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release-notes/19.03: add release notes for nix 2.0 requirement bump

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This is taken from the 18.09 change, which was reverted on release-18.09
but not master. The now-false 18.09 release notes were just removed from
master in 29854e2426, but since the
underlying change is still there, release notes for 19.03 are warranted.
This commit takes the now-reverted release notes and reuses them for
that.
This commit is contained in:
John Ericson 2018-09-23 11:50:23 -04:00
parent fe20b58d66
commit 1146ae1a71
1 changed files with 42 additions and 1 deletions
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43
nixos/doc/manual/release-notes/rl-1903.xml
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@ -56,7 +56,48 @@
<itemizedlist>
<listitem>
<para />
<para>
The minimum version of Nix required to evaluate Nixpkgs is now 2.0.
</para>
<itemizedlist>
<listitem>
<para>
For users of NixOS 18.03 and 19.03, NixOS defaults to Nix 2.0, but
supports using Nix 1.11 by setting <literal>nix.package =
pkgs.nix1;</literal>. If this option is set to a Nix 1.11 package, you
will need to either unset the option or upgrade it to Nix 2.0.
</para>
</listitem>
<listitem>
<para>
For users of NixOS 17.09, you will first need to upgrade Nix by setting
<literal>nix.package = pkgs.nixStable2;</literal> and run
<command>nixos-rebuild switch</command> as the <literal>root</literal>
user.
</para>
</listitem>
<listitem>
<para>
For users of a daemon-less Nix installation on Linux or macOS, you can
upgrade Nix by running <command>curl https://nixos.org/nix/install |
sh</command>, or prior to doing a channel update, running
<command>nix-env -iA nix</command>.
</para>
<para>
If you have already run a channel update and Nix is no longer able to
evaluate Nixpkgs, the error message printed should provide adequate
directions for upgrading Nix.
</para>
</listitem>
<listitem>
<para>
For users of the Nix daemon on macOS, you can upgrade Nix by running
<command>sudo -i sh -c 'nix-channel --update &amp;&amp; nix-env -iA
nixpkgs.nix'; sudo launchctl stop org.nixos.nix-daemon; sudo launchctl
start org.nixos.nix-daemon</command>.
</para>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>
</section>