$ git clone -n https://src.fedoraproject.org/rpms/dtc.git /var/lib/mock/f41-build-813516-148684/root/chroot_tmpdir/scmroot/dtc
Cloning into '/var/lib/mock/f41-build-813516-148684/root/chroot_tmpdir/scmroot/dtc'...
$ git fetch origin 37267d8408763ebd0ed5a77c91350aa4b9b7a4e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dtc
 * [new ref]         37267d8408763ebd0ed5a77c91350aa4b9b7a4e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37267d8 - use distro flags to compile the python extension