trim values from envrionment files (#13991)

trim values to remove any spaces, newlines
from the files while importing credentials
and other values.

cmd/common-main.go

@@ -19,6 +19,7 @@ package cmd
 
 import (
 	"bufio"
+	"bytes"
 	"context"
 	"crypto/tls"
 	"crypto/x509"
@@ -456,7 +457,8 @@ func (e envKV) String() string {
 }
 
 func parsEnvEntry(envEntry string) (envKV, error) {
-	if strings.TrimSpace(envEntry) == "" {
+	envEntry = strings.TrimSpace(envEntry)
+	if envEntry == "" {
 		// Skip all empty lines
 		return envKV{
 			Skip: true,
@@ -529,7 +531,7 @@ func readFromSecret(sp string) (string, error) {
 		}
 		return "", err
 	}
-	return string(credBuf), nil
+	return string(bytes.TrimSpace(credBuf)), nil
 }
 
 func loadEnvVarsFromFiles() {

cmd/common-main_test.go

@@ -24,6 +24,49 @@ import (
 	"testing"
 )
 
+func Test_readFromSecret(t *testing.T) {
+	testCases := []struct {
+		content       string
+		expectedErr   bool
+		expectedValue string
+	}{
+		{
+			"value\n",
+			false,
+			"value",
+		},
+		{
+			" \t\n Hello, Gophers \n\t\r\n",
+			false,
+			"Hello, Gophers",
+		},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run("", func(t *testing.T) {
+			tmpfile, err := ioutil.TempFile("", "testfile")
+			if err != nil {
+				t.Error(err)
+			}
+			tmpfile.WriteString(testCase.content)
+			tmpfile.Sync()
+			tmpfile.Close()
+
+			value, err := readFromSecret(tmpfile.Name())
+			if err != nil && !testCase.expectedErr {
+				t.Error(err)
+			}
+			if err == nil && testCase.expectedErr {
+				t.Error(errors.New("expected error, found success"))
+			}
+			if value != testCase.expectedValue {
+				t.Errorf("Expected %s, got %s", testCase.expectedValue, value)
+			}
+		})
+	}
+}
+
 func Test_minioEnvironFromFile(t *testing.T) {
 	testCases := []struct {
 		content      string