easejs/tools/signchk

#!/bin/bash
#
# Lists all commits after a given commit that do not have a trusted
# signature
#
# Allows for automated detection of potential attacks or false authorship of
# commits by validating signatures against trusted public GPG keys.
#
#  Copyright (C) 2012, 2013 Free Software Foundation, Inc.
#
#  This file is part of GNU ease.js.
#
#  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, either version 3 of the License, or
#  (at your option) any later version.
#
#  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/>.
##

# default to last unsigned commit (specific to ease.js)
chkafter="${1:-1b1790029}"

# Check every commit after chkcommit (or all commits if chkcommit was not
# provided) for a trusted signature, listing invalid commits. %G? will output
# "G" if the signature is trusted. In the case of a merge commit, the merge
# commit itself need only be signed.
t=$'\t'
git log --first-parent --pretty="format:%H %aN$t%s$t%G?" "$chkafter.." \
  | grep -v "${t}G$"