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151 lines
4.8 KiB
Markdown
151 lines
4.8 KiB
Markdown
Frequently Asked Questions (FAQ)
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================================
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Why is there a collision error when switching generation?
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---------------------------------------------------------
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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
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`nix-env --install`. This means that you will get a collision error if
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your Home Manager configuration attempts to install a package that you
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already have installed manually, that is, packages that shows up when
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you run `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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```console
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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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home.packages = [ pkgs.hello ];
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Then attempting to switch to this configuration will result in an
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error similar to
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```console
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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
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environment using `nix-env --uninstall` and reattempt the Home Manager
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generation switch.
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Why are the session variables not set?
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--------------------------------------
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Home Manager is only able to set session variables automatically if it
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manages your Bash or Z shell configuration. If you don't want to let
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Home Manager manage your shell then you will have to manually source
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the
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~/.nix-profile/etc/profile.d/hm-session-vars.sh
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file in an appropriate way. In Bash and Z shell this can be done by
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adding
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```sh
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. "$HOME/.nix-profile/etc/profile.d/hm-session-vars.sh"
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```
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to your `.profile` and `.zshrc` files, respectively. The
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`hm-session-vars.sh` file should work in most Bourne-like shells.
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How do set up a configuration for multiple users/machines?
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----------------------------------------------------------
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A typical way to prepare a repository of configurations for multiple
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logins and machines is to prepare one "top-level" file for each unique
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combination.
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For example, if you have two machines, called "kronos" and "rhea" on
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which you want to configure your user "jane" then you could create the
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files
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- `kronos-jane.nix`,
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- `rhea-jane.nix`, and
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- `common.nix`
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in your repository. On the kronos and rhea machines you can then make
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`~jane/.config/nixpkgs/home.nix` be a symbolic link to the
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corresponding file in your configuration repository.
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The `kronos-jane.nix` and `rhea-jane.nix` files follow the format
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```nix
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{ ... }:
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{
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imports = [ ./common.nix ];
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# Various options that are specific for this machine/user.
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}
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```
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while the `common.nix` file contains configuration shared across the
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two logins. Of course, instead of just a single `common.nix` file you
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can have multiple ones, even one per program or service.
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You can get some inspiration from the [Post your home-manager home.nix
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file!][1] Reddit thread.
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[1]: https://www.reddit.com/r/NixOS/comments/9bb9h9/post_your_homemanager_homenix_file/
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Why do I get an error message about `ca.desrt.dconf`?
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-----------------------------------------------------
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You are most likely trying to configure the GTK or Gnome Terminal but
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the DBus session is not aware of the dconf service. The full error you
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might get is
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error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name ca.desrt.dconf was not provided by any .service files
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The solution on NixOS is to add
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services.dbus.packages = with pkgs; [ gnome3.dconf ];
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to your system configuration.
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How do I install packages from Nixpkgs unstable?
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------------------------------------------------
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If you are using a stable version of Nixpkgs but would like to install
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some particular packages from Nixpkgs unstable then you can import the
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unstable Nixpkgs and refer to its packages within your configuration.
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Something like
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```nix
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{ pkgs, config, ... }:
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let
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pkgsUnstable = import <nixpkgs-unstable> {};
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in
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{
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home.packages = [
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pkgsUnstable.foo
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];
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# …
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}
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```
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should work provided you have a Nix channel called `nixpkgs-unstable`.
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Note, the package will not be affected by any package overrides,
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overlays, etc.
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