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diff --git a/roles/saltmaster/software/files/staging-commit-message.py b/roles/saltmaster/software/files/staging-commit-message.py
new file mode 100755
--- /dev/null
+++ b/roles/saltmaster/software/files/staging-commit-message.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+
+# -------------------------------------------------------------
+# Staging :: write a commit message for submodule update
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+# Project: Nasqueron
+# Created: 2018-10-27
+# License: Trivial work, not eligible to copyright
+#
+# Thanks to joki for the git diff-files and ls-tree hint
+# https://stackoverflow.com/a/52908906/1930997
+# -------------------------------------------------------------
+
+
+from git import Repo
+from os import path
+import re
+import subprocess
+
+
+staging_repo_path = '/opt/salt/staging'
+
+
+class SubmoduleCommit:
+
+ def __init__(self, repo_path, submodule_path):
+ self.repo_path = repo_path
+ self.submodule_path = submodule_path
+ self.repo = Repo(self.submodule_path)
+
+ def craft_commit(self):
+ lines = []
+
+ old_hash = self.get_old_hash()
+ new_hash = self.get_new_hash()
+
+ lines.append("Bump " + path.basename(self.submodule_path)
+ + " to " + new_hash[:12])
+ lines.append("")
+ lines.extend(self.get_commits_lines(old_hash, new_hash))
+
+ return "\n".join(lines)
+
+ def get_old_hash(self):
+ output = subprocess.check_output(['git', 'ls-tree',
+ '@', self.submodule_path],
+ cwd=self.repo_path,
+ encoding="utf-8")
+ matches = re.search('.*commit ([a-f0-9]*).*', output.strip())
+ return matches.group(1)
+
+ def get_new_hash(self):
+ return str(self.repo.head.commit)
+
+ @staticmethod
+ def format_commit_line(commit):
+ commit_hash = str(commit)[:12]
+ title = commit.message.split("\n")[0]
+
+ return " * {} {}".format(commit_hash, title)
+
+ def get_commits_lines(self, hash_base, hash_head):
+ commits_lines = []
+
+ for commit in self.repo.iter_commits(hash_head):
+ if str(commit) == hash_base:
+ break
+
+ line = self.format_commit_line(commit)
+ commits_lines.append(line)
+
+ return commits_lines
+
+ def has_submodule_been_updated(self):
+ process = subprocess.run(['git', 'diff-files', '--quiet',
+ self.submodule_path],
+ cwd=self.repo_path)
+ return process.returncode != 0
+
+
+def run(repo_path):
+ repo = Repo(repo_path)
+
+ submodules = [SubmoduleCommit(repo_path, submodule.name)
+ for submodule in repo.submodules]
+
+ commits = [submodule.craft_commit()
+ for submodule in submodules
+ if submodule.has_submodule_been_updated()]
+
+ print("\n\n".join(commits))
+
+
+if __name__ == "__main__":
+ run(staging_repo_path)
diff --git a/roles/saltmaster/software/init.sls b/roles/saltmaster/software/init.sls
--- a/roles/saltmaster/software/init.sls
+++ b/roles/saltmaster/software/init.sls
@@ -6,7 +6,7 @@
# License: Trivial work, not eligible to copyright
# -------------------------------------------------------------
-{% from "map.jinja" import packages_prefixes with context %}
+{% from "map.jinja" import dirs, packages_prefixes with context %}
# -------------------------------------------------------------
# Additional software
@@ -17,3 +17,10 @@
- pkgs:
# Jenkins execution module
- {{ packages_prefixes.python3 }}python-jenkins
+ # For staging-commit-message
+ - {{ packages_prefixes.python3 }}GitPython
+
+{{ dirs.bin }}/staging-commit-message:
+ file.managed:
+ - source: salt://roles/saltmaster/software/files/staging-commit-message.py
+ - mode: 755

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