Add script for updating preamble.

devscripts/PREAMBLE.c

@@ -0,0 +1,15 @@
+ * Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
+ * General Public License as public by the Free Software Foundation; version 2.0
+ * or (at your option) any later version. You can redistribute it and/or
+ * modify it under the terms of either of these two licenses.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * You should have received a copy of the licenses; if not, see
+ * <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
+ * and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
+ * License, Version 2.0.

devscripts/PREAMBLE.py

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+# Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
+# General Public License as public by the Free Software Foundation; version 2.0
+# or (at your option) any later version. You can redistribute it and/or
+# modify it under the terms of either of these two licenses.
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# You should have received a copy of the licenses; if not, see
+# <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
+# and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
+# License, Version 2.0.
+#

devscripts/replace-preamble.sh

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+#!/usr/bin/zsh
+perl -i -p0e "s{\Q$(cat PREAMBLE.py.old)\E}{$(cat devscripts/PREAMBLE.py)}g" dulwich/**/*.py bin/dul*
+perl -i -p0e "s{\Q$(cat PREAMBLE.c.old)\E}{$(cat devscripts/PREAMBLE.c)}g" dulwich/*.c