A worker system may have obs-worker installed, but because /usr/bin/build is transferred from obsrepserver, the dependencies of obs-build are not carried over. KVM builds thus fail complaining about absence of mkfs.ext4, mkfs.xfs or the hostname utility (especially if one used zypper in --no-recommends obs-worker, but that's another story).
A worker system may have obs-worker installed, but because /usr/bin/build is transferred from obsrepserver, the dependencies of obs-build are not carried over. KVM builds thus fail complaining about absence of mkfs.ext4, mkfs.xfs or the hostname utility (especially if one used zypper in --no-recommends obs-worker, but that's another story).