Excluding a subfolder from bind mount in docker run

docker run has an option to let you mount a host directory or file into a container with --mount=type=bind. This is fine and dandy but what if you need to exclude a subdirectory from you mounted directory or file? Well, there is no built-in option to do exactly that with docker run, but you can override a subdirectory using another --mount=type=bind:

$ mkdir -p thedirectory/thesubdirectory
$ touch thedirectory/thefile.txt
$ touch thedirectory/thesubdirectory/theotherfile.txt
$ docker run \
	--mount="type=bind,src=$PWD,dst=/home/ubuntu" \
	--mount="type=volume,dst=/home/ubuntu/thedirectory/thesubdirectory" \
	ubuntu \
	ls -la /home/ubuntu/thedirectory/thesubdirectory
total 8
drwxr-xr-x 2 root root 4096 Nov  5 09:45 .
drwxr-xr-x 3 root root 4096 Nov  5 09:44 ..

As you can see, the subdirectory content was not mounted into the container. Another way to do this is to create or use an empty directory:

$ mkdir -p thedirectory/thesubdirectory
$ touch thedirectory/thefile.txt
$ touch thedirectory/thesubdirectory/theotherfile.txt
$ mdkir /private/tmp/empty
$ docker run \
	--mount="type=bind,src=$PWD,dst=/home/ubuntu" \
	--mount="type=bind,src=/private/tmp/empty,dst=/home/ubuntu/thedirectory/thesubdirectory" \
	ubuntu \
	ls -la /home/ubuntu/thedirectory/thesubdirectory
total 8
drwxr-xr-x 2 root root 4096 Nov  5 09:45 .
drwxr-xr-x 3 root root 4096 Nov  5 09:44 ..