add docker snippet to setup ros apt repo

add the snapshot repo is the distro is EOL
use the snippet in templates needing it

Signed-off-by: Mikael Arguedas <mikael.arguedas@gmail.com>

docker_templates/templates/docker_images/create_ros_core_image.Dockerfile.em

@@ -24,7 +24,6 @@
 template_dependencies = [
     'dirmngr',
     'gnupg2',
-    'lsb-release',
 ]
 }@
 @(TEMPLATE(
@@ -33,11 +32,13 @@ template_dependencies = [
     upstream_packages=upstream_packages if 'upstream_packages' in locals() else [],
 ))@
 @
-# setup keys
-RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
-
-# setup sources.list
-RUN echo "deb http://packages.ros.org/ros/ubuntu `lsb_release -sc` main" > /etc/apt/sources.list.d/ros-latest.list
+@(TEMPLATE(
+    'snippet/setup_ros_sources.Dockerfile.em',
+    os_name=os_name,
+    os_code_name=os_code_name,
+    rosdistro_name=rosdistro_name,
+    ros_version=ros_version,
+))@
 
 @(TEMPLATE(
     'snippet/install_ros_bootstrap_tools.Dockerfile.em',

docker_templates/templates/docker_images_ros2/create_ros_core_image.Dockerfile.em

@@ -22,7 +22,6 @@
 template_dependencies = [
     'dirmngr',
     'gnupg2',
-    'lsb-release',
 ]
 # add 'python3-pip' to 'template_dependencies' if pip dependencies are declared
 if 'pip3_install' in locals():
@@ -35,11 +34,14 @@ if 'pip3_install' in locals():
     upstream_packages=upstream_packages if 'upstream_packages' in locals() else [],
 ))@
 @
-# setup ros2 keys
-RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654
-
-# setup sources.list
-RUN echo "deb http://packages.ros.org/ros2/ubuntu `lsb_release -sc` main" > /etc/apt/sources.list.d/ros2-latest.list
+@(TEMPLATE(
+    'snippet/setup_ros_sources.Dockerfile.em',
+    os_name=os_name,
+    os_code_name=os_code_name,
+    ros2distro_name=ros2distro_name,
+    rosdistro_name='',
+    ros_version=ros_version,
+))@
 
 @(TEMPLATE(
     'snippet/install_ros_bootstrap_tools.Dockerfile.em',

docker_templates/templates/docker_images_ros2/ros1_bridge/create_ros_ros1_bridge_image.Dockerfile.em

@@ -35,11 +35,13 @@ RUN pip3 install -U \
 @[  end if]@
 @[end if]@
 
-# setup keys
-RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 421C365BD9FF1F717815A3895523BAEEB01FA116
-
-# setup sources.list
-RUN echo "deb http://packages.ros.org/ros/ubuntu `lsb_release -sc` main" > /etc/apt/sources.list.d/ros-latest.list
+@(TEMPLATE(
+    'snippet/setup_ros_sources.Dockerfile.em',
+    os_name=os_name,
+    os_code_name=os_code_name,
+    rosdistro_name=rosdistro_name,
+    ros_version='1',
+))@
 
 ENV ROS1_DISTRO @rosdistro_name
 ENV ROS2_DISTRO @ros2distro_name

docker_templates/templates/snippet/setup_ros_sources.Dockerfile.em

@@ -0,0 +1,25 @@
+@{
+from docker_templates.eol_distro import isDistroEOL
+if int(ros_version) == 2:
+    ros_distro_name = ros2distro_name
+elif int(ros_version) == 1:
+    ros_distro_name = rosdistro_name
+
+if isDistroEOL(ros_distro_name, os_code_name):
+    repo_url = 'http://snapshots.ros.org/' + str(ros_distro_name) + '/final/' + 'ubuntu' + '/'
+    repo_key = 'AD19BAB3CBF125EA'
+    source_suffix = 'snapshots'
+else:
+    repo_key = 'C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654'
+    source_suffix = 'latest'
+
+    if int(ros_version) == 1:
+        repo_url = 'http://packages.ros.org/ros/ubuntu'
+    elif int(ros_version) == 2:
+        repo_url = 'http://packages.ros.org/ros2/ubuntu'
+}@
+# setup keys
+RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys @(repo_key)
+
+# setup sources.list
+RUN echo "deb @(repo_url) @(os_code_name) main" > /etc/apt/sources.list.d/ros@(ros_version)-@(source_suffix).list