$ git clone -n https://src.fedoraproject.org/rpms/rust-tiny_http.git /var/lib/mock/f40-build-2131068-50797/root/chroot_tmpdir/scmroot/rust-tiny_http
Cloning into '/var/lib/mock/f40-build-2131068-50797/root/chroot_tmpdir/scmroot/rust-tiny_http'...
$ git fetch origin e769369949072b603575b60b85694bfe1848d0c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tiny_http
 * [new ref]         e769369949072b603575b60b85694bfe1848d0c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e769369 Update to 0.12.0 (#1825699)