Revert "chore: simplify getting configuration from env"

This reverts commit 4b5435b.

cmd/root.go

@@ -22,10 +22,13 @@ import (
 	"github.com/evcc-io/evcc/util/pipe"
 	"github.com/evcc-io/evcc/util/sponsor"
 	"github.com/evcc-io/evcc/util/telemetry"
+	"github.com/fatih/structs"
+	"github.com/jeremywohl/flatten"
 	_ "github.com/joho/godotenv/autoload"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
+	"golang.org/x/exp/maps"
 )
 
 const rebootDelay = 5 * time.Minute // delayed reboot on error
@@ -90,6 +93,12 @@ func initConfig() {
 	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 	viper.AutomaticEnv() // read in environment variables that match
 
+	// register all known config keys
+	flat, _ := flatten.Flatten(structs.Map(conf), "", flatten.DotStyle)
+	for _, v := range maps.Keys(flat) {
+		_ = viper.BindEnv(v)
+	}
+
 	// print version
 	util.LogLevel("info", nil)
 	log.INFO.Printf("evcc %s", server.FormattedVersion())

go.mod

@@ -84,7 +84,7 @@ require (
 	github.com/spf13/cobra v1.8.0
 	github.com/spf13/jwalterweatherman v1.1.0
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.18.1
+	github.com/spf13/viper v1.17.0
 	github.com/stretchr/testify v1.8.4
 	github.com/traefik/yaegi v0.15.1
 	github.com/tv42/httpunix v0.0.0-20191220191345-2ba4b9c3382c

go.sum

@@ -646,8 +646,8 @@ github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0
 github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/spf13/viper v1.18.1 h1:rmuU42rScKWlhhJDyXZRKJQHXFX02chSVW1IvkPGiVM=
-github.com/spf13/viper v1.18.1/go.mod h1:EKmWIqdnk5lOcmR72yw6hS+8OPYcwD0jteitLMVB+yk=
+github.com/spf13/viper v1.17.0 h1:I5txKw7MJasPL/BrfkbA0Jyo/oELqVmux4pR/UxOMfI=
+github.com/spf13/viper v1.17.0/go.mod h1:BmMMMLQXSbcHK6KAOiFLz0l5JHrU89OdIRHvsk0+yVI=
 github.com/spkg/bom v0.0.0-20160624110644-59b7046e48ad/go.mod h1:qLr4V1qq6nMqFKkMo8ZTx3f+BZEkzsRUY10Xsm2mwU0=
 github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=
 github.com/streadway/amqp v0.0.0-20190827072141-edfb9018d271/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=