Christian Brauner
e79581ddfe
Before we supported pivot_root() nspawn used to make the rootfs shared before setting up the mount tunnel. So it was safe for it to just turn it into a dependent mount during setup. However, we cannot do this anymore because of the requirements pivot_root() has. After the pivot_root() we will make the rootfs shared recursively. If we turned the mount tunnel into dependent mount before mount_switch_root() this will have the consequence that it becomes a shared mount within the same peer group as the rootfs. So no mounts will propagate into the container from the host anymore. To fix this we split setting up the mount tunnel and making it active into two steps. Setting up the mount tunnel is performed before mount_switch_root() and activating it afterwards. Note that this works because turning a shared mount into a shared mount is a nop. IOW, no new peer group will be allocated. Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
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