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#!/bin/bash
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# Download SILO and patch it so that it can be used to create a bootable CD
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# for the Serengeti machine
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#  by Pavel Rimsky <rimskyp@seznam.cz>
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#  portions by Martin Decky <martin@decky.cz>
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#
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#  GPL'ed, copyleft
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#
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# stuff to be downloaded
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SILO_DOWNLOAD_FILE='silo-loaders-1.4.11.tar.gz'
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SILO_DOWNLOAD_URL='http://silo.auxio.org/pub/silo/old/'$SILO_DOWNLOAD_FILE
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# check whether the last command failed, if so, write an error message and exit
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check_error() {
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    if [ "$1" -ne "0" ]; then
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        echo
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        echo "Script failed: $2"
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        exit
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    fi
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}
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# temporary files are to be stored in /tmp
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# the resulting file in the current directory
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WD=`pwd`
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cd /tmp
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# download SILO from its official website
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echo ">>> Downloading SILO"
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wget $SILO_DOWNLOAD_URL
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check_error $? "Error downloading SILO."
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# unpack the downloaded file
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echo ">>> Unpacking tarball"
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tar xvzf $SILO_DOWNLOAD_FILE
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check_error $? "Error unpacking tarball."
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# CD to the unpacked directory
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echo ">>> Changing to the unpacked SILO directory"
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cd boot
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check_error $? "Changing directory failed."
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# patch it - remove bytes 512 to 512 + 32 (counted from 0), which belong to
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# the ELF header which is not recognized by the Serengeti firmware
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echo ">>> Patching SILO"
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(((xxd -p -l 512 isofs.b) && (xxd -p -s 544 isofs.b)) | xxd -r -p) \
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     > isofs.b.patched
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check_error $? "Patching SILO failed"
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mv isofs.b.patched isofs.b
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# get rid of files which are not needed for creating the bootable CD
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echo ">>> Purging SILO directory"
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for file in `ls`; do
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    if [ \( -f $file \) -a \( $file != "isofs.b" \) -a \( $file != "second.b" \) ];
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        then
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        rm -fr $file;
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    fi
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done
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check_error $? "Purging SILO directory failed"
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# create the gzipped tarball with patched SILO
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echo ">>> Creating tarball with patched SILO"
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tar cvzf silo.patched.tar.gz *.b
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check_error $? "Creating tarball with patched SILO failed"
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# and move it to the directory where the user expects it to be
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echo ">>> Moving the tarball with patched SILO to the current directory"
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mv silo.patched.tar.gz $WD
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check_error $? "Moving the tarball with patched SILO failed"
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# move back to the working directory from /tmp
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cd $WD
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