[Feature Request] Force If Newer

[TheDan64]

In my project's CI, I cache a rust binary CLI tool so that it doesn't have to be reinstalled every time. However, when newer versions of the binary are released, it'd be nice to force an update.

So for example, it'd be great to have a cargo install X --force-if-newer flag which acts like the --force flag but is conditional on a never version of the binary being available. That way it doesn't reinstall blindly every time but only as necessary.

Edit: Oops, didn't open an internals thread first.

[k-nasa]

I'll take this task, is it ok❓

[dwijnand]

Shouldn't this be the behaviour under --ensure, too? I.e in your #6592 PR?

[k-nasa]

Oops. You're right.

[ehuss]

I believe this is now stabilized via #7560.

[TheDan64]

@ehuss Do I understand your change correctly - cargo install will now overwrite the binary by default, if it finds a new version?

[ehuss]

Yes, starting with 1.41 which is currently the nightly channel.