$ git clone -n https://src.fedoraproject.org/rpms/rust-linktime-proc-macro.git /var/lib/mock/f45-build-42997-799/root/chroot_tmpdir/scmroot/rust-linktime-proc-macro
Cloning into '/var/lib/mock/f45-build-42997-799/root/chroot_tmpdir/scmroot/rust-linktime-proc-macro'...
$ git fetch origin 5050206faf2dfa4aafe602bc95640b8f13916264:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-linktime-proc-macro
 * [new ref]         5050206faf2dfa4aafe602bc95640b8f13916264 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5050206 Update to version 0.2.3