$ git clone -n https://src.fedoraproject.org/rpms/doxygen.git /var/lib/mock/f41-build-side-1-2634249-26019/root/chroot_tmpdir/scmroot/doxygen
Cloning into '/var/lib/mock/f41-build-side-1-2634249-26019/root/chroot_tmpdir/scmroot/doxygen'...
$ git fetch origin ff81bd65cdb42848634a843b8aa628dc77ffae03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/doxygen
 * [new ref]         ff81bd65cdb42848634a843b8aa628dc77ffae03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff81bd6 update to 1.12.0