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remove the Channels section

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this is a how-to guide which should not be in the reference manual.
it also refers to `nix-env`, which should not be the first thing readers
of the reference manual encounter, as it behaves very differently in
spirit from the rest of Nix.

slightly reword the documentation to be more concise and informative.
This commit is contained in:
Valentin Gagarin 2023-03-05 03:59:17 +01:00
parent a8d5bb5e7e
commit ee72ede389
4 changed files with 41 additions and 82 deletions
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2
doc/manual/src/package-management/basic-package-mgmt.md
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@ -25,7 +25,7 @@ or completely new ones.)
You can manually download the latest version of Nixpkgs from
<https://github.com/NixOS/nixpkgs>. However, it’s much more
convenient to use the Nixpkgs [*channel*](channels.md), since it makes
convenient to use the Nixpkgs [*channel*](../command-ref/nix-channel.md), since it makes
it easy to stay up to date with new versions of Nixpkgs. Nixpkgs is
automatically added to your list of “subscribed” channels when you
install Nix. If this is not the case for some reason, you can add it

50
doc/manual/src/package-management/channels.md
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@ -1,50 +0,0 @@
# Channels
If you want to stay up to date with a set of packages, it’s not very
convenient to manually download the latest set of Nix expressions for
those packages and upgrade using `nix-env`. Fortunately, there’s a
better way: *Nix channels*.
A Nix channel is just a URL that points to a place that contains a set
of Nix expressions and a manifest. Using the command
[`nix-channel`](../command-ref/nix-channel.md) you can automatically
stay up to date with whatever is available at that URL.
To see the list of official NixOS channels, visit
<https://nixos.org/channels>.
You can “subscribe” to a channel using `nix-channel --add`, e.g.,
```console
$ nix-channel --add https://nixos.org/channels/nixpkgs-unstable
```
subscribes you to a channel that always contains that latest version of
the Nix Packages collection. (Subscribing really just means that the URL
is added to the file `~/.nix-channels`, where it is read by subsequent
calls to `nix-channel
--update`.) You can “unsubscribe” using `nix-channel
--remove`:
```console
$ nix-channel --remove nixpkgs
```
To obtain the latest Nix expressions available in a channel, do
```console
$ nix-channel --update
```
This downloads and unpacks the Nix expressions in every channel
(downloaded from `url/nixexprs.tar.bz2`). It also makes the union of
each channel’s Nix expressions available by default to `nix-env`
operations (via the symlink `~/.nix-defexpr/channels`). Consequently,
you can then say
```console
$ nix-env --upgrade
```
to upgrade all packages in your profile to the latest versions available
in the subscribed channels.