How can the module be used

[dschrempf]

It is not clear to me how this module can be used with NixOps. If I install NixOps from the NixOps GitHub repository, this libvirtd backend is not found. If I try to enter a nix-shell in this (nixops-libvirtdd) repository, I get the compilation error appended below. Maybe I misunderstand something, but it would be very nice, if a working example is available somewhere!

Thank you!

The compilation error:

/build/attrs-19.3.0/dist /build/attrs-19.3.0
  Building wheel for libvirt-python (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /nix/store/d44wd6n98f93hjr6q1d1phhh1hw7a17d-python3-3.8.8/bin/python3.8 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/build/pip-req-build-fyzfaq7y/setup.py'"'"'; __file__='"'"'/build/pip-req-build-fyzfaq7y/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /build/pip-wheel-smh3gsqx
       cwd: /build/pip-req-build-fyzfaq7y/
  Complete output (13 lines):
  running bdist_wheel
  running build
  pkg-config --print-errors --atleast-version=0.9.11 libvirt
  /nix/store/d44wd6n98f93hjr6q1d1phhh1hw7a17d-python3-3.8.8/bin/python3.8 generator.py libvirt /nix/store/4xqh13fvpbas5ssl9hdnjgy9l3xvvxaq-libvirt-7.0.0/share/libvirt/api/libvirt-api.xml
  Found 480 functions in /nix/store/4xqh13fvpbas5ssl9hdnjgy9l3xvvxaq-libvirt-7.0.0/share/libvirt/api/libvirt-api.xml
  Found 0 functions in libvirt-override-api.xml
  Generated 389 wrapper functions
  Missing type converters:
  char ** *:1
  char **:1
  ERROR: failed virDomainAuthorizedSSHKeysGet
  ERROR: failed virDomainAuthorizedSSHKeysSet
  error: command '/nix/store/d44wd6n98f93hjr6q1d1phhh1hw7a17d-python3-3.8.8/bin/python3.8' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for libvirt-python
  Running setup.py clean for libvirt-python
Failed to build libvirt-python
ERROR: Failed to build one or more wheels
builder for '/nix/store/n37vvich127z79ksmrx0cp38dxzxr99r-python3.8-libvirt-python-6.4.0.drv' failed with exit code 1
cannot build derivation '/nix/store/j6l03g3nkxyv6rp9kdc6k68v685yhlxm-python3-3.8.8-env.drv': 1 dependencies couldn't be built
error: build of '/nix/store/j6l03g3nkxyv6rp9kdc6k68v685yhlxm-python3-3.8.8-env.drv' failed

[dschrempf]

OK, so I answer this question myself. It took me a while to figure everthing out. (Is anybody reading these issues? If so, is this module still developed?)

I used the NixOS unstable channel and installed nixopsUnstable (this already installs nixops-libvirtd, so no need to even clone this reopository. Then I followed the steps in the Readme.md.

virtualisation.libvirtd.enable = true;
users.extraUsers.myuser.extraGroups = [ "libvirtd" ];
networking.firewall.checkReversePath = false;

images=/var/lib/libvirt/images
sudo mkdir $images
sudo chgrp libvirtd $images
sudo chmod g+w $images

sudo virsh pool-define-as default dir --target $images
sudo virsh pool-autostart default
sudo virsh pool-start default

Then, I had to create my own machine configuration file (both the example and the test file didn't work).

Let's call it workingExample.nix.

{
  machine =
    { resources, ... }:
    {
      deployment.targetEnv = "libvirtd";
      deployment.libvirtd = {
        headless = true;
      };
    };
  network =
    {
      description = "libvirtd test";
    };
}

Then, I used

nixops create -d lv workingExample.nix
nixops deploy -d lv

Also, I rebooted after switching to the new system configuration.