self image

["AlessandroPPC" <aleppcrossi@libero.it>]

[-- Attachment #1: Type: text/plain, Size: 2210 bytes --]

Dear Wolfgang Denk,

I'm just looking at the SELF image and I observed that when I extract the
image and try to rebuild it
(without adding or removing any files) the dimension of result file is about
9KByte greater  than the original.
I have followed the procedure "How to increase the Size of ramdisk" to
generate an 8MByte ramdisk thus I
was expecting a small increase of the bytes amount, but never as reported.
Do you think I'm wrong somewhere?

Here enclosed is the script file.

any helps would be apreciated.
Many thanks
Alessandro.


[root@pegaso SELF]# ll
totale 1380
-rw-r--r--    1 root     root      1400262 dic 10 11:35 pRamdisk
-rwxr-xr-x    1 pegaso   pegaso       1835 dic 10 11:17 self1.sh
-rwxr-xr-x    1 pegaso   pegaso       1189 dic 10 12:01 self.sh
[root@pegaso SELF]# ./self.sh pRamdisk
entrati 21878+1 record
usciti 21878+1 record
ramdisk.gz:      66.6% -- replaced with ramdisk
entrati 8+0 record
usciti 8+0 record
mke2fs 1.27 (8-Mar-2002)
new_ramdisk is mounted; mke2fs forced anyway.  Hope /etc/mtab is incorrect.
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
2048 inodes, 8192 blocks
0 blocks (0.00%) reserved for the super user
First data block=1
1 block group
8192 blocks per group, 8192 fragments per group
2048 inodes per group

Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
tune2fs 1.27 (8-Mar-2002)
Setting maximal mount count to -1
............................................................................
............................................................................
............................................................................
............................................................................
....................................................
630 blocks
Image Name:   DexGate SELF image
Created:      Wed Dec 10 12:01:37 2003
Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
Data Size:    1408989 Bytes = 1375.97 kB = 1.34 MB
Load Address: 0x00000000
Entry Point:  0x00000000
[root@pegaso SELF]#


[-- Attachment #2: self.sh --]
[-- Type: application/octet-stream, Size: 859 bytes --]

#!/bin/bash
SOURCE=ramdisk
OLD=tmp
NEW=new
NEWRAMDISK=new_ramdisk
RESULT=/tftpboot/ramdisk.self

if [ -z "$1" ] ; then 
  echo 'usage: self.sh ramdisk_filename'
  exit 1
fi

if [ ! -e "$1" ] ; then
  echo "file $1 does not exist."
  exit 1
fi

SELFIMAGE=$1


mkdir -p $OLD
mkdir -p $NEW
    
dd if=$SELFIMAGE bs=64 skip=1 of=$SOURCE.gz
gunzip -v $SOURCE.gz

mount -o loop $SOURCE $OLD

dd if=/dev/zero of=$NEWRAMDISK bs=1024k count=8
/sbin/mke2fs -F -m0 $NEWRAMDISK
/sbin/tune2fs  -c 0 $NEWRAMDISK


mount -o loop $NEWRAMDISK $NEW
cd $OLD
find . -depth -print | cpio -VBpdum ../$NEW
cd ..
umount $OLD
    
umount $NEW
gzip -9 $NEWRAMDISK
/opt/eldk/usr/bin/mkimage -T ramdisk -C gzip -n "DexGate SELF image" -d $NEWRAMDISK.gz $RESULT

rm -rf $NEWRAMDISK.gz
rm -rf $SOURCE.gz
rm -rf $SOURCE
rmdir $NEW
rmdir $OLD