this derivation will be built:
  /nix/store/b4qmpp9d8bd7a4v91hxr79gpvk5x1bch-xkcd-font-unstable-2017-08-24.drv
building '/nix/store/vswsw4h68mshfvx1wafaddwqv5mii44m-xkcd-font-unstable-2017-08-24.drv' on 'grpc://farm.numtide.com:50051?client-cert=/run/secrets/vars/per-machine/bld1/nix-farm-ci/crt&client-key=/run/secrets/vars/per-machine/bld1/nix-farm-ci/key&connect-timeout=22&system=aarch64-linux'
building '/nix/store/vswsw4h68mshfvx1wafaddwqv5mii44m-xkcd-font-unstable-2017-08-24.drv' on farm.numtide.com:50051
xkcd-font-unstable-2017-08-24> elastic-arm-384804be: building vswsw4h68mshfvx1wafaddwqv5mii44m-xkcd-font-unstable-2017-08-24.drv
xkcd-font-unstable-2017-08-24> 
xkcd-font-unstable-2017-08-24> trying https://github.com/ipython/xkcd-font/archive/5632fde618845dba5c22f14adc7b52bf6c52d46d.tar.gz
xkcd-font-unstable-2017-08-24>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
xkcd-font-unstable-2017-08-24>                                  Dload  Upload   Total   Spent    Left  Speed
xkcd-font-unstable-2017-08-24>   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
xkcd-font-unstable-2017-08-24> 100  809k    0  809k    0     0  1540k      0 --:--:-- --:--:-- --:--:-- 1540k
xkcd-font-unstable-2017-08-24> unpacking source archive /build/5632fde618845dba5c22f14adc7b52bf6c52d46d.tar.gz

upload niks3: ok