The indoe number of root pid namespace is hardcoded in the kernel to 0xEFFFFFFC since 3.8, so check the inode number of our pid namespace if all else fails. If it's not 0xEFFFFFFC then we are in a pid namespace, hence a container environment. Fixes https://github.com/systemd/systemd/issues/35249 [Reworked by Lennart, to make use of namespace_is_init()]
System and Service Manager
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