diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 0b8a114..cc5decb 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -14,7 +14,7 @@ env:
 jobs:
   pytest:
     runs-on: ubuntu-latest
-    steps:    
+    steps:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Set up Python ${{ env.PYTHON_VERSION }}
@@ -42,11 +42,11 @@ jobs:
         run: poetry install
       - name: pip list
         run: |
-          poetry run pip list          
+          poetry run pip list
       - name: Run tests
         run: |
           poetry run python -m pytest -sxv
-  poetry-update-check:
+  pre-commit-check:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -68,29 +68,58 @@ jobs:
         with:
           path: ~/.local
           key: poetry-local-${{ runner.os }}-${{ steps.setup_python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}-${{ hashFiles('.github/workflows/*.yml') }}
-      - name: Install Poetry ${{ env.POETRY_VERSION }}
-        run: |
-          curl -sSL ${{ env.POETRY_URL }} | python - --version ${{ env.POETRY_VERSION }}
-          echo "$HOME/.local/bin" >> $GITHUB_PATH
-      - name: Install Dependencies
-        run: poetry install
-      - name: pip list
-        run: |
-          poetry run pip list                    
-      - name: Run tests
-        run: |
-          poetry run python -m pytest -sxv
-      - name: poetry update
-        run: |
-          poetry update
-      - name: check if changes
-        run: |
-            git status --porcelain
-            if ! output=$(git status --porcelain) || [ -n "$output" ]; then
-                echo "*** 'poetry update' produced changes to the repository; these changes should be checked in ***";
-                git --no-pager diff;
-                exit 1;
-            fi                       
+      # TODO: just use poetry to install pre-commit? chicken before egg situation...
+      - name: Install pre-commit
+        run: pip3 install pre-commit
+      - name: Run pre-commit
+        # skip poetry-lock because it breaks (aka changes) when run on different platforms
+        #   - the pre-commit on developer's hosts should catch if it's out of date (the goal)
+        run: SKIP=poetry-lock pre-commit run -av
+  # poetry-update-check:
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - name: Checkout
+  #       uses: actions/checkout@v3
+  #     - name: Set up Python ${{ env.PYTHON_VERSION }}
+  #       uses: actions/setup-python@v4
+  #       with:
+  #         python-version: ${{ env.PYTHON_VERSION }}
+  #       id: setup_python
+  #     # Poetry cache depends on OS, Python version and Poetry version.
+  #     - name: Cache Poetry cache
+  #       uses: actions/cache@v3
+  #       with:
+  #         path: ~/.cache/pypoetry
+  #         key: poetry-cache-${{ runner.os }}-${{ steps.setup_python.outputs.python-version }}-${{ env.POETRY_VERSION }}
+  #     # virtualenv cache should depends on OS, Python version and `poetry.lock` (and optionally workflow files).
+  #     - name: Cache Packages
+  #       uses: actions/cache@v3
+  #       with:
+  #         path: ~/.local
+  #         key: poetry-local-${{ runner.os }}-${{ steps.setup_python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}-${{ hashFiles('.github/workflows/*.yml') }}
+  #     - name: Install Poetry ${{ env.POETRY_VERSION }}
+  #       run: |
+  #         curl -sSL ${{ env.POETRY_URL }} | python - --version ${{ env.POETRY_VERSION }}
+  #         echo "$HOME/.local/bin" >> $GITHUB_PATH
+  #     - name: Install Dependencies
+  #       run: poetry install
+  #     - name: pip list
+  #       run: |
+  #         poetry run pip list
+  #     - name: Run tests
+  #       run: |
+  #         poetry run python -m pytest -sxv
+  #     - name: poetry update
+  #       run: |
+  #         poetry update
+  #     - name: check if changes
+  #       run: |
+  #           git status --porcelain
+  #           if ! output=$(git status --porcelain) || [ -n "$output" ]; then
+  #               echo "*** 'poetry update' produced changes to the repository; these changes should be checked in ***";
+  #               git --no-pager diff;
+  #               exit 1;
+  #           fi
   monopacker-validate:
     runs-on: ubuntu-latest
     steps:
@@ -100,7 +129,7 @@ jobs:
         uses: hashicorp/setup-packer@main
         id: setup
         with:
-          version: ${{ env.PACKER_VERSION }}        
+          version: ${{ env.PACKER_VERSION }}
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@v4
         with:
@@ -134,4 +163,4 @@ jobs:
                     poetry run monopacker validate "$builder_instance"
                 done
           echo ""
-          echo "ALL VALIDATED"
\ No newline at end of file
+          echo "ALL VALIDATED"
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..4e0ef8b
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,21 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+    -   id: check-yaml
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace
+-   repo: https://github.com/psf/black
+    rev: 23.11.0
+    hooks:
+    -   id: black
+-   repo: https://github.com/python-poetry/poetry
+    rev: '8dbe41e'
+    hooks:
+    -   id: poetry-check
+        args: ["--lock"]
+    -   id: poetry-lock
+-   repo: https://github.com/aerickson/poetry
+    rev: '0113a0c'
+    hooks:
+    -   id: poetry-update
diff --git a/LICENSE b/LICENSE
index c33dcc7..82b4de9 100644
--- a/LICENSE
+++ b/LICENSE
@@ -351,4 +351,3 @@ Exhibit B - “Incompatible With Secondary Licenses” Notice
       This Source Code Form is “Incompatible
       With Secondary Licenses”, as defined by
       the Mozilla Public License, v. 2.0.
-
diff --git a/README.md b/README.md
index 60d7add..e953fdb 100644
--- a/README.md
+++ b/README.md
@@ -124,4 +124,4 @@ Mostly, I just haven't tried to make this work.
 
 To run the tests for this library, run `poetry run pytest`.
 
-To update dependencies, run `poetry update`.
\ No newline at end of file
+To update dependencies, run `poetry update`.
diff --git a/bin/monopacker b/bin/monopacker
index 7b9e136..3ea572c 100755
--- a/bin/monopacker
+++ b/bin/monopacker
@@ -2,4 +2,5 @@
 
 if __name__ == "__main__":
     from monopacker.main import main
+
     main()
diff --git a/monopacker/files.py b/monopacker/files.py
index 27f76d9..d4998fb 100644
--- a/monopacker/files.py
+++ b/monopacker/files.py
@@ -3,7 +3,8 @@
 import os, sys, tarfile, tempfile
 from pathlib import Path
 
+
 def pack_files(files_dir, files_tar):
     # create a directory with `files` as the top level directory component.
     with tarfile.open(files_tar, "w") as tar:
-        tar.add(files_dir, arcname='files')
+        tar.add(files_dir, arcname="files")
diff --git a/monopacker/main.py b/monopacker/main.py
index a6bdc3e..63b2543 100644
--- a/monopacker/main.py
+++ b/monopacker/main.py
@@ -11,13 +11,15 @@
     generate_packer_template_params,
 )
 
+
 @click.group()
 def main():
     """
     Manages building worker images for Taskcluster.
     """
 
-@main.command(name='packer-template')
+
+@main.command(name="packer-template")
 @generate_packer_template_params
 def packer_template(**kwargs):
     """This tool expects a jinja2 templated packer.yaml and the name of one or more builders.
@@ -27,18 +29,20 @@ def packer_template(**kwargs):
     packer_template = generate_packer_template(**kwargs)
     print(json.dumps(packer_template, sort_keys=True, indent=4))
 
-@main.command(name='validate')
+
+@main.command(name="validate")
 @generate_packer_template_params
 @run_packer_params
 def validate(**kwargs):
     """Validate the generated template with 'packer validate'"""
     packer_template = generate_packer_template(**kwargs)
-    run_packer('validate', packer_template, **kwargs)
+    run_packer("validate", packer_template, **kwargs)
+
 
-@main.command(name='build')
+@main.command(name="build")
 @generate_packer_template_params
 @run_packer_params
 def validate(**kwargs):
     """Validate the generated template with 'packer validate'"""
     packer_template = generate_packer_template(**kwargs)
-    run_packer('build', packer_template, **kwargs)
+    run_packer("build", packer_template, **kwargs)
diff --git a/monopacker/packer.py b/monopacker/packer.py
index ada5fab..36b1f04 100644
--- a/monopacker/packer.py
+++ b/monopacker/packer.py
@@ -5,33 +5,35 @@
 import json
 import shlex
 
+
 def run_packer_params(fn):
     "Decorate a click function with options for run_packer"
     params = [
         click.option(
-            "--packer",
-            type=str,
-            help="path to the packer binary",
-            default='packer'),
+            "--packer", type=str, help="path to the packer binary", default="packer"
+        ),
         click.option(
             "--packer-args",
             type=str,
             help="additional arguments to pass to packer (shell-quoted)",
-            default='')
-        ]
+            default="",
+        ),
+    ]
     params.reverse()
     for param in params:
         fn = param(fn)
     return fn
 
+
 def run_packer(command, input, *, packer, packer_args, **_):
     """Run packer with the given (JSON) template, passing additional extra_args"""
     packer_args = shlex.split(packer_args)
     try:
         subprocess.run(
-            [packer, command] + packer_args + ['-'],
-            input=bytes(json.dumps(input), 'utf8'),
-            check=True)
+            [packer, command] + packer_args + ["-"],
+            input=bytes(json.dumps(input), "utf8"),
+            check=True,
+        )
         return True
     except subprocess.CalledProcessError as e:
         print(f"packer exited with code {e.returncode}", file=sys.stderr)
diff --git a/monopacker/secrets.py b/monopacker/secrets.py
index 5584b9d..fad700c 100755
--- a/monopacker/secrets.py
+++ b/monopacker/secrets.py
@@ -7,6 +7,7 @@
 
 yaml = YAML(typ="safe")
 
+
 def pack_secrets(secrets_file, secrets_tar):
     with open(secrets_file, "r") as f:
         secrets = yaml.load(f)
@@ -22,7 +23,7 @@ def pack_secrets(secrets_file, secrets_tar):
                     raise RuntimeError(f"Encountered secret {name} without `path` key")
                 if "value" not in secret:
                     raise RuntimeError(f"Encountered secret {name} without `value` key")
-                path = secret["path"].lstrip('/')
+                path = secret["path"].lstrip("/")
                 value = bytes(secret["value"], "utf8")
                 ti = tarfile.TarInfo(path)
                 ti.size = len(value)
diff --git a/monopacker/template_packer.py b/monopacker/template_packer.py
index 9c8d158..5244c10 100755
--- a/monopacker/template_packer.py
+++ b/monopacker/template_packer.py
@@ -20,6 +20,7 @@
 
 yaml = YAML(typ="safe")
 
+
 def get_files_from_subdirs(*args, root_dir=".", globs=["*"]):
     """Get an sorted list of files from a list of subdirectories
 
@@ -59,8 +60,8 @@ def load_yaml_from_file(filename: str):
 def merge_vars(base_vars, override_vars):
     """Takes two dicts, returns a new dict. Values in the second dict take precedence.
 
-       If both dicts have a dictionary value for a key their subdicts are
-       merged, recursively.  All other values (including lists) are overridden.
+    If both dicts have a dictionary value for a key their subdicts are
+    merged, recursively.  All other values (including lists) are overridden.
     """
     d = {**base_vars}
     for k, v in override_vars.items():
@@ -74,7 +75,7 @@ def merge_vars(base_vars, override_vars):
 
 def get_vars_from_files(files: Sequence[str]):
     """Takes a list of variable files
-       in `root_dir` of increasing precedence, returns a merged dict
+    in `root_dir` of increasing precedence, returns a merged dict
     """
     d = {}
     for file in files:
@@ -174,51 +175,56 @@ def get_builders_for_templating(
         )
     return builders
 
+
 def generate_packer_template_params(fn):
     "Decorate a click function with options for generate_packer_template"
     params = [
-        click.argument(
-            'builders',
-            nargs=-1,
-            type=str,
-            required=True),
+        click.argument("builders", nargs=-1, type=str, required=True),
         click.option(
             "--builders_dir",
             type=str,
             help="directory for builder configuration",
-            default=os.environ.get("MONOPACKER_BUILDERS_DIR", "./builders")),
+            default=os.environ.get("MONOPACKER_BUILDERS_DIR", "./builders"),
+        ),
         click.option(
             "--var_files_dir",
             type=str,
             help="directory for builder var_files",
-            default=os.environ.get("MONOPACKER_VARS_DIR", "./template/vars")),
+            default=os.environ.get("MONOPACKER_VARS_DIR", "./template/vars"),
+        ),
         click.option(
             "--templates_dir",
             type=str,
             help="directory for builder templates",
-            default=os.environ.get("MONOPACKER_TEMPLATES_DIR", "./template/builders")),
+            default=os.environ.get("MONOPACKER_TEMPLATES_DIR", "./template/builders"),
+        ),
         click.option(
             "--scripts_dir",
             type=str,
             help="directory for builder templates",
-            default=os.environ.get("MONOPACKER_SCRIPTS_DIR", "./scripts")),
+            default=os.environ.get("MONOPACKER_SCRIPTS_DIR", "./scripts"),
+        ),
         click.option(
             "--files_dir",
             type=str,
             help="directory for binary files used in packer provisioners",
-            default=os.environ.get("MONOPACKER_FILES_DIR", "./files")),
+            default=os.environ.get("MONOPACKER_FILES_DIR", "./files"),
+        ),
         click.option(
             "--secrets_file",
             type=str,
             help="file containing secrets",
-            default='./fake_secrets.yaml'),
-        ]
+            default="./fake_secrets.yaml",
+        ),
+    ]
     params.reverse()
     for param in params:
         fn = param(fn)
     return fn
 
-def generate_packer_template(*,
+
+def generate_packer_template(
+    *,
     builders,
     builders_dir,
     var_files_dir,
@@ -226,9 +232,10 @@ def generate_packer_template(*,
     scripts_dir,
     files_dir,
     secrets_file,
-    **_):
-    pack_secrets(secrets_file, 'secrets.tar')
-    pack_files(files_dir, 'files.tar')
+    **_,
+):
+    pack_secrets(secrets_file, "secrets.tar")
+    pack_files(files_dir, "files.tar")
 
     # variables namespaced per builder
     variables: Dict[str, Dict[str, Any]] = {}
@@ -261,50 +268,59 @@ def generate_packer_template(*,
 
     # include some setup for linux and windows builders
     if linux_builders:
-        pkr["provisioners"].append({
-            "type": "file",
-            "source": "./files.tar",
-            "destination": "/tmp/",
-            # TODO: only
-        })
-        pkr["provisioners"].append({
-            "type": "shell",
-            "inline": [
-                # files.tar is two levels deep (/tmp/files)
-                "sudo tar xvf /tmp/files.tar -C / --strip-components=1",
-                "rm /tmp/files.tar",
-            ],
-            # TODO: only
-        })
-        pkr["provisioners"].append({
-            'type': 'file',
-            'source': './secrets.tar',
-            'destination': '/tmp/',
-            # TODO: only
-        })
-        pkr["provisioners"].append({
-            'type': 'shell',
-            'inline': [
-                'sudo mkdir -p /etc/taskcluster/secrets',
-                'sudo tar xvf /tmp/secrets.tar -C /',
-                'sudo chown root:root -R /etc/taskcluster',
-                'sudo chmod 0400 -R /etc/taskcluster/secrets',
-                'rm /tmp/secrets.tar',
-            ],
-            'only': linux_builders,
-        })
-        pkr["provisioners"].append({
-            'type': 'shell',
-            'inline': [
-                '/usr/bin/cloud-init status --wait',
-            ],
-            'only': linux_builders,
-        })
+        pkr["provisioners"].append(
+            {
+                "type": "file",
+                "source": "./files.tar",
+                "destination": "/tmp/",
+                # TODO: only
+            }
+        )
+        pkr["provisioners"].append(
+            {
+                "type": "shell",
+                "inline": [
+                    # files.tar is two levels deep (/tmp/files)
+                    "sudo tar xvf /tmp/files.tar -C / --strip-components=1",
+                    "rm /tmp/files.tar",
+                ],
+                # TODO: only
+            }
+        )
+        pkr["provisioners"].append(
+            {
+                "type": "file",
+                "source": "./secrets.tar",
+                "destination": "/tmp/",
+                # TODO: only
+            }
+        )
+        pkr["provisioners"].append(
+            {
+                "type": "shell",
+                "inline": [
+                    "sudo mkdir -p /etc/taskcluster/secrets",
+                    "sudo tar xvf /tmp/secrets.tar -C /",
+                    "sudo chown root:root -R /etc/taskcluster",
+                    "sudo chmod 0400 -R /etc/taskcluster/secrets",
+                    "rm /tmp/secrets.tar",
+                ],
+                "only": linux_builders,
+            }
+        )
+        pkr["provisioners"].append(
+            {
+                "type": "shell",
+                "inline": [
+                    "/usr/bin/cloud-init status --wait",
+                ],
+                "only": linux_builders,
+            }
+        )
 
     e = Environment(loader=FileSystemLoader([templates_dir]))
     e.filters["clean_gcp_image_name"] = clean_gcp_image_name
     for builder in templated_builders:
-
         # for each monopacker builder, use the Jinja template to generate a Packer builder
         template_file = Path(templates_dir) / (builder["template"] + ".jinja2")
         with open(template_file) as f:
@@ -338,7 +354,9 @@ def generate_packer_template(*,
             sys.exit(1)
 
         if type(template_builders) != list:
-            print(f"Template {template_file} generated YAML that is not an array:\n{output}\n")
+            print(
+                f"Template {template_file} generated YAML that is not an array:\n{output}\n"
+            )
             print(f"Packer template variables:\n{variables}\n")
             sys.exit(1)
 
@@ -347,26 +365,40 @@ def generate_packer_template(*,
         # make a provisioner for each builder, specialized to run only on that builder,
         # with that builder's scripts and variables
         if linux_builders:
-            pkr["provisioners"].append({
-                'type': 'shell',
-                'scripts': builder["scripts"],
-                'environment_vars': builder["vars"]["env_vars"] if "env_vars" in builder["vars"] else None,
-                'execute_command': builder["vars"]["execute_command"] if "execute_command" in builder["vars"] else None,
-                'expect_disconnect': True,
-                'start_retry_timeout': builder["vars"]["ssh_timeout"] if "ssh_timeout" in builder["vars"] else None,
-                'only': [builder["vars"]["name"]] if builder["platform"] == "linux" else [],
-            })
+            pkr["provisioners"].append(
+                {
+                    "type": "shell",
+                    "scripts": builder["scripts"],
+                    "environment_vars": builder["vars"]["env_vars"]
+                    if "env_vars" in builder["vars"]
+                    else None,
+                    "execute_command": builder["vars"]["execute_command"]
+                    if "execute_command" in builder["vars"]
+                    else None,
+                    "expect_disconnect": True,
+                    "start_retry_timeout": builder["vars"]["ssh_timeout"]
+                    if "ssh_timeout" in builder["vars"]
+                    else None,
+                    "only": [builder["vars"]["name"]]
+                    if builder["platform"] == "linux"
+                    else [],
+                }
+            )
 
         if windows_builders:
-            pkr["provisioners"].append({
-                'type': 'powershell',
-                'scripts': builder["scripts"],
-                'only': [builder["vars"]["name"]] if builder["platform"] == "windows" else [],
-            })
+            pkr["provisioners"].append(
+                {
+                    "type": "powershell",
+                    "scripts": builder["scripts"],
+                    "only": [builder["vars"]["name"]]
+                    if builder["platform"] == "windows"
+                    else [],
+                }
+            )
 
     # ensure we output the expected artifacts..
-    pkr["post-processors"] =  [
-        {'type': 'manifest', 'output': 'packer-artifacts.json', 'strip_path': True},
+    pkr["post-processors"] = [
+        {"type": "manifest", "output": "packer-artifacts.json", "strip_path": True},
     ]
 
     return pkr
diff --git a/poetry.lock b/poetry.lock
index 6f691ca..6584b20 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.7.0 and should not be changed by hand.
 
 [[package]]
 name = "click"
@@ -193,24 +193,24 @@ testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pyfakefs"
-version = "5.2.4"
+version = "5.3.0"
 description = "pyfakefs implements a fake file system that mocks the Python file system modules."
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pyfakefs-5.2.4-py3-none-any.whl", hash = "sha256:8eb95f1dd1c4b8bdce30448fe169875e3a4451c32d3f9c37799157bd4eb7b789"},
-    {file = "pyfakefs-5.2.4.tar.gz", hash = "sha256:3e040f3792086086a0dc2191b05fe709438e168aafe2e94fcdbef8e3859208d8"},
+    {file = "pyfakefs-5.3.0-py3-none-any.whl", hash = "sha256:33c1f891078c727beec465e75cb314120635e2298456493cc2cc0539e2130cbb"},
+    {file = "pyfakefs-5.3.0.tar.gz", hash = "sha256:e3e35f65ce55ee8ecc5e243d55cfdbb5d0aa24938f6e04e19f0fab062f255020"},
 ]
 
 [[package]]
 name = "pytest"
-version = "7.4.2"
+version = "7.4.3"
 description = "pytest: simple powerful testing with Python"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pytest-7.4.2-py3-none-any.whl", hash = "sha256:1d881c6124e08ff0a1bb75ba3ec0bfd8b5354a01c194ddd5a0a870a48d99b002"},
-    {file = "pytest-7.4.2.tar.gz", hash = "sha256:a766259cfab564a2ad52cb1aae1b881a75c3eb7e34ca3779697c23ed47c47069"},
+    {file = "pytest-7.4.3-py3-none-any.whl", hash = "sha256:0d009c083ea859a71b76adf7c1d502e4bc170b80a8ef002da5806527b9591fac"},
+    {file = "pytest-7.4.3.tar.gz", hash = "sha256:d989d136982de4e3b29dabcc838ad581c64e8ed52c11fbe86ddebd9da0818cd5"},
 ]
 
 [package.dependencies]
@@ -245,48 +245,61 @@ jinja2 = ["ruamel.yaml.jinja2 (>=0.2)"]
 
 [[package]]
 name = "ruamel-yaml-clib"
-version = "0.2.7"
+version = "0.2.8"
 description = "C version of reader, parser and emitter for ruamel.yaml derived from libyaml"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 files = [
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 ]
 
 [[package]]
diff --git a/scripts/ubuntu-cuda/20-install-libcudnn.sh b/scripts/ubuntu-cuda/20-install-libcudnn.sh
index 10a8666..eccaaaa 100644
--- a/scripts/ubuntu-cuda/20-install-libcudnn.sh
+++ b/scripts/ubuntu-cuda/20-install-libcudnn.sh
@@ -19,7 +19,7 @@ DISTRO=ubuntu${UBUNTU_RELEASE//\./} # ubuntu1804
 cuda_version="cuda12.0"
 cudnn_version="8.8.1.*"
 
-wget https://developer.download.nvidia.com/compute/cuda/repos/${DISTRO}/x86_64/cuda-${DISTRO}.pin 
+wget https://developer.download.nvidia.com/compute/cuda/repos/${DISTRO}/x86_64/cuda-${DISTRO}.pin
 
 sudo mv cuda-${DISTRO}.pin /etc/apt/preferences.d/cuda-repository-pin-600
 sudo apt-key adv --fetch-keys https://developer.download.nvidia.com/compute/cuda/repos/${DISTRO}/x86_64/3bf863cc.pub
diff --git a/scripts/ubuntu-cuda/30-install-singularity.sh b/scripts/ubuntu-cuda/30-install-singularity.sh
index 059cd2d..53bd397 100644
--- a/scripts/ubuntu-cuda/30-install-singularity.sh
+++ b/scripts/ubuntu-cuda/30-install-singularity.sh
@@ -28,4 +28,4 @@ sudo apt-get install -y \
 cd /tmp
 wget https://github.com/sylabs/singularity/releases/download/v3.11.1/singularity-ce_3.11.1-jammy_amd64.deb
 dpkg -i singularity-ce_3.11.1-jammy_amd64.deb
-rm *.deb
\ No newline at end of file
+rm *.deb
diff --git a/scripts/ubuntu-cuda/README.md b/scripts/ubuntu-cuda/README.md
index e5e9016..679e019 100644
--- a/scripts/ubuntu-cuda/README.md
+++ b/scripts/ubuntu-cuda/README.md
@@ -3,4 +3,3 @@
 ## TODO
 
 - rename to ubuntu-translations
-
diff --git a/scripts/ubuntu-jammy/01-kernel.sh b/scripts/ubuntu-jammy/01-kernel.sh
index 164fc25..b96e243 100644
--- a/scripts/ubuntu-jammy/01-kernel.sh
+++ b/scripts/ubuntu-jammy/01-kernel.sh
@@ -18,7 +18,7 @@ export DEBIAN_FRONTEND=noninteractive
 retry apt-get update
 
 # TODO: figure out issue on jammy
-# error: 
+# error:
 #   The following packages have unmet dependencies:
 #   linux-crashdump : Depends: kdump-tools but it is not installable
 #
diff --git a/scripts/worker-runner-gw-systemd/10-create-worker-runner-config.sh b/scripts/worker-runner-gw-systemd/10-create-worker-runner-config.sh
index 248306e..26735c2 100644
--- a/scripts/worker-runner-gw-systemd/10-create-worker-runner-config.sh
+++ b/scripts/worker-runner-gw-systemd/10-create-worker-runner-config.sh
@@ -19,4 +19,4 @@ worker:
     implementation: generic-worker
     path: /home/ubuntu/generic_worker/generic-worker
     configPath: /home/ubuntu/generic_worker/generic-worker.config
-EOF
\ No newline at end of file
+EOF
diff --git a/scripts/worker-runner-gw-systemd/30-create-tc-job-dirs.sh b/scripts/worker-runner-gw-systemd/30-create-tc-job-dirs.sh
index 12daf5f..764c613 100644
--- a/scripts/worker-runner-gw-systemd/30-create-tc-job-dirs.sh
+++ b/scripts/worker-runner-gw-systemd/30-create-tc-job-dirs.sh
@@ -13,4 +13,4 @@ USER_DIR="/home/ubuntu"
 DIR_LIST="${USER_DIR}/tasks ${USER_DIR}/caches ${USER_DIR}/downloads"
 
 sudo mkdir -p ${DIR_LIST}
-sudo chown -R ubuntu:ubuntu ${DIR_LIST}
\ No newline at end of file
+sudo chown -R ubuntu:ubuntu ${DIR_LIST}
diff --git a/scripts/worker-runner-gw-systemd/README.md b/scripts/worker-runner-gw-systemd/README.md
index daf4d74..6a5a1ad 100644
--- a/scripts/worker-runner-gw-systemd/README.md
+++ b/scripts/worker-runner-gw-systemd/README.md
@@ -2,7 +2,7 @@
 
 This scripts directory configures worker-runner and generic-worker.
 
-TODO: 
+TODO:
 - move this to generic-worker-linux?
 
 ## Inputs
@@ -20,4 +20,4 @@ TODO:
 
 ## Notes
 
-none yet
\ No newline at end of file
+none yet
diff --git a/tests/test_secrets.py b/tests/test_secrets.py
index 6c45d05..4db44bf 100644
--- a/tests/test_secrets.py
+++ b/tests/test_secrets.py
@@ -3,17 +3,23 @@
 
 from monopacker.secrets import pack_secrets
 
+
 def test_pack_secrets(fs):
     # "fs" is the reference to the fake file system
-    fs.create_file('secrets.yaml', contents=json.dumps([
-        {'name': 'a-secret', 'path': '/path/to/my/secret', 'value': 'sshh'},
-        {'name': 'b-secret', 'path': '/path/to/my/stuff', 'value': 'quiet'},
-    ]))
-    pack_secrets('secrets.yaml', 'secrets.tar')
-    with tarfile.open('secrets.tar') as tar:
+    fs.create_file(
+        "secrets.yaml",
+        contents=json.dumps(
+            [
+                {"name": "a-secret", "path": "/path/to/my/secret", "value": "sshh"},
+                {"name": "b-secret", "path": "/path/to/my/stuff", "value": "quiet"},
+            ]
+        ),
+    )
+    pack_secrets("secrets.yaml", "secrets.tar")
+    with tarfile.open("secrets.tar") as tar:
         print(tar.getnames())
         # note that initial `/` is stripped
-        ti = tar.extractfile('path/to/my/secret')
-        assert ti.read() == b'sshh'
-        ti = tar.extractfile('path/to/my/stuff')
-        assert ti.read() == b'quiet'
+        ti = tar.extractfile("path/to/my/secret")
+        assert ti.read() == b"sshh"
+        ti = tar.extractfile("path/to/my/stuff")
+        assert ti.read() == b"quiet"
diff --git a/tests/test_template_packer.py b/tests/test_template_packer.py
index d484138..4570403 100644
--- a/tests/test_template_packer.py
+++ b/tests/test_template_packer.py
@@ -9,6 +9,7 @@
     generate_packer_template,
 )
 
+
 def test_merge_vars():
     base = {"abc": 123, "foo": "bar", "blah": {"sub_foo": "sub_bar", "cow": "quack"}}
     override = {"abc": 456, "blah": {"cow": "moo"}}
@@ -34,7 +35,7 @@ def test_merge_vars_overwrite_arrays():
 
 
 def test_merge_vars_merge_sub_sub_dicts():
-    base = {"combined": {"b": {1: 10, 2:20}}}
+    base = {"combined": {"b": {1: 10, 2: 20}}}
     override = {"combined": {"b": {2: 120, 3: 130}}}
     expected = {"combined": {"b": {1: 10, 2: 120, 3: 130}}}
 
@@ -68,7 +69,10 @@ def test_get_builders_for_templating(tmpdir):
 
     # tests the normal case, builder with var_files, vars
     builders = get_builders_for_templating(
-        ["foo"], builders_dir=builders_dir, var_files_dir=vars_dir, scripts_dir=scripts_dir,
+        ["foo"],
+        builders_dir=builders_dir,
+        var_files_dir=vars_dir,
+        scripts_dir=scripts_dir,
     )
 
     assert builders[0]["template"] == "foo.yaml"
@@ -94,7 +98,10 @@ def test_get_builders_for_templating(tmpdir):
     # test that we get FileNotFoundError when passing a nonexistant subdir
     with pytest.raises(FileNotFoundError, match=r".*bar.yaml.*"):
         builders = get_builders_for_templating(
-            ["bar"], builders_dir=builders_dir, var_files_dir=vars_dir, scripts_dir=scripts_dir,
+            ["bar"],
+            builders_dir=builders_dir,
+            var_files_dir=vars_dir,
+            scripts_dir=scripts_dir,
         )
 
 
@@ -139,38 +146,54 @@ def test_generate_packer_template(tmpdir):
     files_dir = tmpdir.mkdir("files")
     secrets_file = tmpdir.join("secrets.yml")
 
-    builders_dir.join("linux.yaml").write(json.dumps({
-        "template": "alibaba_linux",
-        "platform": "linux",
-        "builder_var_files": ["bv", "env"],
-        "script_directories": ["facebook-worker"],
-        "builder_vars": {
-            "execute_command": "do-it",
-            "ssh_timeout": "30m",
-        },
-    }))
-
-    builders_dir.join("winny.yaml").write(json.dumps({
-        "template": "openstack_windows",
-        "platform": "windows",
-        "builder_var_files": [],
-        "script_directories": ["win-worker"],
-        "builder_vars": {
-            "execute_command": "do-it",
-            "ssh_timeout": "30m",
-        },
-    }))
-
-    templates_dir.join("alibaba_linux.jinja2").write(textwrap.dedent("""\
+    builders_dir.join("linux.yaml").write(
+        json.dumps(
+            {
+                "template": "alibaba_linux",
+                "platform": "linux",
+                "builder_var_files": ["bv", "env"],
+                "script_directories": ["facebook-worker"],
+                "builder_vars": {
+                    "execute_command": "do-it",
+                    "ssh_timeout": "30m",
+                },
+            }
+        )
+    )
+
+    builders_dir.join("winny.yaml").write(
+        json.dumps(
+            {
+                "template": "openstack_windows",
+                "platform": "windows",
+                "builder_var_files": [],
+                "script_directories": ["win-worker"],
+                "builder_vars": {
+                    "execute_command": "do-it",
+                    "ssh_timeout": "30m",
+                },
+            }
+        )
+    )
+
+    templates_dir.join("alibaba_linux.jinja2").write(
+        textwrap.dedent(
+            """\
         - name: a packer builder
           type: alibaba
           a-is: {{builder.vars.a}}
-    """))
+    """
+        )
+    )
 
-    templates_dir.join("openstack_windows.jinja2").write(textwrap.dedent("""\
+    templates_dir.join("openstack_windows.jinja2").write(
+        textwrap.dedent(
+            """\
         - name: a packer builder
           type: openstack
-    """))
+    """
+        )
+    )
 
     secrets_file.write(json.dumps([]))
 
@@ -178,16 +201,24 @@ def test_generate_packer_template(tmpdir):
 
     scripts_dir.mkdir("win-worker").join("01-win.ps1").write("ECHO hello")
 
-    var_files_dir.join("bv.yaml").write(json.dumps({
-        "a": 10,
-        "b": 20,
-    }))
+    var_files_dir.join("bv.yaml").write(
+        json.dumps(
+            {
+                "a": 10,
+                "b": 20,
+            }
+        )
+    )
 
-    var_files_dir.join("env.yaml").write(json.dumps({
-        "env_vars": {
-            "AN_ENV_VAR": 'env!',
-        },
-    }))
+    var_files_dir.join("env.yaml").write(
+        json.dumps(
+            {
+                "env_vars": {
+                    "AN_ENV_VAR": "env!",
+                },
+            }
+        )
+    )
 
     packer_template = generate_packer_template(
         builders=["linux", "winny"],
@@ -199,85 +230,84 @@ def test_generate_packer_template(tmpdir):
         secrets_file=str(secrets_file),
     )
 
-    assert(packer_template == {
-        'builders': [
+    assert packer_template == {
+        "builders": [
             {
-                'name': 'a packer builder',
-                'type': 'alibaba',
-                'a-is': 10,
+                "name": "a packer builder",
+                "type": "alibaba",
+                "a-is": 10,
             },
             {
-                'name': 'a packer builder',
-                'type': 'openstack',
+                "name": "a packer builder",
+                "type": "openstack",
             },
         ],
-        'provisioners': [
+        "provisioners": [
             {
-                'type': 'file',
-                'source': './files.tar',
-                'destination': '/tmp/',
+                "type": "file",
+                "source": "./files.tar",
+                "destination": "/tmp/",
             },
             {
-                'type': 'shell',
-                'inline': [
-                    'sudo tar xvf /tmp/files.tar -C / --strip-components=1',
-                    'rm /tmp/files.tar',
+                "type": "shell",
+                "inline": [
+                    "sudo tar xvf /tmp/files.tar -C / --strip-components=1",
+                    "rm /tmp/files.tar",
                 ],
             },
             {
-                'type': 'file',
-                'source': './secrets.tar',
-                'destination': '/tmp/',
+                "type": "file",
+                "source": "./secrets.tar",
+                "destination": "/tmp/",
             },
             {
-                'type': 'shell',
-                'inline': [
-                    'sudo mkdir -p /etc/taskcluster/secrets',
-                    'sudo tar xvf /tmp/secrets.tar -C /',
-                    'sudo chown root:root -R /etc/taskcluster',
-                    'sudo chmod 0400 -R /etc/taskcluster/secrets',
-                    'rm /tmp/secrets.tar',
+                "type": "shell",
+                "inline": [
+                    "sudo mkdir -p /etc/taskcluster/secrets",
+                    "sudo tar xvf /tmp/secrets.tar -C /",
+                    "sudo chown root:root -R /etc/taskcluster",
+                    "sudo chmod 0400 -R /etc/taskcluster/secrets",
+                    "rm /tmp/secrets.tar",
                 ],
-                'only': ['linux'],
+                "only": ["linux"],
             },
             {
-                'type': 'shell',
-                'inline': [
-                    '/usr/bin/cloud-init status --wait',
+                "type": "shell",
+                "inline": [
+                    "/usr/bin/cloud-init status --wait",
                 ],
-                'only': ['linux'],
+                "only": ["linux"],
             },
             {
-                'type': 'shell',
-                'scripts': [str(scripts_dir.join("facebook-worker", "01-fb.sh"))],
-                'environment_vars': ["AN_ENV_VAR=env!"],
-                'execute_command': "do-it",
-                'expect_disconnect': True,
-                'start_retry_timeout': '30m',
-                'only': ['linux'],
+                "type": "shell",
+                "scripts": [str(scripts_dir.join("facebook-worker", "01-fb.sh"))],
+                "environment_vars": ["AN_ENV_VAR=env!"],
+                "execute_command": "do-it",
+                "expect_disconnect": True,
+                "start_retry_timeout": "30m",
+                "only": ["linux"],
             },
             {
-                'type': 'powershell',
-                'scripts': [str(scripts_dir.join("facebook-worker", "01-fb.sh"))],
-                'only': [],
+                "type": "powershell",
+                "scripts": [str(scripts_dir.join("facebook-worker", "01-fb.sh"))],
+                "only": [],
             },
             {
-                'type': 'shell',
-                'scripts': [str(scripts_dir.join("win-worker", "01-win.ps1"))],
-                'environment_vars': None,
-                'execute_command': "do-it",
-                'expect_disconnect': True,
-                'start_retry_timeout': '30m',
-                'only': [],
+                "type": "shell",
+                "scripts": [str(scripts_dir.join("win-worker", "01-win.ps1"))],
+                "environment_vars": None,
+                "execute_command": "do-it",
+                "expect_disconnect": True,
+                "start_retry_timeout": "30m",
+                "only": [],
             },
             {
-                'type': 'powershell',
-                'scripts': [str(scripts_dir.join("win-worker", "01-win.ps1"))],
-                'only': ['winny'],
-            }
+                "type": "powershell",
+                "scripts": [str(scripts_dir.join("win-worker", "01-win.ps1"))],
+                "only": ["winny"],
+            },
         ],
-        'post-processors': [
-            {'type': 'manifest', 'output': 'packer-artifacts.json', 'strip_path': True},
+        "post-processors": [
+            {"type": "manifest", "output": "packer-artifacts.json", "strip_path": True},
         ],
-    })
-
+    }