$ git clone -n https://src.fedoraproject.org/rpms/sendmail.git /var/lib/mock/f42-build-867481-175511/root/chroot_tmpdir/scmroot/sendmail
Cloning into '/var/lib/mock/f42-build-867481-175511/root/chroot_tmpdir/scmroot/sendmail'...
$ git fetch origin 5a74570924e96649c967f176d342c5a69de0ddff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sendmail
 * [new ref]         5a74570924e96649c967f176d342c5a69de0ddff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a74570 Rebuilt for the bin-sbin merge (2nd attempt)