enit: switch away from using udev for fstab device prefixes

src/enit/blockdev.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+	"os/exec"
+	"strings"
+)
+
+type BlockDevice struct {
+	Device    string
+	UUID      string
+	PartUUID  string
+	Label     string
+	PartLabel string
+	Type      string
+}
+
+func GetBlockDevices() []BlockDevice {
+	cmd := exec.Command("/sbin/blkid")
+	out, err := cmd.Output()
+	if err != nil {
+		return make([]BlockDevice, 0)
+	}
+
+	blockDevices := make([]BlockDevice, 0)
+
+	for _, line := range strings.Split(string(out), "\n") {
+		line := strings.TrimSpace(line)
+		if len(line) == 0 {
+			continue
+		}
+		lineSplit := strings.SplitN(line, ": ", 2)
+		if len(lineSplit) != 2 {
+			return make([]BlockDevice, 0)
+		}
+		device := lineSplit[0]
+		line = lineSplit[1]
+
+		fields := []string{}
+		sb := &strings.Builder{}
+		quoted := false
+		for _, r := range line {
+			if r == '"' {
+				quoted = !quoted
+			} else if !quoted && r == ' ' {
+				fields = append(fields, sb.String())
+				sb.Reset()
+			} else {
+				sb.WriteRune(r)
+			}
+		}
+		if sb.Len() > 0 {
+			fields = append(fields, sb.String())
+		}
+
+		bd := BlockDevice{Device: device}
+
+		for _, field := range fields {
+			fieldSplit := strings.SplitN(field, "=", 2)
+			if len(fieldSplit) != 2 {
+				return make([]BlockDevice, 0)
+			}
+			fieldName := fieldSplit[0]
+			fieldValue := fieldSplit[1]
+
+			switch fieldName {
+			case "UUID":
+				bd.UUID = fieldValue
+			case "PARTUUID":
+				bd.PartUUID = fieldValue
+			case "LABEL":
+				bd.Label = fieldValue
+			case "PARTLABEL":
+				bd.PartLabel = fieldValue
+			case "TYPE":
+				bd.Type = fieldValue
+			}
+		}
+
+		blockDevices = append(blockDevices, bd)
+	}
+
+	return blockDevices
+}

src/enit/mount.go

@@ -158,23 +158,77 @@ func mountFstabEntries() (error, int) {
 		fstype := fields[2]
 		options := fields[3]
 
-		// Replace device prefixes
-		if cutSource, ok := strings.CutPrefix(source, "LABEL="); ok {
-			source = "/dev/disk/by-label/" + strings.ReplaceAll(cutSource, " ", "\\x20")
-		} else if cutSource, ok := strings.CutPrefix(source, "UUID="); ok {
-			source = "/dev/disk/by-uuid/" + cutSource
-		} else if cutSource, ok := strings.CutPrefix(source, "PARTLABEL="); ok {
-			source = "/dev/disk/by-partlabel/" + cutSource
-		} else if cutSource, ok := strings.CutPrefix(source, "PARTUUID="); ok {
-			source = "/dev/disk/by-partuuid/" + cutSource
-		}
-
+		// Convert mount options
 		flags, data, extra := convertMountOptions(options)
 
+		// Skip if noauto flag is set
 		if slices.Contains(extra, "noauto") {
 			continue
 		}
 
+		// Get block devices
+		blockDevices := GetBlockDevices()
+
+		// Replace device prefixes
+		if strings.Contains(source, "=") {
+			fieldSplit := strings.SplitN(source, "=", 2)
+			if len(fieldSplit) != 2 {
+				if slices.Contains(extra, "nofail") {
+					fmt.Printf("Warning: could not mount fstab entry on line %d: Formatting error\n", i+1)
+					continue
+				} else {
+					return fmt.Errorf("Formatting error"), i + 1
+				}
+			}
+
+			fieldName := fieldSplit[0]
+			fieldValue := fieldSplit[1]
+
+			// Reset source field
+			source = ""
+
+			for _, bd := range blockDevices {
+				bdField := ""
+
+				switch fieldName {
+				case "LABEL":
+					bdField = bd.Label
+				case "UUID":
+					bdField = bd.UUID
+				case "PARTLABEL":
+					bdField = bd.PartLabel
+				case "PARTUUID":
+					bdField = bd.PartUUID
+				default:
+					if slices.Contains(extra, "nofail") {
+						fmt.Printf("Warning: could not mount fstab entry on line %d: Formatting error\n", i+1)
+						continue
+					} else {
+						return fmt.Errorf("Formatting error"), i + 1
+					}
+				}
+
+				if bdField == "" {
+					continue
+				}
+
+				if bdField == fieldValue {
+					source = bd.Device
+					break
+				}
+			}
+
+			// Ensure source was set
+			if source == "" {
+				if slices.Contains(extra, "nofail") {
+					fmt.Printf("Warning: could not mount fstab entry on line %d: could not resolve %s=\"%s\"\n", i+1, fieldName, fieldValue)
+					continue
+				} else {
+					return fmt.Errorf("could not resolve %s=\"%s\"", fieldName, fieldValue), i + 1
+				}
+			}
+		}
+
 		if fstype == "swap" {
 			b := append([]byte(source), 0)
 			const SwapFlagPrioShift = 0