example with ros noetic & robotpkg: environment

ros-noetic-robotpkg.def

 Bootstrap: docker
 From: ubuntu:20.04
 
+%environment
+    export GIT_SUBMODULE_STRATEGY=recursive
+    export CTEST_OUTPUT_ON_FAILURE=1
+    export CTEST_PARALLEL_LEVEL=4
+    export ROS_DISTRO=noetic
+    export ROS_PREFIX=/opt/ros/${ROS_DISTRO}
+    export ROS_ETC_DIR=${ROS_PREFIX}/etc/ros
+    export ROS_MASTER_URI=http://localhost:11311
+    export ROS_PACKAGE_PATH=${ROS_PREFIX}/share
+    export ROS_ROOT=${ROS_PREFIX}/share/ros
+    export ROS_VERSION=1
+    export PATH=${ROS_PREFIX}/bin:${PATH}
+    export CMAKE_PREFIX_PATH=${ROS_PREFIX}
+    export LD_LIBRARY_PATH=${ROS_PREFIX}/lib:${ROS_PREFIX}/lib/x86_64-linux-gnu
+    export PKG_CONFIG_PATH=${ROS_PREFIX}/lib/pkgconfig:${ROS_PREFIX}/lib/x86_64-linux-gnu/pkgconfig
+    export ROBOTPKG_BASE=/opt/openrobots
+    export CMAKE_PREFIX_PATH=$ROBOTPKG_BASE:$CMAKE_PREFIX_PATH
+    export LD_LIBRARY_PATH=$ROBOTPKG_BASE/lib:$LD_LIBRARY_PATH
+    export PATH=$ROBOTPKG_BASE/bin:$ROBOTPKG_BASE/sbin:$PATH
+    export PKG_CONFIG_PATH=$ROBOTPKG_BASE/lib/pkgconfig:$PKG_CONFIG_PATH
+    export ROS_PACKAGE_PATH=$ROBOTPKG_BASE/share:$ROS_PACKAGE_PATH
+
 %post
     apt update
     DEBIAN_FRONTEND=noninteractive apt install -qy wget