Mount points with spaces lead to an error in combination with fuse-overlayfs

[PhilippWendler]

The following fails:

mkdir "a" "tmp tmp"
sudo mount --bind "a" "tmp tmp"
containerexec bash

The error message is

Failed to configure container with operation 'raise OSError(errno, msg)': [Errno 2] mount(b'/tmp/BenchExec_run_pot4cxqd/overlayfs/fuse_mount/home/wendler/git/benchexec/tmp tmp', b'/tmp/BenchExec_run_pot4cxqd/mount/home/wendler/git/benchexec/tmp tmp', None, 4096, None) failed: No such file or directory

If one switches to the kernel-based overlayfs by passing --read-only-dir / --overlay-dir . it works, so the problem is in our code for handling fuse-overlayfs mounts.

[PhilippWendler]

Same problem for mounts with , in the name.