From 26f2b95168cab463e094a13991b8a486a68e684f Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Thu, 31 Dec 2015 14:18:50 +0100
Subject: all command line arguments can now be set using environment variables


diff --git a/src/helsinki.at/rhimport/conf.go b/src/helsinki.at/rhimport/conf.go
index d628563..59308a9 100644
--- a/src/helsinki.at/rhimport/conf.go
+++ b/src/helsinki.at/rhimport/conf.go
@@ -68,15 +68,15 @@ func (self *Config) readConfigFile() error {
 	return nil
 }
 
-func NewConfig(configfile, rdxportEndpoint, tempDir, localFetchDir *string) (conf *Config, err error) {
+func NewConfig(configfile, rdxportEndpoint, tempDir, localFetchDir string) (conf *Config, err error) {
 	conf = new(Config)
-	conf.configfile = *configfile
+	conf.configfile = configfile
 	if err = conf.readConfigFile(); err != nil {
 		return
 	}
-	conf.RDXportEndpoint = *rdxportEndpoint
-	conf.TempDir = *tempDir
-	conf.LocalFetchDir = *localFetchDir
+	conf.RDXportEndpoint = rdxportEndpoint
+	conf.TempDir = tempDir
+	conf.LocalFetchDir = localFetchDir
 	conf.ImportParamDefaults.Channels = 2
 	conf.ImportParamDefaults.NormalizationLevel = -12
 	conf.ImportParamDefaults.AutotrimLevel = 0
diff --git a/src/helsinki.at/rhimportd/main.go b/src/helsinki.at/rhimportd/main.go
index 3d5c0b1..c6090cb 100644
--- a/src/helsinki.at/rhimportd/main.go
+++ b/src/helsinki.at/rhimportd/main.go
@@ -26,6 +26,7 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"helsinki.at/rhimport"
 	"log"
 	"os"
@@ -40,13 +41,38 @@ var (
 	//rhdl = log.New(ioutil.Discard, "[rhimportd-dbg]\t", log.LstdFlags)
 )
 
+type envStringValue string
+
+func newEnvStringValue(key, dflt string) *envStringValue {
+	if envval, exists := os.LookupEnv(key); exists {
+		return (*envStringValue)(&envval)
+	} else {
+		return (*envStringValue)(&dflt)
+	}
+}
+
+func (s *envStringValue) Set(val string) error {
+	*s = envStringValue(val)
+	return nil
+}
+
+func (s *envStringValue) Get() interface{} { return string(*s) }
+
+func (s *envStringValue) String() string { return fmt.Sprintf("%s", *s) }
+
 func main() {
-	webAddr := flag.String("web-addr", ":4080", "addr:port to listen on")
-	telnetAddr := flag.String("telnet-addr", ":4023", "addr:port to listen on")
-	rdconf := flag.String("rdconf", "/etc/rd.conf", "path to the Rivendell config file")
-	rdxportUrl := flag.String("rdxport-url", "http://localhost/rd-bin/rdxport.cgi", "the url to the Rivendell web-api")
-	tempDir := flag.String("tmp-dir", os.TempDir(), "path to temporary files")
-	localFetchDir := flag.String("local-fetch-dir", os.TempDir(), "path to files that can be imported using local://")
+	webAddr := newEnvStringValue("RHIMPORTD_WEB_ADDR", "localhost:4080")
+	flag.Var(webAddr, "web-addr", "addr:port to listen on (environment: RHIMPORTD_WEB_ADDR)")
+	telnetAddr := newEnvStringValue("RHIMPORTD_TELNET_ADDR", "localhost:4023")
+	flag.Var(telnetAddr, "telnet-addr", "addr:port to listen on (environment: RHIMPORTD_TELNET_ADDR)")
+	rdconf := newEnvStringValue("RHIMPORTD_RD_CONF", "/etc/rd.conf")
+	flag.Var(rdconf, "rdconf", "path to the Rivendell config file (environment: RHIMPORTD_RD_CONF)")
+	rdxportUrl := newEnvStringValue("RHIMPORTD_RDXPORT_URL", "http://localhost/rd-bin/rdxport.cgi")
+	flag.Var(rdxportUrl, "rdxport-url", "the url to the Rivendell web-api (environment: RHIMPORTD_RDXPORT_URL)")
+	tempDir := newEnvStringValue("RHIMPORTD_TEMP_DIR", os.TempDir())
+	flag.Var(tempDir, "tmp-dir", "path to temporary files (environment: RHIMPORTD_TEMP_DIR)")
+	localFetchDir := newEnvStringValue("RHIMPORTD_LOCAL_FETCH_DIR", os.TempDir())
+	flag.Var(localFetchDir, "local-fetch-dir", "base path for local:// urls (environment: RHIMPORTD_LOCAL_FETCH_DIR)")
 	help := flag.Bool("help", false, "show usage")
 
 	flag.Parse()
@@ -55,7 +81,7 @@ func main() {
 		return
 	}
 
-	conf, err := rhimport.NewConfig(rdconf, rdxportUrl, tempDir, localFetchDir)
+	conf, err := rhimport.NewConfig(rdconf.Get().(string), rdxportUrl.Get().(string), tempDir.Get().(string), localFetchDir.Get().(string))
 	if err != nil {
 		rhl.Println("Error reading configuration:", err)
 		return
@@ -81,7 +107,7 @@ func main() {
 	go func() {
 		defer wg.Done()
 		rhl.Println("starting web-ctrl")
-		StartControlWeb(*webAddr, conf, rddb.GetInterface(), sessions.GetInterface())
+		StartControlWeb(webAddr.Get().(string), conf, rddb.GetInterface(), sessions.GetInterface())
 		rhl.Println("web-ctrl finished")
 	}()
 
@@ -89,7 +115,7 @@ func main() {
 	go func() {
 		defer wg.Done()
 		rhl.Println("starting telnet-ctrl")
-		StartControlTelnet(*telnetAddr, conf, rddb.GetInterface(), sessions.GetInterface())
+		StartControlTelnet(telnetAddr.Get().(string), conf, rddb.GetInterface(), sessions.GetInterface())
 		rhl.Println("telnet-ctrl finished")
 	}()
 
-- 
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