cmd/podman: completion for --sysctl in create/run

Signed-off-by: Celso Henrique Souza Silva <celsohenrique367@gmail.com>

cmd/podman/common/completion.go

@@ -1954,3 +1954,35 @@ func AutocompleteSSH(cmd *cobra.Command, args []string, toComplete string) ([]st
 func AutocompleteHealthOnFailure(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 	return define.SupportedHealthCheckOnFailureActions, cobra.ShellCompDirectiveNoFileComp
 }
+
+// AutocompleteSysctl - autocomplete list all sysctl names
+func AutocompleteSysctl(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+	var completions []string
+	sysPath := "/proc/sys"
+
+	err := filepath.Walk(sysPath, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		if !info.IsDir() {
+			rel, err := filepath.Rel(sysPath, path)
+			if err != nil {
+				return err
+			}
+			sysctlName := strings.ReplaceAll(rel, string(os.PathSeparator), ".")
+
+			if strings.HasPrefix(sysctlName, toComplete) {
+				completions = append(completions, sysctlName)
+			}
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return nil, cobra.ShellCompDirectiveError
+	}
+
+	return completions, cobra.ShellCompDirectiveNoFileComp
+}

cmd/podman/common/create.go

@@ -733,8 +733,8 @@ func DefineCreateFlags(cmd *cobra.Command, cf *entities.ContainerCreateOptions,
 			sysctlFlagName, []string{},
 			"Sysctl options",
 		)
-		//TODO: Add function for sysctl completion.
-		_ = cmd.RegisterFlagCompletionFunc(sysctlFlagName, completion.AutocompleteNone)
+
+		_ = cmd.RegisterFlagCompletionFunc(sysctlFlagName, AutocompleteSysctl)
 
 		securityOptFlagName := "security-opt"
 		createFlags.StringArrayVar(

test/system/600-completion.bats

@@ -410,3 +410,15 @@ function _check_no_suggestions() {
     # cleanup container
     run_podman rm $ctrname
 }
+
+# bats test_tags=ci:parallel
+@test "podman run --sysctl completion for sysctl" {
+    skip_if_remote "sysctl option not working via remote"
+
+    run_completion run --sysctl net.
+
+    assert "$output" =~ "^net\." \
+      "Only suggestions with 'net.' should be present for podman run --sysctl net."
+
+    _check_completion_end NoFileComp
+}