Add XDS_SERVER_ROOT_CFG_DIR env var support

By default xds-server uses $HOME/.xds/server directory to save all
config. This changes allows user to change this root directory by
defining XDS_SERVER_ROOT_CFG_DIR environment variable.

Change-Id: Iebde8dcf2d27b77671c7332bac04295d31659e24
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

2 files changed, 26 insertions, 16 deletions

diff --git a/lib/xdsconfig/config.go b/lib/xdsconfig/config.go
index ee20bd2..ca5b5cb 100644
--- a/lib/xdsconfig/config.go
+++ b/lib/xdsconfig/config.go
@@ -21,6 +21,8 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"os/user"
+	"path"
 	"path/filepath"
 
 	common "gerrit.automotivelinux.org/gerrit/src/xds/xds-common.git/golib"
@@ -53,8 +55,8 @@ type Options struct {
 const (
 	DefaultAPIVersion    = "1"
 	DefaultPort          = "8000"
-	DefaultShareDir      = "${HOME}/.xds/server/projects"
-	DefaultSTHomeDir     = "${HOME}/.xds/server/syncthing-config"
+	DefaultShareDir      = "projects"
+	DefaultSTHomeDir     = "syncthing-config"
 	DefaultSdkScriptsDir = "${EXEPATH}/sdks"
 	DefaultSdkDbUpdate   = "startup"
 )
@@ -63,12 +65,12 @@ const (
 func Init(cliCtx *cli.Context, log *logrus.Logger) (*Config, error) {
 	var err error
 
-	dfltShareDir := DefaultShareDir
-	dfltSTHomeDir := DefaultSTHomeDir
-	if resDir, err := common.ResolveEnvVar(DefaultShareDir); err == nil {
+	dfltShareDir := path.Join(ConfigRootDir(), DefaultShareDir)
+	dfltSTHomeDir := path.Join(ConfigRootDir(), DefaultSTHomeDir)
+	if resDir, err := common.ResolveEnvVar(dfltShareDir); err == nil {
 		dfltShareDir = resDir
 	}
-	if resDir, err := common.ResolveEnvVar(DefaultSTHomeDir); err == nil {
+	if resDir, err := common.ResolveEnvVar(dfltSTHomeDir); err == nil {
 		dfltSTHomeDir = resDir
 	}
 
@@ -157,3 +159,18 @@ func Init(cliCtx *cli.Context, log *logrus.Logger) (*Config, error) {
 
 	return &c, nil
 }
+
+// ConfigRootDir return the root directory where xds server save all config files
+func ConfigRootDir() string {
+	root := "$HOME"
+	if usr, err := user.Current(); err == nil {
+		root = usr.HomeDir
+	}
+
+	// Default $HOME/.xds/server but may be changed by an env variable
+	if envVar, envDef := os.LookupEnv("XDS_SERVER_ROOT_CFG_DIR"); envDef {
+		root = envVar
+	}
+
+	return path.Join(root, "/.xds/server")
+}
diff --git a/lib/xdsconfig/fileconfig.go b/lib/xdsconfig/fileconfig.go
index 86f39b5..b786a24 100644
--- a/lib/xdsconfig/fileconfig.go
+++ b/lib/xdsconfig/fileconfig.go
@@ -28,9 +28,6 @@ import (
 	common "gerrit.automotivelinux.org/gerrit/src/xds/xds-common.git/golib"
 )
 
-// ConfigDir Directory in user HOME directory where xds config will be saved
-var ConfigDir = path.Join(".xds", "server")
-
 const (
 	// GlobalConfigFilename Global config filename
 	GlobalConfigFilename = "server-config.json"
@@ -74,8 +71,8 @@ func readGlobalConfig(c *Config, confFile string) error {
 	if confFile != "" {
 		searchIn = append(searchIn, confFile)
 	}
-	if usr, err := user.Current(); err == nil {
-		searchIn = append(searchIn, path.Join(usr.HomeDir, ConfigDir, GlobalConfigFilename))
+	if _, err := user.Current(); err == nil {
+		searchIn = append(searchIn, path.Join(ConfigRootDir(), GlobalConfigFilename))
 	}
 
 	searchIn = append(searchIn, "/etc/xds/server/server-config.json")
@@ -172,11 +169,7 @@ func readGlobalConfig(c *Config, confFile string) error {
 }
 
 func configFilenameGet(cfgFile string) (string, error) {
-	usr, err := user.Current()
-	if err != nil {
-		return "", err
-	}
-	return path.Join(usr.HomeDir, ConfigDir, cfgFile), nil
+	return path.Join(ConfigRootDir(), cfgFile), nil
 }
 
 // FoldersConfigFilenameGet Return the FoldersConfig filename