Update lockfile api for package source

Author: LucilleH

internal/devpkg/package.go

@@ -403,7 +403,12 @@ func (p *Package) Versioned() string {
 }
 
 func (p *Package) IsLegacy() bool {
-	return p.isDevboxPackage() && !p.isVersioned() && p.lockfile.Source(p.Raw) == ""
+	var packageSource = ""
+	if p.lockfile.Get(p.Raw) != nil {
+		packageSource = p.lockfile.Get(p.Raw).Source
+	}
+
+	return p.isDevboxPackage() && !p.isVersioned() && packageSource == ""
 }
 
 func (p *Package) LegacyToVersioned() string {

internal/devpkg/package_test.go

@@ -119,8 +119,8 @@ func (l *lockfile) LegacyNixpkgsPath(pkg string) string {
 	)
 }
 
-func (l *lockfile) Source(pkg string) string {
-	return ""
+func (l *lockfile) Get(pkg string) *lock.Package {
+	return nil
 }
 
 func (l *lockfile) Resolve(pkg string) (*lock.Package, error) {

internal/lock/interfaces.go

@@ -11,8 +11,8 @@ type devboxProject interface {
 }
 
 type Locker interface {
+	Get(string) *Package
 	LegacyNixpkgsPath(string) string
 	ProjectDir() string
 	Resolve(string) (*Package, error)
-	Source(string) string
 }

internal/lock/lockfile.go

@@ -130,12 +130,12 @@ func (l *File) LegacyNixpkgsPath(pkg string) string {
 	)
 }
 
-func (l *File) Source(pkg string) string {
+func (l *File) Get(pkg string) *Package {
 	entry, hasEntry := l.Packages[pkg]
 	if !hasEntry || entry.Resolved == "" {
-		return ""
+		return nil
 	}
-	return entry.Source
+	return entry
 }
 
 // This probably belongs in input.go but can't add it there because it will