only use coman init system for docker images

Author: Panaetius

coman/.config/config.toml

@@ -21,12 +21,14 @@ current_platform = "HPC" # what platform to execute commands on (valid: HPC, ML
 #   environment_file: the path to the edf environment toml file in the cluster
 #   command: the command to run
 #   container_workdir: the working directory inside the container
+#   coman_squash: the path to the coman squash file
+#   coman_init: whether to use coman as an init system for the command. Needed for SSH/Portforwarding. Only work when using a docker container
 sbatch_script_template = """
 #!/bin/bash
 #SBATCH --job-name={{name}}
 #SBATCH --ntasks=1
 #SBATCH --time=10:00:00
-srun {% if environment_file %}--environment={{environment_file}}{% endif %} {% if coman_squash %}/coman/coman exec {% endif %}{{command}}
+srun {% if environment_file %}--environment={{environment_file}}{% endif %} {% if coman_init %}/coman/coman exec {% endif %}{{command}}
 """
 
 # the edf environment toml file template

coman/src/cscs/handlers.rs

@@ -772,7 +772,9 @@ async fn handle_script(
     context.insert("environment_file", &environment_path.to_path_buf());
     context.insert("container_workdir", &workdir);
     if let Some(path) = coman_squash {
-        context.insert("coman_squash", &path);
+        context.insert("coman_squash", &path); // path to coman squash file on remote
+        // whether to use coman as an init system. Only do this if running an image
+        context.insert("coman_init", &options.image.is_some());
     }
     let script = tera.render("script.sh", &context)?;
     api_client
@@ -845,6 +847,9 @@ pub async fn cscs_job_start(
                 let image = image.try_into()?;
                 Some(image)
             } else {
+                println!(
+                    "Warning: No docker image specified (-i), functionality like SSH and port forwarding only works when running a docker image"
+                );
                 None
             };
             let image_meta = if let Some(docker_image) = docker_image {