composer: use logrus hook instead of k8s sidecar

for splunk log forwarding
Fixes COMPOSER-2051

cmd/osbuild-composer/config.go

@@ -18,6 +18,9 @@ type ComposerConfigFile struct {
 	LogLevel     string          `toml:"log_level"`
 	LogFormat    string          `toml:"log_format"`
 	DNFJson      string          `toml:"dnf-json"`
+	SplunkHost   string          `env:"SPLUNK_HEC_HOST"`
+	SplunkPort   string          `env:"SPLUNK_HEC_PORT"`
+	SplunkToken  string          `env:"SPLUNK_HEC_TOKEN"`
 }
 
 type KojiAPIConfig struct {

cmd/osbuild-composer/main.go

@@ -1,10 +1,12 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"os"
 
 	"github.com/coreos/go-systemd/activation"
+	slogger "github.com/osbuild/osbuild-composer/pkg/splunk_logger"
 	"github.com/sirupsen/logrus"
 	"github.com/sirupsen/logrus/hooks/syslog"
 )
@@ -60,6 +62,15 @@ func main() {
 		logrus.Fatalf("Error printing configuration: %v", err)
 	}
 
+	if config.SplunkHost != "" {
+		hook, err := slogger.NewSplunkHook(context.Background(), config.SplunkHost, config.SplunkPort, config.SplunkToken, "composer")
+
+		if err != nil {
+			panic(err)
+		}
+		logrus.AddHook(hook)
+	}
+
 	stateDir, ok := os.LookupEnv("STATE_DIRECTORY")
 	if !ok {
 		logrus.Fatal("STATE_DIRECTORY is not set. Is the service file missing StateDirectory=?")