Operation not supported with setfacl?

Question

This is a follow up question to this Q/A.

I tried the command on my laptop it worked:

setfacl -m 'u:programX:rwx' /etc/NetworkManager

I checked that my embedded device had acl installed and marked correct.

But I'm finding when using the command on the embedded device I get setfacl: /etc/NetworkManager: Operation not supported.

When I check man setfacl my version of acl seems to support the -m flag.

Why wouldn't acl on the device support the operation, when it works fine on my laptop?

Result of mount | grep -w /:

/dev/block/mtd/by-name/linuxroot on / type ext4 (rw,relatime,barrier=1,data=ordered)

What is the output of tune2fs -l /dev/sdaX | grep "Default mount options" replace sdaX with your device. — GAD3R, Nov 3, 2017 at 20:57
@GAD3R it returns tune2fs: No such file or directory while trying to open /dev/sdaX Couldn't find valid filesystem superblock — Philip Kirkbride, Nov 3, 2017 at 21:07
This article could help someone with more information linuxsysadmins.com/setfacl-operation-not-supported-in-linux — Babin Lonston, Jan 3, 2020 at 22:20

Hauke Laging · Accepted Answer · 2017-11-03 21:11:20Z

14

The ext4 code in older kernels (I do not know until when) needs acl as mount option. So you may try:

mount -o remount,acl /

/etc/fstab

Your fstab contains a line like

/dev/sda3   /  ext4    defaults    0 0

You have to add acl to the options field:

/dev/sda3   /  ext4    defaults,acl    0 0

answered Nov 3, 2017 at 20:42

Hauke Laging

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I ran remout but still same result
– Philip Kirkbride
Nov 3, 2017 at 20:48
2

@PhilipKirkbride Does mount | grep -w / now show acl? Can you add acl to the fstab entry and reboot?
– Hauke Laging
Nov 3, 2017 at 20:53
It doesn't show acl I will update fstab.
– Philip Kirkbride
Nov 3, 2017 at 20:55
Can you leave short note on updating fstab I haven't done that before.
– Philip Kirkbride
Nov 3, 2017 at 20:56
1

@PhilipKirkbride See the edit
– Hauke Laging
Nov 3, 2017 at 21:11

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