linting: do not capitalize errors

mountinfo/mountinfo_bsd.go

@@ -21,7 +21,7 @@ func parseMountTable(filter FilterFunc) ([]*Info, error) {
 
 	count := int(C.getmntinfo(&rawEntries, C.MNT_WAIT))
 	if count == 0 {
-		return nil, fmt.Errorf("Failed to call getmntinfo")
+		return nil, fmt.Errorf("failed to call getmntinfo")
 	}
 
 	var entries []C.struct_statfs

mountinfo/mountinfo_linux.go

@@ -52,7 +52,7 @@ func GetMountsFromReader(r io.Reader, filter FilterFunc) ([]*Info, error) {
 		numFields := len(fields)
 		if numFields < 10 {
 			// should be at least 10 fields
-			return nil, fmt.Errorf("Parsing '%s' failed: not enough fields (%d)", text, numFields)
+			return nil, fmt.Errorf("parsing '%s' failed: not enough fields (%d)", text, numFields)
 		}
 
 		// separator field
@@ -67,23 +67,23 @@ func GetMountsFromReader(r io.Reader, filter FilterFunc) ([]*Info, error) {
 		for fields[sepIdx] != "-" {
 			sepIdx--
 			if sepIdx == 5 {
-				return nil, fmt.Errorf("Parsing '%s' failed: missing - separator", text)
+				return nil, fmt.Errorf("parsing '%s' failed: missing - separator", text)
 			}
 		}
 
 		p := &Info{}
 
 		p.Mountpoint, err = unescape(fields[4])
 		if err != nil {
-			return nil, fmt.Errorf("Parsing '%s' failed: mount point: %w", fields[4], err)
+			return nil, fmt.Errorf("parsing '%s' failed: mount point: %w", fields[4], err)
 		}
 		p.FSType, err = unescape(fields[sepIdx+1])
 		if err != nil {
-			return nil, fmt.Errorf("Parsing '%s' failed: fstype: %w", fields[sepIdx+1], err)
+			return nil, fmt.Errorf("parsing '%s' failed: fstype: %w", fields[sepIdx+1], err)
 		}
 		p.Source, err = unescape(fields[sepIdx+2])
 		if err != nil {
-			return nil, fmt.Errorf("Parsing '%s' failed: source: %w", fields[sepIdx+2], err)
+			return nil, fmt.Errorf("parsing '%s' failed: source: %w", fields[sepIdx+2], err)
 		}
 		p.VFSOptions = fields[sepIdx+3]
 
@@ -92,14 +92,14 @@ func GetMountsFromReader(r io.Reader, filter FilterFunc) ([]*Info, error) {
 		p.Parent, _ = strconv.Atoi(fields[1])
 		mm := strings.Split(fields[2], ":")
 		if len(mm) != 2 {
-			return nil, fmt.Errorf("Parsing '%s' failed: unexpected minor:major pair %s", text, mm)
+			return nil, fmt.Errorf("parsing '%s' failed: unexpected major:minor pair %s", text, mm)
 		}
 		p.Major, _ = strconv.Atoi(mm[0])
 		p.Minor, _ = strconv.Atoi(mm[1])
 
 		p.Root, err = unescape(fields[3])
 		if err != nil {
-			return nil, fmt.Errorf("Parsing '%s' failed: root: %w", fields[3], err)
+			return nil, fmt.Errorf("parsing '%s' failed: root: %w", fields[3], err)
 		}
 
 		p.Options = fields[5]

signal/signal.go

@@ -39,13 +39,13 @@ func ParseSignal(rawSignal string) (syscall.Signal, error) {
 	s, err := strconv.Atoi(rawSignal)
 	if err == nil {
 		if s == 0 {
-			return -1, fmt.Errorf("Invalid signal: %s", rawSignal)
+			return -1, fmt.Errorf("invalid signal: %s", rawSignal)
 		}
 		return syscall.Signal(s), nil
 	}
 	signal, ok := SignalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
 	if !ok {
-		return -1, fmt.Errorf("Invalid signal: %s", rawSignal)
+		return -1, fmt.Errorf("invalid signal: %s", rawSignal)
 	}
 	return signal, nil
 }

signal/signal_test.go

@@ -7,13 +7,13 @@ import (
 
 func TestParseSignal(t *testing.T) {
 	_, err := ParseSignal("0")
-	expectedErr := "Invalid signal: 0"
+	expectedErr := "invalid signal: 0"
 	if err == nil || err.Error() != expectedErr {
 		t.Errorf("expected  %q, but got %v", expectedErr, err)
 	}
 
 	_, err = ParseSignal("SIG")
-	expectedErr = "Invalid signal: SIG"
+	expectedErr = "invalid signal: SIG"
 	if err == nil || err.Error() != expectedErr {
 		t.Errorf("expected  %q, but got %v", expectedErr, err)
 	}

symlink/fs_unix_test.go

@@ -47,7 +47,7 @@ func testSymlink(tmpdir, path, expected, scope string) error {
 		return err
 	}
 	if expected != rewrite {
-		return fmt.Errorf("Expected %q got %q", expected, rewrite)
+		return fmt.Errorf("expected %q got %q", expected, rewrite)
 	}
 	return nil
 }

symlink/fs_windows.go

@@ -89,7 +89,7 @@ func walkSymlinks(path string) (string, error) {
 	var b bytes.Buffer
 	for n := 0; path != ""; n++ {
 		if n > maxIter {
-			return "", errors.New("EvalSymlinks: too many links in " + originalPath)
+			return "", errors.New("too many links in " + originalPath)
 		}
 
 		// A path beginning with `\\?\` represents the root, so automatically