gitlab: introduce minimal CI job for checking DCO signoff

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

2 files changed, 116 insertions, 0 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..5b30410
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,17 @@
+stages:
+  - prebuild
+
+# Check that all commits are signed-off for the DCO. Skip
+# on master branch and -maint branches, since we only need
+# to test developer's personal branches.
+dco:
+  stage: prebuild
+  # XXX change to a virt-viewer specific image later
+  image: quay.io/libvirt/buildenv-libvirt-fedora-31:latest
+  script:
+    - ./scripts/require-dco.py
+  only:
+    - branches
+  except:
+    - /^v.*-maint$/
+    - master
diff --git a/scripts/require-dco.py b/scripts/require-dco.py
new file mode 100755
index 0000000..7e6b51d
--- /dev/null
+++ b/scripts/require-dco.py
@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+
+# require-dco.py: validate all commits are signed off
+#
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+import os
+import os.path
+import sys
+import subprocess
+
+cwd = os.getcwd()
+reponame = os.path.basename(cwd)
+repourl = "https://gitlab.com/virt-viewer/%s.git" % reponame
+
+subprocess.check_call(["git", "remote", "add", "dcocheck", repourl])
+subprocess.check_call(["git", "fetch", "dcocheck", "master"],
+                      stdout=subprocess.DEVNULL,
+                      stderr=subprocess.DEVNULL)
+
+ancestor = subprocess.check_output(["git", "merge-base", "dcocheck/master", "HEAD"],
+                                   universal_newlines=True)
+
+ancestor = ancestor.strip()
+
+subprocess.check_call(["git", "remote", "rm", "dcocheck"])
+
+errors = False
+
+print("\nChecking for 'Signed-off-by: NAME <EMAIL>' on all commits since %s...\n" % ancestor)
+
+log = subprocess.check_output(["git", "log", "--format=%H %s", ancestor + "..."],
+                              universal_newlines=True)
+
+if log == "":
+    commits = []
+else:
+    commits = [[c[0:40], c[41:]] for c in log.strip().split("\n")]
+
+for sha, subject in commits:
+
+    msg = subprocess.check_output(["git", "show", "-s", sha],
+                                  universal_newlines=True)
+    lines = msg.strip().split("\n")
+
+    print("🔍 %s %s" % (sha, subject))
+    sob = False
+    for line in lines:
+        if "Signed-off-by:" in line:
+            sob = True
+            if "localhost" in line:
+                print("    ❌ FAIL: bad email in %s" % line)
+                errors = True
+
+    if not sob:
+        print("    ❌ FAIL missing Signed-off-by tag")
+        errors = True
+
+if errors:
+    print("""
+
+❌ ERROR: One or more commits are missing a valid Signed-off-By tag.
+
+
+This project requires all contributors to assert that their contributions
+are provided in compliance with the terms of the Developer's Certificate
+of Origin 1.1 (DCO):
+
+  https://developercertificate.org/
+
+To indicate acceptance of the DCO every commit must have a tag
+
+  Signed-off-by: REAL NAME <EMAIL>
+
+This can be achieved by passing the "-s" flag to the "git commit" command.
+
+To bulk update all commits on current branch "git rebase" can be used:
+
+  git rebase -i master -x 'git commit --amend --no-edit -s'
+
+""")
+
+    sys.exit(1)
+
+sys.exit(0)