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 Forum index » Off-Topic Area » Programming
How can i check if sfs is loaded?
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Fri 30 Mar 2012, 15:11    Post subject:  How can i check if sfs is loaded?  
Hi.

I do use scripts to load different sfs files on the fly - just calling sfs_load and give filename as a parameter. I now need to refine these scripts in a way to get information about if the sfs is already loaded. So i can "catch" starting of sfs_load and its unload GUI.

How can i find out, if an sfs file is already loaded, by using the filename as parameter?

I did try a suggestion by rhadon, but it didn't work. Sad
Code:
if [ "$(which LazY528-Internet.sfs)" ]; then
   echo "gefunden"
   else
   echo "nicht gefunden"
fi


This did also not work.
Code:
if [ "$(which LazY528-Internet)" ]; then
   echo "gefunden"
   else
   echo "nicht gefunden"
fi


Thanks in advance
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Fri 30 Mar 2012, 15:36    Post subject: Re: How can i check if sfs is loaded?  
Ok, i found, that i did understand rhadon's suggestion the wrong way. He wanted me to ask for a program inside the sfs - not asking for the sfs. Embarassed

This way it works:
Code:
if [ "$(which opera)" ]; then
   echo "gefunden"
   else
   echo "nicht gefunden"
fi


Anyway - is there a way to do this like i was asking for?
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SFR


Joined: 26 Oct 2011
Posts: 572
PostPosted: Fri 30 Mar 2012, 15:56    Post subject:  
Hi RSH

In /etc/rc.d/BOOTCONFIG I found a list of currently loaded .sfs files.
You might parse it in your script to get the needed info.

HTH
Greetings!
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Fri 30 Mar 2012, 16:18    Post subject:  
SFR wrote:
Hi RSH

In /etc/rc.d/BOOTCONFIG I found a list of currently loaded .sfs files.
You might parse it in your script to get the needed info.

HTH
Greetings!

Oohhh jaahhhh Embarassed

ghsfuhghwrqrevftgfgee Twisted Evil

Some days ago i did post exactly this in the german forum - must have gone lost while switching between german/english reading/writing/thinking. Embarassed

Laughing Laughing Laughing Thank you very much, SFR, for leading me back to this point of already been there but lost going knowledge... Laughing Laughing Laughing

(human brains are amazing strange OS's)
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PANZERKOPF

Joined: 16 Dec 2009
Posts: 250
Location: Earth
PostPosted: Sat 31 Mar 2012, 11:41    Post subject:  
SFR wrote:
Hi RSH
In /etc/rc.d/BOOTCONFIG I found a list of currently loaded .sfs files.

BOOTCONFIG contains list of files mounted by initrd but RSH needs a list of manually mounted files.
Seems that is impossible to recognize a name of file being mounted as loop device. Sad
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Sat 31 Mar 2012, 12:50    Post subject:  
PANZERKOPF wrote:
BOOTCONFIG contains list of files mounted by initrd but RSH needs a list of manually mounted files.
Seems that is impossible to recognize a name of file being mounted as loop device. Sad

Yes, that's right. I do need a list of manually mounted sfs files.

But it is possible to do this using /etc/rc.d/BOOTCONFIG. It has an entry called LASTUNIONRECORD that contains a list of actually mounted files. If you load sfs files manually using shinobars sfs_load on-the-fly, this list will be updated after every load/unload.

I did point this out earlier in the german forum, but in differences of German/English writing/reading/thinking i forgot that fact.

So, i just did the journey twice. Embarassed Cool Laughing

Thanks to all ... Laughing
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sunburnt


Joined: 08 Jun 2005
Posts: 4006
Location: Arizona, U.S.A.
PostPosted: Sat 31 Mar 2012, 22:08    Post subject:  
There is also the command "losetup" which will give the file name for any loop number.

If you still need a way to do this I can supply the code for it.
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Tue 03 Apr 2012, 02:10    Post subject:  
sunburnt wrote:
There is also the command "losetup" which will give the file name for any loop number.

If you still need a way to do this I can supply the code for it.

Yes, this would be nice.
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sunburnt


Joined: 08 Jun 2005
Posts: 4006
Location: Arizona, U.S.A.
PostPosted: Fri 06 Apr 2012, 00:02    Post subject:  
Sorry about the delay, I was out of town for a few days.

This function tests if a file is loop mounted. It works with full /path/file or just part of the file name.

Usage: FileLoopMnt ( file name or /path/file )
Code:
#!/bin/sh
#########   Test if file is loop mounted.

###   Usage:   FileLoopMnt ( file name or /path/file )

FileLoopMnt() { mount |grep loop* |sed 's# .*$##' |while read N
   do losetup-FULL $N |grep $1 |sed 's#^.* .##;s#.$##' ;done ;}


FileLoopMnt $1      # Test the function.

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Bruce B


Joined: 18 May 2005
Posts: 10818
Location: The Peoples Republic of California
PostPosted: Fri 06 Apr 2012, 11:31    Post subject:  
sunburnt,

I think your script is very clever.

I tested it to find a mounted file called lupu_520.sfs

The output was
/mnt/dev_save/520/lupu_520.sfs

But that path is incorrect, it should be

/initrd/mnt/dev_save/520/lupu_520.sfs

Is this what you find also?

Anyway, well done.
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Fri 06 Apr 2012, 13:13    Post subject:  
I think the difference here is the result of the different use of puppy - which means: using a save file (pupsave) or not using a save file.

I do get /mnt/sdd1/xxx.sfs, which is the right path, because i don't use any save file. If i do use a save file the path changes from /mnt/sdd1 to /mnt/home.

/mnt/home is a symbolic link to /initrd/mnt/dev_save.

This is a mean mean fact:

If you want to copy out a file of an sfs you can not use path /mnt/home on a mounted sfs file (if you want to do the copy using bash).

You have to change /mnt/home to /initrd/mnt/dev_save.
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sunburnt


Joined: 08 Jun 2005
Posts: 4006
Location: Arizona, U.S.A.
PostPosted: Fri 06 Apr 2012, 13:17    Post subject:  
Bruce B; You`re right of course.
Apparently losetup-FULL is not reliable, and neither is losetup.

Strange that a Linux command would be so horribly in error...
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seaside

Joined: 11 Apr 2007
Posts: 837
PostPosted: Fri 06 Apr 2012, 18:07    Post subject:  
To just check if a file is loop mounted, you could also -

Code:
[[ `losetup | grep $1` ]] && echo true


Cheers,
s
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Bruce B


Joined: 18 May 2005
Posts: 10818
Location: The Peoples Republic of California
PostPosted: Fri 06 Apr 2012, 18:22    Post subject:  
sunburnt, I think I think a lot more of your script than you do.

I rewrote it to correct for the missing /initrd when it should be in the output.

Also, if it is worth anything, probably not, I deleted the symlink /mnt/home a long time ago.

Code:
#filename: sunburnt
a=`mount | grep loop. | awk '{print $1}' | sort`

for i in $a ; do
losetup-FULL $i | awk '{print $1"  "$3}' | sed 's/\/mnt\/dev_save/\/initrd\/mnt\/dev_save/' 
done


# output is as below and it reflects proper path and filename for all loop devices in use.
# it is also fairly well formatted.

Code:
/dev/loop0:  (/initrd/mnt/dev_save/520/lupu_520.sfs)
/dev/loop1:  (/initrd/mnt/dev_save/520/lupusave.3fs)
/dev/loop2:  (/mnt/sda8/spotd.3fs)
/dev/loop3:  (/mnt/sda8/winehq.3fs)
/dev/loop4:  (/initrd/mnt/dev_save/520/extras.sfs)
/dev/loop5:  (/initrd/mnt/dev_save/520/lupu_devx_520.sfs)


Will you please test this script on your machine and check for consistency and accuracy?

Bruce

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sunburnt


Joined: 08 Jun 2005
Posts: 4006
Location: Arizona, U.S.A.
PostPosted: Fri 06 Apr 2012, 23:05    Post subject:  
seaside`s is the simplest, no "mount and loop" required.
Bruce; Yes your sed command fixes this circumstance, however...

I thought of using sed to patch the bad path, but then I figured
that this error was not the only problem that losetup had going.
What if /initrd is not the only thing that`s dropped from paths?
Either a command works and is good or it`s unreliable.

I put together the code from seaside and Bruce B, Very simple now:
Code:
LoopFile() { losetup |grep $1 |sed 's#^/mnt/dev_save#/initrd/mnt/dev_save#' ;}

Last edited by sunburnt on Sat 07 Apr 2012, 00:22; edited 8 times in total
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