$ git clone -n https://src.fedoraproject.org/rpms/rust-zgvariant_derive.git /var/lib/mock/f45-build-46349-833/root/chroot_tmpdir/scmroot/rust-zgvariant_derive
Cloning into '/var/lib/mock/f45-build-46349-833/root/chroot_tmpdir/scmroot/rust-zgvariant_derive'...
$ git fetch origin 5fcf440fa7344cc14aa4505bc51d0affb394ccfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zgvariant_derive
 * [new ref]         5fcf440fa7344cc14aa4505bc51d0affb394ccfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5fcf440 Initial import (RHBZ#2538727)