"cargo install --git" requires a crate name when a workspace has multiple binaries

[teor2345]

Problem

What I did:

I tried running the command:

cargo install --git https://github.com/ZcashFoundation/zebra --branch main

But I got the error:

    Updating git repository `https://github.com/ZcashFoundation/zebra`
error: multiple packages with binaries found: zebra-utils, zebrad  

I tried:

• specifying --bin zebrad
• specifying --bins
• modifying the default-members in the workspace Cargo.toml to exclude zebra-utils

Then I found the correct command syntax in #7194:

cargo install --git https://github.com/ZcashFoundation/zebra --branch main zebrad

Steps

1. Run cargo install --git https://github.com/ZcashFoundation/zebra --rev 65e38b3c74eb06b14939448e368848f8ff0598b1

Possible Solution(s)

Here's what I expected:

1. --bin zebrad should install the binary with that name, if there are multiple packages with binaries
2. --bins should install all binaries, if there are multiple packages with binaries
3. if there is only one binary in the workspace default-members, that binary should be installed
4. a multiple packages with binaries found error should give users a hint about how to specify a single crate

Notes

Output of cargo version:

cargo 1.45.1 

Output of uname -a:

Linux ... 5.4.75 #1-NixOS SMP Thu Nov 5 10:43:38 UTC 2020 x86_64 GNU/Linux 

[ehuss]

Closing as a duplicate of #4830. These all sound like reasonable suggestions to me, though.