stepwriter: Add DryRun

installer/stepwriter/dryrun.go

@@ -0,0 +1,63 @@
+// SPDX-FileCopyrightText: Fabio Forni <[email protected]>
+// SPDX-License-Identifier: MPL-2.0
+
+package stepwriter
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/livingsilver94/backee/installer"
+	"github.com/livingsilver94/backee/service"
+)
+
+type DryRun struct{}
+
+func (DryRun) Setup(script string) error {
+	_, err := fmt.Print(script)
+	return err
+}
+
+func (DryRun) InstallPackages(fullCmd []string) error {
+	_, err := fmt.Printf("Will run %q", strings.Join(fullCmd, " "))
+	return err
+}
+
+func (DryRun) SymlinkFile(dst service.FilePath, src string) error {
+	_, err := fmt.Printf("%s → %s", src, dst.Path)
+	if err != nil {
+		return err
+	}
+	if dst.Mode != 0 {
+		_, err = fmt.Printf(" with permission %o", dst.Mode)
+		if err != nil {
+			return err
+		}
+	}
+	_, err = fmt.Println()
+	return err
+}
+
+func (DryRun) CopyFile(dst service.FilePath, src installer.FileCopy) error {
+	_, err := fmt.Printf("Will write %q", dst.Path)
+	if err != nil {
+		return err
+	}
+	if dst.Mode != 0 {
+		_, err = fmt.Printf(" with permission %o", dst.Mode)
+		if err != nil {
+			return err
+		}
+	}
+	_, err = fmt.Println(" with the following content:")
+	if err != nil {
+		return err
+	}
+	_, err = fmt.Println(src)
+	return err
+}
+
+func (DryRun) Finalize(script string) error {
+	_, err := fmt.Print(script)
+	return err
+}