Lennart Poettering
75f8173247
@brauner noticed that in invoked containers the root directory is set to still receive mounts from the host. We should disable that, and guarantee we live in our own world, because that's what an (nspawn-style) container *is* after all: a whole new world. This hence mounts the container subtree to MS_PRIVATE after getting the root dir in place. Note that this will later be set to MS_SHARED again. The MS_PRIVATE disconnects mounts from the host, the MS_SHARED then establishes a new peer group for mount propagation events, so that payload service managers (such as systemd) can take benefit of propagation further down the tree.
System and Service Manager
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