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docs: Add some examples to fetchGit

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This commit is contained in:
Graham Christensen 2018-08-31 09:32:59 -04:00
parent c0c31b58a4
commit 2df21b78b9
1 changed files with 87 additions and 2 deletions
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89
doc/manual/expressions/builtins.xml
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@ -398,6 +398,91 @@ stdenv.mkDerivation { … }
</listitem>
</varlistentry>
</variablelist>
<example>
<title>Fetching a private repository over SSH</title>
<programlisting>builtins.fetchGit {
url = "ssh://git@github.com/my-secret/repository.git";
ref = "master";
rev = "adab8b916a45068c044658c4158d81878f9ed1c3";
}</programlisting>
<note><para>
Note the URL format is not the same as <command>git
clone</command>. <function>builtins.fetchGit</function> uses
a <literal>/</literal> instead of a <literal>:</literal>
between <literal>github.com</literal> and
<literal>my-secret</literal>.</para></note>
</example>
<example>
<title>Fetching a repository's specific commit on an arbitrary branch</title>
<para>
If the revision you're looking for is in the default branch
of the gift repository you don't strictly need to specify
the branch name in the <varname>ref</varname> attribute.
</para>
<para>
However, if the revision you're looking for is in a future
branch for the non-default branch you will need to specify
the the <varname>ref</varname> attribute as well.
</para>
<programlisting>builtins.fetchGit {
url = "https://github.com/nixos/nix.git";
rev = "841fcbd04755c7a2865c51c1e2d3b045976b7452";
ref = "1.11-maintenance";
}</programlisting>
<note>
<para>
It is nice to always specify the branch which a revision
belongs to. Without the branch being specified, the
fetcher might fail if the default branch changes.
Additionally, it can be confusing to try a commit from a
non-default branch and see the fetch fail. If the branch
is specified the fault is much more obvious.
</para>
</note>
</example>
<example>
<title>Fetching a repository's specific commit on the default branch</title>
<para>
If the revision you're looking for is in the default branch
of the gift repository you may omit the
<varname>ref</varname> attribute.
</para>
<programlisting>builtins.fetchGit {
url = "https://github.com/nixos/nix.git";
rev = "841fcbd04755c7a2865c51c1e2d3b045976b7452";
}</programlisting>
</example>
<example>
<title>Fetching a tag</title>
<programlisting>builtins.fetchGit {
url = "https://github.com/nixos/nix.git";
ref = "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>
<title>Fetching the latest version of a remote branch</title>
<para>
<function>builtins.fetchGit</function> can behave impurely
fetch the latest version of a remote branch.
</para>
<note><para>Nix will refetch the branch in accordance to
<option>tarball-ttl</option>.</para></note>
<note><para>This behavior is disabled in
<emphasis>Pure evaluation mode</emphasis>.</para></note>
<programlisting>builtins.fetchGit {
url = "ssh://git@github.com/nixos/nix.git";
ref = "master";
}</programlisting>
</example>
</listitem>
</varlistentry>
@ -1244,8 +1329,8 @@ in foo</programlisting>
This is not allowed because it would cause a cyclic dependency in
the computation of the cryptographic hashes for
<varname>foo</varname> and <varname>bar</varname>.</para>
<para>It is also not possible to reference the result of a derivation.
If you are using Nixpkgs, the <literal>writeTextFile</literal> function is able to
<para>It is also not possible to reference the result of a derivation.
If you are using Nixpkgs, the <literal>writeTextFile</literal> function is able to
do that.</para></listitem>
</varlistentry>