I am attempting to achieve a setup with directories
/foo
/foo/bar
Where /foo/bar is a directory mounted from the local file system but /foo is not. I would like /foo/bar to be read-only, but /foo to be read-write. Is this achievable in Docker?
Well, heck, let's try it.
$ mkdir /tmp/data
$ docker run -it --rm -v /tmp/data:/foo/bar:ro busybox sh
/ # cd /foo
/foo # echo look I can write files here > testfile
/foo # cd bar
/foo/bar # echo but here not so much > testfile
sh: can't create testfile: Read-only file system
So it looks like the answer is, "yes."
