feat: add --from flag, refactor source providers (#2610)

Signed-off-by: Keith Zantow <kzantow@gmail.com>

syft/internal/sourcemetadata/generated.go

@@ -6,5 +6,5 @@ import "github.com/anchore/syft/syft/source"
 
 // AllTypes returns a list of all source metadata types that syft supports (that are represented in the source.Description.Metadata field).
 func AllTypes() []any {
-	return []any{source.DirectorySourceMetadata{}, source.FileSourceMetadata{}, source.StereoscopeImageSourceMetadata{}}
+	return []any{source.DirectoryMetadata{}, source.FileMetadata{}, source.ImageMetadata{}}
 }

syft/internal/sourcemetadata/names.go

@@ -8,9 +8,9 @@ import (
 )
 
 var jsonNameFromType = map[reflect.Type][]string{
-	reflect.TypeOf(source.DirectorySourceMetadata{}):        {"directory", "dir"},
-	reflect.TypeOf(source.FileSourceMetadata{}):             {"file"},
-	reflect.TypeOf(source.StereoscopeImageSourceMetadata{}): {"image"},
+	reflect.TypeOf(source.DirectoryMetadata{}): {"directory", "dir"},
+	reflect.TypeOf(source.FileMetadata{}):      {"file"},
+	reflect.TypeOf(source.ImageMetadata{}):     {"image"},
 }
 
 func AllTypeNames() []string {

syft/internal/testutil/chdir.go

@@ -0,0 +1,26 @@
+package testutil
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Chdir(t *testing.T, dir string) {
+	t.Helper()
+
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("unable to get working directory: %v", err)
+	}
+
+	err = os.Chdir(dir)
+	if err != nil {
+		t.Fatalf("unable to chdir to '%s': %v", dir, err)
+	}
+
+	t.Cleanup(func() {
+		require.NoError(t, os.Chdir(wd))
+	})
+}