Failed to create a partition

[antmoveh]

Hi, hello

The following error was reported when I created the partition

failed to write 'change' to /sys/class/block/loop4p5/uevent: open /sys/fs/class/block/loop4p5/uevent: read-only file system

On the server

[root@192 loop0p5]# ll -l
total 0
-r--r--r-- 1 root root 4096 Apr  2 09:27 alignment_offset
-r--r--r-- 1 root root 4096 Apr  2 09:27 dev
-r--r--r-- 1 root root 4096 Apr  2 09:27 discard_alignment
drwxr-xr-x 2 root root    0 Apr  2 09:01 holders
-r--r--r-- 1 root root 4096 Apr  2 09:27 inflight
-r--r--r-- 1 root root 4096 Apr  2 09:27 partition
drwxr-xr-x 2 root root    0 Apr  2 09:01 power
-r--r--r-- 1 root root 4096 Apr  2 09:27 ro
-r--r--r-- 1 root root 4096 Apr  2 09:27 size
-r--r--r-- 1 root root 4096 Apr  2 09:27 start
-r--r--r-- 1 root root 4096 Apr  2 09:27 stat
lrwxrwxrwx 1 root root    0 Apr  2 09:01 subsystem -> ../../../../../class/block
drwxr-xr-x 2 root root    0 Apr  2 09:01 trace
-rw-r--r-- 1 root root 4096 Apr  2 09:01 uevent
[root@192 loop0p5]# cat uevent 
MAJOR=259
MINOR=4
DEVNAME=loop0p5
DEVTYPE=partition

I found the following code

func genPartChangeUEvent(d disko.Disk, pSet disko.PartitionSet) error {
	if isBlk, err := blockDeviceExists(d.Path); err != nil {
		return err
	} else if !isBlk {
		return nil
	}

	for _, p := range pSet {
		uePath := fmt.Sprintf("/sys/class/block/%s/uevent", GetPartitionKname(d.Name, p.Number))
		if err := ioutil.WriteFile(uePath, []byte("change"), 0600); err != nil && os.IsNotExist(err) {
			return fmt.Errorf("%s did not exist: %v", uePath, err)
		} else if err != nil {
			return fmt.Errorf("failed to write 'change' to %s: %v", uePath, err)
		}
	}

	return nil
}

I wonder, why do I need to write this file

[smoser]

Huh. sorry for the very slow reply.
In order to make the system aware of the new partition, we create a change uevent to tell udev to re-read name/id/guid on a partition type. 24cae51

its strange that that would be read-only though. i guess you're in a container?

(i realize this is 2 years old and you're probably long moved on. sorry).