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home-manager/FAQ.md

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2018-02-05 22:17:31 +01:00
Frequently Asked Questions (FAQ)
================================
Why is there a collision error when switching generation?
---------------------------------------------------------
Home Manager currently installs packages into the user environment,
precisely as if the packages were installed through
`nix-env --install`. This means that you will get a collision error if
your Home Manager configuration attempts to install a package that you
already have installed manually, that is, packages that shows up when
you run `nix-env --query`.
For example, imagine you have the `hello` package installed in your
environment
```console
$ nix-env --query
hello-2.10
```
and your Home Manager configuration contains
home.packages = [ pkgs.hello ];
Then attempting to switch to this configuration will result in an
error similar to
```console
$ home-manager switch
these derivations will be built:
/nix/store/xg69wsnd1rp8xgs9qfsjal017nf0ldhm-home-manager-path.drv
[…]
Activating installPackages
replacing old home-manager-path
installing home-manager-path
building path(s) /nix/store/b5c0asjz9f06l52l9812w6k39ifr49jj-user-environment
Wide character in die at /nix/store/64jc9gd2rkbgdb4yjx3nrgc91bpjj5ky-buildenv.pl line 79.
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
builder for /nix/store/b37x3s7pzxbasfqhaca5dqbf3pjjw0ip-user-environment.drv failed with exit code 2
error: build of /nix/store/b37x3s7pzxbasfqhaca5dqbf3pjjw0ip-user-environment.drv failed
```
The solution is typically to uninstall the package from the
environment using `nix-env --uninstall` and reattempt the Home Manager
generation switch.
Why are the session variables not set?
--------------------------------------
Home Manager is only able to set session variables automatically if it
manages your Bash or Z shell configuration. If you don't want to let
Home Manager manage your shell then you will have to manually source
the
~/.nix-profile/etc/profile.d/hm-session-vars.sh
file in an appropriate way. In Bash and Z shell this can be done by
adding
```sh
. "$HOME/.nix-profile/etc/profile.d/hm-session-vars.sh"
```
to your `.profile` and `.zshrc` files, respectively. The
`hm-session-vars.sh` file should work in most Bourne-like shells.