$ git clone -n https://src.fedoraproject.org/rpms/sendemail.git /var/lib/mock/f41-build-710902-13023/root/chroot_tmpdir/scmroot/sendemail
Cloning into '/var/lib/mock/f41-build-710902-13023/root/chroot_tmpdir/scmroot/sendemail'...
$ git fetch origin c521ee3890e0d0ade4cfb9dff5595534767d540a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sendemail
 * [new ref]         c521ee3890e0d0ade4cfb9dff5595534767d540a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c521ee3 Eliminate use of obsolete %patchN syntax (#2283636)