Rather build in some tmp dir and then move it into current dir.
Basically now you can't build any rust packages from git repo:
+ /usr/bin/cargo package -l + xargs /usr/bin/cp --parents -a -t /home/brain/rpmbuild/BUILDROOT/rust-void-1.0.2-7.fc30.x86_64/usr/share/cargo/registry/void-1.0.2 error: 4 files in the working directory contain changes that were not yet committed into git: Cargo.toml Cargo.toml.orig README.md src/lib.rs to proceed despite this, pass the `--allow-dirty` flag /usr/bin/cp: missing file operand Try '/usr/bin/cp --help' for more information.