diff --git a/multibuild.py b/multibuild.py
index 909ad57..94bf1b2 100644
--- a/multibuild.py
+++ b/multibuild.py
@@ -14,18 +14,19 @@ from os import walk
 from os.path import exists, isfile, join, listdir
 import requests
 import re
+from buildbot.plugins import steps, util
 
-ty = '/change_hook/base'
+ty = "/change_hook/base"
 request_headers = {
-    'Content-Type': 'application/x-www-form-urlencoded',
-    'Accept': 'text/plain'
+    "Content-Type": "application/x-www-form-urlencoded",
+    "Accept": "text/plain",
 }
 request_data = {
-    'project': 'testproject',
-    'comments': 'testcomment',
+    "project": "testproject",
+    "comments": "testcomment",
 }
 
-dockerfile_extra_contents_focal = '''
+dockerfile_extra_contents_focal = """
 
 # Buildbot
 RUN apt-get install -yq --no-install-suggests --no-install-recommends \
@@ -38,9 +39,9 @@ USER buildbot
 
 ENTRYPOINT /entrypoint.sh "$BUILDMASTER" "$WORKERNAME" "$WORKERPASS"
 
-'''
+"""
 
-dockerfile_extra_contents_bionic = '''
+dockerfile_extra_contents_bionic = """
 
 # Buildbot
 RUN apt-get install -yq --no-install-suggests --no-install-recommends \
@@ -57,7 +58,8 @@ USER buildbot
 
 ENTRYPOINT /usr/local/bin/buildbot_entrypoint.sh "$BUILDMASTER" "$WORKERNAME" "$WORKERPASS"
 
-'''
+"""
+
 
 def list_jobs(directory=".buildbot"):
     """
@@ -65,10 +67,10 @@ def list_jobs(directory=".buildbot"):
     """
     results = []
     for _ in next(walk(directory))[1]:
-        if exists(join(directory, _, "Dockerfile")) \
-            and (exists(join(directory, _, "build.sh"))
-                 or exists(join(directory, _, "test.sh"))
-                 ):
+        if exists(join(directory, _, "Dockerfile")) and (
+            exists(join(directory, _, "build.sh"))
+            or exists(join(directory, _, "test.sh"))
+        ):
             results.append(_)
 
     return results
@@ -83,21 +85,23 @@ def find_artifacts(directory="out"):
             continue
         return join(directory, _)
 
+
 def get_dockerfile_contents(path, os_codename):
-    '''
+    """
     Read contents of a Dockerfile and add extra contents for the given os_codename
-    '''
-    with open(path, 'r') as file:
+    """
+    with open(path, "r") as file:
         contents = file.read()
         # remove any line containing CMD or ENTRYFILE keywords
-        contents = re.sub(r'(?m)^CMD.*$', '', contents)
-        contents = re.sub(r'(?m)^ENTRYFILE.*$', '', contents)
+        contents = re.sub(r"(?m)^CMD.*$", "", contents)
+        contents = re.sub(r"(?m)^ENTRYFILE.*$", "", contents)
 
     return contents + eval("dockerfile_extra_contents_" + os_codename)
 
-def trigger_child_hooks(buildbotUrl:str, os_codename:str, directory=".buildbot"):
+
+def trigger_child_hooks(buildbotUrl: str, os_codename: str, directory=".buildbot"):
     request_url = buildbotUrl + ty
-    
+
     # List all jobs in the directory
     jobs = list_jobs(directory)
 
@@ -109,16 +113,72 @@ def trigger_child_hooks(buildbotUrl:str, os_codename:str, directory=".buildbot")
             build_script_exists = True
         if exists(join(directory, job, "test.sh")):
             test_script_exists = True
-        
+
         # make a post request
-        request_data['dockerfile'] = get_dockerfile_contents(join(directory, job, "Dockerfile"), os_codename)
-        request_data['build_script_available'] = str(build_script_exists)
-        request_data['test_script_available'] = str(test_script_exists)
+        request_data["dockerfile"] = get_dockerfile_contents(
+            join(directory, job, "Dockerfile"), os_codename
+        )
+        request_data["build_script_available"] = str(build_script_exists)
+        request_data["test_script_available"] = str(test_script_exists)
         requests.post(request_url, headers=request_headers, data=request_data)
 
+
+def add_parent_step(build_factory, jobname, repository, branch):
+    """
+    Add a step to the parent build factory that will trigger the child hooks
+    """
+    build_factory.addStep(
+        steps.SetPropertyFromCommand(
+            name="Get OS codename",
+            command="grep ^VERSION_CODENAME= /etc/os-release | cut -d= -f2",
+            property="os_codename",
+        )
+    )
+
+    build_factory.addStep(
+        steps.ShellCommand(
+            name="Execute multibuild script",
+            command=[
+                "python",
+                "multibuild.py",
+                jobname,
+                repository,
+                branch,
+                "https://buildbot.bitmessage.org",
+                util.Interpolate("%(prop:os_codename)s"),
+            ],
+        )
+    )
+
+
+def add_child_build_sh_step(build_factory, job, directory=".buildbot"):
+    """
+    Add a step to the build factory
+    """
+    build_factory.addStep(
+        steps.ShellCommand(
+            name="build_" + job,
+            command=["bash", "-c", "cd " + join(directory, job) + " && ./build.sh"],
+        )
+    )
+
+
+def add_child_test_sh_step(build_factory, job, directory=".buildbot"):
+    """
+    Add a step to the build factory
+    """
+    build_factory.addStep(
+        steps.ShellCommand(
+            name="test_" + job,
+            command=["bash", "-c", "cd " + join(directory, job) + " && ./test.sh"],
+        )
+    )
+
+
 if __name__ == "__main__":
     # expect jobname, repository, branch, buildbotUrl, os_codename from command line args
     import sys
+
     if len(sys.argv) == 6:
         jobname = sys.argv[1]
         repository = sys.argv[2]
@@ -127,10 +187,12 @@ if __name__ == "__main__":
         os_codename = sys.argv[5]
 
         # add these into the request_data
-        request_data['jobname'] = jobname
-        request_data['repository'] = repository
-        request_data['branch'] = branch
+        request_data["jobname"] = jobname
+        request_data["repository"] = repository
+        request_data["branch"] = branch
 
         trigger_child_hooks(buildbotUrl, os_codename)
     else:
-        print("Usage: python3 multibuild.py <jobname> <repository> <branch> <buildbotUrl> <os_codename>")
\ No newline at end of file
+        print(
+            "Usage: python3 multibuild.py <jobname> <repository> <branch> <buildbotUrl> <os_codename>"
+        )