Lennart Poettering
fa8b70f2c8
This is establish the basic concepts for #35685, in the hope to get this merged first. This defines a special, fixed 64K UID range that is supposed to be used by directory container images on disk, that is mapped to a dynamic UID range at runtime (via idmapped mounts). This enables a world where each container can run with a dynamic UID range, but this in no way leaks onto the disk, thus making supposedly dynamic, transient UID range assignments persistent. This is infrastructure later used for the primary part of #35685: unpriv container execution with directory images inside user's home dirs, that are assigned to this special "foreign UID range". This PR only defines the ranges, synthesizes NSS records for them via userdb, and then exposes them in a new "systemd-dissect --shift" command that can re-chown a container directory tree into this range (and in fact any range). This comes with docs. But no tests. There are tests in #35685 that cover all this, but they are more comprehensive and also test nspawn's hook-up with this, hence are excluded from this PR.
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