$ git clone -n https://src.fedoraproject.org/rpms/rust-h3-quinn.git /var/lib/mock/f40-build-2268865-54749/root/chroot_tmpdir/scmroot/rust-h3-quinn
Cloning into '/var/lib/mock/f40-build-2268865-54749/root/chroot_tmpdir/scmroot/rust-h3-quinn'...
$ git fetch origin c1b1c31fb727f13f0e1cf9f04f00985efeec28c4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-h3-quinn
 * [new ref]         c1b1c31fb727f13f0e1cf9f04f00985efeec28c4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1b1c31 Update to version 0.0.4