[RFC qemu.qmp PATCH 12/24] GitLab CI: Add check-dco script

[John Snow <jsnow@redhat.com>]

Borrowed with minor modifications from qemu.git.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 .gitlab-ci.d/check-dco.py | 98 +++++++++++++++++++++++++++++++++++++++
 .gitlab-ci.d/index.yml    |  2 +
 .gitlab-ci.d/test.yml     | 15 ++++++
 3 files changed, 115 insertions(+)
 create mode 100755 .gitlab-ci.d/check-dco.py
 create mode 100644 .gitlab-ci.d/test.yml

diff --git a/.gitlab-ci.d/check-dco.py b/.gitlab-ci.d/check-dco.py
new file mode 100755
index 0000000..747cd54
--- /dev/null
+++ b/.gitlab-ci.d/check-dco.py
@@ -0,0 +1,98 @@
+#!/usr/bin/env python3
+#
+# check-dco.py: validate all commits are signed off
+#
+# Copyright (C) 2020 Red Hat, Inc.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+import argparse
+import os
+import os.path
+import sys
+import subprocess
+
+parser = argparse.ArgumentParser("check-dco")
+parser.add_argument(
+    "repourl",
+    help="upstream repo URL"
+)
+parser.add_argument(
+    "refspec",
+    help="upstream's default branch (or other refspec)"
+)
+args = parser.parse_args()
+
+
+subprocess.check_call(["git", "remote", "add", "check-dco", args.repourl])
+subprocess.check_call(["git", "fetch", "check-dco", args.refspec],
+                      stdout=subprocess.DEVNULL,
+                      stderr=subprocess.DEVNULL)
+
+ancestor = subprocess.check_output(
+    ["git", "merge-base", f"check-dco/{args.refspec}", "HEAD"],
+    universal_newlines=True)
+ancestor = ancestor.strip()
+
+subprocess.check_call(["git", "remote", "rm", "check-dco"])
+
+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)
diff --git a/.gitlab-ci.d/index.yml b/.gitlab-ci.d/index.yml
index cf61dec..cd6a65e 100644
--- a/.gitlab-ci.d/index.yml
+++ b/.gitlab-ci.d/index.yml
@@ -4,7 +4,9 @@
 stages:
   - containers
   - build
+  - test
 
 include:
   - local: '/.gitlab-ci.d/containers.yml'
   - local: '/.gitlab-ci.d/build.yml'
+  - local: '/.gitlab-ci.d/test.yml'
diff --git a/.gitlab-ci.d/test.yml b/.gitlab-ci.d/test.yml
new file mode 100644
index 0000000..35fa105
--- /dev/null
+++ b/.gitlab-ci.d/test.yml
@@ -0,0 +1,15 @@
+check-dco:
+  stage: test
+  image: $CI_REGISTRY_IMAGE/python:latest
+  needs:
+    job: python-container
+  script:
+    - .gitlab-ci.d/check-dco.py
+      "https://gitlab.com/jsnow/qemu.qmp.git"
+      "main"
+  variables:
+    GIT_DEPTH: 1000
+  rules:
+    - if: '$CI_PROJECT_NAMESPACE == "jsnow" && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
+      when: never
+    - when: on_success
-- 
2.31.1