Fail early if output engine file path is unwritable in trtexec

[PierreMarieCurie]

Hi NVIDIA team,

This PR adds an early check in trtexec to ensure the --saveEngine path is writable before starting ONNX parsing. It avoids unnecessary compute when the path is invalid. This a proposition to solve issue #4448.

It has only been tested on the following environment: Ubuntu 24.04 running as a Dev Container within WSL2.

Thanks!

[poweiw]

/blossom-ci

[poweiw]

/blossom-ci

[poweiw]

/blossom-ci

[poweiw]

Hello @PierreMarieCurie thanks for your contribution! Can you target the main branch and have your commits rebase on that?

[PierreMarieCurie]

Hello @poweiw, thanks for your feedback. I've rebased my branch onto main and updated the PR to target it. Let me know if there's anything else you'd like adjusted.

[poweiw]

Thanks Pierre for the fast response! I lost my permission to trigger the pipeline but should be able to run next week. Will lyk with the pipeline results.

[poweiw]

/blossom-ci

[PierreMarieCurie]

Hello @poweiw and @kevinch-nv, I messed up my rebase, sorry about that. The target branch was correct, but it was based on an old commit, so the pipeline failed. It should be fixed now.

[poweiw]

/blossom-ci

[PierreMarieCurie]

Hello, any update on this MR when you get a chance? Thanks a lot!

[wondfor]

/blossom-ci