Support `cargo install --all`

[RalfJung]

There seems to be no easy way currently to install all binaries from all crates in a given workspace. Instead, cargo install has to be called for all of them separately. It would be nice if cargo install supported a --all flag to recurse into all crates of the workspace.

Does this seem to make sense?

[alexcrichton]

Makes sense to me!

I got scared that you might have meant cargo install --all as "install all binaries from crates.io please" but I like this interpretation better :)

[RalfJung]

I got scared that you might have meant cargo install --all as "install all binaries from crates.io please"

That one sounds like... a nice Easter egg? ;)

[est31]

Maybe it could be called cargo install --all-workspace ?

[RalfJung]

I suggested --all for consistency with cargo build. But unfortunately, cargo install is already working somewhat differently than build, test etc. (e.g., it doesn't take --package but instead takes --path).

[matthiasbeyer]

I second this! Would be really nice to have the --all feature! 👍

[matthiasbeyer]

I'm working on this, PR will be filed in a few minutes.

[rushmorem]

For some workspaces, it makes sense to install from only one specific package. For example:

cargo install --git https://github.com/habitat-sh/habitat --package hab --tag 0.58.0

In fact, I tried to run this exact command just a moment ago, which is what led me here.

@matthiasbeyer Would it be feasible to include this functionality in the same PR or should I open a separate issue?

[matthiasbeyer]

I'm on a sabbatical and cannot contribute code right now, so I suppose opening a new PR would be the way to go.