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add support for raw file as rootdisk
In addition to regular block devices raw files can now be used as rootdisk. Simple example: fallocate -l 1G disk.raw mkfs.ext4 disk.raw docker run --runtime runq --volume $PWD/disk.raw:/dev/runq/01/none/ext4 -e RUNQ_ROOTDISK=01 -ti alpine sh Signed-off-by: Peter Morjan <peter.morjan@de.ibm.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package loopback | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
|
|
||
| "github.com/gotoz/runq/pkg/util" | ||
| "golang.org/x/sys/unix" | ||
| ) | ||
|
|
||
| // Loopback defines a loopback device | ||
| type Loopback struct { | ||
| Name string | ||
| device *os.File | ||
| } | ||
|
|
||
| // New finds the first unused loopback device | ||
| func New() (*Loopback, error) { | ||
| f, err := os.OpenFile("/dev/loop-control", os.O_RDWR, 0600) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer f.Close() | ||
|
|
||
| nr, _, e1 := unix.Syscall(unix.SYS_IOCTL, f.Fd(), unix.LOOP_CTL_GET_FREE, 0) | ||
| if e1 != 0 { | ||
| return nil, fmt.Errorf("Get next free loop device file: %v", e1.Error()) | ||
| } | ||
| name := fmt.Sprintf("/dev/loop%d", nr) | ||
|
|
||
| if _, err := os.Stat(name); err != nil { | ||
| if err := util.Mknod(name, "b", 0600, 7, int(nr)); err != nil { | ||
| return nil, fmt.Errorf("create %q failed: %v", name, err) | ||
| } | ||
| } | ||
|
|
||
| return &Loopback{ | ||
| Name: name, | ||
| }, nil | ||
| } | ||
|
|
||
| // Attach attaches a given raw file to an loop back device | ||
| func (l *Loopback) Attach(file *os.File) error { | ||
| f, err := os.OpenFile(l.Name, os.O_RDWR, 0600) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| l.device = f | ||
| if _, _, e1 := unix.Syscall(unix.SYS_IOCTL, f.Fd(), unix.LOOP_SET_FD, file.Fd()); e1 != 0 { | ||
| return fmt.Errorf("Attach file to %q failed: %v", l.Name, e1.Error()) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Detach detaches the device | ||
| func (l *Loopback) Detach() error { | ||
| defer l.device.Close() | ||
| if _, _, e1 := unix.Syscall(unix.SYS_IOCTL, l.device.Fd(), unix.LOOP_CLR_FD, 0); e1 != 0 { | ||
| return fmt.Errorf("Detach file from %q failed: %v", l.Name, e1.Error()) | ||
| } | ||
| return nil | ||
| } |
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