mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-24 23:06:16 +02:00
eb7d7780b1
This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
82 lines
2.5 KiB
Markdown
82 lines
2.5 KiB
Markdown
# Name
|
||
|
||
`nix-env --set-flag` - modify meta attributes of installed packages
|
||
|
||
# Synopsis
|
||
|
||
`nix-env` `--set-flag` *name* *value* *drvnames*
|
||
|
||
# Description
|
||
|
||
The `--set-flag` operation allows meta attributes of installed packages
|
||
to be modified. There are several attributes that can be usefully
|
||
modified, because they affect the behaviour of `nix-env` or the user
|
||
environment build script:
|
||
|
||
- `priority` can be changed to resolve filename clashes. The user
|
||
environment build script uses the `meta.priority` attribute of
|
||
derivations to resolve filename collisions between packages. Lower
|
||
priority values denote a higher priority. For instance, the GCC
|
||
wrapper package and the Binutils package in Nixpkgs both have a file
|
||
`bin/ld`, so previously if you tried to install both you would get a
|
||
collision. Now, on the other hand, the GCC wrapper declares a higher
|
||
priority than Binutils, so the former’s `bin/ld` is symlinked in the
|
||
user environment.
|
||
|
||
- `keep` can be set to `true` to prevent the package from being
|
||
upgraded or replaced. This is useful if you want to hang on to an
|
||
older version of a package.
|
||
|
||
- `active` can be set to `false` to “disable” the package. That is, no
|
||
symlinks will be generated to the files of the package, but it
|
||
remains part of the profile (so it won’t be garbage-collected). It
|
||
can be set back to `true` to re-enable the package.
|
||
|
||
{{#include ./opt-common.md}}
|
||
|
||
{{#include ../opt-common.md}}
|
||
|
||
{{#include ../env-common.md}}
|
||
|
||
# Examples
|
||
|
||
To prevent the currently installed Firefox from being upgraded:
|
||
|
||
```console
|
||
$ nix-env --set-flag keep true firefox
|
||
```
|
||
|
||
After this, `nix-env --upgrade ` will ignore Firefox.
|
||
|
||
To disable the currently installed Firefox, then install a new Firefox
|
||
while the old remains part of the profile:
|
||
|
||
```console
|
||
$ nix-env --query
|
||
firefox-2.0.0.9 (the current one)
|
||
|
||
$ nix-env --preserve-installed --install firefox-2.0.0.11
|
||
installing `firefox-2.0.0.11'
|
||
building path(s) `/nix/store/myy0y59q3ig70dgq37jqwg1j0rsapzsl-user-environment'
|
||
collision between `/nix/store/...-firefox-2.0.0.11/bin/firefox'
|
||
and `/nix/store/...-firefox-2.0.0.9/bin/firefox'.
|
||
(i.e., can’t have two active at the same time)
|
||
|
||
$ nix-env --set-flag active false firefox
|
||
setting flag on `firefox-2.0.0.9'
|
||
|
||
$ nix-env --preserve-installed --install firefox-2.0.0.11
|
||
installing `firefox-2.0.0.11'
|
||
|
||
$ nix-env --query
|
||
firefox-2.0.0.11 (the enabled one)
|
||
firefox-2.0.0.9 (the disabled one)
|
||
```
|
||
|
||
To make files from `binutils` take precedence over files from `gcc`:
|
||
|
||
```console
|
||
$ nix-env --set-flag priority 5 binutils
|
||
$ nix-env --set-flag priority 10 gcc
|
||
```
|
||
|