Cargo config.toml - "access is denied"

[Inari-Whitebear]

System:
OS: Windows Home 10 (Anniversary Update)
toolchain: nightly-x86_64-pc-windows-gnu (default)
cargo: cargo 0.19.0-nightly (fa7584c14 2017-04-26)

I have a project at D:\Dev\Rust\arduino-cli. I have tried creating a "config" folder in D:\Dev\Rust\arduino-cli.cargo and it won't work properly. Trying to use C:\Users\Inari.cargo\config doesn't work either.
When that config folder in .cargo is present, cargo just refuses to work, whether or not I put a file inside.

D:\Dev\Rust\arduino-rs>cargo build --verbose
error: Couldn't load Cargo configuration

Caused by:
  Access is denied. (os error 5)

I tried turning Windows Defender off, it didn't help. I tried running Dr.Memory's strace thingy, relevant things form that I can find there is a bunch of this:

NtQueryVolumeInformationFile.FileFsVolumeInformation
	arg 0: 0x1d4 (type=HANDLE, size=0x8)
	arg 1: 0x0000000000f4b318 (type=IO_STATUS_BLOCK*, size=0x8)
	arg 2: 0x0000000000f4b3a0 (type=<struct>*, size=0x8)
	arg 3: 0x18 (type=unsigned int, size=0x4)
	arg 4: 0x1 (type=named constant, size=0x4)
    succeeded =>
	arg 1: status=0x0, info=0x12 (type=IO_STATUS_BLOCK*, size=0x8)
	arg 2: _FILE_FS_VOLUME_INFORMATION {_LARGE_INTEGER {0x1d0d12c03ab2ab1}, int=0xda0486f5, int=0x0, byte|bool=0x1, array(2)={0x0, 0x0}} (type=<struct>*, size=0x8)
	retval: 0x0 (type=NTSTATUS, size=0x4)
NtQueryInformationFile.FileAllInformation
	arg 0: 0x1d4 (type=HANDLE, size=0x8)
	arg 1: 0x0000000000f4b318 (type=IO_STATUS_BLOCK*, size=0x8)
	arg 2: 0x0000000000f4b330 (type=<struct>*, size=0x8)
	arg 3: 0x68 (type=unsigned int, size=0x4)
	arg 4: 0x12 (type=named constant, size=0x4)
    failed (error=0x80000005) =>
	arg 1: status=0x80000005, info=0x68 (type=IO_STATUS_BLOCK*, size=0x8)
	arg 2: _FILE_ALL_INFORMATION {_FILE_BASIC_INFORMATION {_LARGE_INTEGER {0x1d12a1051f2f630}, _LARGE_INTEGER {0x1d2c321e13a5fd0}, _LARGE_INTEGER {0x1d2c321e13a5fd0}, _LARGE_INTEGER {0x1d2c321e13a5fd0}, int=0x10}, _FILE_STANDARD_INFORMATION {_LARGE_INTEGER {0x1000}, _LARGE_INTEGER {0x1000}, int=0x1, byte|bool=0x0, byte|bool=0x1}, _FILE_INTERNAL_INFORMATION {_LARGE_INTEGER {0x5a000000016df4}}, _FILE_EA_INFORMATION {int=0x0}, _FILE_ACCESS_INFORMATION {int=0x100080}, _FILE_POSITION_INFORMATION {_LARGE_INTEGER {0x0}}, _FILE_MODE_INFORMATION {int=0x20}, _FILE_ALIGNMENT_INFORMATION {int=0x1}, _FILE_NAME_INFORMATION {int=0x26, array(2)={0x5c, 0x0}}} (type=<struct>*, size=0x8)
	retval: 0x80000005 (type=NTSTATUS, size=0x4)

The NtQueryVolumeInformationFile.FileFsVolumeInformation succeeds, but the NtQueryInformationFile.FileAllInformation following it fails. (Full log: https://gist.github.com/Inari-Whitebear/ee1cfb6aec0b464cf2b94ac56ba8dd26 )

I also tried running procmon, it seems to disagree and instead says the NtQueryInformationFile.FileAllInformation calls fail repeatedly with BUFFER_OVERFLOW results. I was told on IRC those are expected, it just means the caller hasn't provided a big enough buffer for the result. The callers apparently would just recall it with a bigger buffer. But it never seems to succeed. (Procmon log (CSV): https://gist.github.com/Inari-Whitebear/6674b8975617edfbb24700f44ae71042 )

[alexcrichton]

Could you gist the relevant configure files you've got on the system? That may help indicate what error is happening here perhaps?

[alexcrichton]

(we also definitely need to improve this error message!)

[Inari-Whitebear]

Sure, but it also happens when I even only create the config directory, not putting anything into it.
https://gist.github.com/Inari-Whitebear/f10fe36bb7d8c691453a40d51a97e9e0
I tried modifying the paths too, since I use windows. Tried "D:\Dev\Rust\libusb-1.0.21<platform>\static" as well as "/D/Dev/Rust/libusb-1.0.21//static"

[alexcrichton]

I've opended a PR to hopefully improve the error message here

[Inari-Whitebear]

Hm, did the PR already make it into the new release?

Inari@Neptune MINGW64 /d/dev/rust/arduino-rs (master)
$ cargo build --verbose
error: Couldn't load Cargo configuration

Caused by:
  Access is denied. (os error 5)

Inari@Neptune MINGW64 /d/dev/rust/arduino-rs (master)
$ cargo -V
cargo 0.20.0-nightly (cf17c9f71 2017-05-09)

[alexcrichton]

@Inari-Whitebear could you try running strace to home in on where the error is coming from? Looks like the PR didn't help :(

[carols10cents]

I have a project at D:\Dev\Rust\arduino-cli. I have tried creating a "config" folder in D:\Dev\Rust\arduino-cli.cargo and it won't work properly. Trying to use C:\Users\Inari.cargo\config doesn't work either.

Hm, it looks to me like the problem is that .cargo is supposed to be a subdirectory and config is supposed to be a file. That is, instead of creating this directory:

D:\Dev\Rust\arduino-cli.cargo\config\

What cargo is looking for is a subdirectory of arduino-cli whose name is .cargo:

D:\Dev\Rust\arduino-cli\.cargo

And within that directory, a file named config:

D:\Dev\Rust\arduino-cli\.cargo\config

I'm pretty sure that's the problem, so I'm going to close this issue (also since it hasn't had any recent activity). If this is not the problem, and the problem is still happening, or if you have ideas on how to improve the documentation, please reopen! Thanks!!