bug#25213: Character encoding issue causing broken symlinks for profile generation

[Leo Famulari <leo@famulari.name>]

On Thu, Dec 15, 2016 at 09:23:56PM +0000, Christopher Baines wrote:
> The profile generation/union code generates broken symlinks. I've reproduced
> this on 2 different machines (both Debian running Guix).

Thanks for the report!

> To reproduce, run:
> 
>   guix environment --pure --container --ad-hoc nss-certs findutils coreutils
> 
> [env]# find $GUIX_ENVIRONMENT/etc/ssl/certs -xtype l -exec head {} \;
> 
> head: cannot open '/gnu/store/g41lycan2cq74qfs6acsxmxk4c4ra0pd-profile/etc/ssl/certs/Certinomis_-_Autorit??_Racine:2.1.1.pem'
> for reading: No such file or directory
> head: cannot open '/gnu/store/g41lycan2cq74qfs6acsxmxk4c4ra0pd-profile/etc/ssl/certs/NetLock_Arany_=Class_Gold=_F??tan??s??tv??ny:2.6.73.65.44.228.0.16.pem'
> for reading: No such file or directory
> head: cannot open '/gnu/store/g41lycan2cq74qfs6acsxmxk4c4ra0pd-profile/etc/ssl/certs/T??RKTRUST_Elektronik_Sertifika_Hizmet_Sa??lay??c??s??_H6:2.6.125.161.242.101.236.138.pem'
> for reading: No such file or directory
> head: cannot open '/gnu/store/g41lycan2cq74qfs6acsxmxk4c4ra0pd-profile/etc/ssl/certs/AC_Ra??z_Certic??mara_S.A.:2.15.7.126.82.147.123.224.21.227.87.240.105.140.203.236.12.pem'
> for reading: No such file or directory
> head: cannot open '/gnu/store/g41lycan2cq74qfs6acsxmxk4c4ra0pd-profile/etc/ssl/certs/T??B??TAK_UEKAE_K??k_Sertifika_Hizmet_Sa??lay??c??s??_-_S??r??m_3:2.1.17.pem'
> for reading: No such file or directory
> head: cannot open '/gnu/store/g41lycan2cq74qfs6acsxmxk4c4ra0pd-profile/etc/ssl/certs/T??RKTRUST_Elektronik_Sertifika_Hizmet_Sa??lay??c??s??_H5:2.7.0.142.23.254.36.32.129.pem'
> for reading: No such file or directory
> 
> Note the ?? in the names, which are the points where the names are
> incorrect.

The interesting thing is that the links appear to be broken in some
cases and not others:

[env]# ls -l '/gnu/store/xxiqkmck8g8n6ic4jbxq84m1028vhrdj-profile/etc/ssl/certs/AC_Ra??z_Certic??mara_S.A.:2.15.7.126.82.147.123.224.21.227.87.240.105.140.203.236.12.pem'
lrwxrwxrwx 3 65534 65534 164 Jan  1  1970 '/gnu/store/xxiqkmck8g8n6ic4jbxq84m1028vhrdj-profile/etc/ssl/certs/AC_Ra??z_Certic??mara_S.A.:2.15.7.126.82.147.123.224.21.227.87.240.105.140.203.236.12.pem' -> '/gnu/store/c7kr9pdni867k2778pykh16sw003kl1s-nss-certs-3.27.2/etc/ssl/certs/AC_Ra??z_Certic??mara_S.A.:2.15.7.126.82.147.123.224.21.227.87.240.105.140.203.236.12.pem'