nix/home/program/bash/module/Checksum.nix

88 lines
2.1 KiB
Nix

{ ... }: {
text = ''
# Save file checksums.
# For file with a name `file` it will create a new file called `.file.sha1` with hash in it.
# All files by default.
# Usage: checksum_create [FILES]
function checksum_create() {
local IFS=$'\n'
local targets=(''${@})
[[ "''${targets}" = "" ]] && targets=($(_ls_file))
process() {
local hashfile=".''${target#./}.sha1"
# Skip if hash exists.
[[ -f "''${hashfile}" ]] && return 0
# Calculate hash.
pv ''${target} | sha1sum > ''${hashfile}
}
_iterate_targets process ''${targets[@]}
}
# Check stored values against actual files.
# All files by default.
# Usage: checksum_check [FILES]
function checksum_check() {
local IFS=$'\n'
local targets=(''${@})
[[ "''${targets}" = "" ]] && targets=($(_ls_file))
process() {
local hashfile=".''${target#./}.sha1"
# Skip if hash doesn't exist.
[[ -f "''${hashfile}" ]] || { _iterate_skip "No hash found."; return 0; }
# Calculate hash.
local stored=$(cat "''${hashfile}" | cut -d\ -f1)
local actual=$(pv "''${target}" | sha1sum | cut -d\ -f1)
if [[ "''${stored}" != "''${actual}" ]]; then
_error "Failed."
return 1
fi
}
_iterate_targets process ''${targets[@]}
}
# Calculate hashes for all files recursively and store in a file called `checksum.sha1`.
function checksum() {
find -type f | parallel -j $(_core_count) -- sha1sum {} >> checksum.sha1
}
# Create checksum for a file.
# Usage: _checksum_create <FILE>
function _checksum_create() {
local path="''${1%/*}"
local name="''${1##*/}"
sha1sum "''${path}/''${name}" > "''${path}/.''${name}.sha1"
}
# Check checksum for a file.
# Usage: _checksum_check <FILE>
function _checksum_check() {
local file="''${1##*\ \ }"
local stored="''${1%%\ \ *}"
# Skip if no file.
[[ -f "''${file}" ]] || return 0
# Check file hash.
local actual=$(sha1sum "''${file}")
actual="''${actual%%\ \ *}"
# Compare values.
if [[ "''${stored}" != "''${actual}" ]]; then
_error "''${file}: Failed."
return 1
fi
return 0
}
'';
}