bug#25704: guix on other distribution fails to pull

[Tomas Cech]

I'm having problems with running Guix on top of openSUSE. I installed
clean 0.12 release on clean system.

$ guix pull

Starting download of /tmp/guix-file.Z09Ce2
From http://git.savannah.gnu.org/cgit/guix.git/snapshot/master.tar.gz...
 ….tar.gz                                   3.0MiB/s 00:04 | 11.0MiB transferred
unpacking '/gnu/store/z13bqhi66zzxhzdql046khzm09r21xxq-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%
fetching path `/gnu/store/k4jwdl2ca04552z9hd9c0721wxlahjyy-curl-7.47.0'...
Downloading 
https://mirror.hydra.gnu.org/nar/k4jwdl2ca04552z9hd9c0721wxlahjyy-curl-7.47.0 
(1.8MiB installed)...
 curl-7.47.0                                 444KiB/s 00:01 | 632KiB transferred

fetching path `/gnu/store/2mz84alls2i314x4506wdw15zwmz82n8-python-2.7.10'...
Downloading 
https://mirror.hydra.gnu.org/nar/2mz84alls2i314x4506wdw15zwmz82n8-python-2.7.10 
(77.2MiB installed)...
 python-2.7.10                              4.0MiB/s 00:04 | 15.3MiB transferred

hash mismatch in downloaded path 
`/gnu/store/2mz84alls2i314x4506wdw15zwmz82n8-python-2.7.10': expected 
4f6ac594d87839f78be751763fda022f57910f77011616c95f22a53655b0942d, got 
222a0f7d89133c011acd36536141c87239a71b43c36a5dd1d939460058a15f98
building path(s) `/gnu/store/cwc9qg98wavxy69jvj42srdl14594b11-apr-util-1.5.4'
guix pull: error: build failed: some substitutes for the outputs of derivation 
`/gnu/store/acgss8990yn864yxf857ba9fyjsyfsa7-python-2.7.10.drv' failed (usually 
happens due to networking issues); try `--fallback' to build derivation from 
source


This shows 2 problems:

- pull doesn't support `--fallback'
- hydra build of apr-util is probably corrupted


When I try to help manually, it sometimes helps...

 $ guix build apr-util --fallback
The following derivation will be built:
   /gnu/store/3fz5akwl2s3f7n1lp04avdcwcnnwfnyc-apr-util-1.5.4.drv
@ build-started /gnu/store/3fz5akwl2s3f7n1lp04avdcwcnnwfnyc-apr-util-1.5.4.drv 
- x86_64-linux 
/var/log/guix/drvs/3f//z5akwl2s3f7n1lp04avdcwcnnwfnyc-apr-util-1.5.4.drv.bz2
grafting '/gnu/store/symq7x013biwxc697271vvm0nxpb4d13-apr-util-1.5.4' -> 
'/gnu/store/cwc9qg98wavxy69jvj42srdl14594b11-apr-util-1.5.4'...
@ build-succeeded 
/gnu/store/3fz5akwl2s3f7n1lp04avdcwcnnwfnyc-apr-util-1.5.4.drv -
/gnu/store/cwc9qg98wavxy69jvj42srdl14594b11-apr-util-1.5.4

$ guix pull

Starting download of /tmp/guix-file.VxLjfT
From http://git.savannah.gnu.org/cgit/guix.git/snapshot/master.tar.gz...
 ….tar.gz                                   3.1MiB/s 00:04 | 11.0MiB transferred
unpacking '/gnu/store/z13bqhi66zzxhzdql046khzm09r21xxq-guix-latest.tar.gz'...
fetching path `/gnu/store/2mz84alls2i314x4506wdw15zwmz82n8-python-2.7.10'...
Downloading 
https://mirror.hydra.gnu.org/nar/2mz84alls2i314x4506wdw15zwmz82n8-python-2.7.10 
(77.2MiB installed)...
 python-2.7.10                              4.2MiB/s 00:04 | 15.3MiB transferred

hash mismatch in downloaded path 
`/gnu/store/2mz84alls2i314x4506wdw15zwmz82n8-python-2.7.10': expected 
4f6ac594d87839f78be751763fda022f57910f77011616c95f22a53655b0942d, got 
222a0f7d89133c011acd36536141c87239a71b43c36a5dd1d939460058a15f98
building path(s) `/gnu/store/nw1lim6cr83rfbyih6pz41rnc0f1l2cs-file-5.25'
guix pull: error: build failed: some substitutes for the outputs of derivation 
`/gnu/store/acgss8990yn864yxf857ba9fyjsyfsa7-python-2.7.10.drv' failed (usually 
happens due to networking issues); try `--fallback' to build derivation from 
source

...and sometimes it gives me different hash...

$ guix build address@hidden --fallback
/gnu/store/7fm1qk703x47qzb9p6xg08cxgb009akz-python-2.7.10
/gnu/store/813i9qr3l6w5ada97l1m1cna08fzrra9-python-2.7.10-tk

...and pull will never work.


Is there anything I could do to workaround the problem?