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Cole Mickens 2020-10-25 15:00:44 -07:00
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@ -47,33 +47,64 @@ These three examples, for me, are all the same source, but accessed in different
## overview ## overview
The `./check.sh` script proves they give the same exact system toplevel outputs: Let's prove that we can build the same config with and without flakes:
```console * Using `nixos-rebuild`:
cole@slynux ~/code/nixos-flake-example master* 7s ```
❯ ./check.sh # with flakes
unset NIX_PATH
nixos-rebuild build --flake .#mysystem
readlink -f ./result
/nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
:: Updating the 'nixpkgs' input in flake.nix # without flakes
+ nix flake update --update-input nixpkgs export NIX_PATH=nixpkgs=https://github.com/nixos/nixpkgs/archive/007126eef72271480cb7670e19e501a1ad2c1ff2.tar.gz:nixos-config=/home/cole/code/nixos-flake-example/configuration.nix
+ set +x nixos-rebuild build
readlink -f ./result
/nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
```
:: Using 'nixos-rebuild' to build the 'mysystem' toplevel * Using `nix build`:
+ nixos-rebuild build --flake .#mysystem ```
warning: Git tree '/home/cole/code/nixos-flake-example' is dirty # with flakes
building the system configuration... unset NIX_PATH
warning: Git tree '/home/cole/code/nixos-flake-example' is dirty nix build '.#nixosConfigurations.mysystem.config.system.build.toplevel
+ set +x readlink -f ./result
/nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
:: Using rev=007126eef72271480cb7670e19e501a1ad2c1ff2 for <nixpkgs> (extracted from flake.nix) # without flakes
export NIX_PATH=nixpkgs=https://github.com/nixos/nixpkgs/archive/007126eef72271480cb7670e19e501a1ad2c1ff2.tar.gz:nixos-config=/home/cole/code/nixos-flake-example/configuration.nix
nix-build '<nixos/nixpkgs>' -A config.system.build.toplevel
readlink -f ./result
/nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
```
:: Setting NIX_PATH to the same values flakes is using * The `./check.sh` script automates this process:
+ NIX_PATH=nixpkgs=https://github.com/nixos/nixpkgs/archive/007126eef72271480cb7670e19e501a1ad2c1ff2.tar.gz:nixos-config=/home/cole/code/nixos-flake-example/configuration.nix
+ nix-build '<nixpkgs/nixos>' -A config.system.build.toplevel
/nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
+ set +x
flake: /nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git ```console
clssc: /nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git cole@slynux ~/code/nixos-flake-example master* 7s
❯ ./check.sh
``` :: Updating the 'nixpkgs' input in flake.nix
+ nix flake update --update-input nixpkgs
+ set +x
:: Using 'nixos-rebuild' to build the 'mysystem' toplevel
+ nixos-rebuild build --flake .#mysystem
warning: Git tree '/home/cole/code/nixos-flake-example' is dirty
building the system configuration...
warning: Git tree '/home/cole/code/nixos-flake-example' is dirty
+ set +x
:: Using rev=007126eef72271480cb7670e19e501a1ad2c1ff2 for <nixpkgs> (extracted from flake.nix)
:: Setting NIX_PATH to the same values flakes is using
+ NIX_PATH=nixpkgs=https://github.com/nixos/nixpkgs/archive/007126eef72271480cb7670e19e501a1ad2c1ff2.tar.gz:nixos-config=/home/cole/code/nixos-flake-example/configuration.nix
+ nix-build '<nixpkgs/nixos>' -A config.system.build.toplevel
/nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
+ set +x
flake: /nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
clssc: /nix/store/gg1jhmzqndqa0rfnwfdbnzrn8f74ckr6-nixos-system-mysystem-21.03pre-git
```