docs: Add example for exporting the source tree

See #969952

diff --git a/docs/manpages/gbp-buildpackage.xml b/docs/manpages/gbp-buildpackage.xml
index 39e0b0bcc44fd4f2153a04af8bea03a9a71f9a28..073f0fb937874d709dfc2155096e3364f785ffe5 100644 (file)
--- a/docs/manpages/gbp-buildpackage.xml
+++ b/docs/manpages/gbp-buildpackage.xml
@@ -816,6 +816,12 @@
     <screen>
       DIST=wheezy ARCH=i386 &git-pbuilder; create
     </screen>
+    <para>
+      To export the source tree without performing any build you can use:
+    </para>
+    <screen>
+      gbp buildpackage --git-export-dir=/where/to/export --git-builder=/bin/true --git-no-pbuilder --git-no-hooks --git-no-purge
+    </screen>
   </refsect1>
   <refsect1>
     &man.gbp.config-files;