docs: Use the explicit ref for fetchGit with a tag

With the merge of #2582, the syntax "tags/1.9" for refs does not work
anymore.
However, the new syntax "refs/tags/1.9" seems to support annotated tags,
such as "refs/tags/2.0".

Closes #2385.

(cherry picked from commit ae244af242ca3621e5a3b9196f27d9fcbf297266)
This commit is contained in:
Julien Tanguy 2019-09-11 14:18:47 +02:00 committed by Eelco Dolstra
parent 62d1c60fb3
commit ceddbc921f
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@ -487,11 +487,8 @@ stdenv.mkDerivation { … }
<title>Fetching a tag</title>
<programlisting>builtins.fetchGit {
url = "https://github.com/nixos/nix.git";
ref = "tags/1.9";
ref = "refs/tags/1.9";
}</programlisting>
<note><para>Due to a bug (<link
xlink:href="https://github.com/NixOS/nix/issues/2385">#2385</link>),
only non-annotated tags can be fetched.</para></note>
</example>
<example>