48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
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# Why is there a collision error when switching generation? {#_why_is_there_a_collision_error_when_switching_generation}
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Home Manager currently installs packages into the user environment,
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precisely as if the packages were installed through `nix-env --install`.
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This means that you will get a collision error if your Home Manager
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configuration attempts to install a package that you already have
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installed manually, that is, packages that shows up when you run
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`nix-env --query`.
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For example, imagine you have the `hello` package installed in your
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environment
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``` shell
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$ nix-env --query
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hello-2.10
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```
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and your Home Manager configuration contains
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``` nix
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home.packages = [ pkgs.hello ];
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```
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Then attempting to switch to this configuration will result in an error
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similar to
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``` shell
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$ home-manager switch
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these derivations will be built:
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/nix/store/xg69wsnd1rp8xgs9qfsjal017nf0ldhm-home-manager-path.drv
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[…]
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Activating installPackages
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replacing old ‘home-manager-path’
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installing ‘home-manager-path’
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building path(s) ‘/nix/store/b5c0asjz9f06l52l9812w6k39ifr49jj-user-environment’
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Wide character in die at /nix/store/64jc9gd2rkbgdb4yjx3nrgc91bpjj5ky-buildenv.pl line 79.
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collision between ‘/nix/store/fmwa4axzghz11cnln5absh31nbhs9lq1-home-manager-path/bin/hello’ and ‘/nix/store/c2wyl8b9p4afivpcz8jplc9kis8rj36d-hello-2.10/bin/hello’; use ‘nix-env --set-flag priority NUMBER PKGNAME’ to change the priority of one of the conflicting packages
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builder for ‘/nix/store/b37x3s7pzxbasfqhaca5dqbf3pjjw0ip-user-environment.drv’ failed with exit code 2
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error: build of ‘/nix/store/b37x3s7pzxbasfqhaca5dqbf3pjjw0ip-user-environment.drv’ failed
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```
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The solution is typically to uninstall the package from the environment
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using `nix-env --uninstall` and reattempt the Home Manager generation
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switch.
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You could also opt to unistall *all* of the packages from your profile
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with `nix-env --uninstall '*'`.
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