Re: Hacking linux-utils for swap label

[Loiseleur Michel <mloiseleur@linagora.com>]

Evgeniy Dushistov a écrit :

>On Thu, Apr 13, 2006 at 11:00:45AM +0200, Loiseleur Michel wrote:
>  
>
>>Hello everyone,
>>
>>  It's my first time in hacking something so deep in linux, so please 
>>don't be too hard on me. It concerns the code packaged in "linux-utils", 
>>I hope I have found the correct mailing list.
>>
>>
>>Here is the problem :
>>   I need a way in shell script to get back the device name from the 
>>label name, in order to restore (ie: format) it correctly in a recovery 
>>solution (mondorescue).
>>   For instance, a call to "e2label" do the job for the ext2/3 kind of 
>>partition.
>>   But for swap partition, there is _no_ way to get it back. The name 
>>didn't appear in /proc/swaps or /proc/partitions.
>>
>>Here is my current hacking:
>>   I have developped myself a small "addon" to swapon/swapoff program, 
>>named _swaplabel_, which display the list of device, uuid and name of 
>>all the partitions. It was really easy, this code is old but so damn cool !
>>
>>Here is the question :
>>   1) Is this possible to enhance linux-utils in order to do the job ?
>>   2) What's the better way to correct this :
>>       2.1) a new program as my "swaplabel" ?
>>       2.2) a new option to swapon ? (there is already a "-l" in it, 
>>but it does not display the label)
>>       2.3) a patch to the "-l" option ?
>>       2.4) a patch to add a colum "label" in /proc/partitions ?
>>       2.5) an other way I didn't think of ?
>>
>>thanks for your help,
>>kind regards,
>>
>>    
>>
>May be I don't understand something, but there is
>http://e2fsprogs.sourceforge.net/
>and it contains blkid utility and which used for handle LABEL= in
>/etc/fstab,
>in spite of name it handles many types of file systems and swap
>partitions also.
>  
>
Thanks a lot to you. It was ... hum ... not obvious. I can do the job 
with it. No needs to patch anything ! I can parse in shell script the 
output of "blkid".


kind regards,
-- 
Michel

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