#!/bin/bash
# Relational pipes
# Copyright © 2020 František Kučera (Frantovo.cz, GlobalCode.info)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This streamlet computes hashes of given files.
# Default algorithm is sha256.
#
# Any supported hash algorithm can be specified by e.g. --option "attribute" "sha512"
# The hash command is derived from the algorithm name by adding "sum" suffix and must be available at $PATH.
#
# Multiple algorithms can be specified (just repeat the --option).
# But single streamlet instance will run them sequentially.
# When parallell processing is needed (usually faster) then multiple scriptlet instances should be used:
# --scriptlet hash --option "sha1" --as "sha1" --scriptlet hash --option "sha256" --as "sha256"
# instead of:
# --scriptlet hash --option "sha1" --as "sha1" --option "sha256" --as "sha256"
. "$(dirname "$(realpath "$0")")/streamlet-common.sh"
processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA() {
hashTypes=()
hashCommands=()
for (( i=0; i<${#optionNames[@]}; i++)); do
if [[ "x${optionNames[$i]}" == "xattribute" ]]; then
if type "${optionValues[$i]}sum" > /dev/null; then
hashTypes+=("${optionValues[$i]}");
hashCommands+=("${optionValues[$i]}sum");
else
echo "Unsupported attribute: ${optionValues[$i]}" >&2
fi
else
echo "Unsupported option: ${optionNames[$i]}" >&2
fi
done
if [[ -z "$hashTypes" ]]; then
hashTypes=("sha256")
hashCommands=("sha256sum")
fi
for (( i=0; i<${#hashTypes[@]}; i++)); do
send OUTPUT_ATTRIBUTE_METADATA "${outputAttributeAliases[$i]-${hashTypes[$i]}}" "string"
done
send WAITING_FOR_INPUT_ATTRIBUTES
}
processMessage_WAITING_FOR_OUTPUT_ATTRIBUTES() {
for (( i=0; i<${#hashTypes[@]}; i++)); do
value=$("${hashCommands[$i]}" "$currentFile" | cut -d" " -f1) 2>/dev/null;
if [[ -z "$value" ]]; then isNull="true"; else isNull="false"; fi
send OUTPUT_ATTRIBUTE "$value" "$isNull";
done
send WAITING_FOR_INPUT_ATTRIBUTES;
}
initialize
processMessages