Automatically verify if commit author has assigned copyrights in the past

* contrib/commit-check: Add new script
* .gitlab-ci.yml: Add new test in the CI pipeline

.gitlab-ci.yml

@@ -41,6 +41,17 @@ variables:
   CONFIGURE_BASE_FLAGS: --enable-assert --cache-file cache/config.cache
   CFLAGS_DEFAULT: -O0 -g -ggdb3
 
+CommitCheck:
+  stage: test-from-git
+  image: $CI_REGISTRY/$BUILD_IMAGES_PROJECT:$DEBIAN_TESTING_BUILD
+  script:
+    - ./contrib/commit-check
+  allow_failure: true
+  cache:
+      paths:
+      policy: push
+
+
 # Create the tarball in a separate build directory (VPATH).
 Build-Tarball:
     stage: test-from-git

contrib/commit-check

@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+
+# Copyright (c) 2018-2022 Free Software Foundation, Inc.
+#
+# 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 <https://www.gnu.org/licenses/>.
+
+set -e
+set -u
+
+AUTHOR=$(git log -n1 --format='%aN')
+EMAIL=$(git log -n1 --format='%aE')
+DOMAIN=$(echo "$EMAIL" | cut -d'@' -f2)
+EMAIL_PARSE=$(echo "$EMAIL" | sed 's/@/ \\[at\\] /g')
+
+retval=0
+
+echo "The last commit is made by $AUTHOR: $EMAIL_PARSE"
+
+if git cat-file -p HEAD | grep "^Copyright-paperwork-exempt: Yes"; then
+	echo "This work is copyright paperwork exempt."
+elif ! grep -E -q "^\\[ASSGN\\] .* \\*($EMAIL_PARSE|$DOMAIN)\\*$" AUTHORS; then
+	if grep -E -q "^\\[ *\\] .* \\*($EMAIL_PARSE|$DOMAIN)\\*$" AUTHORS; then
+		echo "The author is known, but did not yet complete the FSF Copyright Assignment."
+	else
+		echo "The author was not found in the AUTHORS file."
+		echo "Has the author completed the FSF Copyright Assignment?"
+	fi
+	echo
+	echo "If the commit is minor, please add this to the commit message:"
+	echo "Copyright-paperwork-exempt: Yes"
+	retval=1
+else
+	echo "The author or company was found in the AUTHORS file."
+	echo "This work may be merged into master"
+fi
+
+exit $retval