Since `tr` converts lowercase to uppercase according to system locale using `LC_CTYPE` environment variable; on some locales, rustup.sh fails to use correct variables names, thus deletes temporarily downloaded files and gives a meaningless error as shown below. This a simple fix which explictly sets `LC_CTYPE` as `C`.
Here is what happens without the fix:
```
➜ projects curl -s https://static.rust-lang.org/rustup.sh | sudo sh
rustup: CFG_CURL := /usr/bin/curl (7.22.0)
rustup: CFG_TAR := /bin/tar (1.26)
rustup: CFG_FILE := /usr/bin/file (5.09)
rustup: CFG_SHA256SUM := /usr/bin/sha256sum (256sum)
rustup: CFG_SHASUM := /usr/bin/shasum (5.61)
rustup:
rustup: processing sh args
rustup:
rustup: CFG_PREFiX :=
rustup: CFG_DATE :=
rustup:
rustup: validating sh args
rustup:
rustup: host triple: i686-unknown-linux-gnu
rustup: Downloading https://static.rust-lang.org/dist/rust-nightly-i686-unknown-linux-gnu.tar.gz to /tmp/tmp.Wz6F1ToG5z/rust-nightly-i686-unknown-linux-gnu.tar.gz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 132M 100 132M 0 0 59947 0 0:38:31 0:38:31 --:--:-- 71204
rustup: Downloading https://static.rust-lang.org/dist/rust-nightly-i686-unknown-linux-gnu.tar.gz.sha256
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 109 100 109 0 0 107 0 0:00:01 0:00:01 --:--:-- 169
rustup: Verifying hash
rustup: Extracting /tmp/tmp.Wz6F1ToG5z/rust-nightly-i686-unknown-linux-gnu.tar.gz
install: looking for install programs
install:
install: found mkdir
install: found printf
install: found cut
install: found grep
install: found uname
install: found tr
install: found sed
install: found chmod
install:
install: processing /tmp/tmp.Wz6F1ToG5z/rust-nightly-i686-unknown-linux-gnu/install.sh args
install:
install: CFG_DESTDiR :=
install: CFG_PREFiX := /usr/local
install: CFG_LiBDiR := /lib
install: CFG_MANDiR := /share/man
install:
install: validating /tmp/tmp.Wz6F1ToG5z/rust-nightly-i686-unknown-linux-gnu/install.sh args
install:
install: verifying platform can run binaries
install: verifying destination is writable
mkdir: cannot create directory `': No such file or directory
install: error: can't write to destination. consider `sudo`.
rustup: error: failed to install Rust
```
Notice how `i` wasn't replaced with `I`.
Rust is installed as usual after the fix. Tested on Ubuntu x86 12.04 LTS.
I'm not exactly sure if setting LC_CTYPE is the best solution, but there's that.
8c639d3c6e