multirust

multirust 是要管理系統上要使用多個 Rust 版本的問題， 設定後可以根據所在的專案來選擇使用的 Rust compiler 版本。

安裝：

$ yaourt -S multirust
$ pacman -Ql multirust
multirust /usr/
multirust /usr/local/
multirust /usr/local/bin/
multirust /usr/local/bin/cargo
multirust /usr/local/bin/multirust
multirust /usr/local/bin/multirustproxy
multirust /usr/local/bin/rust-gdb
multirust /usr/local/bin/rustc
multirust /usr/local/bin/rustdoc
multirust /usr/local/bin/rustup.sh
multirust /usr/local/lib/
multirust /usr/local/lib/rustlib/
multirust /usr/local/lib/rustlib/components
multirust /usr/local/lib/rustlib/install.log
multirust /usr/local/lib/rustlib/manifest-multirust
multirust /usr/local/lib/rustlib/rust-installer-version
multirust /usr/local/lib/rustlib/uninstall.sh

使用：

$ mkdir i_need_nightly
$ cd i_need_nightly
$ multirust override nightly
multirust: installing toolchain 'nightly'
rustup: gpg available. signatures will be verified
rustup: downloading manifest for 'nightly'
rustup: downloading toolchain for 'nightly'
######################################################################## 100.0%
gpg: assuming signed data in '/home/USERNAME/.multirust/rustup/dl/11c3c8d06c2df7315585/rust-nightly-x86_64-unknown-linux-gnu.tar.gz'
gpg: Signature made Sun 09 Aug 2015 05:34:35 PM CST using RSA key ID 7B3B09DC
gpg: Good signature from "Rust Language (Tag and Release Signing Key) <rust-key@rust-lang.org>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 108F 6620 5EAE B0AA A8DD  5E1C 85AB 96E6 FA1B E5FE
    Subkey fingerprint: C134 66B7 E169 A085 1886  3216 5CB4 A934 7B3B 09DC
rustup: extracting installer
rustup: installing toolchain for 'nightly'
install: creating uninstall script at /home/USERNAME/.multirust/toolchains/nightly/lib/rustlib/uninstall.sh
install: installing component 'rustc'
install: installing component 'cargo'
install: installing component 'rust-docs'

    Rust is ready to roll.

multirust: override toolchain for '/home/USERNAME/i_need_nightly' set to 'nightly'
$ rustc --version
rustc 1.4.0-nightly (a5d33d891 2015-08-08)
$ mkdir ../tmp
$ cd ../tmp
$ rustc --version
multirust: no default toolchain configured
/usr/local/bin/rustc: line 107: return: can only `return' from a function or sourced script
multirustproxy: assert_nz toolchain is empty
$ multirust override nightly
multirust: using existing install for 'nightly'
multirust: override toolchain for '/home/USERNAME/tmp' set to 'nightly'
$ rustc --version
rustc 1.4.0-nightly (a5d33d891 2015-08-08)