Slavek give's a nice introduction into how Copr works and what it does.
Now - Copr can be used to create public repositories for 3rd-party packages like rust - which can not (yet) land in the official Fedora repos (in rusts's case because of the bundling other libs).
I had to uploaded a source rpm of rust and point Copr to it, so Copr can pick it up and do a chroot build.
Best is that Copr is also creating the appropriate repository and you only need the following repo file to install rust with dnf or yum.
# Add the following repo file $ cat rust.repo [fabiand-rust-unofficial] name=Rust packages (unofficial) baseurl=http://copr-be.cloud.fedoraproject.org/results/fabiand/rust/ enabled=1 metadata_expire=7d gpgcheck=0 # And install it $ sudo dnf install rust
In general Copr seems to be nice - it's still abit rough around the edges, but that's expected. It can surely imagine that t's going to fit well into our existing infrastructure.
[Update] The copr landing page for rust and the package rust-0.6-2.fc18.x86_64.rpm link.