$ git clone -n https://src.fedoraproject.org/rpms/rust-combine.git /var/lib/mock/f40-build-2224348-52780/root/chroot_tmpdir/scmroot/rust-combine
Cloning into '/var/lib/mock/f40-build-2224348-52780/root/chroot_tmpdir/scmroot/rust-combine'...
$ git fetch origin 74ba670e2e945f69f0e2fe6f39b0884164286704:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-combine
 * [new ref]         74ba670e2e945f69f0e2fe6f39b0884164286704 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74ba670 Regenerate with rust2rpm v25