Rustup: --no-prompt option to rustup-init fails

[jimmycuadra]

The source code shows the long option --no-prompt as being the same as -y, but that doesn't actually work with the latest rustup:

$ curl -ssLO https://static.rust-lang.org/rustup/dist/x86_64-apple-darwin/rustup-init
$ chmod +x rustup-init
$ ./rustup-init --help
rustup-init 1.0.0 (17b6d21 2016-12-15)
The installer for rustup

USAGE:
    rustup-init [FLAGS] [OPTIONS]

FLAGS:
    -v, --verbose           Enable verbose output
    -y                      Disable confirmation prompt.
        --no-modify-path    Don't configure the PATH environment variable
    -h, --help              Prints help information
    -V, --version           Prints version information

OPTIONS:
        --default-host <default-host>              Choose a default host triple
        --default-toolchain <default-toolchain>    Choose a default toolchain to install

I discovered this after attempting to install Rust non-interactively on Circle CI and it errored:

curl https://sh.rustup.rs -sSf | sh -s -- --no-prompt
info: downloading installer
error: Found argument '--no-prompt' which wasn't expected, or isn't valid in this context

USAGE:
    rustup-init [FLAGS] [OPTIONS]

For more information try --help
rustup: command failed: /tmp/tmp.6EPokPxxSk/rustup-init --no-prompt

curl https://sh.rustup.rs -sSf | sh -s -- --no-prompt returned exit code 1

Action failed: curl https://sh.rustup.rs -sSf | sh -s -- --no-prompt

[nodakai]

You seem to have mistaken an internal lookup key for an option dictionary data structure as a long command line option. According to the documents of the clap command line parser,

• https://kbknapp.github.io/clap-rs/clap/struct.Arg.html

rustup-init has never supported a long command line option --no-prompt. Compare these two:

        .arg(Arg::with_name("no-prompt")
             .short("y")
             .help("Disable confirmation prompt."))

        .arg(Arg::with_name("verbose")
             .short("v")
             .long("verbose")
             .help("Enable verbose output"))

the latter of which surely accepts both -v and --verbose.

• https://github.com/rust-lang-nursery/rustup.rs/blob/master/src/rustup-cli/setup_mode.rs#L21

[jimmycuadra]

Ah, you are correct! I guess I will close this. Thanks!

[lmj0011]

I gathered from this that

curl https://sh.rustup.rs -sSf | sh -s -- -y

is what you need to run in order to skip the prompts.

--

Could someone explain or direct me to documentation on the -- part of that sh command? I didn't know I have to do that in order to pass an option to the rust install script.

I was trying to run it like this, previously:

curl https://sh.rustup.rs -sSf | sh -s -y

and was failing.

[nodakai]

@lmj0011 sh needs -- in order to separate command line parameters given to itself from those given to the script that it's interpreting. In your case, -s is meant to be an option for the sh command whereas you want to pass -y to the Rust installer script, hence -- between them.

My understanding is it's merely a decades-old convention but POSIX "Utility Syntax Guidelines" gives some legitimacy to it

• http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap12.html#tag_12_02