permission denied: /gnu/store/...guile...

[rekado]

Hi Guix,

my apologies for this badly formatted email.  I'm using a webmail interface 
because I have not been able to set up my email through Emacs on GuixSD as I 
cannot build custom packages.

Here's what happens when I try to build a custom package from a git checkout of 
the guix repository:

~~~~~~
address@hidden guix $ ./pre-inst-env guix build ibus-pinyin
The following derivations will be built:
   /gnu/store/gbdfw3z89dxw5nh3qw5gq3y2p5i2l1a2-ibus-pinyin-1.5.0.drv
   /gnu/store/9pcjzs7g87vg2pc6ag877kxlmzg1v241-pyzy-0.1.0.tar.gz.drv
   /gnu/store/ni0hz29nyd051fsp2n73icjnwx28fajz-ibus-pinyin-1.5.0.tar.gz.drv
   /gnu/store/k2qwb22f1jzb9wr1cvkqv9bhdhmpyaqy-pyzy-0.1.0.drv
The following file will be downloaded:
   /gnu/store/7vrb932gf6lzsh5q0sskzgmjm2bwr91x-libtool-2.4.6
@ build-started 
/gnu/store/ni0hz29nyd051fsp2n73icjnwx28fajz-ibus-pinyin-1.5.0.tar.gz.drv - 
x86_64-linux 
/var/log/guix/drvs/ni//0hz29nyd051fsp2n73icjnwx28fajz-ibus-pinyin-1.5.0.tar.gz.drv.bz2
build error: executing 
`/gnu/store/cnqmkmj40jmssnx6fkf9n0n3bqj5x426-guile-2.0.11/bin/guile': 
Permission denied
builder for 
`/gnu/store/ni0hz29nyd051fsp2n73icjnwx28fajz-ibus-pinyin-1.5.0.tar.gz.drv' 
failed with exit code 1
@ build-failed 
/gnu/store/ni0hz29nyd051fsp2n73icjnwx28fajz-ibus-pinyin-1.5.0.tar.gz.drv - 1 
builder for 
`/gnu/store/ni0hz29nyd051fsp2n73icjnwx28fajz-ibus-pinyin-1.5.0.tar.gz.drv' 
failed with exit code 1
cannot build derivation 
`/gnu/store/gbdfw3z89dxw5nh3qw5gq3y2p5i2l1a2-ibus-pinyin-1.5.0.drv': 1 
dependencies couldn't be built
killing process 2391
guix build: error: build failed: build of 
`/gnu/store/gbdfw3z89dxw5nh3qw5gq3y2p5i2l1a2-ibus-pinyin-1.5.0.drv' failed
address@hidden guix $ 
~~~~~~ 

I have confirmed that this particular guile binary can be executed, so I don't 
know what permission problem it encounters.  I attached strace to the 
guix-daemon and it produced a long log which I have uploaded here: 
http://elephly.net/downies/guile-permission-denied.txt

The failing derivation is this:

~~~~~~
Derive([("out","/gnu/store/vvs2c9zzl9zwrq0zwrayjlih9cpwjbcq-ibus-pinyin-1.5.0.tar.gz","sha256","a85d458dcc51ea9fd65849e63002428b3fcb3b39adcbea9214b5cb4a4cbdbc96")],[("/gnu/store/479gki04zgbysxipcb1wdl56mh1bldbx-guile-2.0.11.drv",["out"]),("/gnu/store/p20cih7k80cpqka6f06100j1ycgf3fl1-module-import.drv",["out"]),("/gnu/store/s8bacxxryg87p2ag6gl46qz6jvpdm5qs-gnutls-3.4.0.drv",["out"]),("/gnu/store/w9g2dqsfgr6n8pslwmm2lgbka96qwig4-module-import-compiled.drv",["out"])],["/gnu/store/yhds5m08mgp3a3yb2gj9imn7pkap0fc1-ibus-pinyin-1.5.0.tar.gz-builder"],"x86_64-linux","/gnu/store/cnqmkmj40jmssnx6fkf9n0n3bqj5x426-guile-2.0.11/bin/guile",["--no-auto-compile","-L","/gnu/store/6fnbs4j7dsn6rc598d72caay00yggvh7-module-import","-C","/gnu/store/ww9kwrbs4h468vll6a3swg6dc3hr9f8i-module-import-compiled","/gnu/store/yhds5m08mgp3a3yb2gj9imn7pkap0fc1-ibus-pinyin-1.5.0.tar.gz-builder"],[("impureEnvVars","http_proxy
 
https_proxy"),("out","/gnu/store/vvs2c9zzl9zwrq0zwrayjlih9cpwjbcq-ibus-pinyin-1.5.0.tar.gz")])
~~~~~~

I have installed GuixSD from the 0.8.2 USB image onto a new, empty partition.  
I'm reusing only my home directory, which is located on a luks LVM.  I have 
pulled the latest version of Guix and reconfigured the system a few hours ago. 

Permissions on various store directories:

drwxrwxr-t 751 root guixbuild 479232 May 20 08:26 /gnu/store/
dr-xr-xr-x 6 root root 4096 Jan  1  1970 
/gnu/store/cnqmkmj40jmssnx6fkf9n0n3bqj5x426-guile-2.0.11/
-r-xr-xr-x 1 root root 10912 Jan  1  1970 
/gnu/store/cnqmkmj40jmssnx6fkf9n0n3bqj5x426-guile-2.0.11/bin/guile

I would appreciate any help, as I cannot hack on Guix as long as this problem 
persists.

~~ Ricardo