SPM cannot resolve dependency graph

Hello,

I have an issue where, in one package I forked, I modified Package.swift so that one dependency points to the master branch of another package I forked.

.package(url: "https://github.com/adtrevor/http.git", .branch("master")),

Unfortunately, the package resolution errors with an unclear message:

websocket$ swift package show-dependencies

Fetching https://github.com/adtrevor/http.git

Updating https://github.com/apple/swift-nio-ssl.git

Updating https://github.com/vapor/core.git

Updating https://github.com/apple/swift-nio.git

Updating https://github.com/vapor/crypto.git

Updating https://github.com/apple/swift-nio-zlib-support.git

Updating https://github.com/apple/swift-nio-ssl-support.git

Updating https://github.com/apple/swift-nio-http2.git

Updating https://github.com/apple/swift-nio-extras.git

Updating https://github.com/apple/swift-log.git

error: dependency graph is unresolvable; found these conflicting requirements:

Dependencies:

https://github.com/adtrevor/http.git @ master

I don't understand at all what is happening. Is this a bug or am I doing something wrong?

Thank you

cc: @Aciid Is this something that will get better error messages similar to SwiftPM: what's the conflict? ? I can't find at all the cause with the current error :confused:

There is work going on in SwiftPM that will dramatically improve the dependency resolution error messages. It's not all there yet but I just ran the new resolver on your package and got this:

because http @master depends on swift-nio-ssl ^2.0.0 and websocket depends on http @master, websocket requires swift-nio-ssl.
And because websocket depends on swift-nio-ssl ^1.3.1 and root depends on websocket, version solving failed.

To pin point, here are the conflicts:


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Thanks a lot! Nice to see the improvement for the messages! :)

@kiliankoe might be encouraged to see that his work already came in useful. (You too Ankit, but you already know.)

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This also not working properly on my iOS device. It is showing iTunes has an invalid signature. Please help me to fix this properly.

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