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#!/bin/bash
source ./assert.sh
PROGRAM_EXEC="$1"
function files_are_the_same()
{
[ -z "$(diff "$1" "$2")" ]
}
rm -f input backedup_input base out
# Create a four-sector base file (the original file)
dd if=/dev/zero of=base bs=512 count=4 1>/dev/null 2>&1
# Change the orignal file to make it an input file for differential backup
# There will be four different sectors in the input file
cp base input
# The first sector will have the 0th byte chaged
printf '\xFF' | dd of=input bs=1 count=1 seek=0 conv=notrunc 1>/dev/null 2>&1
# The second sector will have no changes
# The third sector will have the last byte changed
printf '\xFF' | dd of=input bs=1 count=1 seek=$(( (512 * 3) - 1 )) conv=notrunc 1>/dev/null 2>&1
# The fourth sector will have the middle byte changed
printf '\xFF' | dd of=input bs=1 count=1 seek=$(( (512 * 4) - (512 / 2) )) conv=notrunc 1>/dev/null 2>&1
assert "" "" 0 $PROGRAM_EXEC backup -s 512 input base out
if ! files_are_the_same out 400-expected_backup_output.bin; then
echo "assert: Backup output file differs from the expected one"
exit 1
fi
# Modify the file to backup (the input file used in the backup phase)
cp input backedup_input
cp base input
if ! files_are_the_same base input; then
echo "assert: The input file must be the same as the base one before restoring it"
exit 1
fi
assert "" "" 0 $PROGRAM_EXEC restore -s 512 out input
if ! files_are_the_same input backedup_input; then
echo "assert: Cannot restore the backup"
exit 1
fi
rm -f input backedup_input base out
exit 0
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