Added fallback when looking up home directory.

The problem is cross-compiling with cgo to darwin

config.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"os/user"
 	"path/filepath"
+	"runtime"
 )
 
 // Config hold configuration read from the configuration file
@@ -77,25 +78,25 @@ func doCheck(fn func() (bool, error), err error) (bool, error) {
 }
 
 func activeAWSConfigFile() (active bool, err error) {
-	usr, err := user.Current()
+	home, err := homeDir()
 	if err != nil {
 		return false, fmt.Errorf("unable to fetch user information: %v", err)
 	}
 
-	if _, err := os.Stat(filepath.Join(usr.HomeDir, awsConfDir, awsConfigFile)); os.IsNotExist(err) {
+	if _, err := os.Stat(filepath.Join(home, awsConfDir, awsConfigFile)); os.IsNotExist(err) {
 		return false, nil
 	}
 
 	return true, nil
 }
 
 func activeAWSCredentialsFile() (active bool, err error) {
-	usr, err := user.Current()
+	home, err := homeDir()
 	if err != nil {
-		return false, err
+		return false, fmt.Errorf("unable to fetch user information: %v", err)
 	}
 
-	if _, err := os.Stat(filepath.Join(usr.HomeDir, awsConfDir, awsCredentialsFile)); os.IsNotExist(err) {
+	if _, err := os.Stat(filepath.Join(home, awsConfDir, awsCredentialsFile)); os.IsNotExist(err) {
 		return false, nil
 	}
 
@@ -114,3 +115,33 @@ func activeAWSEnvironment() (active bool, err error) {
 	return false, nil
 
 }
+
+func homeDir() (homeDir string, err error) {
+	usr, err := user.Current()
+	if err == nil {
+		return usr.HomeDir, nil
+	}
+
+	// fallback to environemt variables
+	var home string
+	if runtime.GOOS == "windows" {
+		home = os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
+		if home != "" {
+			return home, nil
+		}
+
+		home = os.Getenv("USERPROFILE")
+		if home != "" {
+			return home, nil
+		}
+
+		return "", fmt.Errorf("fallback failed, set `USERPROFILE` environment variable")
+	}
+
+	home = os.Getenv("HOME")
+	if home != "" {
+		return home, nil
+	}
+
+	return "", fmt.Errorf("fallback failed, set `HOME` environment variable")
+}

main.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"log"
 	"os"
-	"os/user"
 	"path/filepath"
 
 	"github.com/bobziuchkovski/writ"
@@ -137,25 +136,25 @@ func setDefaultSocketAdress(adress string) string {
 		return adress
 	}
 
-	usr, err := user.Current()
+	home, err := homeDir()
 	if err != nil {
 		log.Fatalf("unable to extract user information: %v", err)
 	}
 
-	return filepath.Join(usr.HomeDir, domainSocketPath)
+	return filepath.Join(home, domainSocketPath)
 }
 
 func setDefaultConfigPath(path string) string {
 	if path != "" {
 		return path
 	}
 
-	usr, err := user.Current()
+	home, err := homeDir()
 	if err != nil {
 		log.Fatalf("unable to extract user information: %v", err)
 	}
 
-	return filepath.Join(usr.HomeDir, configFilePath)
+	return filepath.Join(home, configFilePath)
 }
 
 func main() {