Account for backwards compatibility of ARM

build.go

@@ -689,10 +689,14 @@ func archMatches(architectures []string) bool {
 		return true
 	}
 
-	if slices.Contains(architectures, "arm") {
-		architectures = append(architectures, cpu.ARMVariant())
+	for _, arch := range architectures {
+		if strings.HasPrefix(arch, "arm") {
+			architectures = append(architectures, cpu.CompatibleARMReverse(arch)...)
+		}
 	}
 
+	fmt.Println(architectures)
+
 	return slices.Contains(architectures, cpu.Arch())
 }
 

internal/cpu/cpu.go

@@ -44,11 +44,55 @@ func ARMVariant() string {
 	}
 }
 
+// CompatibleARM returns all the compatible ARM variants given the system architecture
+func CompatibleARM(variant string) []string {
+	switch variant {
+	case "arm7", "arm":
+		return []string{"arm7", "arm6", "arm5"}
+	case "arm6":
+		return []string{"arm6", "arm5"}
+	case "arm5":
+		return []string{"arm5"}
+	default:
+		return []string{variant}
+	}
+}
+
+// CompatibleARMReverse returns all the compatible ARM variants given the package's architecture
+func CompatibleARMReverse(variant string) []string {
+	switch variant {
+	case "arm7":
+		return []string{"arm7"}
+	case "arm6":
+		return []string{"arm6", "arm7"}
+	case "arm5", "arm":
+		return []string{"arm5", "arm6", "arm7"}
+	default:
+		return []string{variant}
+	}
+}
+
 // Arch returns the canonical CPU architecture of the system
 func Arch() string {
-	arch := runtime.GOARCH
+	arch := os.Getenv("LURE_ARCH")
+	if arch == "" {
+		arch = runtime.GOARCH
+	}
 	if arch == "arm" {
 		arch = ARMVariant()
 	}
 	return arch
 }
+
+// Arches returns all the architectures the system is compatible with
+func Arches() []string {
+	arch := os.Getenv("LURE_ARCH")
+	if arch == "" {
+		arch = runtime.GOARCH
+	}
+	if strings.HasPrefix(arch, "arm") {
+		return append(CompatibleARM(arch), "arm")
+	} else {
+		return []string{Arch()}
+	}
+}

internal/overrides/overrides.go

@@ -20,7 +20,6 @@ package overrides
 
 import (
 	"reflect"
-	"runtime"
 	"strings"
 
 	"go.elara.ws/lure/distro"
@@ -59,13 +58,7 @@ func Resolve(info *distro.OSRelease, opts *Opts) ([]string, error) {
 		return nil, err
 	}
 
-	architectures := []string{runtime.GOARCH}
-
-	if runtime.GOARCH == "arm" {
-		// More specific goes first
-		architectures[0] = cpu.ARMVariant()
-		architectures = append(architectures, "arm")
-	}
+	architectures := cpu.Arches()
 
 	distros := []string{info.ID}
 	if opts.LikeDistros {