add filename to error returned on config read

fsnotify/filewatcher.go

@@ -2,6 +2,7 @@ package fsnotify
 
 import (
 	"context"
+	"fmt"
 	"io/ioutil"
 	"log"
 	"net/url"
@@ -11,6 +12,7 @@ import (
 
 	rfsnotify "github.com/fsnotify/fsnotify"
 	"github.com/infobloxopen/hotload"
+	"github.com/pkg/errors"
 )
 
 func init() {
@@ -44,7 +46,7 @@ type pathWatch struct {
 func readConfigFile(path string) (v []byte, err error) {
 	v, err = ioutil.ReadFile(path)
 	if err != nil {
-		return
+		return nil, errors.Wrap(err, fmt.Sprintf("could not read %v", path))
 	}
 	v = []byte(strings.TrimSpace(string(v)))
 	return

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/lib/pq v1.10.8
 	github.com/onsi/ginkgo v1.16.5
 	github.com/onsi/gomega v1.27.6
+	github.com/pkg/errors v0.9.1
 	github.com/sirupsen/logrus v1.9.0
 )
 

go.sum

@@ -40,6 +40,8 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/onsi/gomega v1.27.6 h1:ENqfyGeS5AX/rlXDd/ETokDz93u0YufY1Pgxuy/PvWE=
 github.com/onsi/gomega v1.27.6/go.mod h1:PIQNjfQwkP3aQAH7lf7j87O/5FiNr+ZR8+ipb+qQlhg=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=