$ git clone -n https://src.fedoraproject.org/rpms/sysprof.git /var/lib/mock/f39-build-1657370-40565/root/chroot_tmpdir/scmroot/sysprof
Cloning into '/var/lib/mock/f39-build-1657370-40565/root/chroot_tmpdir/scmroot/sysprof'...
$ git fetch origin 63b853a944755ce656b29ff06a3826718cfc809c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sysprof
 * [new ref]         63b853a944755ce656b29ff06a3826718cfc809c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63b853a Update to 45.1