$ git clone -n https://src.fedoraproject.org/rpms/rust-pep508_rs.git /var/lib/mock/f38-build-side-42-init-devel-1145054-30457/root/chroot_tmpdir/scmroot/rust-pep508_rs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1145054-30457/root/chroot_tmpdir/scmroot/rust-pep508_rs'...
$ git fetch origin 3d4986bee78456357b32045a624be4d3f661fd56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pep508_rs
 * [new ref]         3d4986bee78456357b32045a624be4d3f661fd56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d4986b Update to version 0.2.1; Fixes RHBZ#2196313