Steps to Reproduce:
osc co openSUSE:Factory/emacs-auctex
cd $_
osc build --clean
# or
osc build --clean --vm-type=kvm

Actual Results:
gets stuck for an hour in an busy loop at the end of build environment setup

pstree -l
shows lines like
bash---osc---sudo---build-+-init_buildsyste---init_buildsyste---rpm---sh---update---perl---kpsewhich

bash---osc---sudo---build-+-init_buildsyste---init_buildsyste---rpm---sh---update---update---tcfmgr---tcfmgr---kpsewhich

with ps ax showing details like
rpm --ignorearch --nodeps -Uh --oldpackage --ignoresize --verbose --nodigest
--nosignature .init_b_cache/manifest
/bin/bash /usr/share/texmf/texconfig/update
perl /usr/bin/updmap --sys --cnffile /etc/texmf/web2c/updmap.cfg --nohash
perl /usr/bin/updmap --sys --cnffile /etc/texmf/web2c/updmap.cfg --nohash
--nomkmap --syncwithtrees

The most details I got out of
strace -s 200 -f -o /tmp/strace -p `pidof rpm`
because it keeps forking off child shell processes


42.3 version is also affected,
https://build.opensuse.org/build/openSUSE:Leap:42.3/standard/x86_64/emacs-auctex/_log 
[  119s]
texlive-ukrhyph-2016.113.svn21081-23.9########################################
[  119s] brp-trim-desktopfiles-12.1-32.1      
########################################
[ 3777s] removing nis flags from //etc/nsswitch.conf...


but 42.2 version is not with at most 50 seconds spend between

[  725s]
texlive-ukrhyph-2015.104.svn21081-21.1########################################
[  725s] brp-trim-desktopfiles-12.1-30.2      
########################################
[  775s] removing nis flags from //etc/nsswitch.conf...