[gpfsug-discuss] immutable file in an immutable folder can be touched

[Paul Ward]

Hi Jürgen,

We noticed this behaviour when we were trying to test immutability on our newly installed solution.
We tried using touch with a date in the past to test the expiry date.
We noticed although touch changed the timestamp, it didn't change wherever the policy engine checked.

We found a work around for our testing, so I think we accepted it as a 'feature'. 
I can't find a support ticket, so I am assuming we didn't report it.


Kindest regards,
Paul

Paul Ward
TS Infrastructure Architect
Natural History Museum
T: 02079426450
E: p.ward at nhm.ac.uk


-----Original Message-----
From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org> On Behalf Of Hannappel, Juergen
Sent: 28 March 2022 13:25
To: gpfsug-discuss <gpfsug-discuss at gpfsug.org>
Subject: Re: [gpfsug-discuss] immutable file in an immutable folder can be touched

... if I try a similar action e.g on ext4 where I can use the posix way with ioctl(fd, FS_IOC_GETFLAGS, &flags) flags |= FS_IMMUTABLE_FL; ioctl(fd, FS_IOC_SETFLAGS, &flags)

the touch fails and the mtime remains unchanged....

----- Original Message -----
> From: "Juergen Hannappel" <juergen.hannappel at desy.de>
> To: "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org>
> Sent: Monday, 28 March, 2022 11:50:50
> Subject: [gpfsug-discuss] immutable file in an immutable folder can be 
> touched

> Hi,
> I have an immutable file in an immutable folder:
> 
> mmchattr -i yes mutabilityTest/file
> mmchattr -i yes mutabilityTest
> ls -la mutabilityTest
> total 18
> drwxr-xr-x 2 hannappj it 4096 Mar 28 11:45 .
> drwxr-xr-x 7 hannappj it 8192 Mar 28 11:45 ..
> -rw-r--r-- 1 hannappj it   30 Mar 28 11:45 file
> 
> mmlsattr -L mutabilityTest mutabilityTest/file | grep immu
> immutable:            yes
> immutable:            yes
> 
> 
> Now i do a touch:
> touch mutabilityTest/file
> 
> no error, and the modification time is changed:
> ls -la mutabilityTest
> total 18
> drwxr-xr-x 2 hannappj it 4096 Mar 28 11:45 .
> drwxr-xr-x 7 hannappj it 8192 Mar 28 11:45 ..
> -rw-r--r-- 1 hannappj it   30 Mar 28 11:46 file
> 
> stat mutabilityTest/file
>  File: 'mutabilityTest/file'
>  Size: 30        	Blocks: 2          IO Block: 4194304 regular file
> Device: 2eh/46d	Inode: 112989      Links: 1
> Access: (0644/-rw-r--r--)  Uid: (28851/hannappj)   Gid: ( 1000/      it)
> Access: 2022-03-28 11:46:28.454807982 +0200
> Modify: 2022-03-28 11:46:28.454807982 +0200
> Change: 2022-03-28 11:46:28.454807982 +0200
> 
> 
> Shouldn't the immutability of the file include its change time?
> 
> 
> 
> --
> Dr. Jürgen Hannappel  DESY/IT    Tel.  : +49 40 8998-4616
> 
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