Support CLI autocompletion for nested mounts (#8303)

* Support CLI autocompletion for nested mounts

* Add test for nested autocomplete prediction

command/base_predict.go

@@ -233,8 +233,18 @@ func (p *Predict) vaultPaths(includeFiles bool) complete.PredictFunc {
 
 		path := args.Last
 
+		// Trim path with potential mount
+		var relativePath string
+		for _, mount := range p.mounts() {
+			if strings.HasPrefix(path, mount) {
+				relativePath = strings.TrimPrefix(path, mount+"/")
+				break
+			}
+		}
+
+		// Predict path or mount depending on path separator
 		var predictions []string
-		if strings.Contains(path, "/") {
+		if strings.Contains(relativePath, "/") {
 			predictions = p.paths(path, includeFiles)
 		} else {
 			predictions = p.filter(p.mounts(), path)

command/base_predict_test.go

@@ -31,6 +31,12 @@ func TestPredictVaultPaths(t *testing.T) {
 	if _, err := client.Logical().Write("secret/zip/twoot", data); err != nil {
 		t.Fatal(err)
 	}
+	if err := client.Sys().Mount("level1a/level2a/level3a", &api.MountInput{Type: "kv"}); err != nil {
+		t.Fatal(err)
+	}
+	if err := client.Sys().Mount("level1a/level2a/level3b", &api.MountInput{Type: "kv"}); err != nil {
+		t.Fatal(err)
+	}
 
 	cases := []struct {
 		name         string
@@ -182,6 +188,18 @@ func TestPredictVaultPaths(t *testing.T) {
 			false,
 			[]string{"secret/zip/t"},
 		},
+		{
+			"multi_nested",
+			complete.Args{
+				All:  []string{"read", "level1a/level2a"},
+				Last: "level1a/level2a",
+			},
+			false,
+			[]string{
+				"level1a/level2a/level3a/",
+				"level1a/level2a/level3b/",
+			},
+		},
 	}
 
 	t.Run("group", func(t *testing.T) {