actions: apt: Abstract apt commands into separate wrapper

The apt commands will also be used by the install-dpkg wrapper, prepare for
this by abstracting the generic apt commands into a wrapper class. Also
create a wrapper base class to be able to abstract common action commands
into generic functions.

Signed-off-by: Christopher Obbard <[email protected]>

actions/apt_action.go

@@ -28,6 +28,7 @@ package actions
 
 import (
 	"github.com/go-debos/debos"
+	"github.com/go-debos/debos/wrapper"
 )
 
 type AptAction struct {
@@ -46,50 +47,19 @@ func NewAptAction() *AptAction {
 func (apt *AptAction) Run(context *debos.DebosContext) error {
 	apt.LogStart()
 
-	aptConfig := []string{}
-
-	/* Don't show progress update percentages */
-	aptConfig = append(aptConfig, "-o=quiet::NoUpdate=1")
-
-	aptOptions := []string{"apt-get", "-y"}
-	aptOptions = append(aptOptions, aptConfig...)
-
-	if !apt.Recommends {
-		aptOptions = append(aptOptions, "--no-install-recommends")
-	}
-
-	if apt.Unauthenticated {
-		aptOptions = append(aptOptions, "--allow-unauthenticated")
-	}
-
-	aptOptions = append(aptOptions, "install")
-	aptOptions = append(aptOptions, apt.Packages...)
-
-	c := debos.NewChrootCommandForContext(*context)
-	c.AddEnv("DEBIAN_FRONTEND=noninteractive")
+	aptCommand := wrapper.NewAptCommand(*context, "apt")
 
 	if apt.Update {
-		cmd := []string{"apt-get"}
-		cmd = append(cmd, aptConfig...)
-		cmd = append(cmd, "update")
-
-		err := c.Run("apt", cmd...)
-		if err != nil {
+		if err := aptCommand.Update(); err != nil {
 			return err
 		}
 	}
 
-	err := c.Run("apt", aptOptions...)
-	if err != nil {
+	if err := aptCommand.Install(apt.Packages, apt.Recommends, apt.Unauthenticated); err != nil {
 		return err
 	}
 
-	cmd := []string{"apt-get"}
-	cmd = append(cmd, aptConfig...)
-	cmd = append(cmd, "clean")
-
-	err = c.Run("apt", cmd...)
-	if err != nil {
+	if err := aptCommand.Clean(); err != nil {
 		return err
 	}
 

wrapper/apt_wrapper.go

@@ -0,0 +1,49 @@
+/* Abstracts the apt command. */
+package wrapper
+
+import (
+	"github.com/go-debos/debos"
+)
+
+type AptCommand struct {
+	Wrapper
+}
+
+func NewAptCommand(context debos.DebosContext, label string) AptCommand {
+	command := "apt-get"
+
+	apt := AptCommand{
+		Wrapper: NewCommandWrapper(context, command, label),
+	}
+
+	apt.AddEnv("DEBIAN_FRONTEND=noninteractive")
+
+	/* Don't show progress update percentages */
+	apt.AppendGlobalArguments("-o=quiet::NoUpdate=1")
+
+	return apt
+}
+
+func (apt AptCommand) Clean() error {
+	return apt.Run("clean")
+}
+
+func (apt AptCommand) Install(packages []string, recommends bool, unauthenticated bool) error {
+	arguments := []string{"install", "--yes"}
+
+	if !recommends {
+		arguments = append(arguments, "--no-install-recommends")
+	}
+
+	if unauthenticated {
+		arguments = append(arguments, "--allow-unauthenticated")
+	}
+
+	arguments = append(arguments, packages...)
+
+	return apt.Run(arguments...)
+}
+
+func (apt AptCommand) Update() error {
+	return apt.Run("update")
+}

wrapper/wrapper.go

@@ -0,0 +1,41 @@
+/* Base class to abstract commonly used commands. */
+package wrapper
+
+import (
+	"github.com/go-debos/debos"
+)
+
+type Wrapper struct {
+	debos.Command
+	command    string
+	globalArgs []string
+	label      string
+}
+
+func NewCommandWrapper(context debos.DebosContext, command string, label string) Wrapper {
+	return Wrapper{
+		Command: debos.NewChrootCommandForContext(context),
+		command: command,
+		label:   label,
+	}
+}
+
+func (cmd *Wrapper) SetCommand(command string) {
+	cmd.command = command
+}
+
+func (cmd *Wrapper) AppendGlobalArguments(args string) {
+	cmd.globalArgs = append(cmd.globalArgs, args)
+}
+
+func (cmd *Wrapper) SetLabel(label string) {
+	cmd.label = label
+}
+
+func (cmd Wrapper) Run(additionalArgs ...string) error {
+	args := []string{cmd.command}
+	args = append(args, cmd.globalArgs...)
+	args = append(args, additionalArgs...)
+
+	return cmd.Command.Run(cmd.label, args...)
+}