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#!/bin/bash
#
# The concept is simple
#
# 1. For a given file we split in 1MB files inside a temporary directory
#
# 2. We then create a map file, containing the resulted files and their sha512sum
#
# 3. We move the files to our $CHKDIR named after their checksums
#
# We ultimately want to be seeding the file so
#
# 4. We append the checksum of the original file with its name into the map file
#
# 5. We rename the map file after its checksum and move it to maps directory
#
# 6. We are done!
#
# Uncomment next line if you want to debug
# set -xe
PROGRAM="$(basename $0)"
if [ ! -f "$1" ]
then
echo "ERROR File not found"
exit 1
else
FILE="$1"
fi
# The directory where the chunked data will be living at
CHKDIR="$AK_WORKDIR/ftr/"
# The directory for the map files so we can reconstruct the file
FILEMAPSDIR="$AK_WORKDIR/fmp/"
# A temporary root dir to work on
TEMPORARYDIR="/tmp/tltmp"
# A subdir to split the files there
TECHDIR="/tmp/tltmp/chks/"
# A pin point to return from where we came from
CURRENTDIR="$(pwd)/"
# Our snippet for logging debug info
source $AK_LIBDIR/_ak_log
# Checking directories and create them if necessary
# TECHDIR
if [ ! -d "$TECHDIR" ]
then
mkdir -p "$TECHDIR"
if [ $? -eq 0 ]
then
_ak_log_info "Folder $TECHDIR created!"
else
_ak_log_error "Problem occured while creating $TECHDIR"
echo "ERROR Can't create $TECHDIR"
exit 1
fi
else
_ak_log_info "Temp dir found"
fi
# FILEMAPSDIR
if [ ! -d "$FILEMAPSDIR" ]
then
mkdir -p "$FILEMAPSDIR"
if [ $? -eq 0 ]
then
_ak_log_info "Folder $FILEMAPSDIR created!"
else
_ak_log_error "Problem occured while creating $FILEMAPSDIR"
echo "ERROR Can't create $FILEMAPSDIR"
exit 1
fi
else
_ak_log_info "Mapsdir found"
fi
# CHKDIR
if [ ! -d "$CHKDIR" ]
then
mkdir -p "$CHKDIR"
if [ $? -eq 0 ]
then
_ak_log_info "Folder $CHKDIR created!"
else
_ak_log_error "Problem occured while creating $CHKDIR"
echo "ERROR Can't create $CHKDIR"
exit 1
fi
else
_ak_log_info "Workdir found"
fi
# Uncomment next line in case you want to debug the resulting script as well
# echo 'set -xe' > $TEMPORARYDIR/cmd_queue.sh
# We get the SHA512 hash for the $FILE given
CHECKSUM=$(sha512sum "$FILE"|awk '{print $1}')
# We split the file into 1048576 bytes and output the chunks into TECHDIR
split -b 1048576 --additional-suffix ".chk" -d "$FILE" "$TECHDIR$(basename "$FILE")-"
# We go over there...
cd $TECHDIR
# We get every chunks' SHA512 and we craft a script to rename the chunks and
# move them to CHKDIR
sha512sum * > $TEMPORARYDIR/map; while IFS="" read -r p || [ -n "$p" ]
do
echo $p | awk '{print "mv " $2 " '$CHKDIR'" $1}' >> $TEMPORARYDIR/cmd_queue.sh
done < $TEMPORARYDIR/map
# We run the crafted script
sh $TEMPORARYDIR/cmd_queue.sh
# and we delete it
rm $TEMPORARYDIR/cmd_queue.sh
# We inform the map about the original $FILE name and SHA512
echo "$CHECKSUM $(basename "$FILE")" >> $TEMPORARYDIR/map
# We get the SHA512 hash of the resulted map file
MAPFILEHASH="$(sha512sum $TEMPORARYDIR/map | awk '{ print $1 }')"
# and we rename it with it and move it to FILEMAPSDIR
`sha512sum $TEMPORARYDIR/map | awk '{print "mv " $2 " '$FILEMAPSDIR'" $1}'`
# We remove the TEMPORARYDIR
rm -rf $TEMPORARYDIR
# and print the MAPFILEHASH
echo "$MAPFILEHASH"
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