After I perform a standard installation that includes also the pattern:
  KVM Host Server
I found this error in /var/log/zypp/history:

# 2017-05-19 12:31:09 lomoco-1.0-130.1.x86_64.rpm installed ok
# Additional rpm output:
# Updating /etc/sysconfig/logitech_mouse...
# /var/tmp/rpm-tmp.oEOuj8: line 12: mkdir: command not found
# /var/tmp/rpm-tmp.oEOuj8: line 13: touch: command not found
#       fillup: Exception in ../SRC/services.c, line 348 concerning file not
opened
# 
2017-05-19
12:31:09|install|lomoco|1.0-130.1|x86_64||openSUSE-Leap-42.3-0|06c59d06866f6549fde1d8f9382d621b86366a96|

The problem is that lomoco is installed before coreutils and at that time the
binaries mkdir and touch used in the postinstall scriptlet, are not available
yet.

A possible fix is to add this line in lomoco.spec:

Requires(post): coreutils