FAQ: Difference between revisions

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<syntaxhighlight lang="bash">nix-instantiate --find-file nixpkgs</syntaxhighlight>

To know the commit, open the .version-suffix file in the nixpkgs location. The hash after the dot is the git commit.

~~<!-- FIXME: Needs a rewrite. This sort of dangerous crap of mounting /nix/store rw and modifying files there must NOT be suggested.~~

== An error occurs while fetching sources from an url, how do I fix it? ==

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Be sure to [https://github.com/NixOS/nixpkgs/issues report the incorrect url] or [https://github.com/NixOS/nixpkgs/pulls fix it yourself].

~~-->~~

== How do I know the sha256 to use with fetchgit/fetchsvn/fetchbzr/fetchcvs? ==

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<syntaxhighlight lang="bash">nixos-rebuild switch --option binary-caches ""</syntaxhighlight>

== How do I enable ~~chrooted~~ builds on non-NixOS? ==

== How do I enable sandboxed builds on non-NixOS? ==

Two options have to be added to make ~~chrooted~~ builds work on Nix, ''build-use-~~chroot~~'' and ''build-~~chroot~~-~~dirs~~'':

Two options have to be added to make sandboxed builds work on Nix, ''build-use-sandbox'' and ''build-sandbox-paths'':

~~~~

# /etc/nix/nix.conf

build-use-~~chroot~~ = true

build-use-sandbox = true

build-~~chroot~~-~~dirs~~ = $(nix-store -qR $(nix-build '<nixpkgs>' -A bash) | xargs echo /bin/sh=$(nix-build '<nixpkgs>' -A bash)/bin/bash)

build-sandbox-paths = $(nix-store -qR $(nix-build '<nixpkgs>' -A bash) | xargs echo /bin/sh=$(nix-build '<nixpkgs>' -A bash)/bin/bash)

</syntaxhighlight>

On NixOS set the following in ''configuration.nix'':

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nix.useSandbox = true;

</syntaxhighlight>

See [[Nix Package Manager#Sandbox_builds]] for more details.

== I cannot find $package when running <code>nix-env -qaP</code> even with channels configured ==

@@ Line 227: / Line 227: @@
 <syntaxhighlight lang="bash">nix-instantiate --find-file nixpkgs</syntaxhighlight>
 To know the commit, open the .version-suffix file in the nixpkgs location. The hash after the dot is the git commit.
-<!-- FIXME: Needs a rewrite. This sort of dangerous crap of mounting /nix/store rw and modifying files there must NOT be suggested.
 == An error occurs while fetching sources from an url, how do I fix it? ==
@@ Line 252: / Line 250: @@
 Be sure to [https://github.com/NixOS/nixpkgs/issues report the incorrect url] or [https://github.com/NixOS/nixpkgs/pulls fix it yourself].
--->
 == How do I know the sha256 to use with fetchgit/fetchsvn/fetchbzr/fetchcvs? ==
@@ Line 275: / Line 272: @@
 <syntaxhighlight lang="bash">nixos-rebuild switch --option binary-caches ""</syntaxhighlight>
-== How do I enable chrooted builds on non-NixOS? ==
+== How do I enable sandboxed builds on non-NixOS? ==
-Two options have to be added to make chrooted builds work on Nix, ''build-use-chroot'' and ''build-chroot-dirs'':
+Two options have to be added to make sandboxed builds work on Nix, ''build-use-sandbox'' and ''build-sandbox-paths'':
-<!-- TODO: WTF is the build-chroot-dirs doing here??? -->
 <syntaxhighlight lang="nix">
 # /etc/nix/nix.conf
-build-use-chroot = true
+build-use-sandbox = true
-build-chroot-dirs = $(nix-store -qR $(nix-build '<nixpkgs>' -A bash) | xargs echo /bin/sh=$(nix-build '<nixpkgs>' -A bash)/bin/bash)
+build-sandbox-paths = $(nix-store -qR $(nix-build '<nixpkgs>' -A bash) | xargs echo /bin/sh=$(nix-build '<nixpkgs>' -A bash)/bin/bash)
 </syntaxhighlight>
 On NixOS set the following in ''configuration.nix'':
@@ Line 290: / Line 286: @@
 nix.useSandbox = true;
 </syntaxhighlight>
+See [[Nix Package Manager#Sandbox_builds]] for more details.
 == I cannot find $package when running <code>nix-env -qaP</code> even with channels configured ==