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<chapter id="gbp.building">
<title>Building packages from the &git; repository</title>
<para>
In order to build a &debian; package from the &git; repository you use:
&git-buildpackage;. This builds the upstream tarball as will be described below and
invokes &debuild; to build the package. To use another build command you
can use the <option>--git-builder</option> option as described later in the manual
but &debuild; is nice since it can invoke <productname>linda</productname>
und <productname>lintian</productname>.
During the development phase (when you're either not on the
<emphasis>debian-branch</emphasis> or when you have uncommitted changes in
your repository) you'll usually use:
<screen>
&git-buildpackage; <option>--git-ignore-new</option>
</screen>
<para>If &git-buildpackage; doesn't find a valid upstream tarball it will create
one by looking at the tag matching the upstream version, if no tag can be
found it uses the tip of the current <option>upstream-branch</option>. Any
other treeish object to create the upstream tarball from can be given with
the <option>--upstream-branch</option> option.</para>
<para>Once you're satisfied with the build and want to do a release you commit all
your changes and issue:</para>
<screen>
&git-buildpackage; <option>--git-tag</option>
</screen>
<para>This will again build the debian package and tag the final result after
extracting the current version from the changelog. If you want &gpg; signed
tags you can use the <option>--git-sign</option> and
<option>--git-keyid</option> options. To save typing these option can be
specified via the configuration files. You can futhermore change the tag
format used when creating tags with the <option>debian-tag</option>
option, the default is <replaceable>debian/<version></replaceable>.</para>
<sect1 id="gbp.building.export">
<title>Using a separate build dir</title>
<para>Tools like &svn-buildpackage; use a separate build-area. To achieve a similar behaviour
with &git-buildpackage; use the <option>--git-export-dir</option> option:</para>
<screen>
&git-buildpackage; <option>--git-export-dir</option>=<replaceable>../build-area/</replaceable>
</screen>
<para>This will export the current branch head to
<replaceable>../build-area/package-version</replaceable>, check out the corresponding
upstream tree to build the .orig.tar.gz if necessary and build the
package. If you don't want to export the current branch head you can use
<option>--git-export</option> to export any treeish object, here are some
examples:</para>
<screen>
&git-buildpackage; <option>--git-export-dir</option>=<replaceable>../build-area</replaceable> <option>--git-export</option>=<replaceable>debian/0.4.3</replaceable>
&git-buildpackage; <option>--git-export-dir</option>=<replaceable>../build-area</replaceable> <option>--git-export</option>=<replaceable>etch</replaceable>
&git-buildpackage; <option>--git-export-dir</option>=<replaceable>../build-area</replaceable> <option>--git-export</option>=<replaceable>8caed309653d69b7ab440e3d35abc090eb4c6697</replaceable>
</screen>
<para>If you want to default to build in a separate build area you can
specify the directory to use in the gbp.conf.
<programlisting>
[git-buildpackage]
# use a build area relative to the git repository
export-dir=../build-area
# to use the same build area for all packages use an absolute path:
#export-dir=/home/debian-packages/build-area
</programlisting>
</para>
</sect1>
<sect1 id="gbp.building.push">
<title>Pushing into a remote repository</title>
<para>If you want to push your changes automatically after a succesful build and tag
you can use &git-buildpackage;'s posttag hook. A very simple invocation would look like this:
<programlisting>
<command>git-buildpackage</command> <option>--git-tag</option> <option>--git-posttag</option>=<replaceable>"git push && git push --tags"</replaceable>
</programlisting>
This assumes you have set up a remote repository to push to in <filename>.git/config</filename>.
The following hook pushes out the created tag to were you pulled from
and forwards the remote branch to that position:
<programlisting>
#!/bin/sh -e
#
# gbp-push: post tag hook to push out the newly created tag and to forward the
# remote branch to that position
if ! REMOTE=$(git config --get branch."${GBP_BRANCH}".remote); then
REMOTE=origin
fi
if [ "$GBP_TAG" ]; then
echo "Pushing $GBP_TAG to $REMOTE"
git push "$REMOTE" "$GBP_TAG"
else
echo "GBP_TAG no set."
exit 1
fi
if [ "$GBP_SHA1" ] && [ "$GBP_BRANCH" ]; then
git push "$REMOTE" "$GBP_SHA1":"$GBP_BRANCH"
else
echo "GBP_SHA1 or GBP_BRANCH not set."
exit 1
fi
echo "done."
</programlisting>
<replaceable>GBP_TAG</replaceable>, <replaceable>GBP_SHA1</replaceable>
and <replaceable>GBP_BRANCH</replaceable> are passed to the hook via the
environment. To call this hook automatically upon tag creation add:
<programlisting>
<option>posttag</option>=<replaceable>"gbp-push"</replaceable>
</programlisting>
to your <filename>.gbp.conf</filename> and make sure <filename>gbp-push</filename>
is somewhere in your <replaceable>$PATH</replaceable>.
</para>
</sect1>
</chapter>
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