cargo install fails from local git checkout

[kjeremy]

If I clone diesel from https://github.com/diesel-rs/diesel and enter the diesel_cli directory and attempt to cargo install --path . from there it fails to pick up a local dependency from the repo and fails to install. See: diesel-rs/diesel#1683 for more information.

[alexcrichton]

Thanks for the report! This is currently because cargo install doesn't respect workspace information. Right now it looks like the diesel crates require workspace information to work as they're relying on [replace] (I think?)

@sgrif would it be possible to switch diesel's internal dependencies to path dependencies? That way this would naturally work as well as depending on git verisons of diesel

[dwijnand]

Is it desired that cargo install respects workspace information?

[alexcrichton]

I think it makes sense for git and path deps yeah, but not for crates.io

[nixpulvis]

We just refactored our project to make use of workspaces, but now we don't seem to have a replacement for our install from git instructions: cargo install --git https://github.com/jwilm/alacritty. Original issue in alacritty/alacritty#2378.

Making matters a bit worse, is that the error message isn't very clear:

Caused by:
  multiple packages link to native library `freetype`, but a native library can be linked only once

...

I could see cargo install --git https://github.com/jwilm/alacritty --package alacritty being a solution for our use case anyway. This also follow from #3691, unless I'm missing something.