exec-harness: benchmark URI built from pre-truncation name #368

What I observed

For a long explicit benchmark name, generate_name_and_uri returns a truncated name, but the returned uri still contains the full untruncated name.

The result I observed for a 2000-character name was:

name.len() = 924
uri.len() = 2014
uri == format!("exec_harness::{}", name) = false

Reproduction

The behavior is in crates/exec-harness/src/uri.rs.

Minimal direct check:

let name = Some("x".repeat(2000));
let command = vec!["true".to_string()];
let result = generate_name_and_uri(&name, &command);

assert_eq!(result.name.len(), 924);
assert_eq!(result.uri, format!("exec_harness::{}", result.name));

The final assertion fails because result.uri is built from the longer input name.

Expected behavior

If the benchmark name is truncated, I expected the returned URI to match the returned name:

uri == format!("exec_harness::{}", name)

Actual behavior

The returned name and uri disagree for long explicit names.

I have not verified whether this causes a user-visible failure after upload; the hard fact I observed is the mismatch above.