Allow to specify the config file through ARDUINO_CONFIG_FILE env

docs/configuration.md

@@ -127,6 +127,7 @@ The configuration file must be named `arduino-cli`, with the appropriate file ex
 Configuration files in the following locations are recognized by Arduino CLI:
 
 1. Location specified by the [`--config-file`][arduino cli command reference] command line flag
+1. Location specified by the `ARDUINO_CONFIG_FILE` environment variable
 1. Arduino CLI data directory (as configured by `directories.data`)
 
 If multiple configuration files are present, the one highest on the above list is used. Configuration files are not

internal/cli/configuration/configuration.go

@@ -133,9 +133,10 @@ func GetDefaultBuiltinLibrariesDir() string {
 	return filepath.Join(getDefaultArduinoDataDir(), "libraries")
 }
 
-// FindConfigFileInArgs returns the config file path using the
-// argument '--config-file' (if specified) or looking in the current working dir
-func FindConfigFileInArgs(args []string) string {
+// FindConfigFileInArgsFallbackOnEnv returns the config file path using the
+// argument '--config-file' (if specified), if empty looks for the ARDUINO_CONFIG_FILE env,
+// or looking in the current working dir
+func FindConfigFileInArgsFallbackOnEnv(args []string) string {
 	// Look for '--config-file' argument
 	for i, arg := range args {
 		if arg == "--config-file" {
@@ -144,5 +145,5 @@ func FindConfigFileInArgs(args []string) string {
 			}
 		}
 	}
-	return ""
+	return os.Getenv("ARDUINO_CONFIG_FILE")
 }

internal/cli/configuration/configuration_test.go

@@ -60,15 +60,23 @@ func TestInit(t *testing.T) {
 }
 
 func TestFindConfigFile(t *testing.T) {
-	configFile := FindConfigFileInArgs([]string{"--config-file"})
+	configFile := FindConfigFileInArgsFallbackOnEnv([]string{"--config-file"})
 	require.Equal(t, "", configFile)
 
-	configFile = FindConfigFileInArgs([]string{"--config-file", "some/path/to/config"})
+	configFile = FindConfigFileInArgsFallbackOnEnv([]string{"--config-file", "some/path/to/config"})
 	require.Equal(t, "some/path/to/config", configFile)
 
-	configFile = FindConfigFileInArgs([]string{"--config-file", "some/path/to/config/arduino-cli.yaml"})
+	configFile = FindConfigFileInArgsFallbackOnEnv([]string{"--config-file", "some/path/to/config/arduino-cli.yaml"})
 	require.Equal(t, "some/path/to/config/arduino-cli.yaml", configFile)
 
-	configFile = FindConfigFileInArgs([]string{})
+	configFile = FindConfigFileInArgsFallbackOnEnv([]string{})
 	require.Equal(t, "", configFile)
+
+	t.Setenv("ARDUINO_CONFIG_FILE", "some/path/to/config")
+	configFile = FindConfigFileInArgsFallbackOnEnv([]string{})
+	require.Equal(t, "some/path/to/config", configFile)
+
+	// when both env and flag are specified flag takes precedence
+	configFile = FindConfigFileInArgsFallbackOnEnv([]string{"--config-file", "flag/path"})
+	require.Equal(t, "flag/path", configFile)
 }

internal/docsgen/main.go

@@ -31,7 +31,7 @@ func main() {
 
 	os.MkdirAll(os.Args[1], 0755) // Create the output folder if it doesn't already exist
 
-	configuration.Settings = configuration.Init(configuration.FindConfigFileInArgs(os.Args))
+	configuration.Settings = configuration.Init(configuration.FindConfigFileInArgsFallbackOnEnv(os.Args))
 	cli := cli.NewCommand()
 	cli.DisableAutoGenTag = true // Disable addition of auto-generated date stamp
 	err := doc.GenMarkdownTree(cli, os.Args[1])

internal/integrationtest/config/config_test.go

@@ -16,9 +16,11 @@
 package config_test
 
 import (
+	"path/filepath"
 	"testing"
 
 	"github.com/arduino/arduino-cli/internal/integrationtest"
+	"github.com/arduino/go-paths-helper"
 	"github.com/stretchr/testify/require"
 	"go.bug.st/testifyjson/requirejson"
 	"gopkg.in/yaml.v3"
@@ -815,3 +817,40 @@ func TestDelete(t *testing.T) {
 	require.NotContains(t, configLines, "additional_urls")
 	require.NotContains(t, configLines, "board_manager")
 }
+
+func TestInitializationOrderOfConfigThroughFlagAndEnv(t *testing.T) {
+	env, cli := integrationtest.CreateArduinoCLIWithEnvironment(t)
+	defer env.CleanUp()
+
+	createConfig := func(path *paths.Path, content string) {
+		f, err := path.Create()
+		require.NoError(t, err)
+		_, err = f.WriteString(content)
+		require.NoError(t, err)
+	}
+	tmp := t.TempDir()
+	cliConfig, envConfig := paths.New(filepath.Join(tmp, "cli.yaml")), paths.New(filepath.Join(tmp, "env.yaml"))
+	createConfig(cliConfig, `cli-test: "test"`)
+	createConfig(envConfig, `env-test: "test"`)
+
+	// No flag nor env specified.
+	stdout, _, err := cli.Run("config", "dump", "--format", "json")
+	require.NoError(t, err)
+	requirejson.NotEmpty(t, stdout)
+
+	// Flag specified
+	stdout, _, err = cli.Run("config", "dump", "--config-file", cliConfig.String(), "--format", "json")
+	require.NoError(t, err)
+	requirejson.Contains(t, stdout, `{"config":{ "cli-test": "test" }}`)
+
+	// Env specified
+	customEnv := map[string]string{"ARDUINO_CONFIG_FILE": envConfig.String()}
+	stdout, _, err = cli.RunWithCustomEnv(customEnv, "config", "dump", "--format", "json")
+	require.NoError(t, err)
+	requirejson.Contains(t, stdout, `{"config":{ "env-test": "test" }}`)
+
+	// Flag and env specified, flag takes precedence
+	stdout, _, err = cli.RunWithCustomEnv(customEnv, "config", "dump", "--config-file", cliConfig.String(), "--format", "json")
+	require.NoError(t, err)
+	requirejson.Contains(t, stdout, `{"config":{ "cli-test": "test" }}`)
+}

internal/integrationtest/monitor/monitor_grpc_test.go

@@ -58,7 +58,7 @@ func TestMonitorGRPCClose(t *testing.T) {
 	tmpFileMatcher := regexp.MustCompile("Tmpfile: (.*)\n")
 	{
 		ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
-		mon, err := grpcInst.Monitor(ctx, ports[0].Port)
+		mon, err := grpcInst.Monitor(ctx, ports[0].GetPort())
 		var tmpFile *paths.Path
 		for {
 			monResp, err := mon.Recv()
@@ -85,7 +85,7 @@ func TestMonitorGRPCClose(t *testing.T) {
 	{
 		// Keep a timeout to allow the test to exit in any case
 		ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
-		mon, err := grpcInst.Monitor(ctx, ports[0].Port)
+		mon, err := grpcInst.Monitor(ctx, ports[0].GetPort())
 		var tmpFile *paths.Path
 		for {
 			monResp, err := mon.Recv()

main.go

@@ -25,7 +25,7 @@ import (
 )
 
 func main() {
-	configuration.Settings = configuration.Init(configuration.FindConfigFileInArgs(os.Args))
+	configuration.Settings = configuration.Init(configuration.FindConfigFileInArgsFallbackOnEnv(os.Args))
 	i18n.Init(configuration.Settings.GetString("locale"))
 	arduinoCmd := cli.NewCommand()
 	if err := arduinoCmd.Execute(); err != nil {