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Allow using swap as a fsType for disks #4346

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85eafdf
Allow using swap as a fstype for disks
afbjorklund Nov 14, 2025
61d0a02
Check FSType to improve disk messages
afbjorklund Nov 14, 2025
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10 changes: 5 additions & 5 deletions cmd/limactl/disk.go
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Original file line number Diff line number Diff line change
Expand Up @@ -180,7 +180,7 @@ func diskListAction(cmd *cobra.Command, args []string) error {

if jsonFormat {
for _, diskName := range disks {
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, nil)
if err != nil {
logrus.WithError(err).Errorf("disk %q does not exist?", diskName)
continue
Expand All @@ -202,7 +202,7 @@ func diskListAction(cmd *cobra.Command, args []string) error {
}

for _, diskName := range disks {
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, nil)
if err != nil {
logrus.WithError(err).Errorf("disk %q does not exist?", diskName)
continue
Expand Down Expand Up @@ -254,7 +254,7 @@ func diskDeleteAction(cmd *cobra.Command, args []string) error {
}

for _, diskName := range args {
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, nil)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
logrus.Warnf("Ignoring non-existent disk %q", diskName)
Expand Down Expand Up @@ -325,7 +325,7 @@ $ limactl disk unlock DISK1 DISK2 ...
func diskUnlockAction(cmd *cobra.Command, args []string) error {
ctx := cmd.Context()
for _, diskName := range args {
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, nil)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
logrus.Warnf("Ignoring non-existent disk %q", diskName)
Expand Down Expand Up @@ -387,7 +387,7 @@ func diskResizeAction(cmd *cobra.Command, args []string) error {
}

diskName := args[0]
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, nil)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
return fmt.Errorf("disk %q does not exists", diskName)
Expand Down
20 changes: 15 additions & 5 deletions pkg/cidata/cidata.TEMPLATE.d/boot/05-lima-disks.sh
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Expand Up @@ -25,14 +25,24 @@ for i in $(seq 0 $((LIMA_CIDATA_DISKS - 1))); do
# first time setup
if [[ ! -b "/dev/disk/by-label/lima-${DISK_NAME}" ]]; then
if $FORMAT_DISK; then
echo 'type=linux' | sfdisk --label gpt "/dev/${DEVICE_NAME}"
# shellcheck disable=SC2086
mkfs.$FORMAT_FSTYPE $FORMAT_FSARGS -L "lima-${DISK_NAME}" "/dev/${DEVICE_NAME}1"
if [ "$FORMAT_FSTYPE" == "swap" ]; then
echo 'type=swap' | sfdisk --label gpt "/dev/${DEVICE_NAME}"
# shellcheck disable=SC2086
mkswap $FORMAT_FSARGS -L "lima-${DISK_NAME}" "/dev/${DEVICE_NAME}1"
else
echo 'type=linux' | sfdisk --label gpt "/dev/${DEVICE_NAME}"
# shellcheck disable=SC2086
mkfs.$FORMAT_FSTYPE $FORMAT_FSARGS -L "lima-${DISK_NAME}" "/dev/${DEVICE_NAME}1"
fi
fi
fi

mkdir -p "/mnt/lima-${DISK_NAME}"
mount -t "$FORMAT_FSTYPE" "/dev/${DEVICE_NAME}1" "/mnt/lima-${DISK_NAME}"
if [ "$FORMAT_FSTYPE" == "swap" ]; then
swapon "/dev/${DEVICE_NAME}1"
else
mkdir -p "/mnt/lima-${DISK_NAME}"
mount -t "$FORMAT_FSTYPE" "/dev/${DEVICE_NAME}1" "/mnt/lima-${DISK_NAME}"
fi
if command -v growpart >/dev/null 2>&1 && command -v resize2fs >/dev/null 2>&1; then
growpart "/dev/${DEVICE_NAME}" 1 || true
# Only resize when filesystem is in a healthy state
Expand Down
2 changes: 1 addition & 1 deletion pkg/driver/krunkit/krunkit_darwin_arm64.go
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Expand Up @@ -54,7 +54,7 @@ func Cmdline(inst *limatype.Instance) (*exec.Cmd, error) {
ctx := context.Background()
diskUtil := proxyimgutil.NewDiskUtil(ctx)
for _, d := range inst.Config.AdditionalDisks {
disk, derr := store.InspectDisk(d.Name)
disk, derr := store.InspectDisk(d.Name, d.FSType)
if derr != nil {
return nil, fmt.Errorf("failed to load disk %q: %w", d.Name, derr)
}
Expand Down
2 changes: 1 addition & 1 deletion pkg/driver/qemu/qemu.go
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Original file line number Diff line number Diff line change
Expand Up @@ -692,7 +692,7 @@ func Cmdline(ctx context.Context, cfg Config) (exe string, args []string, err er
extraDisks := []string{}
for _, d := range y.AdditionalDisks {
diskName := d.Name
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, d.FSType)
if err != nil {
logrus.Errorf("could not load disk %q: %q", diskName, err)
return "", nil, err
Expand Down
2 changes: 1 addition & 1 deletion pkg/driver/vz/vm_darwin.go
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Expand Up @@ -499,7 +499,7 @@ func attachDisks(ctx context.Context, inst *limatype.Instance, vmConfig *vz.Virt

for _, d := range inst.Config.AdditionalDisks {
diskName := d.Name
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, d.FSType)
if err != nil {
return fmt.Errorf("failed to run load disk %q: %w", diskName, err)
}
Expand Down
2 changes: 1 addition & 1 deletion pkg/hostagent/hostagent.go
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Expand Up @@ -554,7 +554,7 @@ sudo chown -R "${USER}" /run/host-services`
a.cleanUp(func() error {
var unlockErrs []error
for _, d := range a.instConfig.AdditionalDisks {
disk, inspectErr := store.InspectDisk(d.Name)
disk, inspectErr := store.InspectDisk(d.Name, d.FSType)
if inspectErr != nil {
unlockErrs = append(unlockErrs, inspectErr)
continue
Expand Down
2 changes: 1 addition & 1 deletion pkg/instance/stop.go
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Expand Up @@ -118,7 +118,7 @@ func StopForcibly(inst *limatype.Instance) {

for _, d := range inst.AdditionalDisks {
diskName := d.Name
disk, err := store.InspectDisk(diskName)
disk, err := store.InspectDisk(diskName, d.FSType)
if err != nil {
logrus.Warnf("Disk %q does not exist", diskName)
continue
Expand Down
14 changes: 11 additions & 3 deletions pkg/store/disk.go
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Expand Up @@ -23,11 +23,15 @@ type Disk struct {
Instance string `json:"instance"`
InstanceDir string `json:"instanceDir"`
MountPoint string `json:"mountPoint"`

// if the Disk is in use and the FSType is specified
FSType *string `json:"fsType,omitempty"`
}

func InspectDisk(diskName string) (*Disk, error) {
func InspectDisk(diskName string, fsType *string) (*Disk, error) {
disk := &Disk{
Name: diskName,
Name: diskName,
FSType: fsType,
}

diskDir, err := DiskDir(diskName)
Expand Down Expand Up @@ -56,7 +60,11 @@ func InspectDisk(diskName string) (*Disk, error) {
disk.InstanceDir = instDir
}

disk.MountPoint = fmt.Sprintf("/mnt/lima-%s", diskName)
if disk.FSType != nil && *disk.FSType == "swap" {
disk.MountPoint = "swap" // only used for logging messages
} else {
disk.MountPoint = fmt.Sprintf("/mnt/lima-%s", diskName)
}

return disk, nil
}
Expand Down
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