nixpkgs/home/packages/custom/update-system/default.nix

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{ writeShellApplication }:
writeShellApplication {
name = "custom-update-system";
text = ''
nix-channel --update
home-manager switch
oldVersion=$(home-manager generations | head -n 2 | tail -n 1 | cut -d' ' -f 7)
newVersion=$(home-manager generations | head -n 1 | cut -d' ' -f 7)
nvd diff "$oldVersion" "$newVersion"
home-manager expire-generations '-30 days'
nix-env --delete-generations +5
nix store gc
nix store optimise
'';
}