$ git clone -n https://src.fedoraproject.org/rpms/ssmtp.git /var/lib/mock/f41-build-1182631-21975/root/chroot_tmpdir/scmroot/ssmtp
Cloning into '/var/lib/mock/f41-build-1182631-21975/root/chroot_tmpdir/scmroot/ssmtp'...
$ git fetch origin 375f266bb91c887ea084be26b2a8277d02f06a83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ssmtp
 * [new ref]         375f266bb91c887ea084be26b2a8277d02f06a83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 375f266 Eliminate use of obsolete %patchN syntax (#2283636)