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fix: Allow overriding env variable names, restore CODER_TELEMETRY #4894

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fix: Allow overriding env variable names, restore CODER_TELEMETRY #4894

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69326d1
fix: Disable viper auto-env to avoid assigning to parent structs
mafredri Nov 4, 2022
2f4ac30
Add test for wrong-env breakage
mafredri Nov 4, 2022
6408959
fix: Allow overriding env variable names, restore CODER_TELEMETRY
mafredri Nov 4, 2022
6aebb36
Ensure Env field is populated
mafredri Nov 4, 2022
7cb8a98
Add test for env field population
mafredri Nov 4, 2022
96785a7
Comment
mafredri Nov 4, 2022
6aecff8
Restore CODER_TRACE as well
mafredri Nov 4, 2022
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fix: Disable viper auto-env to avoid assigning to parent structs 
The viper automatic env mapping and BindEnv were both creating mappings
like `vip.BindEnv("telemetry", "CODER_TELEMETRY")` which we don't want
since `DeploymentConfig.Telemetry` is a struct housing fields.

For some reason, this was causing `DeploymentConfig.Telemetry.URL` to
**not** be assigned its default value when `CODER_TELEMETRY=false` was
set as an environment variable.

Potentially we would want `"telemetry.enable"` to be mapped to
`"CODER_TELEMETRY"` for simplicity. But that behavior is not changed by
this commit.

Arguably, we could remove `vip.SetEnvPrefix` and `vip.SetEnvKeyReplacer`
as well since we're manually controlling all environment variable names
via `formatEnv`.
  • Loading branch information
@mafredri
mafredri committed Nov 4, 2022
commit 69326d1fcd97a07d9065819ce32e9e258befdaa5
23 changes: 18 additions & 5 deletions cli/deployment/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -370,7 +370,6 @@ func Config(flagset *pflag.FlagSet, vip *viper.Viper) (*codersdk.DeploymentConfi
return nil, xerrors.Errorf("get global config from flag: %w", err)
}
vip.SetEnvPrefix("coder")
vip.AutomaticEnv()

if flg != "" {
vip.SetConfigFile(flg + "/server.yaml")
Expand All @@ -393,21 +392,26 @@ func setConfig(prefix string, vip *viper.Viper, target interface{}) {
typ = val.Type()
}

// Manually bind to env to support CODER_$INDEX_$FIELD format for structured slices.
_ = vip.BindEnv(prefix, formatEnv(prefix))

// Ensure that we only bind env variables to proper fields,
// otherwise Viper will get confused if the parent struct is
// assigned a value.
if strings.HasPrefix(typ.Name(), "DeploymentConfigField[") {
value := val.FieldByName("Value").Interface()
switch value.(type) {
case string:
vip.MustBindEnv(prefix, formatEnv(prefix))
val.FieldByName("Value").SetString(vip.GetString(prefix))
case bool:
vip.MustBindEnv(prefix, formatEnv(prefix))
val.FieldByName("Value").SetBool(vip.GetBool(prefix))
case int:
vip.MustBindEnv(prefix, formatEnv(prefix))
val.FieldByName("Value").SetInt(int64(vip.GetInt(prefix)))
case time.Duration:
vip.MustBindEnv(prefix, formatEnv(prefix))
val.FieldByName("Value").SetInt(int64(vip.GetDuration(prefix)))
case []string:
vip.MustBindEnv(prefix, formatEnv(prefix))
// As of October 21st, 2022 we supported delimiting a string
// with a comma, but Viper only supports with a space. This
// is a small hack around it!
Expand All @@ -422,6 +426,7 @@ func setConfig(prefix string, vip *viper.Viper, target interface{}) {
}
val.FieldByName("Value").Set(reflect.ValueOf(value))
case []codersdk.GitAuthConfig:
// Do not bind to CODER_GITAUTH, instead bind to CODER_GITAUTH_0_*, etc.
values := readSliceFromViper[codersdk.GitAuthConfig](vip, prefix, value)
val.FieldByName("Value").Set(reflect.ValueOf(values))
default:
Expand Down Expand Up @@ -471,6 +476,11 @@ func readSliceFromViper[T any](vip *viper.Viper, key string, value any) []T {
prop = fve.Tag.Get("yaml")
}
configKey := fmt.Sprintf("%s.%d.%s", key, entry, prop)

// Ensure the env entry for this key is registered
// before checking value.
vip.MustBindEnv(configKey, formatEnv(configKey))

value := vip.Get(configKey)
if value == nil {
continue
Expand Down Expand Up @@ -502,7 +512,6 @@ func NewViper() *viper.Viper {
dc := newConfig()
vip := viper.New()
vip.SetEnvPrefix("coder")
vip.AutomaticEnv()
vip.SetEnvKeyReplacer(strings.NewReplacer("-", "_", ".", "_"))

setViperDefaults("", vip, dc)
Expand Down Expand Up @@ -566,6 +575,10 @@ func setFlags(prefix string, flagset *pflag.FlagSet, vip *viper.Viper, target in
hidden := val.FieldByName("Hidden").Bool()
value := val.FieldByName("Default").Interface()

// Allow currently set environment variables
// to override default values in help output.
vip.MustBindEnv(prefix, formatEnv(prefix))

switch value.(type) {
case string:
_ = flagset.StringP(flg, shorthand, vip.GetString(prefix), usage)
Expand Down