$ git clone -n https://src.fedoraproject.org/rpms/rust-http.git /var/lib/mock/f38-build-side-43-rust-devel-1417956-31459/root/chroot_tmpdir/scmroot/rust-http
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417956-31459/root/chroot_tmpdir/scmroot/rust-http'...
$ git fetch origin a63b434321d919b868d68bb83e3af6232bcac135:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-http
 * [new ref]         a63b434321d919b868d68bb83e3af6232bcac135 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a63b434 Relax indexmap dev-dependency from <=1.8 to ^1