cargo run no longer passes a stdin handle to child.

[brson]

Until today I could run cargo run --release against rustup to kick off the interactive installer, which reads a byte from stdin for confirmation. As of today when I do this rustup exits with an error. Calling std::stdin().lock().lines().next() returns None where it used to return Some.

Working rustc / cargo:

rustc 1.9.0-nightly (98f0a9128 2016-03-23)
cargo 0.10.0-nightly (61ad6a0 2016-03-22)

Failing rustc / cargo:

rustc 1.9.0-nightly (d7a71687e 2016-03-24)
cargo 0.10.0-nightly (4e6434d 2016-03-24)

[steveklabnik]

I believe I saw another thing about this today; but I can't find it. Something about Rust 1.6 bs 1.9. I thought it was on users, but maybe not...

To be clear, it was someone else surprised by this behavior.

On Mar 29, 2016, 17:11 -0700, Brian [email protected], wrote:

Until today I could runcargo run --releaseagainst rustup to kick off the interactive installer, which reads a byte from stdin for confirmation. As of today when I do this rustup exits with an error. Callingstd::stdin().lock().lines().next()returnsNonewhere it used to returnSome.

Working rustc / cargo:

rustc 1.9.0-nightly (98f0a9128 2016-03-23) cargo 0.10.0-nightly (61ad6a0 2016-03-22)

Failing rustc / cargo:

rustc 1.9.0-nightly (d7a71687e 2016-03-24) cargo 0.10.0-nightly (4e6434d 2016-03-24)

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[steveklabnik]

Found it!http://stackoverflow.com/q/36295576/24817

On Mar 29, 2016, 17:11 -0700, Brian [email protected], wrote:

Until today I could runcargo run --releaseagainst rustup to kick off the interactive installer, which reads a byte from stdin for confirmation. As of today when I do this rustup exits with an error. Callingstd::stdin().lock().lines().next()returnsNonewhere it used to returnSome.

Working rustc / cargo:

rustc 1.9.0-nightly (98f0a9128 2016-03-23) cargo 0.10.0-nightly (61ad6a0 2016-03-22)

Failing rustc / cargo:

rustc 1.9.0-nightly (d7a71687e 2016-03-24) cargo 0.10.0-nightly (4e6434d 2016-03-24)

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[alexcrichton]

Yeah this is an instance of rust-lang/rust#32254 which was introduced by rust-lang/rust#31618 and fixed in rust-lang/rust#32257. Cargo upgraded to a "broken rustc" in #2510 and I hope to fix this in #2531