Re: successful installation, but problems updating

[Marco van Hulten <marco@hulten.org>]

Ludovic-

This is the second time I tried a `guix pull':

```
root@watson ~# time guix pull

Starting download of /tmp/guix-file.x2AvJM
From https://git.savannah.gnu.org/cgit/guix.git/snapshot/master.tar.gz...
 ….tar.gz                                   2.3MiB/s 00:06 | 13.8MiB transferred
unpacking '/gnu/store/5sgb93jdacr36xv0xm67zr7dmlr1yyb0-guix-latest.tar.gz'...
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
The following derivations will be built:
   /gnu/store/s71rww59a0avvk9di4rkq3j5f9zvr62k-guix-latest.drv
   /gnu/store/6gxf5snkl5him1iqg6aqmpyn5ggijhx5-module-import-compiled.drv
   /gnu/store/fxnbl74nxjzzm44f1j25glsb3gav4k6b-module-import.drv
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%

Some deprecated features have been used.  Set the environment
variable GUILE_WARN_DEPRECATED to "detailed" and rerun the
program to get more information.  Set it to "no" to suppress
this message.

Some deprecated features have been used.  Set the environment
variable GUILE_WARN_DEPRECATED to "detailed" and rerun the
program to get more information.  Set it to "no" to suppress
this message.
copying and compiling to '/gnu/store/z8zygkj1c97xskgzxhwy4ys2b0x6shwm-guix-latest' with Guile 2.2.2...
loading...       26.0% of 646 filesrandom seed for tests: 1510087321
compiling...     75.2% of 646 filesGC Warning: Failed to expand heap by 8388608 bytes
building of `/gnu/store/s71rww59a0avvk9di4rkq3j5f9zvr62k-guix-latest.drv' timed out after 3600 seconds of silence
guix pull: error: build failed: build of `/gnu/store/s71rww59a0avvk9di4rkq3j5f9zvr62k-guix-latest.drv' failed

real    142m53.606s
user    0m3.098s
sys     0m1.369s
```

It took over 2 hours before I had control back over the system.  It is
very similar to the first `git pull' (even for the transfer speeds and
the percentage where `guix pull' hangs).  Of course, file/directory
checksums are different.  Also, it now tries to build three
`derivations' instead of one.  There is also a warning on about an
environment variable this time.

- Marco