crash in rust src root: "could not find parent of path /"

[matthiaskrgr]

git clone http://github.com/rust-lang/rust/ --depth=1
cd ./rust/src
cargo clippy

thread 'main' panicked at 'could not find parent of path /', src/main.rs:124:48
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at libstd/sys_common/backtrace.rs:59
             at libstd/panicking.rs:206
   3: std::panicking::default_hook
             at libstd/panicking.rs:222
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:400
   5: std::panicking::begin_panic_fmt
             at libstd/panicking.rs:347
   6: cargo_clippy::main::{{closure}}
             at src/main.rs:124
   7: <core::option::Option<T>>::unwrap_or_else
             at /checkout/src/libcore/option.rs:376
   8: cargo_clippy::main
             at src/main.rs:122
   9: std::rt::lang_start::{{closure}}
             at /checkout/src/libstd/rt.rs:74
  10: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:305
  11: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  12: std::rt::lang_start_internal
             at libstd/panicking.rs:284
             at libstd/panic.rs:361
             at libstd/rt.rs:58
  13: std::rt::lang_start
             at /checkout/src/libstd/rt.rs:74
  14: main
  15: __libc_start_main
  16: _start

clippy 0.0.186
rustc 1.25.0-nightly (27a046e 2018-02-18)

[phansch]

@matthiaskrgr Hmm, the original error should have been fixed in 0.0.190 and #2585 because the offending code has been removed.

When I try this now, I get a different error:

$ git clone http://github.com/rust-lang/rust/ --depth=1
$ cd ./rust/src
$ cargo clippy                                                                                                                                                                                 
error: failed to read `/home/phansch/code/repros/rust/src/tools/clippy/Cargo.toml`                                                                                                             

Caused by:
  No such file or directory (os error 2)

The tools/clippy directory is completely empty, I'm not sure if that's correct.

[matthiaskrgr]

Hi,
in the rustc repo tools/clippy is a submodule, its probably uninitialized (thus the empty directory).
If you run ./x.py I think that should fetch and initialize all the required submodules. :)

[phansch]

Thank you! With the submodule cloned, clippy works 🎉 (and reports a few lints). So I'm going ahead and close this.