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This bug is created as a clone of upstream ticket:
https://pagure.io/freeipa/issue/2018

Linux defines MAXHOSTNAMELEN AS 64, we need to honor that. gethostname(2), unode(2), hostname(1) all enforce this limit.

This is limited now to 255 in the host plugin.

This BZ in action: https://bugzilla.redhat.com/show_bug.cgi?id=1703150

Fixed upstream
master:
https://pagure.io/freeipa/c/6662e99e173a16059271528e1fa58e37a3028924

Fixed upstream
ipa-4-7:
https://pagure.io/freeipa/c/319b920e19bafab9e2c1555969c11bbf133707e6

Test implemented in master:

    [8ce0e6b](https://pagure.io/freeipa/c/8ce0e6bf6065e8d08cee7e924eda05174d26d883)  ipatests: add tests for ipa host-add with non-default maxhostnamelength

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3348