logging mount assembly and bootloader install, chroot missing?

The program.log shows mount commands for assembly, followed by
installation itself copying files to a path prefix /mnt/sysimage, and
then bootloader setup. Isn't there a chroot happening before the
bootloader setup? It's not in the log so I'm having some difficulty
exactly replicating an installation environment while troubleshooting
this bug:

So the questions are:
Is there a chroot?
Is there a way to discover the command being used?
And if there is a chroot, is there a way to log this command in the future?


https://bugzilla.redhat.com/show_bug.cgi?id=1289752


Thanks,


-- 
Chris Murphy