How to extract iso file with bash shell script

Hi,
Few days ago, I faced a problem, I needed to extract an iso file but did't have the appropriate permission for "looping" it :

mkdir -p /mnt/disk
mount -o loop disk1.iso /mnt/disk

So , I had to write a shell script which extract the iso file to a destination directory.
(There might be an easiest way to do this, But this was my way)

Please let me introduce you the "isoinfo" command.
I will use only two options of it:
isoinfo -R -l : List all the iso files in hierarchic way , For example:

#> isoinfo -R -l -i RHEL4-U4-i386-ES-disc5.iso
Will reproduce:
....
Directory listing of /RedHat/
drwxrwxr-x   3    0    0            2048 Aug  3 2006 [     29 02]  .
drwxrwxr-x   3    0    0            2048 Aug  3 2006 [     28 02]  ..
drwxrwxr-x   2    0    0           20480 Aug  3 2006 [     30 02]  RPMS
-r--r--r--   1    0    0             216 Aug  3 2006 [     65 00]  TRANS.TBL

Directory listing of /RedHat/RPMS/
drwxrwxr-x   2    0    0           20480 Aug  3 2006 [     30 02]  .
drwxrwxr-x   3    0    0            2048 Aug  3 2006 [     29 02]  ..
-r--r--r--   1    0    0           25312 Aug  3 2006 [     66 00]  TRANS.TBL
-rw-r--r--  63    0    0         2423867 Jul 28 2006 [     79 00]  evolution-devel-2.0.2-27.rhel4.6.i386.rpm
-rw-r--r-- 193    0    0           27768 Jun  7 2005 [   1263 00]  gedit-devel-2.8.1-4.i386.rpm
-rw-r--r-- 196    0    0        24491673 Jan  5 2005 [   1277 00]  gimp-print-cups-4.2.7-2.i386.rpm
-rw-r--r-- 197    0    0          565998 Jan  5 2005 [  13236 00]  gimp-print-devel-4.2.7-2.i386.rpm
-rw-r--r-- 196    0    0           12706 Jan  5 2005 [  13513 00]  gnome-python2-applet-2.6.0-3.i386.rpm
-rw-r--r-- 196    0    0           23924 Jan  5 2005 [  13520 00]  gnome-python2-gconf-2.6.0-3.i386.rpm
.....

And to extract a specific file from the iso:
isoinfo -R -i  -x 

Now, Lets go to the script:

First, the interpreter :
#!/bin/bash  

# Now, Some global defines
ISO_FILE="disk1.iso"
ISO_INFO="isoinfo"
OUT_DIR="./kickstart"
TMP_FILES="./files.tmp"
DIR_PREFIX="Directory listing of "

# Save all the files tree in tmp log file
${ISO_INFO} -R -l -i ${ISO_FILE} > ${TMP_FILES}

# If the output dir already exist, remove it
if [ -e ${OUT_DIR} ]
then
 \rm -rf ${OUT_DIR}
fi

# Read the file tree line by line
exec< ${TMP_FILES} 
while read node
do
       # If line not empty
 if [ -n "$node" ]
 then
  # If line starts with "Directory listing of", Its a directory, see output sample above
     if [[ $node == "${DIR_PREFIX}"* ]]
  then
   # Remove the "Directory listing of " prefix
   dir=`echo $node | sed s/"${DIR_PREFIX}"//g`
   # And create the directory under the OUT_DIR directory
   # mkdir -p  = make parent directories as needed (from the man page)
   mkdir -p ${OUT_DIR}/$dir
  else
   # As you can see in the output sample above, both files and directories are listed together,
   # the directories can be identified by the first letter in its attribute columns "d", So I will ignore 
   # them since we handled directories in the previous case
   if [[ $node != "d"* ]]
   then
    # File
    file=`echo $node | cut -d" " -f12`
    # Actually, I don't need to recheck again the "." and ".." directory, But, Just in case
    if [ $file != "." -a $file != ".." ]
    then
     # Create full file path 
     filepath=$dir$file
     # Create the file
     touch ${OUT_DIR}/${filepath}
     # Extract the file to its location
     ${ISO_INFO} -R -i ${ISO_FILE} -x ${filepath} > ${OUT_DIR}/${filepath}
    fi
   fi
    fi
 fi
done

# If exist, remove the temporary files list
if [ -f ${TMP_FILES} ]
then
 \rm -rf ${TMP_FILES}
fi

Well, There are much more things to add for this script (for example : status checking here and there), But the main functionality is here.

Ofer.