Add --env-file param and improve overall env-var loading

app/cli.go

@@ -2,6 +2,7 @@ package app
 
 import (
 	"context"
+	"fmt"
 
 	authCommands "github.com/cortezaproject/corteza-server/auth/commands"
 	federationCommands "github.com/cortezaproject/corteza-server/federation/commands"
@@ -14,9 +15,27 @@ import (
 // InitCLI function initializes basic Corteza subsystems
 // and sets-up the command line interface
 func (app *CortezaApp) InitCLI() {
-	ctx := cli.Context()
+	var (
+		ctx = cli.Context()
 
-	app.Command = cli.RootCommand(nil)
+		// path to all environmental files (or locations with .env file)
+		// filled from flag values
+		envs = []string{"."}
+	)
+
+	app.Command = cli.RootCommand(func() error {
+		if err := cli.LoadEnv(envs...); err != nil {
+			return fmt.Errorf("failed to load environmental variables: %w", err)
+		}
+
+		return nil
+	})
+
+	app.Command.Flags().StringSliceVar(&envs, "env-file", nil,
+		"Load environmental variables from files and directories containing .env file.\n"+
+			"Values from loaded files DO NOT override existing variables from the environment.\n"+
+			"This flag can be used multiple times, values are loaded from all provided locations.\n"+
+			"If no paths are provided, corteza loads .env file from the current directory (equivalent to --env-file .)")
 
 	serveCmd := cli.ServeCommand(func() (err error) {
 		if err = app.Activate(ctx); err != nil {
@@ -62,6 +81,7 @@ func (app *CortezaApp) InitCLI() {
 		provisionCmd,
 		authCommands.General(app, app.Opt.Auth),
 		federationCommands.Sync(app),
+		cli.EnvCommand(),
 		cli.VersionCommand(),
 	)
 

pkg/cli/env.go

@@ -0,0 +1,41 @@
+package cli
+
+import (
+	"os"
+	"path"
+	"sort"
+
+	"github.com/joho/godotenv"
+	"github.com/spf13/cobra"
+)
+
+// LoadEnv loads env-variables (KEY=VAL) from provided files and paths (by searching for .env file in the given path)
+//
+// Please not that loaded values DO NOT OVERRIDE the existing environmental variables
+func LoadEnv(pp ...string) error {
+	// preparse the input and try to figure out if .env should be appended
+	for i, p := range pp {
+		if s, err := os.Stat(p); err != nil {
+			return err
+		} else if s.IsDir() {
+			pp[i] = path.Join(p, ".env")
+		}
+	}
+
+	return godotenv.Load(pp...)
+}
+
+// EnvCommand outputs all loaded env variables
+func EnvCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:  "env",
+		Long: "Outputs list (sorted by key) of of all environmental variables. Can be used for diagnosis and debugging",
+		Run: func(cmd *cobra.Command, args []string) {
+			kv := os.Environ()
+			sort.Strings(kv)
+			for _, l := range kv {
+				cmd.Println(l)
+			}
+		},
+	}
+}

pkg/logger/logger.go

@@ -4,9 +4,6 @@ import (
 	"os"
 	"time"
 
-	// Make sure we read the ENV from .env
-	_ "github.com/joho/godotenv/autoload"
-
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"