$ git clone -n https://src.fedoraproject.org/rpms/rust-quinn-proto.git /var/lib/mock/f45-build-44178-811/root/chroot_tmpdir/scmroot/rust-quinn-proto
Cloning into '/var/lib/mock/f45-build-44178-811/root/chroot_tmpdir/scmroot/rust-quinn-proto'...
$ git fetch origin a4f60e18f177db4fc091be743b9a280e2716f8fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-quinn-proto
 * [new ref]         a4f60e18f177db4fc091be743b9a280e2716f8fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4f60e1 Update to version 0.11.18; Fixes RHBZ#2533016