Revert "refine location comparison when pre-loading package (#7002)" (#7031)

I've verified that the reverted commit removes required packages from
`Package.resolved` in certain dependency graphs.

This reverts commit 1491d34.

```
# Conflicts:
#	Sources/Workspace/Workspace+Manifests.swift
#	Sources/Workspace/Workspace.swift
```

Resolves rdar://117381924.

Author: MaxDesiatov

Sources/PackageGraph/PubGrub/ContainerProvider.swift

@@ -62,14 +62,14 @@ final class ContainerProvider {
         completion: @escaping (Result<PubGrubPackageContainer, Error>) -> Void
     ) {
         // Return the cached container, if available.
-        if let container = self.containersCache[comparingLocation: package] {
+        if let container = self.containersCache[package], package.equalsIncludingLocation(container.package) {
             return completion(.success(container))
         }
 
         if let prefetchSync = self.prefetches[package] {
             // If this container is already being prefetched, wait for that to complete
             prefetchSync.notify(queue: .sharedConcurrent) {
-                if let container = self.containersCache[comparingLocation: package] {
+                if let container = self.containersCache[package], package.equalsIncludingLocation(container.package) {
                     // should be in the cache once prefetch completed
                     return completion(.success(container))
                 } else {
@@ -125,12 +125,3 @@ final class ContainerProvider {
         }
     }
 }
-
-extension ThreadSafeKeyValueStore where Key == PackageReference, Value == PubGrubPackageContainer {
-    subscript(comparingLocation package: PackageReference) -> PubGrubPackageContainer? {
-        if let container = self[package], container.package.equalsIncludingLocation(package) {
-            return container
-        }
-        return .none
-    }
-}

Sources/PackageModel/PackageIdentity.swift

@@ -424,7 +424,7 @@ public struct CanonicalPackageLocation: Equatable, CustomStringConvertible {
 }
 
 /// Similar to `CanonicalPackageLocation` but differentiates based on the scheme.
-public struct CanonicalPackageURL: Equatable, CustomStringConvertible {
+public struct CanonicalPackageURL: CustomStringConvertible {
     public let description: String
     public let scheme: String?
 

Sources/PackageModel/PackageReference.swift

@@ -161,24 +161,7 @@ extension PackageReference: Equatable {
 
     // TODO: consider rolling into Equatable
     public func equalsIncludingLocation(_ other: PackageReference) -> Bool {
-        if self.identity != other.identity {
-            return false
-        }
-        if self.canonicalLocation != other.canonicalLocation {
-            return false
-        }
-        switch (self.kind, other.kind) {
-        case (.remoteSourceControl(let lurl), .remoteSourceControl(let rurl)):
-            return lurl.canonicalURL == rurl.canonicalURL
-        default:
-            return true
-        }
-    }
-}
-
-extension SourceControlURL {
-    var canonicalURL: CanonicalPackageURL {
-        CanonicalPackageURL(self.absoluteString)
+        return self.identity == other.identity && self.canonicalLocation == other.canonicalLocation
     }
 }
 

Sources/Workspace/ManagedDependency.swift

@@ -196,7 +196,7 @@ extension Workspace {
 
         // When loading manifests in Workspace, there are cases where we must also compare the location
         // as it may attempt to load manifests for dependencies that have the same identity but from a different location
-        // (e.g. dependency is changed to a fork with the same identity)
+        // (e.g. dependency is changed to  a fork with the same identity)
         public subscript(comparingLocation package: PackageReference) -> ManagedDependency? {
             if let dependency = self.dependencies[package.identity], dependency.packageRef.equalsIncludingLocation(package) {
                 return dependency

Sources/Workspace/Workspace+Dependencies.swift

@@ -859,8 +859,9 @@ extension Workspace {
             // a required dependency that is already loaded (managed) should be represented in the pins store.
             // also comparing location as it may have changed at this point
             if requiredDependencies.contains(where: { $0.equalsIncludingLocation(dependency.packageRef) }) {
+                let pin = pinsStore.pins[dependency.packageRef.identity]
                 // if pin not found, or location is different (it may have changed at this point) pin it
-                if pinsStore.pins[comparingLocation: dependency.packageRef] == .none {
+                if !(pin?.packageRef.equalsIncludingLocation(dependency.packageRef) ?? false) {
                     pinsStore.pin(dependency)
                 }
             } else if let pin = pinsStore.pins[dependency.packageRef.identity] {

Sources/Workspace/Workspace+Manifests.swift

@@ -198,8 +198,6 @@ extension Workspace {
                 }
             }
 
-            let topLevelDependencies = root.packages.flatMap { $1.manifest.dependencies.map(\.packageRef) }
-
             var requiredIdentities: OrderedCollections.OrderedSet<PackageReference> = []
             _ = transitiveClosure(inputNodes) { node in
                 node.manifest.dependenciesRequired(for: node.productFilter).compactMap { dependency in
@@ -211,28 +209,17 @@ extension Workspace {
                         if existing.canonicalLocation == package.canonicalLocation {
                             // same literal location is fine
                             if existing.locationString != package.locationString {
-                                // we prefer the top level dependencies
-                                if topLevelDependencies.contains(where: {
-                                    $0.locationString == existing.locationString
-                                }) {
-                                    observabilityScope.emit(debug: """
-                                    similar variants of package '\(package.identity)' \
-                                    found at '\(package.locationString)' and '\(existing.locationString)'. \
-                                    using preferred root variant '\(existing.locationString)'
-                                    """)
-                                } else {
-                                    let preferred = [existing, package].sorted(by: {
-                                        $0.locationString > $1.locationString
-                                    }).first! // safe
-                                    observabilityScope.emit(debug: """
-                                    similar variants of package '\(package.identity)' \
-                                    found at '\(package.locationString)' and '\(existing.locationString)'. \
-                                    using preferred variant '\(preferred.locationString)'
-                                    """)
-                                    if preferred.locationString != existing.locationString {
-                                        requiredIdentities.remove(existing)
-                                        requiredIdentities.insert(preferred, at: index)
-                                    }
+                                let preferred = [existing, package].sorted(by: {
+                                    $0.locationString > $1.locationString
+                                }).first! // safe
+                                observabilityScope.emit(debug: """
+                                similar variants of package '\(package.identity)' \
+                                found at '\(package.locationString)' and '\(existing.locationString)'. \
+                                using preferred variant '\(preferred.locationString)'
+                                """)
+                                if preferred.locationString != existing.locationString {
+                                    requiredIdentities.remove(existing)
+                                    requiredIdentities.insert(preferred, at: index)
                                 }
                             }
                         } else {

Sources/Workspace/Workspace+Pinning.swift

@@ -49,8 +49,8 @@ extension Workspace {
                 needsUpdate = true
             } else {
                 for dependency in dependenciesToPin {
-                    if let pin = storedPinStore.pins[comparingLocation: dependency.packageRef] {
-                        if pin.state != PinsStore.Pin(dependency)?.state {
+                    if let pin = storedPinStore.pins.first(where: { $0.value.packageRef.equalsIncludingLocation(dependency.packageRef) }) {
+                        if pin.value.state != PinsStore.Pin(dependency)?.state {
                             needsUpdate = true
                             break
                         }
@@ -180,12 +180,3 @@ extension PinsStore.PinState {
         }
     }
 }
-
-extension PinsStore.Pins {
-    subscript(comparingLocation package: PackageReference) -> PinsStore.Pin? {
-        if let pin = self[package.identity], pin.packageRef.equalsIncludingLocation(package) {
-            return pin
-        }
-        return .none
-    }
-}