88 lines
2.7 KiB
Bash
88 lines
2.7 KiB
Bash
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#!/bin/bash
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#
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# Author: Portisch
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# https://github.com/Portisch/idl4k
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#
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UIMAGE=idl4k.bin
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CPIONEW=rootfs-idl4k.cpio
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INITRAMFSDIR=initramfs
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KERNELDIR=../build/kernel/
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case $1 in
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extract)
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#////////////////////////////////////////////////////////////
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# Checking for uImage magic word
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# http://linux-arm.org/git?p=u-boot-armdev.git;a=blob;f=include/image.h
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#////////////////////////////////////////////////////////////
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#
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echo ">>>>> Checking for uImage magic word ( 27051956 ) :"
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MAGICWORD=`dd if=${UIMAGE} ibs=1 count=4 | hexdump -v -e '4/1 "%02X"'`
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if [ '27051956' != "$MAGICWORD" ]
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then
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echo "Not a uImage: $MAGICWORD != 27051956"
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exit 1
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else
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echo "$UIMAGE acknowledged!"
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fi
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#////////////////////////////////////////////////////////////
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# Remove header from uImage
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#////////////////////////////////////////////////////////////
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#
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echo ">>>>> Remove header from $UIMAGE"
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IMAGEOLDGZ='Image.old.gz'
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dd if=${UIMAGE} bs=1 skip=64 of=${IMAGEOLDGZ}
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#////////////////////////////////////////////////////////////
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# Extracting kernel from uImage
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#////////////////////////////////////////////////////////////
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#
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echo ">>>>> Extracting kernel from $UIMAGE"
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gunzip ${IMAGEOLDGZ}
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#////////////////////////////////////////////////////////////
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#Extracting initramfs
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# www.garykessler.net/library/file_sigs.html
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# The end of the cpio archive is recognized with an empty file named 'TRAILER!!!' = '54 52 41 49 4C 45 52 21 21 21' (hexadecimal)
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#////////////////////////////////////////////////////////////
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#
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echo ">>>>> Extracting initramfs from kernel"
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CPIOSTART=`grep -a -b -m 1 -o '0707010' Image.old | head -1 | cut -f 1 -d :`
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CPIOEND=`grep -a -b -m 1 -o -P '\x54\x52\x41\x49\x4C\x45\x52\x21\x21\x21\x00\x00\x00\x00' Image.old | head -1 | cut -f 1 -d :`
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CPIOEND=$((CPIOEND + 11 + 3))
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CPIOSIZE=$((CPIOEND - CPIOSTART))
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echo "START: ${CPIOSTART} END: ${CPIOEND} SIZE: ${CPIOSIZE}"
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OLDINITRAMFSDIR='initramfs'
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if [ "$CPIOSIZE" -le '0' ]
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then
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echo "initramfs.cpio not found"
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exit
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fi
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dd if=Image.old bs=1 skip=$CPIOSTART count=$CPIOSIZE > initramfs.old.cpio
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rm -rf $OLDINITRAMFSDIR
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mkdir -p $OLDINITRAMFSDIR
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cd $OLDINITRAMFSDIR
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cpio -v -i --no-absolute-filenames < ../initramfs.old.cpio
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cd ..
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rm -rf Image.old
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rm -rf initramfs.old.cpio
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echo ">>>>> CPIO arcive got extracted from binary"
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;;
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repack)
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#////////////////////////////////////////////////////////////
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# Create new cpio archive
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#////////////////////////////////////////////////////////////
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#
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cd ${INITRAMFSDIR}
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echo ">>>>> Create new cpio archive: $CPIONEW"
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find . "(" -path './.git' -o -name '.gitkeep' -o -name 'README.md' ")" -prune -o -print | cpio -C 1 -R root:root -H newc -o > ${KERNELDIR}${CPIONEW}
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;;
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*)
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echo "unknown command"
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esac
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