rootless: overlay mounts broken with 1.19

[jamescassell]

Description

Rootless overlay mounts broke for buildah 1.19 and podman 3.0.

Steps to reproduce the issue:

user1@localhost ~]$ c=$(buildah from --pull=false -v /var/cache/dnf:/var/cache/dnf:O ubi8)
[user1@localhost ~]$ buildah run $c bash --login
2021-03-02T17:08:24.000472807Z: invalid mount type for ``
error running container: error creating container for [/usr/bin/bash --login]: : exit status 1
error while running runtime: exit status 1
ERRO exit status 1

podman broken:

[user1@localhost mybtrfs]$ podman run -it --rm -v /var/cache/dnf:/var/cache/dnf:O ubi8
Error: OCI runtime error: invalid mount type for ``

Describe the results you received:

Describe the results you expected:
works w/ buildah 1.18 or podman 2.2.1

Output of rpm -q buildah or apt list buildah:

$ rpm -q buildah podman
buildah-1.19.6-2.fc33.x86_64
podman-3.0.1-1.fc33.x86_64

Output of buildah version:

(paste your output here)

Output of podman version if reporting a podman build issue:

(paste your output here)

Output of cat /etc/*release:

(paste your output here)

Output of uname -a:

(paste your output here)

Output of cat /etc/containers/storage.conf:

(paste your output here)

[TomSweeneyRedHat]

@giuseppe PTAL

[giuseppe]

closing as it seems to be fixed upstream both for buildah and podman