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linux/.config/bash/module/checksum.sh

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Bash

# Save file checksums.
checksum_create()
{
local file=".checksum"
# Error if checksum already exists.
if [[ -f "${file}" ]]; then
echo -e "${color_bred}Checksum already exists.${color_default}"
return 1
fi
find -type f | parallel -j $(_core_count) -- sha1sum {} >> "${file}"
sed -i "/${file}/d" ${file}
}
# Check stored values against actual files.
checksum_check()
{
local file=".checksum"
local failed=0
cat "${file}" | parallel -j $(_core_count) -- _checksum_check {} || ((failed++))
if [[ ${failed} = 0 ]]; then
echo -e "${color_green}All successful.${color_default}"
return 0
else
# echo -e "${color_bred}Items failed to validate: ${failed}.${color_default}"
return 1
fi
}
# Check old values and create new one if all was fine.
checksum_update()
{
local file=".checksum"
if [[ ! -f "${file}" ]]; then
echo -e "${color_bred}Checksum doesn't exists.${color_default}"
return 1
fi
checksum_check && rm "${file}" && checksum_create
}
_checksum_check()
{
local file="${1##*\ \ }"
local stored="${1%%\ \ *}"
local failed=0
# Skip if no file.
[[ -f "${file}" ]] || return 0
# Check file hash.
local actual=$(sha1sum "${file}")
actual="${actual%%\ \ *}"
# Compare values.
if [[ "${stored}" != "${actual}" ]]; then
echo -e "${color_bred}${file}: Failed.${color_default}"
return 1
fi
return 0
}
export -f _checksum_check