central system user registry
Once upon a time all systems users were defined in aaa_base via the default
/etc/passwd file. When the uid space below uid 100 got too small a new dynamic
range between 100 and 499 was introduced. So nowadays packages dynamically
create a user in %pre which gets a random uid in this range.
Disadvantage: uids are different on every system. Usually this is
not a problem but for programs that export files over the network it
is. TV recordings made by VDR for example.
useradd has a --preferred-uid option for such cases. It's possible
to specify a uid and useradd tries to use it. If it's already taken
another one is chosen.
Thefore I'd propose to leverage that feature:
- introduce a central uid registry for system users, e.g a file in aaa_base
- lower SYSTEM_UID_MAX (/etc/login.defs) to e.g. 349 and assign
"preferred uids" in the rage 350-499.
- change useradd calls in packages to a macro that transparently
decides whether a preferred uid needs to be used.
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Set release notes
- two systems running vdr, one for recording, the other one for playback on a TV want to share recordings via nfs.
- avoid packagers picking too generic user names
- stable uids across appliances
Last change: 2 weeks ago