[libvirt PATCH v3 11/12] gitlab: introduce a check for validate DCO sign-off

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This introduces a CI job for validating DCO sign-off in every commit
message. The CI jobs are not provided any information on what the
baseline commit for the branch was. We can't compare against the forked
repo's master branch, as there's no guarantee the user is keeping master
up2date in their fork. Thus we add the master upstream repo as a git
remote and identify the common ancestor.

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 .gitlab-ci.yml         | 14 ++++++
 scripts/require-dco.py | 96 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100755 scripts/require-dco.py

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d38672f260..965db22d62 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -208,3 +208,17 @@ potfile:
     expire_in: 30 days
     paths:
       - libvirt.pot
+
+
+# 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
+  image: quay.io/libvirt/buildenv-libvirt-fedora-31:latest
+  script:
+    - ./scripts/require-dco.py
+  only:
+    - branches
+  except:
+    - /^v.*-maint$/
diff --git a/scripts/require-dco.py b/scripts/require-dco.py
new file mode 100755
index 0000000000..3b642d6679
--- /dev/null
+++ b/scripts/require-dco.py
@@ -0,0 +1,96 @@
+#!/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/libvirt/%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)
+
+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)
-- 
2.24.1





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