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Description of problem:
scriptlet can fail if hostname is not installed

Version-Release number of selected component (if applicable):
postfix-3.3.1-8.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. remove hostname and yum install ...
or
1. yum install --installroot /tmp/mastambugu postfix

Actual results:
  Running scriptlet: postfix-2:3.3.1-8.el8.x86_64                       188/205
  Installing       : postfix-2:3.3.1-8.el8.x86_64                       188/205
  Running scriptlet: postfix-2:3.3.1-8.el8.x86_64                       188/205
/var/tmp/rpm-tmp.QAYfr0: line 47: hostname: command not found

Expected results:
no install failure in minimum installation

Additional info:
rhel7 does not use 'hostname' cmd:
postfix-2.10.1-7.el7.x86_64: rpm -q --scripts postfix | grep hostname
===> adding regression

Fix is simple, just by adding requirements.

Created attachment 1618980 [details]
Proposed fix

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-2020:1816