rustup.sh could pass a prefix to install.sh if the user isn't root

[ben0x539]

... so we could stop giving people a curl ... | sudo sh commandline and can suggest something like `curl ... | sh -s -- --prefix=~/rust' instead.

This sorta depends on our current rpath setup, but even if we have to suggest a bunch of LD_LIBRARY_PATH magic, it's probably still good to have something to tell people who are uneasy about sudo.

[ghost]

I second this. If rustup.sh is going to be recommended installation method, per the guide, then it should have at least this option.

[UPDATE] I see now that rustup does have this option:

$ rustup.sh --prefix=<PATH>

[mkpankov]

I think I'll take a look at this.

The complication is updating ${PATH} and ${LD_LIBRARY_PATH} though. And poking man in the right direction, since for me it doesn't pick up stuff installed in $HOME/install/*.

I intend to match the ${SHELL} variable to know what file to inspect for PATH and LD_LIBRARY_PATH assignments. Then if there is no $HOME/install/bin in $PATH I'd update the assignment and put that into appropriate .*rc file.

[steveklabnik]

This should be filed against https://github.com/rust-lang/rustup if it's still an issue.