gps panics if it is unable to determine repository type

[matjam]

What version of Go (go version) and dep (git describe --tags) are you using?

go version go1.8.3 darwin/amd64
v0.1.0-215-g911cd22

What dep command did you run?

carbon:cmpc synpacket$ dep ensure -update
panic: shouldn't be possible unable to deduce repository and source type for "cloudmark.com/nollerenshaw/coolthing": unable to read metadata: go-import metadata not found

goroutine 1 [running]:
github.com/golang/dep/internal/gps.(*solver).selectRoot(0xc420068100, 0xc4201e61b0, 0xc4201e61e0)
	/Users/synpacket/Development/go/src/github.com/golang/dep/internal/gps/solver.go:549 +0xada
github.com/golang/dep/internal/gps.(*solver).Solve(0xc420068100, 0x43, 0x16be280, 0x170c2a8, 0xc4200180c8)
	/Users/synpacket/Development/go/src/github.com/golang/dep/internal/gps/solver.go:394 +0x8d
main.(*ensureCommand).Run(0xc420157780, 0xc42008d6d0, 0xc4200761a0, 0x0, 0x0, 0x0, 0x0)
	/Users/synpacket/Development/go/src/github.com/golang/dep/cmd/dep/ensure.go:148 +0x375
main.(*Config).Run(0xc42006efc0, 0xc42006efc0)
	/Users/synpacket/Development/go/src/github.com/golang/dep/cmd/dep/main.go:158 +0x876
main.main()
	/Users/synpacket/Development/go/src/github.com/golang/dep/cmd/dep/main.go:45 +0x253

What did you expect to see?

not a panic.

Maybe a helpful, "unable to determine the type of source cloudmark.com."

What did you see instead?

a panic :-(

[matjam]

it should be noted that I'm an idiot; the source is actually a different hostname. So this is unrelated to lack of being able to authenticate; rather it's probably getting a 404.

[sdboyer]

Improving feedback from this particular error case is basically the focus of #697 - closing this as dup. (thanks, though!)