[chef] How can I add/delete temporary users?

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I'm using the users cookbook to create users and distribute ssh keys.  I've 
now
been tasked with automating the creation/deletion of users who only need
temporary access to servers.  For example when a developer is needed to assist
with issues on a production server.  For auditing purposes we're wanting to
drive it via Git -> Chef.  I'm thinking I could search for local users within 
a
UID range, compare that with what Chef expects and delete accounts for those
that shouldn't be there.

Has anyone solved this or similar scenarios?