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Howto: Easy image mounting with CDemu and Nautilus
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haarp
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Joined: 31 Oct 2007
Posts: 353

PostPosted: Fri Jun 06, 2008 1:06 pm    Post subject: Howto: Easy image mounting with CDemu and Nautilus Reply with quote

Greetings.

Now that CDemu 1.0.0 is in Portage i decided to update my Nautilus mount script. What does it do? You Just right-click on an image, choose Scripts, disk-mount. It will load your image into an available device, your desktop's automounter does the rest. Easy. CDemu supports all kinds of images, as opposed to mount -o loop, which can only handle iso. Also, you don't need root rights to mount.
The script can also be adapted to run from the command line. Just replace occurences of zenity --error --text with echo and use the script like this: disk-mount /path/to/image

Requirements: CDemu 1.0.0 running in daemon mode, Zenity

First, emerge cdemu (unmask it first) and zenity. I recommend setting the devices to a higher value in /etc/conf.d/cdemud, else you can only mount one image at a time.
Start the daemon ( /etc/init.d/cdemud start ) and set it to start automatically at bootup ( rc-update add cdemud default )
Make a script in /home/*user*/.gnome2/nautilus-scripts and call it disk-mount or something. Paste this into the file and make it executable:
Code:
#!/bin/bash

# CD image mounter for CDemu 1.0.0
# v0.2 by haarp
# Todo: Make it possible to parse more than one file at once ($2, $3, etc.)

# Make sure the daemon is running
if pgrep cdemud >/dev/null; then
   :
else zenity --error --text "CDemu daemon is not running, aborting."; exit 1
fi

# Make sure we have a free device and save lowest free dev in $DEV
DEV=$(cdemu -b system status | grep "N/A" | head -n1 | awk '{print $1}')
if [ ! "$DEV" ]; then
   zenity --error --text "You can not load any more images."; exit 1
fi

# Get filename extension and make it lower-case
EXT_LOW=$(tr '[:upper:]' '[:lower:]' <<< "${1##*.}")

SUPPORT="0"

# Automatically parse supported extensions and put them in $supported
supported=(); while read line; do supported+=(${line##*:}); done < <(cdemu -b system supported-parsers)

for ELEMENT in "${supported[@]#.}"; do      # If extension is part of supported extensions...
   if [ "$ELEMENT" = "$EXT_LOW" ]; then
      SUPPORT="1"
   fi
done

if [ "$SUPPORT" = "1" ]; then
   
   # Execute CDemu, load image into $DEV and save output in $CDEMU
   CDEMU=$(cdemu -b system load $DEV "$1")

   # Test whether it really got loaded. If not, pop message box containing $CDEMU
   CDEMULINE=$(cdemu -b system status | grep "$1")
   if [ ! "$CDEMULINE" ]; then
      zenity --error --text "$CDEMU"
   fi
      
   # Note: CDemu doesn't return a proper exit value on failure, else below code would work
   #if CDEMU=$(cdemu -b system load $DEV "$1"); then
   #   :
   #else zenity --error --text "$CDEMU"
   #fi
   
else zenity --error --text "Selected file is not a supported image."; exit 1
fi


Now right-click on an image, select "Scripts" and "disk-mount". It will mount the disk if possible. In case of an error, it will give you the error message issued by cdemu. To unload the image, just "eject" the disk.

For .bin images you will need a cue-sheet. Got a script for that too. It assumes that the bin image does only contain one data track;

Code:
#!/bin/bash
# Create Cuesheet for BIN images

# Isolate the filename without the extension.
BASE=`echo "$1" | sed 's/\.[^.]*$//'`

cat << EOF > "${BASE}.cue"
FILE "$1" BINARY
  TRACK 01 MODE1/2352
    INDEX 01 00:00:00
EOF


Limitations:
- Don't select more than one file, it will only mount the first (anyone up to fix that?)
- Currently, this script is set to work with daemon-mode cdemud. I haven't tested the user-mode cdemud, but the script needs to be modified to work with it

Have Fun!


Last edited by haarp on Sat Jun 07, 2008 9:06 pm; edited 3 times in total
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haarp
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PostPosted: Sat Jun 07, 2008 4:06 pm    Post subject: Reply with quote

Updated script to v0.2
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Dominique_71
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PostPosted: Sun Jul 03, 2011 10:34 am    Post subject: Reply with quote

Great howto. Thank you ! :D
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Dominique_71
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PostPosted: Sun Jul 03, 2011 11:11 am    Post subject: Reply with quote

It also look like your first script is broken. "cdemu -b system supported-parsers" have changed to "cdemu -b system enum-supported-parsers".

If I run it from nautilus on an nrg file, I get "Selected file is not a supported image." If I run
Code:
cdemu -b system load 0 "CD 1.nrg"
from the console, it work. So, it must be another issue than just the syntax of cdemu.
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