Mount host volume when container is running

[t0msk]

Hello, so long story short, I created my container like:

distrobox create --yes --name devbox --image docker-registry.server.home/devbox --nvidia --additional-flags "--pid=host"

I wanna have access to distrobox features, so I used distrobox for creation.

Basically it is container for development, it contains libraries and SDKs which I need. I use it because I dont wanna fill up my host system with tons of libraries + SDKs, + Im switching to immutable distro in future.

So I trust everything in that container, so I dont care about lower security when using --pid=host, etc, I would say I need it, because dev container should have as much access as possible.

So as you can see I created container mostly with default settings except nvidia support and pid stuff.

But I need sometimes some volumes when working, and every project needs different volumes, so I want to mount to container volumes during runtime somehow.

So I created this script:

#!/bin/bash
# Dynamicky bind mountne host path do bežiaceho podman kontajnera a vytvorí symlink vnútri

set -e

if [ $# -lt 2 ] || [ $# -gt 3 ]; then
  echo "Usage: $0 <container-name> <host-path> [container-path]"
  exit 1
fi

CONTAINER_NAME=$1
HOST_PATH=$2

if [ $# -eq 3 ]; then
  CONTAINER_PATH=$3
else
  CONTAINER_PATH=$HOST_PATH
fi

if [ ! -e "$HOST_PATH" ]; then
  echo "❌ Error: host path '$HOST_PATH' does not exist."
  exit 2
fi

CID=$(podman ps -q -f name="^${CONTAINER_NAME}$")
if [ -z "$CID" ]; then
  echo "❌ Error: container '$CONTAINER_NAME' is not running."
  exit 3
fi

MOUNT_BASE="/tmp/distrobox_mounts/$CID"
MOUNT_PATH="$MOUNT_BASE$CONTAINER_PATH"

echo "📁 Creating mount target on host: $MOUNT_PATH"
podman unshare mkdir -p "$(dirname "$MOUNT_PATH")"

if [ -e "$MOUNT_PATH" ]; then
  echo "ℹ️ Mount path already exists."
else
  if [ -f "$HOST_PATH" ] || [ -S "$HOST_PATH" ]; then
    echo "📄 Creating empty file/socket as mount point: $MOUNT_PATH"
    podman unshare touch "$MOUNT_PATH"
  elif [ -d "$HOST_PATH" ]; then
    echo "📁 Creating directory as mount point: $MOUNT_PATH"
    podman unshare mkdir -p "$MOUNT_PATH"
  else
    echo "❌ Error: '$HOST_PATH' is neither file, socket, nor directory."
    exit 4
  fi
fi

echo "🔗 Bind mounting $HOST_PATH → $MOUNT_PATH"
podman unshare mount --bind "$HOST_PATH" "$MOUNT_PATH"

echo "🔗 Creating symlink inside container from $CONTAINER_PATH → $MOUNT_PATH"
podman exec --user root "$CONTAINER_NAME" mkdir -p "$(dirname "$CONTAINER_PATH")" || true
podman exec --user root "$CONTAINER_NAME" rm -rf "$CONTAINER_PATH" || true
podman exec --user root "$CONTAINER_NAME" ln -s "$MOUNT_PATH" "$CONTAINER_PATH"

echo "✅ Bind mount and symlink successful."

I can call it like pbind /run/dbus//run/dbus/system_bus_socket and it will create mount at /tmp/distrobox_mounts/$CID and then it will symlink to "original" location, it creates mount and symlink, but it is not working (my app in dev container cannot communicate with system_bus_socket).

This is output from host:

ls -l /run/dbus/system_bus_socket
srw-rw-rw- - root  5 Aug 12:02 /run/dbus/system_bus_socket

and this is from container:

ls -l /run/dbus/system_bus_socket
lrwxrwxrwx - root  5 Aug 22:10 /run/dbus/system_bus_socket -> /tmp/distrobox_mounts/13074e3e9251/run/dbus/system_bus_socket

I mean permissions should be alright, because in both cases user has UID 1000 and PID should be shared.
This is only thing which I really really need/want.

Please I would be happy for any solution.
Thank you