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dockerTools.buildImage: support impure dates

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Because dates are an impurity, by default buildImage will use a static
date of one second past the UNIX Epoch. This can be a bit frustrating
when listing docker images in the CLI:

    $ docker image list
    REPOSITORY   TAG      IMAGE ID       CREATED        SIZE
    hello        latest   08c791c7846e   48 years ago   25.2MB

If you want to trade the purity for a better user experience, you can
set created to now.

    pkgs.dockerTools.buildImage {
      name = "hello";
      tag = "latest";
      created = "now";
      contents = pkgs.hello;

      config.Cmd = [ "/bin/hello" ];
    }

and now the Docker CLI will display a reasonable date and sort the
images as expected:

    $ docker image list
    REPOSITORY   TAG      IMAGE ID       CREATED              SIZE
    hello        latest   de2bf4786de6   About a minute ago   25.2MB
This commit is contained in:
Graham Christensen
2018-09-20 18:26:02 +02:00
committed by Robin Gloster
parent b0987f2013
commit a32d7e0c74
2 changed files with 52 additions and 6 deletions
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doc/functions.xml
+39
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@@ -638,6 +638,45 @@ buildImage {
<literal>pkgs.cacert</literal> to <varname>contents</varname>.
</para>
</note>
<example xml:id="example-pkgs-dockerTools-buildImage-creation-date">
<title>Impurely Defining a Docker Layer's Creation Date</title>
<para>
Because dates are an impurity, by default
<function>buildImage</function> will use a static date of one
second past the UNIX Epoch. This can be a bit frustrating when
listing docker images in the CLI:
</para>
<screen><![CDATA[
$ docker image list
REPOSITORY TAG IMAGE ID CREATED SIZE
hello latest 08c791c7846e 48 years ago 25.2MB
]]></screen>
<para>
If you want to trade the purity for a better user experience,
you can set <literal>created</literal> to
<literal>now</literal>.
</para>
<programlisting><![CDATA[
pkgs.dockerTools.buildImage {
name = "hello";
tag = "latest";
created = "now";
contents = pkgs.hello;
config.Cmd = [ "/bin/hello" ];
}
]]></programlisting>
<para>
and now the Docker CLI will display a reasonable date and
sort the images as expected:
</para>
<screen><![CDATA[
$ docker image list
REPOSITORY TAG IMAGE ID CREATED SIZE
hello latest de2bf4786de6 About a minute ago 25.2MB
]]></screen>
</example>
</section>
<section xml:id="ssec-pkgs-dockerTools-fetchFromRegistry">