call it exactly, but something like:
>>=20
>>   guix environment --with-source hello
>
> +1
>
> Right now, my silly workaround is to add a phase which fails
>
>   (add-after 'unpack 'fail
>     (lambda _
>       (error "stop it")))
>
> and then do
>
>   guix build --keep-failed hello
>
> and then do
>
>   guix environment --pure hello
>   cd /tmp/guix-build-hello*
>
> That's... very manual.

A very nice recipe...interesting we had a discussion about this today on
#guix.  What I would really like, is for the --with-source directory
be a git archive, so that edits can be made and tested until it works.

Attempt a rebuild with new patches/new git commit and repeat.

Making repeated patches until a build succeeds is something I find
pretty cumbersome.

It could be an ad-hoc, new git archive.  It would also be nice if Guix
could somehow record upstream sources as (shallow?, tarred?) git
archives.

janneke

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Jan Nieuwenhuizen <janneke@HIDDEN> | GNU LilyPond http://lilypond.org
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