48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
|
# Why is there a collision error when switching generation? {#_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
|
|||
|
|
|
|||
|
|
``` nix
|
|||
|
|
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.
|
|||
|
|
|
|||
|
|
You could also opt to unistall *all* of the packages from your profile
|
|||
|
|
with `nix-env --uninstall '*'`.
|