$ git clone -n https://src.fedoraproject.org/rpms/rust-lzma-sys.git /var/lib/mock/f45-build-43095-800/root/chroot_tmpdir/scmroot/rust-lzma-sys
Cloning into '/var/lib/mock/f45-build-43095-800/root/chroot_tmpdir/scmroot/rust-lzma-sys'...
$ git fetch origin 70cc61b3da9ae9db91717eea3ba5b0895e49d0b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-lzma-sys
 * [new ref]         70cc61b3da9ae9db91717eea3ba5b0895e49d0b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 70cc61b Regenerate with rust2rpm v28