$ git clone -n https://src.fedoraproject.org/rpms/doxygen.git /var/lib/mock/f40-build-2197892-51685/root/chroot_tmpdir/scmroot/doxygen
Cloning into '/var/lib/mock/f40-build-2197892-51685/root/chroot_tmpdir/scmroot/doxygen'...
$ git fetch origin 70d4609ddcd19f097326913b075be673e37f0e02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/doxygen
 * [new ref]         70d4609ddcd19f097326913b075be673e37f0e02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70d4609  bz#2255826, update to 1.10