Differences between container used by "guix build" and "guix environment -C -N"

[Danny Milosavljevic]

Hi,

I'm trying to track down the test_process_mask problem in Guix when trying to 
test rustc.

For that I did:

(apply attached patch)
$ guix build --keep-failed rustc # will fail
$ cd /tmp/guix-build-rustc-1.16.0.drv-0
$ guix environment -C -N rustc
$ bash
$ source environment-variables
$ cd rustc-1.16.0-src
$ ./x86_64-unknown-linux-gnu/stage2/test/stdtest-x86_64-unknown-linux-gnu 2>&1 
|grep test_process_mask

will not fail.

Why does it fail in "guix build", then?

Q
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