Paket has trouble resolving .NET Core dependency lists

[dsyme]

Description

I've been trying to use Paket to resolve the kind of dependency listings we're seeing in project.json files for compiling F# .NET Core components. I'm finding that Paket rarely succeeds in resolving these dependency lists.

Repro steps

Create a paket.dependencies for this dependency listing, taken straight from this project.json

Expected: the dependency list resolves OK in reasonable time

Actual: I aborted the operation after about 8 minutes, with this log

[tsibelman]

I think that in case you had defined a framework version in your paket.dependency it would work faster

[forki]

Thanks for reporting.

If the resolver needs that longer it usually means there is no valid
resolution. Paket is much more restrictive about that. But I assume there
still new things to discover here...

[forki]

mhm. even with strategy:min (which is NuGet's default) it doesn't find a valid resolution in a short timespan.

source https://www.myget.org/F/dotnet-core/api/v3/index.json
source https://www.nuget.org/api/v2/
strategy: min

I assume there is in fact no valid resolution (looks like one of packages needs System.Compression and there is only a RC3 version of it and that's incompatible to other stuff).

If we open the version restrictions like the following then paket has no issues to find a valid resolution:

source https://www.myget.org/F/dotnet-core/api/v3/index.json
source https://www.nuget.org/api/v2/

nuget Microsoft.NETCore.Platforms prerelease
nuget NETStandard.Library prerelease 
nuget System.Collections.Immutable prerelease
nuget System.Diagnostics.Process prerelease
nuget System.Diagnostics.TraceSource prerelease
nuget System.Linq.Expressions prerelease   
nuget System.Linq.Queryable prerelease   
nuget System.Net.Requests prerelease  
nuget System.Reflection.Emit prerelease  
nuget System.Reflection.Emit.ILGeneration prerelease 
nuget System.Reflection.Metadata prerelease
nuget System.Reflection.TypeExtensions prerelease   
nuget System.Runtime.InteropServices prerelease 
nuget System.Runtime.InteropServices.PInvoke prerelease
nuget System.Runtime.Loader prerelease
nuget System.Security.Cryptography.Algorithms prerelease
nuget System.Security.Cryptography.Primitives prerelease 
nuget System.Threading.Tasks.Parallel prerelease 
nuget System.Threading.Thread prerelease    
nuget System.Threading.ThreadPool prerelease  
nuget Microsoft.DiaSymReader.PortablePdb prerelease 
nuget Microsoft.DiaSymReader prerelease 

[dsyme]

OK, thanks. I'll close for now. I somehow suspect these might indicate recurring problems, where people take an existing project.json and try to use Paket over the same dependencies.

[dsyme]

@forki Just to mention that although the resolution did go through, it resolved to a bunch of packages using the netstandard1.0, netstandard1.3 and netstandard1.5 monikers, which Paket doesn't yet understand.

So a big 👍 to adding support for the netstandard monikers :)

[forki]

Yeah we will add that. And next week they will make that obsolete again
like they did with DNX ;-)

Just kidding.
Obviously.
I hope.

;-)

[dsyme]

@forki I think netstandard is going to stick.