Fix registry resolution of major alternate package manifests

[fortmarek]

Motivation:

Let's take the following Package.swift:

// swift-tools-version: 5.7

import PackageDescription

let package = Package(
    name: "Library",
    dependencies: [
        .package(id: "AliSoftware.OHHTTPStubs", exact: "9.0.0")
    ]
)

You can find the OHHTTPStubs dependency at that version here.

The dependency has two manifests:

• Package.swift with swift-tools-version at 4.0
• [email protected] with swift-tools-version at 5.0

When resolving packages via the registry, SwiftPM should use the [email protected]. However, instead SwiftPM fails with:

Running resolver because the following dependencies were added: 'AliSoftware.OHHTTPStubs' (AliSoftware.OHHTTPStubs)
Computing version for AliSoftware.OHHTTPStubs
info: 'AliSoftware.OHHTTPStubs': retrieving AliSoftware.OHHTTPStubs metadata from http://localhost:8080/api/accounts/tuist/registry/swift/AliSoftware/OHHTTPStubs
info: 'AliSoftware.OHHTTPStubs': retrieving AliSoftware.OHHTTPStubs 9.0.0 metadata from http://localhost:8080/api/accounts/tuist/registry/swift/AliSoftware/OHHTTPStubs/9.0.0
info: 'AliSoftware.OHHTTPStubs': retrieving available manifests for AliSoftware.OHHTTPStubs 9.0.0 from http://localhost:8080/api/accounts/tuist/registry/swift/AliSoftware/OHHTTPStubs/9.0.0/Package.swift
info: 'AliSoftware.OHHTTPStubs': retrieving AliSoftware.OHHTTPStubs 9.0.0 metadata from http://localhost:8080/api/accounts/tuist/registry/swift/AliSoftware/OHHTTPStubs/9.0.0
info: 'AliSoftware.OHHTTPStubs': retrieving AliSoftware.OHHTTPStubs 9.0.0 manifest from http://localhost:8080/api/accounts/tuist/registry/swift/AliSoftware/OHHTTPStubs/9.0.0/Package.swift?swift-version=5.0.0
error: failed locating placeholder manifest for 5.0.0

Modifications:

The reason for the error is because when looking up the alternate package manifests from the downloaded source archive, SwiftPM doesn't try to find [email protected] – only [email protected] and [email protected].

When both minor and patch versions of the swift tools version are 0, SwiftPM should try to use the [email protected] alternate manifest.

Result:

[After your change, what will change.]

swift package resolve will work for packages in a registry that have alternate manifests in the format of [email protected].

[MaxDesiatov]

Thanks!

[MaxDesiatov]

@swift-ci test

[MaxDesiatov]

@swift-ci test