waagent: T6475: Added waagent build instructions

We need a version newer than in the Debian repository.

This commit adds instructions to build a version from sid.

packages/waagent/Jenkinsfile

@@ -0,0 +1,32 @@
+// Copyright (C) 2023 VyOS maintainers and contributors
+//
+// This program is free software; you can redistribute it and/or modify
+// in order to easy exprort images built to "external" world
+// it under the terms of the GNU General Public License version 2 or later as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+@NonCPS
+
+// Using a version specifier library, use 'current' branch. The underscore (_)
+// is not a typo! You need this underscore if the line immediately after the
+// @Library annotation is not an import statement!
+@Library('vyos-build@current')_
+
+def package_name = 'waagent'
+def pkgList = [
+    ['name': "${package_name}",
+     'scmCommit': 'debian/2.9.1.1-2',
+     'scmUrl': 'https://salsa.debian.org/cloud-team/waagent.git',
+     'buildCmd': 'sudo mk-build-deps --install --tool "apt-get --yes --no-install-recommends"; sudo apt-get install --yes --no-install-recommends dpkg-source-gitarchive; ../build.py'],
+]
+
+// Start package build using library function from https://github.com/vyos/vyos-build
+buildPackage("${package_name}", pkgList, null, true, "**/packages/waagent/**")

packages/waagent/build.py

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+#!/usr/bin/env python3
+
+from pathlib import Path
+from shutil import copy as copy_file
+from subprocess import run
+
+
+# copy patches
+def apply_deb_patches() -> None:
+    """Apply patches to sources directory
+    """
+    patches_dir = Path('../patches')
+    current_dir: str = Path.cwd().as_posix()
+    if patches_dir.exists():
+        patches_list = list(patches_dir.iterdir())
+        patches_list.sort()
+        Path(f'{current_dir}/debian/patches').mkdir(parents=True, exist_ok=True)
+        series_file = Path(f'{current_dir}/debian/patches/series')
+        series_data = ''
+        for patch_file in patches_list:
+            print(f'Applying patch: {patch_file.name}')
+            copy_file(patch_file, f'{current_dir}/debian/patches/')
+            if series_file.exists():
+                series_data: str = series_file.read_text()
+            series_data = f'{series_data}\n{patch_file.name}'
+            series_file.write_text(series_data)
+
+
+def build_package() -> bool:
+    """Build a package
+
+    Returns:
+        bool: build status
+    """
+    build_cmd: list[str] = ['dpkg-buildpackage', '-uc', '-us', '-tc', '-b']
+    build_status: int = run(build_cmd).returncode
+
+    if build_status:
+        return False
+    return True
+
+
+# build a package
+if __name__ == '__main__':
+    apply_deb_patches()
+
+    if not build_package():
+        exit(1)
+
+    exit()