Init commit.

CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.20)
+project(build_info_getter)
+
+find_package(ament_cmake REQUIRED)
+
+add_custom_target(build_info ALL)
+add_custom_command(TARGET build_info
+                   POST_BUILD
+                   COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/run.py --install-path ${CMAKE_INSTALL_PREFIX}/share/${PROJECT_NAME}
+                   WORKING_DIRECTORY ${CMAKE_CURRENT_SOURE_DIR}
+)
+
+ament_package()

package.xml

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+<?xml version="1.0"?>
+<?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
+<package format="2">
+  <name>build_info_getter</name>
+  <version>0.0.1</version>
+  <description>TODO</description>
+  <license>MPL 2.0</license>
+  <author email="jpace121@gmail.com">James Pace</author>
+  <maintainer email="jpace121@gmail.com">James Pace</maintainer>
+
+  <buildtool_depend>ament_cmake</buildtool_depend>
+
+  <export>
+    <build_type>ament_cmake</build_type>
+  </export>
+</package>

run.py

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+#!/usr/bin/env python3
+import argparse
+import os
+from pathlib import Path
+import subprocess
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--install-path", type=str)
+    parser.add_argument("--project-dir", type=str, default=None)
+    args = parser.parse_args()
+
+    project_directory = args.project_dir
+    if not project_directory:
+        # Assume we're being called from colcon and need to figure this out ourselves.
+        # When run by colcon cwd is something like <path i want>/build/package_name
+        cwd = Path(os.getcwd())
+        project_directory = cwd.parent.parent
+
+    # Where we're going to save the output.
+    output_file = args.install_path + "/project_state.repos"
+
+    # Now call vcs.
+    vcs_command = "vcs export {} > {}".format(project_directory, output_file)
+    subprocess.run(vcs_command, shell=True)
+
+if __name__ == "__main__":
+    main()