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#!/usr/bin/env bash
set -euo pipefail
# @describe Generate or verify SHA512 checksums
# @meta version 1.0.0
# @meta require-tools sha512sum
# @meta combine-shorts
#
# @flag -s --single-file Use single hash file (default: $HASHIT_SINGLE_FILE_NAME)
# @flag -c --check Verify checksums
# @flag -f --force Overwrite existing hash files
#
# @arg files+ Files to hash or verify
#
# @env HASHIT_SINGLE_FILE_NAME=SHA512SUMS Hash file name for single-file mode
check_file_and_fail() {
if [ -f "$1" ] && [ -z "${argc_force:-}" ]; then
echo "error: file '$1' exists; use -f to force overwrite" >&2
exit 1
fi
}
main() {
if [ -n "${argc_single_file:-}" ]; then
if [ -n "${argc_check:-}" ]; then
sha512sum -c "$HASHIT_SINGLE_FILE_NAME"
else
check_file_and_fail "$HASHIT_SINGLE_FILE_NAME"
sha512sum "${argc_files[@]?}" >"$HASHIT_SINGLE_FILE_NAME"
fi
else
local hash_file
if [ -n "${argc_check:-}" ]; then
for file in "${argc_files[@]?}"; do
if [[ "$file" == *.sha512 ]]; then
hash_file="$file"
else
hash_file="${file}.sha512"
fi
sha512sum -c "$hash_file"
done
else
for file in "${argc_files[@]?}"; do
hash_file="${file}.sha512"
check_file_and_fail "$hash_file"
echo "$(sha512sum "$file" | cut -d ' ' -f 1) $(basename "$file")" >"$hash_file"
done
fi
fi
}
eval "$(argc --argc-eval "$0" "$@")"
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