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[signal] Set flags from environment variables (#3972)

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Philippe Vaucher 2025-06-14 00:08:34 +02:00 committed by GitHub
parent 089d442fb2
commit f595057a0b
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2 changed files with 36 additions and 0 deletions
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35
signal/cmd/env.go Normal file
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@ -0,0 +1,35 @@
package cmd
import (
"os"
"strings"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
// setFlagsFromEnvVars reads and updates flag values from environment variables with prefix NB_
func setFlagsFromEnvVars(cmd *cobra.Command) {
flags := cmd.PersistentFlags()
flags.VisitAll(func(f *pflag.Flag) {
newEnvVar := flagNameToEnvVar(f.Name, "NB_")
value, present := os.LookupEnv(newEnvVar)
if !present {
return
}
err := flags.Set(f.Name, value)
if err != nil {
log.Infof("unable to configure flag %s using variable %s, err: %v", f.Name, newEnvVar, err)
}
})
}
// flagNameToEnvVar converts flag name to environment var name adding a prefix,
// replacing dashes and making all uppercase (e.g. setup-keys is converted to NB_SETUP_KEYS according to the input prefix)
func flagNameToEnvVar(cmdFlag string, prefix string) string {
parsed := strings.ReplaceAll(cmdFlag, "-", "_")
upper := strings.ToUpper(parsed)
return prefix + upper
}

1
signal/cmd/run.go
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@ -303,4 +303,5 @@ func init() {
runCmd.Flags().StringVar(&signalLetsencryptDomain, "letsencrypt-domain", "", "a domain to issue Let's Encrypt certificate for. Enables TLS using Let's Encrypt. Will fetch and renew certificate, and run the server with TLS")
runCmd.Flags().StringVar(&signalCertFile, "cert-file", "", "Location of your SSL certificate. Can be used when you have an existing certificate and don't want a new certificate be generated automatically. If letsencrypt-domain is specified this property has no effect")
runCmd.Flags().StringVar(&signalCertKey, "cert-key", "", "Location of your SSL certificate private key. Can be used when you have an existing certificate and don't want a new certificate be generated automatically. If letsencrypt-domain is specified this property has no effect")
setFlagsFromEnvVars(runCmd)
}