$ git clone -n https://src.fedoraproject.org/rpms/sendmail.git /var/lib/mock/f42-build-3458070-45512/root/chroot_tmpdir/scmroot/sendmail
Cloning into '/var/lib/mock/f42-build-3458070-45512/root/chroot_tmpdir/scmroot/sendmail'...
$ git fetch origin 141c760d6c538d4a92c7da8fa4419971b5397144:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sendmail
 * [new ref]         141c760d6c538d4a92c7da8fa4419971b5397144 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 141c760 Add sysusers.d config file to allow rpm to create users/groups automatically