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54 lines
1.5 KiB
Markdown
54 lines
1.5 KiB
Markdown
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R""(
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# Examples
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* Update the `nixpkgs` and `nix` inputs of the flake in the current
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directory:
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```console
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# nix flake update --update-input nixpkgs --update-input nix
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* Updated 'nix': 'github:NixOS/nix/9fab14adbc3810d5cc1f88672fde1eee4358405c' -> 'github:NixOS/nix/8927cba62f5afb33b01016d5c4f7f8b7d0adde3c'
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* Updated 'nixpkgs': 'github:NixOS/nixpkgs/3d2d8f281a27d466fa54b469b5993f7dde198375' -> 'github:NixOS/nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293'
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```
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* Recreate the lock file (i.e. update all inputs) and commit the new
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lock file:
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```console
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# nix flake update --recreate-lock-file --commit-lock-file
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…
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warning: committed new revision '158bcbd9d6cc08ab859c0810186c1beebc982aad'
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```
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# Description
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This command updates the lock file of a flake (`flake.lock`) so that
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it contains a lock for every flake input specified in
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`flake.nix`. Note that every command that operates on a flake will
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also update the lock file if needed, and supports the same
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flags. Therefore,
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```console
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# nix flake update --update-input nixpkgs
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# nix build
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```
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is equivalent to:
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```console
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# nix build --update-input nixpkgs
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```
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Thus, this command is only useful if you want to update the lock file
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separately from any other action such as building.
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> **Note**
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>
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> This command does *not* update locks that are already present unless
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> you explicitly ask for it using `--update-input` or
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> `--recreate-lock-file`. Thus, if the lock file already has locks for
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> every input, then `nix flake update` (without arguments) does
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> nothing.
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)""
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