$ git clone -n https://src.fedoraproject.org/rpms/jetty.git /var/lib/mock/f41-build-797171-13657/root/chroot_tmpdir/scmroot/jetty
Cloning into '/var/lib/mock/f41-build-797171-13657/root/chroot_tmpdir/scmroot/jetty'...
$ git fetch origin 21901f63867835a27c5e19c868a16276fccfe5c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jetty
 * [new ref]         21901f63867835a27c5e19c868a16276fccfe5c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21901f6 Eliminate use of obsolete %patchN syntax (#2283636)