bug#25089: Can't build source derivations with Guix 0.11.0-4.1f41

[Leo Famulari <leo@famulari.name>]

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On Sun, Dec 04, 2016 at 10:05:48PM +0100, Ludovic Courtès wrote:
> Leo Famulari <leo@famulari.name> skribis:
> The main difference is that downloads are performed by the daemon itself
> (via the ‘guix perform-download’ internal command), which was not the
> case before (see <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22774#13>.)

Okay, I'll investigate this change.

> > Starting download of /gnu/store/hbdalsf5lpf01x4dcknwx6xbn6n5km6k-hello-2.10.tar.gz
> > From http://ftpmirror.gnu.org/hello/hello-2.10.tar.gz...
> > following redirection to `http://mirrors.ibiblio.org/pub/mirrors/gnu/ftp/gnu/hello/hello-2.10.tar.gz'...
> > following redirection to `http://mirrors.ibiblio.org/gnu/ftp/gnu/hello/hello-2.10.tar.gz'...
> > ERROR: In procedure open-file: Permission denied: "/gnu/store/hbdalsf5lpf01x4dcknwx6xbn6n5km6k-hello-2.10.tar.gz"
> 
> It should definitely have write permission on the output file.
> 
> Could you ‘strace -f’ guix-daemon or something like that to see under
> what UID ‘guix perform-download’ executes?  It’s expected to be running
> as a build user, but not in a chroot.

It does appear to be running as a build user.

I realized that I can, in fact, build source derivations, but I can't
--check them. I use `guix build --source --check foo` to make sure a
package has the right source URL.

So my original report was misleading, sorry.

I can reproduce this on GuixSD, after reconfiguring my system based on
8243951ef1b9d (gnu: guix: Update development snapshot.).

Can you try reproducing it like this?

$ guix build hello --source && guix build hello --source --check

I've attached gzip compressed strace logs, created with `strace -f -p
PID -o FILE`.

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