rust plugin doesn't check if the Cargo.toml file exists

Metadata

Project: snapcraft (launchpad)
Number: #1654768
Type: issue
State: open
Author: ~elopio
Labels: bitesize plugin
Created: 2017-01-07 17:45:10.195546+00:00
Updated: 2017-01-08 10:12:34.348695+00:00
Closed: —

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Issue body

Our rust plugin uses cargo to build the snap. Before checking if the Cargo.toml file, it downloads rust, and then it fails with: error: could not find `Cargo.toml` in `/home/ubuntu/workspace/canonical/snapcraft/integration_tests/snaps/rust-subdir/parts/rust-subdir/build` or any parent directory Before downloading anything, the plugin should make sure that the cargo file exists, to fail early if it doesn't.

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