Use POSIX-compliant . instead of source in .profile

[Xyene]

The invocation to source introduced in 850adef is not POSIX-compliant,
and not available in some shells. Use . instead, which will work in
all shells. Concretely, this was failing in Docker builds, where
/bin/sh is not Bash.

[kinnison]

Thank you for this.

[Xyene]

Thanks! Any idea when this will roll to rustup.sh? No big rush, just want to know whether it'll happen ~soon, or if I should work around it locally.

[kinnison]

Continue to work around locally for now I'm afraid. I will be trying to do a release early in Jan but can't guarantee when.

[DamianFekete]

@kinnison , I think there is a small issue with this change, but I'm also not sure if this is acceptable for this project or not.

• Uninstall/update won't work as expected with previously installed versions (unix.rs#do_remove_from_path now searches for . "$HOME/.cargo/env" although the resource file was modified with source "$HOME/.cargo/env")
• Rust will source the env file twice (not a practical problem, but not so nice):

# ~/.bashrc
source "$HOME/.cargo/env"
. "$HOME/.cargo/env"

[kinnison]

Hmm, that's a good point, we should probably detect both kinds in order that people don't end up confused on uninstallation. I've filed #2623 to this effect.