$ git clone -n https://src.fedoraproject.org/rpms/rust-opaque-debug.git /var/lib/mock/f45-build-43531-803/root/chroot_tmpdir/scmroot/rust-opaque-debug
Cloning into '/var/lib/mock/f45-build-43531-803/root/chroot_tmpdir/scmroot/rust-opaque-debug'...
$ git fetch origin b46ed087cbdf2d7977da9f7a348ee4c6b00abfaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-opaque-debug
 * [new ref]         b46ed087cbdf2d7977da9f7a348ee4c6b00abfaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b46ed08 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild