gistfile1.txt

$ sudo nixos-rebuild switch -I nixpkgs=.
building Nix...
these paths will be fetched (0.88 MiB download, 3.42 MiB unpacked):
  /nix/store/i57wr9raazilf2bqpblsfark2pf67as7-nix-1.8pre3705_71a20d4
fetching path `/nix/store/i57wr9raazilf2bqpblsfark2pf67as7-nix-1.8pre3705_71a20d4'...

*** Downloading ‘http://cache.nixos.org/nar/0415ww6rj91w438b7x5h2gw16mjixxh4f4rzqgrwqv8bv8g8csgy.nar.xz’ to ‘/nix/store/i57wr9raazilf2bqpblsfark2pf67as7-nix-1.8pre3705_71a20d4’...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  899k  100  899k    0     0   750k      0  0:00:01  0:00:01 --:--:--  751k

building the system configuration...
these derivations will be built:
  /nix/store/0mb4w644gx9ql6npmiwv102jaa037sm9-gummiboot-builder.py.drv
  /nix/store/1bqnpygnwiaxhcvpj7sq3c8bys8kcvci-system-crontab.drv
  /nix/store/34ix177h1pqi6rhyhp7grw2hz3adr2z5-nixos-version.drv
  /nix/store/3xmxsmmrj2kcggvxdi4klrw2c0rsadss-nixos-help.drv
  /nix/store/4q729cac06lfb9sxgpdzl3c60cf2ykss-options-db.xml.drv
  /nix/store/6cph7q81liq7n7g3rr7v8zr3hbpj0yh2-unit-script.drv
  /nix/store/6lp0q8j5an6ad02bqpqz2y1mwv9vkhv6-etc-file.drv
  /nix/store/7lfrfmakp16sf8618aikx3b1wnm6lcbg-etc.drv
  /nix/store/9bavkp3jyzlrd70kq41z42qzzhd18f3m-unit.drv
  /nix/store/9hm4b3bq3zqh5zicshbwr0i923w29shk-nixos-14.10.git.b459a93.drv
  /nix/store/9hv2jbxr1hj49m7kzkk7dpszlsamrgzm-system-units.drv
  /nix/store/a7f8qdxzzd7413x7c0zal46lddxmqa2z-dbus-conf.drv
  /nix/store/cmxq6vv0yrih683skd2ximfqvjpapkiq-user-units.drv
  /nix/store/dgd4kcmx271psd26rq7h705rp453wx79-unit.drv
  /nix/store/fdl5l19s87nmbp3m0bbkzmjj06g7c2wi-closure.drv
  /nix/store/hp0ikbqls73swi3pj317qdpbahrwz4pw-unit.drv
  /nix/store/k0b8a54wa99pgcqli4gmsr1xwlw43lmp-system-path.drv
  /nix/store/p4yxsqvwk5jk3n9a6rc6h5zy8mndnk0c-nixos-install.drv
  /nix/store/rhiv0k7mxh7b9g003g562i4wgrka4s7i-nixos-manual.drv
  /nix/store/v95k5f9f04nmm7x0351q8098ag9m3dcw-nixos-rebuild.drv
  /nix/store/w1x9q59wy0a36kx3lnq1fn08xc3gkdli-nixos-manpages.drv
  /nix/store/yrvhzx5b656q88pcx036qpns8lr09pjq-issue.drv
building path(s) `/nix/store/adg4z1ps78gywsrhhk134jrdcknakzmc-gummiboot-builder.py'
building path(s) `/nix/store/7bj5k7azg79fbrkfq5qqslc5ba0ndj0s-etc-file'
building path(s) `/nix/store/cbp0qcy2xbjsc5k3ka2b1x15l9gwxbiv-issue'
building path(s) `/nix/store/7a11s88bh8qzs6diz2vs58n3i6x10yvk-nixos-version'
error: executing `/nix/store/lyfiqs1ixd7qhih16dw5i6xrrb6nz7hl-nix-1.8pre3679_f609eec/libexec/nix': Permission denied
killing process 14293
error: unexpected EOF reading a line