user/get_gpgkey_from_gitlog.sh

   1 #!/usr/bin/env bash
   2 # Desc: A script that outputs a list of GPG signatures from git log output
   3 # Usage: get_gpgkey_from_gitlog.sh [dir]
   4 # Input: arg1: directory
   5 # Output: stdout: newline-delimited list of 40-char GPG fingerprints
   6
   7 declare -g buffer;
   8
   9 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
  10 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
  11 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
  12 check_args() {
  13     # Desc: Check arguments
  14     if [[ $# -ne 1 ]]; then die "FATAL:Incorrect number of arguments:$#"; fi;
  15     if [[ ! -d $1 ]]; then die "Not a directory:$1"; fi;
  16     return 0;
  17 }; # check args
  18 fill_buffer() {
  19     # Input: arg1: git dir
  20     # Output: var: $buffer: newline-delimited list of gpg fingerprints
  21     pushd "$1" 1>/dev/random || die "FATAL:Failed to change directory:$1";
  22     buffer="$(git log --show-signature 2>&1)";
  23     yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
  24     buffer="$(grep -E -- "^gpg:" < <( printf "%s" "$buffer" ) )";
  25     yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
  26     buffer="$(grep -Eo "([0-9A-F]){40}" < <( printf "%s" "$buffer" ) )";
  27     yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
  28     buffer="$(sort -u < <( printf "%s" "$buffer" ))";
  29     yell "DEBUG:Buffer has $(wc -l < <(printf "%s" "$buffer")) lines.";
  30     popd 1>/dev/random || die "FATAL:Failed to popd.";
  31 }; # fill buffer with git gpg lines
  32 main() {
  33     check_args "$@";
  34     fill_buffer "$1";
  35     printf "%s\n" "$buffer";
  36     return 0;
  37 };
  38
  39 main "$@";
  40
  41 # git log --show-signature 2>&1 | grep -E -- "^gpg:" | grep -Eo "([0-9A-F]){40}" | sort -u