spack spec install status and source

[skwde]

It looks to me as if spack spec does not distinguish between external packages and binary cache.
Is there a way to show the source of the package (marked with [e])?

Maybe we can also distinguish between local external and upstream external?

Btw, the help does not describe [e]

$ spack spec --help
<...>
  -I, --install-status  show install status of packages
                        [+] installed       [^] installed in an upstream
                         -  not installed   [-] missing dep of installed package
<..>