Increase compatibility with alpine systems (#132)

Earthfile

@@ -73,6 +73,11 @@ build-immucore:
     RUN CGO_ENABLED=0 go build -o immucore -ldflags "${LDFLAGS}"
     SAVE ARTIFACT /work/immucore immucore AS LOCAL build/immucore-$VERSION
 
+build-immucore-image:
+    FROM +build-immucore
+    COPY +build-immucore/immucore /usr/bin/immucore
+    SAVE IMAGE immucore:latest
+
 dracut-artifacts:
     FROM $BASE_IMAGE
     WORKDIR /build

internal/utils/common.go

@@ -165,11 +165,10 @@ func GetState() string {
 			}
 			switch r.BootState {
 			case state.Active, state.Passive:
-				label = r.State.FilesystemLabel
+				label = "COS_STATE"
 			case state.Recovery:
-				label = r.Recovery.FilesystemLabel
-			}
-			if label == "" {
+				label = "COS_RECOVERY"
+			default:
 				return errors.New("could not get label")
 			}
 			return nil

internal/utils/mounts.go

@@ -64,11 +64,29 @@ func IsMounted(dev string) bool {
 // Does NOT need to be mounted
 // Needs full path so either /dev/sda1 or /dev/disk/by-{label,uuid}/{label,uuid} .
 func DiskFSType(s string) string {
+	Log.Debug().Str("device", s).Msg("Getting disk type for device")
 	out, e := CommandWithPath(fmt.Sprintf("blkid %s -s TYPE -o value", s))
 	if e != nil {
 		Log.Debug().Err(e).Msg("blkid")
 	}
 	out = strings.Trim(strings.Trim(out, " "), "\n")
+	blkidVersion, _ := CommandWithPath("blkid --help")
+	if strings.Contains(blkidVersion, "BusyBox") {
+		// BusyBox blkid returns the whole thing ¬_¬
+		splitted := strings.Fields(out)
+		if len(splitted) == 0 {
+			Log.Debug().Str("what", out).Msg("blkid output")
+			return "ext4"
+		}
+		typeFs := splitted[len(splitted)-1]
+		typeFsSplitted := strings.Split(typeFs, "=")
+		if len(typeFsSplitted) < 1 {
+			Log.Debug().Str("what", typeFs).Msg("typeFs split")
+			return "ext4"
+		}
+		finalFS := typeFsSplitted[1]
+		out = strings.TrimSpace(strings.Trim(finalFS, "\""))
+	}
 	Log.Debug().Str("what", s).Str("type", out).Msg("Partition FS type")
 	return out
 }

pkg/mount/dag_steps.go

@@ -60,7 +60,7 @@ func (s *State) MountRootDagStep(g *herd.Graph) error {
 					return nil
 				}
 				_ = internalUtils.Fsck(s.path("/run/initramfs/cos-state", s.TargetImage))
-				cmd := fmt.Sprintf("losetup --show -f %s", s.path("/run/initramfs/cos-state", s.TargetImage))
+				cmd := fmt.Sprintf("losetup -f %s", s.path("/run/initramfs/cos-state", s.TargetImage))
 				_, err := utils.SH(cmd)
 				s.LogIfError(err, "losetup")
 				// Trigger udevadm

pkg/mount/state.go

@@ -136,11 +136,14 @@ func (s *State) MountOP(what, where, t string, options []string, timeout time.Du
 			select {
 			default:
 				// check fs type just-in-time before running the OP
-				fsType := internalUtils.DiskFSType(what)
-				// If not empty and it does not match
-				if fsType != "" && t != fsType {
-					t = fsType
+				if t != "tmpfs" {
+					fsType := internalUtils.DiskFSType(what)
+					// If not empty and it does not match
+					if fsType != "" && t != fsType {
+						t = fsType
+					}
 				}
+
 				err := internalUtils.CreateIfNotExists(where)
 				if err != nil {
 					l.Err(err).Msg("Creating dir")