i686 images have been hanging in rawhide composes with: 

https://koji.fedoraproject.org/koji/taskinfo?taskID=20921485

https://kojipkgs.fedoraproject.org//work/tasks/1485/20921485/mock_output.log

...
2017-07-31 13:34:08,444: Installing crypto-policies.noarch (375/1317)
2017-07-31 13:34:08,444: Installing fontconfig.i686 (376/1317)
2017-07-31 13:34:08,444: 
2017-07-31 13:34:08,444: The installation was stopped due to incomplete spokes detected while running in non-interactive cmdline mode. Since there cannot be any questions in cmdline mode, edit your kickstart file and retry installation.
2017-07-31 13:34:08,445: The exact error message is:
2017-07-31 13:34:08,445: 
2017-07-31 13:34:08,445: Non interactive installation failed: DNF error: Non-fatal POSTIN scriptlet failure in rpm package fontconfig.
2017-07-31 13:34:08,445: 
2017-07-31 13:34:08,445: The installer will now terminate.
2017-07-31 13:35:42,251: Failed to preset unit, unit sshd.socket does not exist.
2017-07-31 13:37:37,876: Running in chroot, ignoring request.
2017-07-31 14:38:54,520: Non-fatal POSTIN scriptlet failure in rpm package fontconfig
2017-07-31 14:38:54,520: Non-fatal <unknown> scriptlet failure in rpm package fontconfig
2017-07-31 14:38:54,941: Running anaconda failed: process '['anaconda', '--kickstart', '/tmp/koji-image-f27-build-20921485.ks', '--cmdline', '--dirinstall', '--remotelog', '127.0.0.1:35401']' exited with status 1

note that x86_64 has been working fine, only i686 is doing this. 

Perhaps a post script needs a || : at the end to make sure it always exits 0?