$ git clone -n https://src.fedoraproject.org/rpms/rust-quinn-udp /var/lib/mock/f42-build-3453370-45488/root/chroot_tmpdir/scmroot/rust-quinn-udp
Cloning into '/var/lib/mock/f42-build-3453370-45488/root/chroot_tmpdir/scmroot/rust-quinn-udp'...
$ git fetch origin 009a23d5207bf64976f8c84d4d36a1d39f13ba3d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-quinn-udp
 * [new ref]         009a23d5207bf64976f8c84d4d36a1d39f13ba3d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 009a23d Update to version 0.5.10; Fixes RHBZ#2345722