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Could not find `Cargo.toml` when building a dependent crate from GitHub

I'm trying to use the rust-mosquitto library. My current Cargo.toml is:

[package]
name = "HomeDaemon"
version = "0.1.0"
authors = ["RTR <k.teza1@gmail.com>"]

[dependencies.mosquitto]
git = "https://github.com/kteza1/rust-mosquitto"

When I run cargo build, following error is reported: 

Could not find `Cargo.toml` in `/Users/ravitejareddy/.cargo/git/checkouts/rust-mosquitto-8203e77dcf072bf7/rust-mosquitto`

The actual download in ~/.cargo/git/checkouts/rust-mosquitto-8203e77dcf072bf7/master shows that Cargo.toml is present.

There is an extra rust-mosquitto in the path above, is that a problem?

Solution

  • The problem comes from your Cargo.toml in examples/ticktock:

    [dependencies.mosquitto]
version = "*"
path = "../../../rust-mosquitto"

    When downloading your project from git, all the subdirectories are scanned for more Cargo.toml files. If you run RUST_LOG=trace cargo build -v, you see what's happening:

    TRACE:cargo::ops::cargo_read_manifest: looking for root package: /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master, source_id=https://github.com/kteza1/rust-mosquitto#7e08a291
TRACE:cargo::ops::cargo_read_manifest: looking for child package: /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master
TRACE:cargo::ops::cargo_read_manifest: read_package; path=/Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/Cargo.toml; source-id=https://github.com/kteza1/rust-mosquitto#7e08a291
TRACE:cargo::ops::cargo_read_manifest: looking for child package: /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/.git
TRACE:cargo::ops::cargo_read_manifest: not processing /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/.git
TRACE:cargo::ops::cargo_read_manifest: looking for child package: /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/examples
TRACE:cargo::ops::cargo_read_manifest: looking for child package: /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/examples/c-mosquitto
TRACE:cargo::ops::cargo_read_manifest: looking for child package: /Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/examples/ticktock
TRACE:cargo::ops::cargo_read_manifest: read_package; path=/Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/master/examples/ticktock/Cargo.toml; source-id=https://github.com/kteza1/rust-mosquitto#7e08a291
DEBUG:cargo: handle_error; err=CliError { error: ChainedError { error: Unable to update https://github.com/kteza1/rust-mosquitto, cause: Could not find `Cargo.toml` in `/Users/shep/.cargo/git/checkouts/rust-mosquitto-77eb7033f32b19c9/rust-mosquitto` }, unknown: false, exit_code: 101 }

    Cargo then tries to ensure that the nested Cargo.toml can have all of the dependencies satisfied.