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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta http-equiv="Content-Style-Type" content="text/css">
<meta name="id" content=
"$Id: RpmSpec.html 1990 2011-03-03 18:52:40Z elliott_c $">
<link rel="STYLESHEET" href="MakeProjectCreator.css" charset="ISO-8859-1"
type="text/css">
<title>MPC: RpmSpec Type</title>
</head>
<body>
<div>
<h1 class="Head1">RpmSpec Type documentation</h1>
<div>
<h3 class="Head2">Background/Abstract</h3>
<ul>
<li class="body">The <em>RpmSpec Type</em> generates
<samp>.spec</samp> files suitable for use by the <samp><a
href="http://docs.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/html/RPM_Guide/ch-rpmbuild.html">rpmbuild</a></samp>
utility to build and package. It additionally creates a Bourne
shell script that automates creation of source tarball and proper
dependency-order building/packaging of <samp>.spec</samp> files.
</li>
<li class="body">The RpmSpec type refines the existing
<em>aggregated workspace</em> MPC concept, as well as introduces
the ability to have <samp>specific</samp> clauses inside
workspace declarations (<samp>.mwc</samp> files). Consequently,
workspace files utilizing these new features are not
backwards-compatible with prior releases of MPC.</li>
<li class="body">Since RPM is primarily Linux-based, RpmSpec only
officially supports use on Linux-based systems. It <em>may</em>
work on platforms for which an RPM port exists, but such success
would be coincidental and neither intended, tested, nor
guaranteed.</li>
</ul>
</div>
<div>
<h3 class="Head2">Pre-requisites</h3>
<ul>
<li class="body">The following software items are required and
in the execution path (as well as any of their respective dependencies):
<dl>
<dt>RPM</dt>
<dd>Minimum of version 4.7.1 recommended (not tested with
other versions).</dd>
<dt>Development toolchain</dt>
<dd>This can be the standard development toolchain. Packaging
for other architectures is supported if the toolchain in the path
is a cross-compiler for that architecture.</dd>
</dl>
</ul>
</div>
<div>
<h3 class="Head2">Usage</h3>
The RpmSpec type refines an existing concept in MPC known as
<em><a
href="MakeProjectCreator.html#AggregatedWorkspace">aggregate
workspaces</a></em> to define package scopes. When
<code>mwc.pl</code> is run on a top-level workspace with
<code>-type rpmspec</code>, each aggregated workspace is presumed
to define the scope of a package that will become an RPM.
Inter-project dependencies that exist between any projects known to
the top-level workspace automatically turn into inter-package
dependencies in RPMs.
<h4>Generic workflow</h4>
<div align="center">
<img src="rpmworkflow.png" alt="rpm workflow"/>
<h6 align="center">Figure: RPM Workflow</h6>
</div>
Presuming <code>.mwc</code> files already exist, and that
inter-project dependencies are complete and well-formed (i.e.,
contain sufficient <samp>after</samp> statements to insure proper
build ordering):
<ol>
<li>Use the command <samp>mwc.pl -type rpmspec <em>top-level-workspace.mwc</em></samp> to generate
<code>.spec</code> files and <samp>*_rpm.sh</samp> builder script.</li>
<li>Run the <code><em>top-level-workspace</em>_rpm.sh</code>
script to build/package.</li>
</ol>
</div>
<div>
<h3 class="Head2">Adapting/Writing Projects for Packaging</h3>
<h4><a name="mwcnotes"></a>Creating Workspaces</h4>
<p>The RpmSpec type uses <a
href="MakeProjectCreator.html#AggregatedWorkspace">aggregate
workspaces</a> to define the scope of a package. In other words,
defining a package involves writing a <samp>.mwc</samp> file that
includes all the projects that should go into that package.
An additional <samp>.mwc</samp> file must be written for each
additional package. Finally, these <em>package</em> workspaces get
aggregated into a workspace.
<p>RPM packages require extra information not needed by "normal"
MPC projects or workspaces. This information is defined in a
<samp>specific</samp> clause in the workspace for the
<samp>rpmspec</samp> type, e.g.,
<pre class="codeexample">
// top-level workspace
workspace {
specific (rpmspec) {
rpm_version = 1.0
rpm_release = 1
}
package1.mwc
package2.mwc
}
</pre>
Details on the variables allowed in the <samp>specific</samp>
clause can be found in the <a href="../templates/rpmspec.txt">
<samp>$MPC_ROOT/docs/templates/rpmspec.txt</samp></a> file.
<p>If you use workspaces as a part of
building right now, you may wish to write additional
workspace files specifically for packaging via RPM.
<h4><a name="installready"></a>Making Projects
<em>Install-Ready</em></h4>
MPC-assisted packaging requires some attention from the developer
in order to yield its full potential. What this means is that in
order for a project to avail itself to be packaged, it must take
care to insure that any collateral (such as files) that it needs to
end up in the package get installed via MPC's <em>install</em> feature.
Note that this feature is currently only implemented within the
<samp>gnuace</samp> project type.
Typically, this involves inheriting from the <samp>install</samp>
base project in order to enable auto-generation of installation
rules in the makefiles. MPC defaults to making educated guesses as
to what files should be installed (e.g., for an <samp>exe</samp>
project, it figures that the executable should be installed), but a
developer can augment or replace MPC's guesses using
<samp>Install*_Files</samp> groupings. See the documentation on
the <samp>gnuace</samp> installation feature for details.
</div>
</div>
<div>
<h3 class="Head2">Notes</h3>
<h4><a name="rpmnotes"></a>Notes on Generated RPMs</h4>
<ol>
<li>RPMs are relocatable using the <code>--prefix</code> or
<code>--relocate</code> options to <code>rpm</code>.</li>
<li>The RpmSpec type has no control over where the RPM system performs
it's "work" (building, staging,
packaging, etc.). In the
past, this was often <samp>/usr/src/redhat</samp>, though your
system may be configured differently.<br/><samp>rpmbuild</samp>
holds this directory in its <em>_topdir</em> configuration
variable. To see the value of <em>_topdir</em> on
your system, execute the following command:<br/>
<pre class="codeexample">
<b>$ rpmbuild --showrc | grep '_topdir[^}]'</b>
-14: _topdir %{getenv:HOME}/rpmbuild
</pre>
</li>
<li>Binary RPMs land in <samp><em>_topdir</em>/RPMS</samp>.</li>
<li>Source RPMs land in <samp><em>_topdir</em>/SRPMS</samp>.</li>
</ol>
<h4><a name="scriptnotes"></a>Notes on Generated Script</h4>
<ol>
<li>The script takes one optional argument
indicating the architecture for which it should create packages.
The script makes no attempt to "find" a toolchain for that
architecture, instead presuming that whatever toolchain is
needed can be found in the PATH or is specified in the
<code>.spec</code> file.</li>
<li>The script performs a build/install activity for each package.
Installation is not into the running system, but rather into a
"fake" area. Installation is necessary to satisfy inter-package
dependency requirements.<br/>The location of the "fake" area
defaults to <samp>/tmp/mpcrpm</samp> but can be changed by setting the
<samp><%rpm_mpc_temp%></samp> in a workspace
<samp>specific</samp> clause, typically in the top-level
workspace.</li>
</ol>
</div>
<hr>
<!-- hhmts start --> Last modified: Fri Jan 14 09:09:04 CST 2011 <!-- hhmts end -->
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