chore(user/get_gpgkey_from_gitlog.sh):Add version number

[BK-2020-03.git] / user / get_gpgkey_from_gitlog.sh

#!/usr/bin/env bash
# Desc: A script that outputs a list of GPG signatures from git log output
# Usage: get_gpgkey_from_gitlog.sh [dir]
# Input: arg1: directory
# Output: stdout: newline-delimited list of 40-char GPG fingerprints
# Version: 0.0.1

declare -g buffer;

yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
check_args() {
    # Desc: Check arguments
    if [[ $# -ne 1 ]]; then die "FATAL:Incorrect number of arguments:$#"; fi;
    if [[ ! -d $1 ]]; then die "Not a directory:$1"; fi;
    return 0;
}; # check args
fill_buffer() {
    # Input: arg1: git dir
    # Output: var: $buffer: newline-delimited list of gpg fingerprints
    pushd "$1" 1>/dev/random || die "FATAL:Failed to change directory:$1";
    buffer="$(git log --show-signature 2>&1)";
    yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
    buffer="$(grep -E -- "^gpg:" < <( printf "%s" "$buffer" ) )";
    yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
    buffer="$(grep -Eo "([0-9A-F]){40}" < <( printf "%s" "$buffer" ) )";
    yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
    buffer="$(sort -u < <( printf "%s" "$buffer" ))";
    yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
    popd 1>/dev/random || die "FATAL:Failed to popd.";
}; # fill buffer with git gpg lines
main() {
    check_args "$@";
    fill_buffer "$1";
    printf "%s\n" "$buffer";
    return 0;
};

main "$@";

# git log --show-signature 2>&1 | grep -E -- "^gpg:" | grep -Eo "([0-9A-F]){40}" | sort -u