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update README

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Daniel Langbein 2023-09-05 17:54:40 +02:00
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README.md
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@ -2,7 +2,7 @@
For each host (server, laptop, etc.), there is a subdirectory inside [hosts](hosts).
## NixOS Installation
## NixOS installation
For beginners, NixOS can be installed with a graphical installer.
@ -17,7 +17,7 @@ During installation, select manual partitioning:
* One 512MB (or larger) Fat32 partition, mounted at `/boot`, "boot" flag enabled
* Another partition (e.g. BTRFS) covering the rest of the drive, mounted at `/`, encryption enabled
## Build and Switch
## Build and switch
* https://nixos.wiki/wiki/Nixos-rebuild
@ -41,7 +41,7 @@ niv update
Then run `nixos-rebuild switch`, see above.
## Garbage Collection
## Garbage collection
* https://nixos.org/manual/nix/stable/package-management/garbage-collection.html
* https://discourse.nixos.org/t/why-doesnt-nix-collect-garbage-remove-old-generations-from-efi-menu/17592/4
@ -58,26 +58,6 @@ Remove old generations from EFI:
sudo /run/current-system/bin/switch-to-configuration boot
```
## Evaluate configuration.nix to JSON
TODO: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-show-config.html
* https://discourse.nixos.org/t/can-i-run-nix-instantiate-eval-strict-on-my-configuration-nix/7105/4
This evaluates `configuration.nix` (single module):
```shell
NIXPKGS_ALLOW_UNFREE=1 nix-instantiate --strict --json --eval -E '
import ./hosts/yodaTab/configuration.nix {
config = {};
pkgs = import <nixpkgs> {};
lib = import <nixpkgs/lib>;
}
' > evaluated-config.json
```
Then open [evaluated-config.json](evaluated-config.json).
## Install Home Manager with niv
niv:
@ -141,7 +121,7 @@ Summary:
* Regenerate hardware-configuration: `sudo nixos-generate-config --dir $(hostname)`
* Add `swapDevices = [ { device = "/swap/swapfile"; } ];` to hardware configuration and run `nixos-rebuild switch` (see above).
## Automount Encrypted Drive
## Automount encrypted drive
* Generate and add keyfile to LUKS device
* luksOpen and mount drive, e.g. to `/mnt/data1`
@ -245,6 +225,67 @@ Excerpt of the result:
/nix/store/jqvxmx65mfinbsm6db9kmcqmphl44xhp-nano-7.2/share/nano/autoconf.nanorc
```
### NixOS configuration debugging
* https://nixos.wiki/wiki/Nix_command/repl
Evaluating parts of the configuration.
First, start `nix repl`:
```shell
nix repl --file '<nixpkgs/nixos>' -I nixos-config=hosts/$(hostname)/configuration.nix
```
Example: `config.home-manager`
```shell
config.home-manager.
# Press `TAB`
#=> config.home-manager.backupFileExtension config.home-manager.useUserPackages
#=> config.home-manager.extraSpecialArgs config.home-manager.users
#=> config.home-manager.sharedModules config.home-manager.verbose
#=> config.home-manager.useGlobalPkgs
```
Example: The `home` variable:
```shell
config.home-manager.users.yoda.home
```
Example: The value of one config option
```shell
# The following option is set to `"${config.xdg.dataHome}/.histfile";`
# where `config` is the Home Manager configuration.
config.home-manager.users.yoda.programs.zsh.history.path
#=> "/home/yoda/.local/share/.histfile"
```
### Evaluate NixOS configuration to JSON
See also section "NixOS Configuration Debugging"!
TODO: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-show-config.html
* https://discourse.nixos.org/t/can-i-run-nix-instantiate-eval-strict-on-my-configuration-nix/7105/4
This evaluates `configuration.nix` (single module):
```shell
NIXPKGS_ALLOW_UNFREE=1 nix-instantiate --strict --json --eval -E '
import ./hosts/yodaTab/configuration.nix {
config = {};
pkgs = import <nixpkgs> {};
lib = import <nixpkgs/lib>;
}
' > evaluated-config.json
```
Then open [evaluated-config.json](evaluated-config.json).
### References
Some references to websites that helped me create this repository: