only open dev/null once to try to fix "too many open files"

go.mod

@@ -3,9 +3,8 @@ module gitlab.ssec.wisc.edu/brucef/chart-server
 go 1.12
 
 require (
-	github.com/gorilla/context v1.1.1
+	github.com/gorilla/context v1.1.1 // indirect
 	github.com/gorilla/handlers v1.4.0
 	github.com/gorilla/mux v1.6.2
-	github.com/pkg/errors v0.8.0
 	github.com/spf13/pflag v1.0.2
 )

go.sum

+github.com/gorilla/context v1.1.1 h1:AWwleXJkX/nhcU9bZSnZoi3h/qGYqQAGhq6zZe/aQW8=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/handlers v1.4.0 h1:XulKRWSQK5uChr4pEgSE4Tc/OcmnU9GJuSwdog/tZsA=
 github.com/gorilla/handlers v1.4.0/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
 github.com/gorilla/mux v1.6.2 h1:Pgr17XVTNXAk3q/r4CpKzC5xBM/qW1uVLV+IhRZpIIk=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
-github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
-github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/spf13/pflag v1.0.2 h1:Fy0orTDgHdbnzHcsOgfCN4LtHf0ec3wwtiwJqwvf3Gc=
 github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=

main.go

@@ -12,10 +12,19 @@ import (
 
 	"github.com/gorilla/handlers"
 	"github.com/gorilla/mux"
-	"github.com/pkg/errors"
 	"github.com/spf13/pflag"
 )
 
+var devnull *os.File
+
+func init() {
+	f, err := os.OpenFile(os.DevNull, 0, 0)
+	if err != nil {
+		panic(fmt.Sprintf("unable to open %s: %s", os.DevNull, err))
+	}
+	devnull = f
+}
+
 func httpFail(w http.ResponseWriter, r *http.Request, msg string, err error) {
 	log.Printf("InternalServerError: %s: %s: %s", msg, err, r.URL)
 	http.Error(w, msg, http.StatusInternalServerError)
@@ -24,9 +33,10 @@ func httpFail(w http.ResponseWriter, r *http.Request, msg string, err error) {
 func updateIndex(url, dir string) error {
 	cmd := exec.Command("helm", "repo", "index", "--url", url, dir)
 	cmd.Stderr = os.Stderr
+	cmd.Stdout = devnull
 	err := cmd.Run()
 	if err != nil {
-		return errors.Wrapf(err, "running helm")
+		return fmt.Errorf("running helm: %w", err)
 	}
 	return nil
 }
@@ -79,7 +89,7 @@ var (
 )
 
 func main() {
-	pflag.ErrHelp = errors.New("")
+	pflag.ErrHelp = fmt.Errorf("")
 	pflag.Usage = func() {
 		fmt.Fprintf(os.Stderr, `USAGE %s [options]