$ git clone -n https://src.fedoraproject.org/rpms/rubygem-colorize.git /var/lib/mock/f41-build-700929-12894/root/chroot_tmpdir/scmroot/rubygem-colorize
Cloning into '/var/lib/mock/f41-build-700929-12894/root/chroot_tmpdir/scmroot/rubygem-colorize'...
$ git fetch origin 04b074d1547d81f6df02a9697ab3824b3ff6825e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-colorize
 * [new ref]         04b074d1547d81f6df02a9697ab3824b3ff6825e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04b074d Eliminate use of obsolete %patchN syntax (#2283636)