mirror of https://github.com/NixOS/nix.dev.git synced 2024-10-18 14:32:43 -04:00

move question on rechecking binary cache to a Nix recipe (#808 )

* mv question -f faqs -t nix-recipes

* add nix-recipes to page index and fix hierarchy

* change question to statement

* rephrase a few sentences and add links

* move the question to troubleshooting

* fix broken link

---------

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>

2023-11-30 16:41:18 +01:00

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Frequently Asked Questions

Nix

How do I add a new binary cache?

Using NixOS (≥ 22.05):

nix.settings = {
  trusted-substituters = [ "https://cache.nixos.org" ];
  substituters = [ "https://cache.nixos.org" ];
};

Using NixOS (≤ 21.11):

nix = {
  trustedBinaryCaches = [ "https://cache.nixos.org" ];
  binaryCaches = [ "https://cache.nixos.org" ];
};

Using Nix:

$ echo "trusted-binary-caches = https://cache.nixos.org" >> /etc/nix/nix.conf
$ nix-build helpers/bench.nix --option extra-binary-caches https://cache.nixos.org

How to operate between Nix paths and strings?

See http://stackoverflow.com/a/43850372

How to build reverse dependencies of a package?

$ nix-shell -p nixpkgs-review --run "nixpkgs-review wip"

How can I manage dotfiles in $HOME with Nix?

See https://github.com/nix-community/home-manager

What's the recommended process for building custom packages?

E.g. if I git clone nixpkgs how do I use the cloned repo to define new / updated packages?

NixOS

How to build my own ISO?

See http://nixos.org/nixos/manual/index.html#sec-building-image

How do I connect to any of the machines in NixOS tests?

Apply following patch:

diff --git a/nixos/lib/test-driver/test-driver.pl b/nixos/lib/test-driver/test-driver.pl
index 8ad0d67..838fbdd 100644
--- a/nixos/lib/test-driver/test-driver.pl
+++ b/nixos/lib/test-driver/test-driver.pl
@@ -34,7 +34,7 @@ foreach my $vlan (split / /, $ENV{VLANS} || "") {
     if ($pid == 0) {
         dup2(fileno($pty->slave), 0);
         dup2(fileno($stdoutW), 1);
-        exec "vde_switch -s $socket" or _exit(1);
+        exec "vde_switch -tap tap0 -s $socket" or _exit(1);
     }
     close $stdoutW;
     print $pty "version\n";

And then the vde_switch network should be accessible locally.

How to bootstrap NixOS inside an existing Linux installation?

There are a couple of tools:

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