[CI] [Rust] Fix broken cargo coverage

[asfimport]

The Rust cargo coverage is failing with the following error:

warning: unused manifest key: package.edition
warning: unused manifest key: package.edition
...
error[E0432]: unresolved import `num`
  --> arrow/src/array_ops.rs:22:5
   |
22 | use num::Zero;
   |     ^^^ did you mean `std::num`?
error[E0432]: unresolved imports `self::csv_crate::StringRecord`, `self::csv_crate::StringRecordsIntoIter`
  --> arrow/src/csv/reader.rs:55:23
   |
55 | use self::csv_crate::{StringRecord, StringRecordsIntoIter};
   |                       ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^ no `StringRecordsIntoIter` in `csv`
   |                       |
   |                       no `StringRecord` in `csv`
error[E0432]: unresolved import `serde_derive`
  --> arrow/src/datatypes.rs:29:5
   |
29 | use serde_derive::{Deserialize, Serialize};
   |     ^^^^^^^^^^^^ maybe a missing `extern crate serde_derive;`?
error[E0432]: unresolved import `serde_json`
  --> arrow/src/datatypes.rs:30:5
   |
30 | use serde_json::{json, Value};
   |     ^^^^^^^^^^ maybe a missing `extern crate serde_json;`?
error[E0432]: unresolved import `libc`
  --> arrow/src/memory.rs:18:5
   |
18 | use libc;
   |     ^^^^ no `libc` in the root
error[E0432]: unresolved import `rand`
  --> arrow/src/util/test_util.rs:18:5
   |
18 | use rand::{thread_rng, Rng};
   |     ^^^^ maybe a missing `extern crate rand;`?
...

perhaps because it doesn't recognize Rust 2018 edition.

Reporter: Chao Sun / @sunchao
Assignee: Jorge Leitão / @jorgecarleitao

PRs and other links:

• GitHub Pull Request #7797

_{Note: This issue was originally created as ARROW-4189. Please see the migration documentation for further details.}

[asfimport]

Owen Nelson / @onelson:
@sunchao I'd expect to see output like this when using an older version of the rust toolchain (lower than 1.31). Support for editions was added to cargo with 1.31, along with almost but not all of the module system updated (there were some minor changes made in the subsequent 1.32 release).

Do you happen to know which version of the toolchain you saw this with?

[asfimport]

Andy Grove / @andygrove:
Code coverage seems to have been broken for many months due to multiple reasons ... I will work on getting it running again as part of moving to the use of docker compose for the CI builds

[asfimport]

Andy Grove / @andygrove:
The current travis code for reference is

 cargo install cargo-tarpaulin -f
cargo tarpaulin --out Xml
bash <(curl -s https://codecov.io/bash) || echo "Codecov did not collect coverage reports" 

When trying to run this via docker-compose it fails with:

 Failed to run tests: ASLR disable failed: EPERM: Operation not permitted

I'm not even sure why we were using Tarpaulin when the codecov.io documentation provides a different method based on kcov: https://github.com/codecov/example-rust

[asfimport]

Jorge Leitão / @jorgecarleitao:
@andygrove, that error happens because our docker run does not pass a security variable required by Tarpaulin, details #7797 (comment)

I would go for Tarpaulin; it seems to be the standard for rust. I was able to make it work on our repo outside docker but it naturally doubles the build time. I am trying to move it to inside the image.

[asfimport]

Andy Grove / @andygrove:
I have unassigned myself from this issue since I have too many other issues I am working on and don't want to block progress on this

[asfimport]

Krisztian Szucs / @kszucs:
Issue resolved by pull request 7797
#7797