Location order on packages should consider evidence annotations when sorting (#3720)

* fix: sorting locations should consider pkg evidence

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

* simplify location test options for comparison

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

internal/cmptest/common_options.go

@@ -8,11 +8,15 @@ import (
 	"github.com/anchore/syft/syft/pkg"
 )
 
-func DefaultCommonOptions() []cmp.Option {
-	return CommonOptions(nil, nil)
+func DefaultOptions() []cmp.Option {
+	return BuildOptions(nil, nil)
 }
 
-func CommonOptions(licenseCmp LicenseComparer, locationCmp LocationComparer) []cmp.Option {
+func DefaultIgnoreLocationLayerOptions() []cmp.Option {
+	return BuildOptions(LicenseComparerWithoutLocationLayer, LocationComparerWithoutLayer)
+}
+
+func BuildOptions(licenseCmp LicenseComparer, locationCmp LocationComparer) []cmp.Option {
 	if licenseCmp == nil {
 		licenseCmp = DefaultLicenseComparer
 	}
@@ -25,47 +29,9 @@ func CommonOptions(licenseCmp LicenseComparer, locationCmp LocationComparer) []c
 		cmpopts.IgnoreFields(pkg.Package{}, "id"), // note: ID is not deterministic for test purposes
 		cmpopts.SortSlices(pkg.Less),
 		cmpopts.SortSlices(DefaultRelationshipComparer),
-		cmp.Comparer(
-			func(x, y file.LocationSet) bool {
-				xs := x.ToSlice()
-				ys := y.ToSlice()
-
-				if len(xs) != len(ys) {
-					return false
-				}
-				for i, xe := range xs {
-					ye := ys[i]
-					if !locationCmp(xe, ye) {
-						return false
-					}
-				}
-
-				return true
-			},
-		),
-		cmp.Comparer(
-			func(x, y pkg.LicenseSet) bool {
-				xs := x.ToSlice()
-				ys := y.ToSlice()
-
-				if len(xs) != len(ys) {
-					return false
-				}
-				for i, xe := range xs {
-					ye := ys[i]
-					if !licenseCmp(xe, ye) {
-						return false
-					}
-				}
-
-				return true
-			},
-		),
-		cmp.Comparer(
-			locationCmp,
-		),
-		cmp.Comparer(
-			licenseCmp,
-		),
+		cmp.Comparer(buildSetComparer[file.Location, file.LocationSet](locationCmp)),
+		cmp.Comparer(buildSetComparer[pkg.License, pkg.LicenseSet](licenseCmp)),
+		cmp.Comparer(locationCmp),
+		cmp.Comparer(licenseCmp),
 	}
 }

internal/cmptest/license.go

@@ -10,20 +10,17 @@ import (
 type LicenseComparer func(x, y pkg.License) bool
 
 func DefaultLicenseComparer(x, y pkg.License) bool {
-	return cmp.Equal(x, y, cmp.Comparer(DefaultLocationComparer), cmp.Comparer(
-		func(x, y file.LocationSet) bool {
-			xs := x.ToSlice()
-			ys := y.ToSlice()
-			if len(xs) != len(ys) {
-				return false
-			}
-			for i, xe := range xs {
-				ye := ys[i]
-				if !DefaultLocationComparer(xe, ye) {
-					return false
-				}
-			}
-			return true
-		},
-	))
+	return cmp.Equal(
+		x, y,
+		cmp.Comparer(DefaultLocationComparer),
+		cmp.Comparer(buildSetComparer[file.Location, file.LocationSet](DefaultLocationComparer)),
+	)
+}
+
+func LicenseComparerWithoutLocationLayer(x, y pkg.License) bool {
+	return cmp.Equal(
+		x, y,
+		cmp.Comparer(LocationComparerWithoutLayer),
+		cmp.Comparer(buildSetComparer[file.Location, file.LocationSet](LocationComparerWithoutLayer)),
+	)
 }

internal/cmptest/location.go

@@ -11,3 +11,7 @@ type LocationComparer func(x, y file.Location) bool
 func DefaultLocationComparer(x, y file.Location) bool {
 	return cmp.Equal(x.Coordinates, y.Coordinates) && cmp.Equal(x.AccessPath, y.AccessPath)
 }
+
+func LocationComparerWithoutLayer(x, y file.Location) bool {
+	return cmp.Equal(x.Coordinates.RealPath, y.Coordinates.RealPath) && cmp.Equal(x.AccessPath, y.AccessPath)
+}

internal/cmptest/set.go

@@ -0,0 +1,24 @@
+package cmptest
+
+type slicer[T any] interface {
+	ToSlice() []T
+}
+
+func buildSetComparer[T any, S slicer[T]](l func(x, y T) bool) func(x, y S) bool {
+	return func(x, y S) bool {
+		xs := x.ToSlice()
+		ys := y.ToSlice()
+
+		if len(xs) != len(ys) {
+			return false
+		}
+		for i, xe := range xs {
+			ye := ys[i]
+			if !l(xe, ye) {
+				return false
+			}
+		}
+
+		return true
+	}
+}