feat[close #106]: Prevent pkg apply to apply changes if already applied

cmd/pkg.go

@@ -155,6 +155,17 @@ func pkg(cmd *cobra.Command, args []string) error {
 		cmdr.Info.Printf(abroot.Trans("pkg.listMsg"), added, removed)
 		return nil
 	case "apply":
+		unstaged, err := pkgM.GetUnstagedPackages()
+		if err != nil {
+			cmdr.Error.Println(err)
+			return err
+		}
+
+		if len(unstaged) == 0 {
+			cmdr.Info.Println(abroot.Trans("pkg.noChanges"))
+			return nil
+		}
+
 		aBsys, err := core.NewABSystem()
 		if err != nil {
 			cmdr.Error.Println(err)

locales/en.yml

@@ -47,6 +47,7 @@ pkg:
   applyFailed: "Apply command failed: %s\n"
   removedMsg: "Package(s) %s removed.\n"
   listMsg: "Added packages:\n%s\nRemoved packages:\n%s\n"
+  noChanges: "No changes to apply."
   dryRunFlag: "perform a dry run of the operation"
   forceEnableUserAgreementFlag: "force enable user agreement, for embedded systems"
   agreementMsg: "To utilize ABRoot's abroot pkg command, explicit user agreement is required. This command facilitates package installations but introduces non-deterministic elements, impacting system trustworthiness. By consenting, you acknowledge and accept these implications, confirming your awareness of the command's potential impact on system behavior. [y/N]: "