NXO2ZIBUSCY5RSM6IFVU2PDHM3X66F3TH6PI6DSJGUQ3DTBJEWRAC
<listitem>it uses the GNU Build System, namely GNU Autoconf,
and GNU Automake; for users, it means it can be installed
using the <link
xlink:href="http://www.gnu.org/prep/standards/html_node/Managing-Releases.html">usual
<literal>./configure && make install</literal>
procedure</link>;
</listitem>
<listitem>it uses Gettext for internationalization;</listitem>
<listitem>it has a Texinfo manual, which can be rendered as PDF
with TeX.</listitem>
<listitem>it uses the GNU Build System, namely GNU Autoconf,
and GNU Automake; for users, it means it can be installed
using the <link
xlink:href="http://www.gnu.org/prep/standards/html_node/Managing-Releases.html">usual
<literal>./configure && make install</literal>
procedure</link>;
</listitem>
<listitem>it uses Gettext for internationalization;</listitem>
<listitem>it has a Texinfo manual, which can be rendered as PDF
with TeX.</listitem>
<callout arearefs='ex-hello-co-nixpkgs'>
<para>
This specifies a function of one named arguments,
<varname>nixpkgs</varname>. This function and those
defined below is called by Hydra. Here the
<varname>nixpkgs</varname> argument is meant to be a
checkout of the <link
xlink:href="http://nixos.org/nixpkgs/">Nixpkgs</link>
software distribution.
</para>
<para>
Hydra inspects the formal argument list of the function
(here, the <varname>nixpkgs</varname> argument) and passes
it the corresponding parameter specified as a build input
on Hydra's web interface. In this case, the web interface
should show a <varname>nixpkgs</varname> build input,
which is a checkout of the Nixpkgs source code repository.
</para>
</callout>
<callout arearefs='ex-hello-co-import-nixpkgs'>
<para>
This defines a variable <varname>pkgs</varname> holding
the set of packages provided by Nixpkgs.
</para>
</callout>
<callout arearefs='ex-hello-co-nixpkgs'>
<para>
This specifies a function of one named arguments,
<varname>nixpkgs</varname>. This function and those
defined below is called by Hydra. Here the
<varname>nixpkgs</varname> argument is meant to be a
checkout of the <link
xlink:href="http://nixos.org/nixpkgs/">Nixpkgs</link>
software distribution.
</para>
<para>
Hydra inspects the formal argument list of the function
(here, the <varname>nixpkgs</varname> argument) and passes
it the corresponding parameter specified as a build input
on Hydra's web interface. In this case, the web interface
should show a <varname>nixpkgs</varname> build input,
which is a checkout of the Nixpkgs source code repository.
</para>
</callout>
<callout arearefs='ex-hello-co-import-nixpkgs'>
<para>
This defines a variable <varname>pkgs</varname> holding
the set of packages provided by Nixpkgs.
</para>
</callout>
<callout arearefs='ex-hello-co-jobs'>
<para>
This defines a variable holding the two Hydra
jobs–an <emphasis>attribute set</emphasis> in Nix.
</para>
</callout>
<callout arearefs='ex-hello-co-jobs'>
<para>
This defines a variable holding the two Hydra
jobs–an <emphasis>attribute set</emphasis> in Nix.
</para>
</callout>
<callout arearefs='ex-hello-co-tarball'>
<para>
This is the definition of the first job, named
<varname>tarball</varname>. The purpose of this job is to
produce a usable source code tarball.
</para>
</callout>
<callout arearefs='ex-hello-co-tarball-args'>
<para>
The <varname>tarball</varname> takes an additional
argument called <varname>helloSrc</varname>. Again, this
argument is passed by Hydra and is meant to be a checkout
of GNU Hello's source code repository.
</para>
</callout>
<callout arearefs='ex-hello-co-source-tarball'>
<para>
The <varname>tarball</varname> job calls the
<varname>sourceTarball</varname> function, which (roughly)
runs <command>autoreconf && ./configure &&
make dist</command> on the checkout. The
<varname>buildInputs</varname> attribute specifies
additional software dependencies for the job.
</para>
</callout>
<callout arearefs='ex-hello-co-tarball'>
<para>
This is the definition of the first job, named
<varname>tarball</varname>. The purpose of this job is to
produce a usable source code tarball.
</para>
</callout>
<callout arearefs='ex-hello-co-tarball-args'>
<para>
The <varname>tarball</varname> takes an additional
argument called <varname>helloSrc</varname>. Again, this
argument is passed by Hydra and is meant to be a checkout
of GNU Hello's source code repository.
</para>
</callout>
<callout arearefs='ex-hello-co-source-tarball'>
<para>
The <varname>tarball</varname> job calls the
<varname>sourceTarball</varname> function, which (roughly)
runs <command>autoreconf && ./configure &&
make dist</command> on the checkout. The
<varname>buildInputs</varname> attribute specifies
additional software dependencies for the job.
</para>
</callout>
<callout arearefs='ex-hello-co-build'>
<para>
This is the definition of the <varname>build</varname>
job, whose purpose is to build Hello from the tarball
produced above.
</para>
</callout>
<callout arearefs='ex-hello-co-build-args'>
<para>
The <varname>build</varname> function takes two additional
parameter: <varname>tarball</varname>, which is meant to
be the result of the <varname>tarball</varname> job, and
<varname>system</varname>, which should be a string
defining the Nix system type–e.g.,
<literal>"x86_64-linux"</literal>.
</para>
<para>
Again, these parameters are passed by Hydra when it calls
<varname>build</varname>. Thus, they must be defined as
build inputs in Hydra: <varname>tarball</varname> should
have type <literal>Build Output</literal>, its value being
the latest output of the <varname>tarball</varname> job,
and <varname>system</varname> should be a string.
</para>
<para>
The question mark after <literal>tarball</literal> and
<literal>system</literal> defines default values for these
arguments, and is only useful for debugging.
</para>
</callout>
<callout arearefs='ex-hello-co-nix-build'>
<para>
The <varname>build</varname> job calls the
<varname>nixBuild</varname> function, which unpacks the
tarball, then runs <command>./configure && make
&& make check && make install</command>.
</para>
</callout>
<callout arearefs='ex-hello-co-build'>
<para>
This is the definition of the <varname>build</varname>
job, whose purpose is to build Hello from the tarball
produced above.
</para>
</callout>
<callout arearefs='ex-hello-co-build-args'>
<para>
The <varname>build</varname> function takes two additional
parameter: <varname>tarball</varname>, which is meant to
be the result of the <varname>tarball</varname> job, and
<varname>system</varname>, which should be a string
defining the Nix system type–e.g.,
<literal>"x86_64-linux"</literal>.
</para>
<para>
Again, these parameters are passed by Hydra when it calls
<varname>build</varname>. Thus, they must be defined as
build inputs in Hydra: <varname>tarball</varname> should
have type <literal>Build Output</literal>, its value being
the latest output of the <varname>tarball</varname> job,
and <varname>system</varname> should be a string.
</para>
<para>
The question mark after <literal>tarball</literal> and
<literal>system</literal> defines default values for these
arguments, and is only useful for debugging.
</para>
</callout>
<callout arearefs='ex-hello-co-nix-build'>
<para>
The <varname>build</varname> job calls the
<varname>nixBuild</varname> function, which unpacks the
tarball, then runs <command>./configure && make
&& make check && make install</command>.
</para>
</callout>
<callout arearefs='ex-hello-co-body'>
<para>
Finally, the set of jobs is returned to Hydra, as a Nix
attribute set.
</para>
</callout>
<callout arearefs='ex-hello-co-body'>
<para>
Finally, the set of jobs is returned to Hydra, as a Nix
attribute set.
</para>
</callout>
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