$ git clone -n https://src.fedoraproject.org/rpms/orc.git /var/lib/mock/f41-build-side-1-2650174-27567/root/chroot_tmpdir/scmroot/orc
Cloning into '/var/lib/mock/f41-build-side-1-2650174-27567/root/chroot_tmpdir/scmroot/orc'...
$ git fetch origin 68d1100e10321ecdc737fb9d623e7690bf7c822e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/orc
 * [new ref]         68d1100e10321ecdc737fb9d623e7690bf7c822e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68d1100 Update to 0.4.39