bug#35603: Go build system mishandles repetitive import paths (was [PATCH] build: go-build-system: Ensure uniform unpacking directory.)

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hello Leo,

Leo Famulari <leo@famulari.name> writes:

> On Sun, Apr 14, 2019 at 12:03:05AM -0400, Maxim Cournoyer wrote:
>> From 1f7535fbe28f7ac96e824b792e9f1a140b8c54cd Mon Sep 17 00:00:00 2001
>> From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
>> Date: Fri, 5 Apr 2019 00:00:08 -0400
>> Subject: [PATCH 3/3] build: go-build-system: Ensure uniform unpacking
>>  directory.
>>
>> Depending on whether the source is a directory or an archive, we strip the
>> source directory or preserve it, respectively.  This change makes it so that
>> whether the type of the source, it is unpacked at the expected location given
>> by the IMPORT-PATH of the Go build system.
>>
>> * guix/build/go-build-system.scm: Add the (ice-9 ftw) module.
>> (unpack): Add inner procedure to maybe strip the top level directory of an
>> archive, document it and use it.
>
> This commit (or patch series) broke the build of Syncthing and maybe
> others.

Thanks for the heads-up!

> It seems like the the new unpacking code is stripping duplicate
> directory names?
>

It does as documented in the docstring of the unpack phase:

   If the SOURCE archive has a single top level directory,
   it is stripped so that the sources appear directly under UNPACK-PATH.

This behavior was made possible with commit
f42e4ebb56fe4f16991ca6c6e060c8f3535865cb, that made it so that:

    [...] whether the type of the source, it is unpacked at the expected
    location given by the IMPORT-PATH of the Go build system.

> It fails like this:
>
> ------
> starting phase `increase-test-timeout'
> Backtrace:
>            6 (primitive-load "/gnu/store/yfvy06fscz726da5wjvh9jxjsah…")
> In ice-9/eval.scm:
>    191:35  5 (_ _)
> In srfi/srfi-1.scm:
>    863:16  4 (every1 #<procedure 870540 at /gnu/store/zmc0hcmdfg5n4…> …)
> In /gnu/store/zmc0hcmdfg5n4kl32vcla4cg9c9bspfg-module-import/guix/build/gnu-build-system.scm:
>    799:28  3 (_ _)
> In ice-9/eval.scm:
>     619:8  2 (_ #(#(#<directory (guile-user) 5ce140>) (#:inputs # …)))
> In /gnu/store/zmc0hcmdfg5n4kl32vcla4cg9c9bspfg-module-import/guix/build/utils.scm:
>    635:19  1 (with-atomic-file-replacement "src/github.com/syncthin…" …)
> In unknown file:
>            0 (mkstemp! "src/github.com/syncthing/syncthing/build.go…" …)
>
> ERROR: In procedure mkstemp!:
> In procedure mkstemp!: No such file or directory
> ------
>
> And indeed, if you keep the failed build directory, you will see that
> the path 'src/github.com/syncthing/syncthing' does not exist, even
> though this corresponds to the Go import path specified in the package
> definition.
>
> Instead it is like src/github.com/syncthing' which is incorrect.

The fix was to drop the "unpack-pack" argument of the go-build-system for
syncthing, which means we want the sources unpacked at the location
specified by the "import-path".

Done with commit d879fd80c74371120a2cfa30e18a2e28dc02d31d; closing.

Thank you!

Maxim