$ git clone -n https://src.fedoraproject.org/rpms/rust-http.git /var/lib/mock/f40-build-2108668-50611/root/chroot_tmpdir/scmroot/rust-http
Cloning into '/var/lib/mock/f40-build-2108668-50611/root/chroot_tmpdir/scmroot/rust-http'...
$ git fetch origin 7ab3b5a2f47b5175a1a40c43ab016a8767bf13d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-http
 * [new ref]         7ab3b5a2f47b5175a1a40c43ab016a8767bf13d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7ab3b5a Update to version 0.2.10; Fixes RHBZ#2249082