My NixOS configuration

This is very much inspired by (at least) the following configurations:

Setup

Download the latest NixOS minimal install ISO In a terminal window run:
```
make nixos/download
```
Create and start the virtual machine In a terminal window run:
```
make vm/create
```
This will create and start the VM. The default name for the VM is devbox, to use a different name you can provide the name in the NIX_NAME environment variable:
```
NIX_NAME=my-awesome-box make vm/create
```
Wait for the VM to start (this might take a while as it downloads the ISO and boots the installer). If you want to save some time, you can also give the path to the installer ISO using the environment variable NIX_ISO:
```
NIX_ISO=/tmp/nixos-minimal.iso make vm/create
```
Change the root password In the VM, switch to root user: sudo su and change the password: passwd (the new password must be root)
Install NixOS
```
VM_IP=xxx.xxx.xxx.xxx make nixos/install
```
You can find out the IP address of the VM either by running ip a in the VM or from your hosts terminal by running:
```
virsh net-dhcp-leases default | grep nixos | awk '{ print $5 }' | sed 's/\/.\*//'
```
This will end up in an error: make: *** [Makefile:39: nixos/install] Error 255 but you can safely ignore this, it's just because the VM is rebooting.
Take a snapshot of the VM (optional) At this point you can take a snapshot of the VM if you want, just so you have a good base to return to in case you mess something up. See: snapshot management
Bootstrap the nix configuration
```
VM_IP=xxx.xxx.xxx.xxx make nixos/bootstrap
```
This will by default create a user tuomo, but if you want to change that, you can provide the username in the environment variable NIX_USER:
```
NIX_USER=johndoe make nixos/bootstrap
```
Change your user's password Login as the normal user (password is password) and change the password to whatever you want.

You might also want to change the root password and disable ssh for root.
Finalize the user setup
```
VM_IP=xxx.xxx.xxx.xxx make nixos/usersetup
```
This will install Home Manager and apply user configurations.
Enjoy! After making any changes to the home-manager configs, (in the nix-config repo folder) run:
```
home-manager switch --flake .#tuomo
```
And after any system wide changes, (in the nix-config repo folder) run:
```
sudo nixos-rebuild switch --flake .#
```

Snapshot management

Create snapshot

virsh shutdown --domain devbox
virsh snapshot-create-as --domain devbox --name "pre-bootstrap"
virsh start devbox

replace devbox with the name of your VM if you changed it.

Reverting back to the snapshot

virsh shutdown --domain devbox
virsh snapshot-revert --domain devbox --snapshotname "pre-bootstrap" --running

Listing snapshots
```
virsh snapshot-list devbox
```

Deleting a snapshot

virsh snapshot-delete --domain devbox --snapshotname "pre-bootstrap"

Other stuff

Configure a static IP to the VM

Find out the MAC address of the VM:
```
virsh dumpxml devbox |grep -i '<mac'
```
Edit the default network:
```
virsh net-edit default
```

Find the following section:

<dhcp>
  <range start='xxx.xxx.xxx.xxx' end='xxx.xxx.xxx.xxx' />

And append the static IP after the range:

<dhcp>
  <range start='xxx.xxx.xxx.xxx' end='xxx.xxx.xxx.xxx' />
  <host mac='XX:XX:XX:XX:XX:XX' name='devbox' ip='xxx.xxx.xxx.xxx' />

Restart the DHCP service:

virsh net-destroy default
virsh net-start default

Connecting to a running VM

virt-viewer --connect qemu:///system --wait devbox

virsh --connect qemu:///system console devbox

Deleting everything and starting over

Stop the VM with virsh destroy devbox
Remove the domain with virsh undefine devbox --nvram (deletes the VM)
Remove the disk image