Make path and homedir related logic more robust

Add ability to pass OONI_HOME environment variable

internal/cli/root/root.go

@@ -6,6 +6,7 @@ import (
 	ooni "github.com/ooni/probe-cli"
 	"github.com/ooni/probe-cli/internal/log/handlers/batch"
 	"github.com/ooni/probe-cli/internal/log/handlers/cli"
+	"github.com/ooni/probe-cli/utils"
 	"github.com/prometheus/common/version"
 )
 
@@ -38,7 +39,7 @@ func init() {
 		Init = func() (*ooni.Context, error) {
 			var err error
 
-			homePath, err := ooni.GetOONIHome()
+			homePath, err := utils.GetOONIHome()
 			if err != nil {
 				return nil, err
 			}

internal/legacy/legacy.go

@@ -5,13 +5,13 @@ import (
 	"os"
 	"path/filepath"
 
-	homedir "github.com/mitchellh/go-homedir"
+	"github.com/ooni/probe-cli/utils/homedir"
 	"github.com/pkg/errors"
 	"gopkg.in/AlecAivazis/survey.v1"
 )
 
 // HomePath returns the path to the OONI Home
-func HomePath() (string, error) {
+func homePath() (string, error) {
 	home, err := homedir.Dir()
 	if err != nil {
 		return "", err
@@ -20,8 +20,11 @@ func HomePath() (string, error) {
 }
 
 // HomeExists returns true if a legacy home exists
-func HomeExists() (bool, error) {
-	home, err := HomePath()
+func homeExists() (bool, error) {
+	home, err := homePath()
+	if err == homedir.ErrNoHomeDir {
+		return false, nil
+	}
 	if err != nil {
 		return false, err
 	}
@@ -33,7 +36,7 @@ func HomeExists() (bool, error) {
 }
 
 // BackupHome the legacy home directory
-func BackupHome() error {
+func backupHome() error {
 	home, err := homedir.Dir()
 	if err != nil {
 		return errors.Wrap(err, "backing up home")
@@ -48,14 +51,14 @@ func BackupHome() error {
 
 // MaybeMigrateHome prompts the user if we should backup the legacy home
 func MaybeMigrateHome() error {
-	exists, err := HomeExists()
+	exists, err := homeExists()
 	if err != nil {
 		return err
 	}
 	if !exists {
 		return nil
 	}
-	home, err := HomePath()
+	home, err := homePath()
 	if err != nil {
 		return err
 	}
@@ -72,7 +75,7 @@ func MaybeMigrateHome() error {
 		}
 	} else {
 		logf("Backing up ~/.ooni to ~/.ooni-legacy")
-		if err := BackupHome(); err != nil {
+		if err := backupHome(); err != nil {
 			return err
 		}
 	}

nettests/nettests.go

@@ -43,7 +43,7 @@ type Controller struct {
 	msmtPath string // XXX maybe we can drop this and just use a temporary file
 }
 
-func getCaBundlePath() {
+func getCaBundlePath() string {
 	path := os.Getenv("SSL_CERT_FILE")
 	if path != "" {
 		return path

ooni.go

@@ -9,7 +9,6 @@ import (
 
 	"github.com/apex/log"
 	"github.com/jmoiron/sqlx"
-	homedir "github.com/mitchellh/go-homedir"
 	"github.com/ooni/probe-cli/config"
 	"github.com/ooni/probe-cli/internal/database"
 	"github.com/ooni/probe-cli/internal/legacy"
@@ -124,17 +123,6 @@ func NewContext(configPath string, homePath string) *Context {
 	}
 }
 
-// GetOONIHome returns the path to the OONI Home
-func GetOONIHome() (string, error) {
-	home, err := homedir.Dir()
-	if err != nil {
-		return "", err
-	}
-
-	path := filepath.Join(home, ".ooni")
-	return path, nil
-}
-
 // Config for the OONI Probe installation
 type Config struct {
 	// Private settings
@@ -179,7 +167,7 @@ func (c *Config) Unlock() {
 
 // Default config settings
 func (c *Config) Default() error {
-	home, err := GetOONIHome()
+	home, err := utils.GetOONIHome()
 	if err != nil {
 		return err
 	}

utils/paths.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"path/filepath"
 	"time"
+
+	"github.com/ooni/probe-cli/utils/homedir"
 )
 
 // RequiredDirs returns the required ooni home directories
@@ -46,3 +48,18 @@ func MakeResultsDir(home string, name string, ts time.Time) (string, error) {
 	}
 	return p, nil
 }
+
+// GetOONIHome returns the path to the OONI Home
+func GetOONIHome() (string, error) {
+	if ooniHome := os.Getenv("OONI_HOME"); ooniHome != "" {
+		return ooniHome, nil
+	}
+
+	home, err := homedir.Dir()
+	if err != nil {
+		return "", err
+	}
+
+	path := filepath.Join(home, ".ooni")
+	return path, nil
+}