$ git clone -n https://src.fedoraproject.org/rpms/rust-quinn.git /var/lib/mock/f42-build-side-1-3502560-45978/root/chroot_tmpdir/scmroot/rust-quinn
Cloning into '/var/lib/mock/f42-build-side-1-3502560-45978/root/chroot_tmpdir/scmroot/rust-quinn'...
$ git fetch origin d70904922b7a647f7903c0a30fab5fb06044c9ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-quinn
 * [new ref]         d70904922b7a647f7903c0a30fab5fb06044c9ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d709049 Update to version 0.11.7; Fixes RHBZ#2353150