Revert "mach: switch to uv for managing python venv (#34504)" (#34548)

This reverts commit 4103421ba5.

Signed-off-by: Mukilan Thiyagarajan <mukilan@igalia.com>

.github/actions/setup-python/action.yml

@@ -1,20 +0,0 @@
-name: Setup Python and uv
-inputs:
-  skip-python-setup:
-    required: false
-    description: "Whether to skip installing python using Github's `setup-python` action"
-    default: false
-runs:
-  using: "composite"
-  steps:
-    # Use the setup-python action to take advantage of the cache. uv will
-    # symlink to this version.
-    - name: Setup system python
-      if: ${{ inputs.skip-python-setup != 'true' }}
-      uses: actions/setup-python@v5
-      with:
-        python-version-file: '.python-version'
-    - name: Install uv
-      uses: astral-sh/setup-uv@v4
-      with:
-        version: "0.5.6"

.github/workflows/android.yml

@@ -59,8 +59,8 @@ jobs:
         uses: mozilla-actions/sccache-action@v0.0.6
       - name: Install crown
         run: cargo install --path support/crown
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+      - name: Bootstrap Python
+        run: python3 -m pip install --upgrade pip virtualenv
       - name: Bootstrap dependencies
         run: sudo apt update && python3 ./mach bootstrap --skip-lints
       - name: Set up JDK 17

.github/workflows/docs.yml

@@ -13,10 +13,9 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Bootstrap
         run: |
+          python3 -m pip install --upgrade pip
           sudo apt update
           python3 ./mach bootstrap --skip-lints
       - name: Set LIBCLANG_PATH # This is needed for bindgen in mozangle.

.github/workflows/lint.yml

@@ -31,8 +31,9 @@ jobs:
         uses: mozilla-actions/sccache-action@v0.0.6
       - name: Set LIBCLANG_PATH env # needed for bindgen in mozangle
         run: echo "LIBCLANG_PATH=/usr/lib/llvm-14/lib" >> $GITHUB_ENV
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
       - name: Install taplo
         uses: baptiste0928/cargo-install@v3
         with:
@@ -45,6 +46,8 @@ jobs:
           locked: true
           # 0.16.2 requires Rust 1.81 or newer.
           version: '0.16.1'
+      - name: Bootstrap Python
+        run: python3 -m pip install --upgrade pip
       - name: Bootstrap dependencies
         run: |
           sudo apt update

.github/workflows/linux-wpt.yml

@@ -52,10 +52,9 @@ jobs:
           path: ${{ inputs.profile }}-binary-linux
       - name: unPackage binary
         run: tar -xzf ${{ inputs.profile }}-binary-linux/target.tar.gz
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Bootstrap dependencies
         run: |
+          python3 -m pip install --upgrade pip
           sudo apt update
           sudo apt install -qy --no-install-recommends mesa-vulkan-drivers
           python3 ./mach bootstrap --skip-lints

.github/workflows/linux.yml

@@ -139,10 +139,13 @@ jobs:
       - name: Set LIBCLANG_PATH env # needed for bindgen in mozangle
         if: ${{ ! fromJSON(needs.runner-select.outputs.is-self-hosted) && !inputs.upload }} # not needed on ubuntu 20.04 used for nightly
         run: echo "LIBCLANG_PATH=/usr/lib/llvm-14/lib" >> $GITHUB_ENV
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+      - uses: actions/setup-python@v5
+        if: ${{ ! fromJSON(needs.runner-select.outputs.is-self-hosted) }}
         with:
-          skip-python-setup: ${{ fromJSON(needs.runner-select.outputs.is-self-hosted) }}
+          python-version: '3.10'
+      - name: Bootstrap Python
+        if: ${{ ! fromJSON(needs.runner-select.outputs.is-self-hosted) }}
+        run: python3 -m pip install --upgrade pip
       - name: Bootstrap dependencies
         if: ${{ ! fromJSON(needs.runner-select.outputs.is-self-hosted) }}
         run: |

.github/workflows/mac-wpt.yml

@@ -41,11 +41,15 @@ jobs:
       - uses: actions/download-artifact@v4
         with:
           name: ${{ inputs.profile }}-binary-macos
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+      # Python 3.13 breaks wptrunner, so pin the version until
+      # web-platform-tests/wpt#48585 is fixed.
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
       - name: Prep test environment
         run: |
           gtar -xzf target.tar.gz
+          python3 -m pip install --upgrade pip
           python3 ./mach bootstrap --skip-lints
       - name: Smoketest
         run: python3 ./mach smoketest --${{ inputs.profile }}

.github/workflows/mac.yml

@@ -77,14 +77,18 @@ jobs:
         if: github.event_name == 'pull_request_target'
         with:
           ref: ${{ github.event.pull_request.head.sha }}
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+      # Python 3.13 breaks wptrunner, so pin the version until
+      # web-platform-tests/wpt#48585 is fixed.
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
       - name: Run sccache-cache
         uses: mozilla-actions/sccache-action@v0.0.6
       - name: Install crown
         run: cargo install --path support/crown
       - name: Bootstrap
         run: |
+          python3 -m pip install --upgrade pip
           python3 ./mach bootstrap --skip-lints
           brew install gnu-tar
       - name: Build (${{ inputs.profile }})

.github/workflows/main.yml

@@ -20,16 +20,15 @@ jobs:
     outputs:
       configuration: ${{ steps.configuration.outputs.result }}
     steps:
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
       - uses: actions/checkout@v4
         with:
           fetch-depth: 1
           sparse-checkout: |
             python/servo/try_parser.py
-            .github/actions/setup-python
-            .python-version
           sparse-checkout-cone-mode: false
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Get Configuration
         id: configuration
         run: |

.github/workflows/ohos.yml

@@ -53,8 +53,8 @@ jobs:
         uses: mozilla-actions/sccache-action@v0.0.6
       - name: Install crown
         run: cargo install --path support/crown
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+      - name: Bootstrap Python
+        run: python3 -m pip install --upgrade pip virtualenv
       - name: Bootstrap dependencies
         run: sudo apt update && python3 ./mach bootstrap --skip-lints
       - name: Setup OpenHarmony SDK

.github/workflows/pull-request-wpt-export.yml

@@ -28,16 +28,10 @@ jobs:
           # using the token specified here.
           # See https://github.com/actions/checkout/issues/162.
           token: ${{ secrets.WPT_SYNC_TOKEN }}
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Install requirements
-        run: |
-          uv venv
-          uv pip install -r servo/python/requirements.txt
+        run: pip install -r servo/python/requirements.txt
       - name: Process pull request
-        run: |
-         source .venv/bin/activate
-         servo/python/wpt/export.py
+        run: servo/python/wpt/export.py
         env:
           GITHUB_CONTEXT: ${{ toJson(github) }}
           WPT_SYNC_TOKEN: ${{ secrets.WPT_SYNC_TOKEN }}

.github/workflows/scheduled-wpt-import.yml

@@ -35,10 +35,9 @@ jobs:
       - uses: actions/download-artifact@v4
         with:
           name: wpt-full-logs-linux-layout-2020
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Prep environment
         run: |
+          python3 -m pip install --upgrade pip
           sudo apt update
           python3 ./mach bootstrap
       - name: Add upstream remote

.github/workflows/try-label.yml

@@ -77,15 +77,14 @@ jobs:
             }
 
             return try_string;
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
       - uses: actions/checkout@v4
         with:
           sparse-checkout: |
             python/servo/try_parser.py
-            .github/actions/setup-python
-            .python-version
           sparse-checkout-cone-mode: false
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Parse Labels
         if: ${{ steps.try_string.outputs.result }}
         id: configuration

.github/workflows/try.yml

@@ -32,16 +32,15 @@ jobs:
     outputs:
       configuration: ${{ steps.configuration.outputs.result }}
     steps:
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
       - uses: actions/checkout@v4
         with:
           fetch-depth: 1
           sparse-checkout: |
             python/servo/try_parser.py
-            .github/actions/setup-python
-            .python-version
           sparse-checkout-cone-mode: false
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
       - name: Get Full Configuration
         id: full_config
         run: |

.github/workflows/windows.yml

@@ -114,13 +114,13 @@ jobs:
           choco install wixtoolset
           echo "C:\\Program Files (x86)\\WiX Toolset v3.11\\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
       - uses: actions/setup-python@v5
-      - name: Setup Python
-        uses: ./.github/actions/setup-python
+        if: ${{ ! fromJSON(needs.runner-select.outputs.is-self-hosted) }}
         with:
-          skip-python-setup: ${{ fromJSON(needs.runner-select.outputs.is-self-hosted) }}
+          python-version: "3.10"
       - name: Bootstrap
         if: ${{ ! fromJSON(needs.runner-select.outputs.is-self-hosted) }}
         run: |
+          python -m pip install --upgrade pip
           python mach fetch
           python mach bootstrap-gstreamer
       # For some reason WiX isn't currently on the GitHub runner path. This is a

.python-version

@@ -1 +0,0 @@
-3.12

README.md

@@ -17,8 +17,7 @@ For more detailed build instructions, see the Servo book under [Setting up your
 
 ### macOS
 
-- Download and install [`python`](https://www.python.org/downloads/macos/), [Xcode](https://developer.apple.com/xcode/), and [`brew`](https://brew.sh/).
-- Install `uv`: `curl -LsSf https://astral.sh/uv/install.sh | sh` 
+- Download and install [`python`](https://www.python.org/downloads/macos/) (version 3.10 to 3.12), [Xcode](https://developer.apple.com/xcode/), and [`brew`](https://brew.sh/).
 - Install `rustup`: `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh`
 - Restart your shell to make sure `cargo` is available
 - Install the other dependencies: `./mach bootstrap`
@@ -26,12 +25,11 @@ For more detailed build instructions, see the Servo book under [Setting up your
 
 ### Linux
 
-- Install `curl` and `python`:
-  - Arch: `sudo pacman -S --needed curl python`
-  - Debian, Ubuntu: `sudo apt install curl`
-  - Fedora: `sudo dnf install curl python3`
-  - Gentoo: `sudo emerge net-misc/curl`
-- Install `uv`: `curl -LsSf https://astral.sh/uv/install.sh | sh` 
+- Install `curl` and `python` (version 3.10 to 3.12):
+  - Arch: `sudo pacman -S --needed curl python python-pip`
+  - Debian, Ubuntu: `sudo apt install curl python3-pip python3-venv python3-setuptools`
+  - Fedora: `sudo dnf install curl python3 python3-pip python3-devel`
+  - Gentoo: `sudo emerge net-misc/curl dev-python/pip`
 - Install `rustup`: `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh`
 - Restart your shell to make sure `cargo` is available
 - Install the other dependencies: `./mach bootstrap`
@@ -39,7 +37,7 @@ For more detailed build instructions, see the Servo book under [Setting up your
 
 ### Windows
 
-- Download and install [`python`](https://www.python.org/downloads/windows/), [`uv`](https://docs.astral.sh/uv/getting-started/installation/#standalone-installer), [`choco`](https://chocolatey.org/install#individual), and [`rustup`](https://win.rustup.rs/)
+- Download and install [`python`](https://www.python.org/downloads/windows/) (version 3.10 to 3.12), [`choco`](https://chocolatey.org/install#individual), and [`rustup`](https://win.rustup.rs/)
   - Be sure to select *Quick install via the Visual Studio Community installer*
 - In the Visual Studio Installer, ensure the following components are installed:
   - **Windows 10 SDK (10.0.19041.0)** (`Microsoft.VisualStudio.Component.Windows10SDK.19041`)

mach

@@ -9,9 +9,10 @@ import sys
 # Destructure because version_info > max_ver is true when running the same version.
 ver = (sys.version_info[0], sys.version_info[1])
 min_ver = (3, 10)
-if ver < min_ver:
-    print("mach requires at least version 3.{0} of Python. The version of Python installed in this system is {1}.{2}" \
-        .format(min_ver[1], ver[0], ver[1]))
+max_ver = (3, 12) # WPT does not support Python 3.13. See issue #34095.
+if ver < min_ver or ver > max_ver:
+    print("mach does not support python {0}.{1}, please install 3.{2} <= python <= 3.{3}" \
+        .format(ver[0], ver[1], min_ver[1], max_ver[1]))
     sys.exit(1)
 
 def main(args):

python/mach_bootstrap.py

@@ -4,6 +4,7 @@
 
 import hashlib
 import os
+import platform
 import site
 import subprocess
 import sys
@@ -92,11 +93,9 @@ def _get_virtualenv_script_dir():
 def _get_virtualenv_lib_dir():
     if os.name == "nt" and os.sep != "/":
         return os.path.join("Lib", "site-packages")
-    with open(".python-version", "r") as python_version_file:
-        python_version = python_version_file.read().strip()
     return os.path.join(
         "lib",
-            f"python{python_version}",
+        f"python{sys.version_info[0]}.{sys.version_info[1]}",
         "site-packages"
     )
 
@@ -132,8 +131,11 @@ def install_virtual_env_requirements(project_path: str, python: str, virtualenv_
     requirements_hash = requirements_hasher.hexdigest()
 
     if marker_hash != requirements_hash:
+        print(" * Upgrading pip...")
+        _process_exec([python, "-m", "pip", "install", "--upgrade", "pip"])
+
         print(" * Installing Python requirements...")
-        _process_exec(["uv", "pip", "install",
+        _process_exec([python, "-m", "pip", "install", "-I",
                        "-r", requirements_paths[0],
                        "-r", requirements_paths[1],
                        "-r", requirements_paths[2]])
@@ -142,14 +144,14 @@ def install_virtual_env_requirements(project_path: str, python: str, virtualenv_
 
 
 def _activate_virtualenv(topdir):
-    virtualenv_path = os.path.join(topdir, ".venv")
+    virtualenv_path = os.path.join(topdir, "python", "_venv%d.%d" % (sys.version_info[0], sys.version_info[1]))
     python = sys.executable
 
     if os.environ.get("VIRTUAL_ENV") != virtualenv_path:
         venv_script_path = os.path.join(virtualenv_path, _get_virtualenv_script_dir())
         if not os.path.exists(virtualenv_path):
             print(" * Setting up virtual environment...")
-            _process_exec(["uv", "venv"])
+            _process_exec([python, "-m", "venv", "--system-site-packages", virtualenv_path])
 
         # This general approach is taken from virtualenv's `activate_this.py`.
         os.environ["PATH"] = os.pathsep.join([venv_script_path, *os.environ.get("PATH", "").split(os.pathsep)])
@@ -169,11 +171,6 @@ def _activate_virtualenv(topdir):
 
     install_virtual_env_requirements(topdir, python, virtualenv_path)
 
-    # Turn off warnings about deprecated syntax in our indirect dependencies.
-    # TODO: Find a better approach for doing this.
-    import warnings
-    warnings.filterwarnings('ignore', category=SyntaxWarning, module=r'.*.venv')
-
 
 def _ensure_case_insensitive_if_windows():
     # The folder is called 'python'. By deliberately checking for it with the wrong case, we determine if the file
@@ -224,6 +221,13 @@ def bootstrap(topdir):
         print('Current path:', topdir)
         sys.exit(1)
 
+    # Ensure we are running Python 3.10+. We put this check here so we generate a
+    # user-friendly error message rather than a cryptic stack trace on module import.
+    if sys.version_info < (3, 10):
+        print('Python3 (>=3.10) is required to run mach.')
+        print('You are running Python', platform.python_version())
+        sys.exit(1)
+
     _activate_virtualenv(topdir)
 
     def populate_context(context, key=None):

python/servo/build_commands.py

@@ -175,7 +175,7 @@ class MachCommands(CommandBase):
         return status
 
     @Command('clean',
-             description='Clean the target/ and Python virtual environment directories',
+             description='Clean the target/ and python/_venv[version]/ directories',
              category='build')
     @CommandArgument('--manifest-path',
                      default=None,
@@ -188,7 +188,8 @@ class MachCommands(CommandBase):
     def clean(self, manifest_path=None, params=[], verbose=False):
         self.ensure_bootstrapped()
 
-        virtualenv_path = path.join(self.get_top_dir(), '.venv')
+        virtualenv_fname = '_venv%d.%d' % (sys.version_info[0], sys.version_info[1])
+        virtualenv_path = path.join(self.get_top_dir(), 'python', virtualenv_fname)
         if path.exists(virtualenv_path):
             print('Removing virtualenv directory: %s' % virtualenv_path)
             shutil.rmtree(virtualenv_path)

servo-tidy.toml

@@ -117,6 +117,7 @@ directories = [
     "./tests/wpt/mozilla/tests/mozilla/referrer-policy",
     "./tests/wpt/mozilla/tests/webgl",
     "./python/tidy/tests",
+    "./python/_v*",
     "./python/mach",
     # Generated and upstream code combined with our own. Could use cleanup
     "./target",

shell.nix

@@ -84,13 +84,7 @@ stdenv.mkDerivation (androidEnvironment // {
 
     # Build utilities
     cmake dbus gcc git pkg-config which llvm perl yasm m4
-
-    # Ensure the Python version is same as the one in `.python-version` file so
-    # that `uv` will just symlink to the one in nix store. Otherwise `uv` will
-    # download a pre-built binary that won't work on nix.
-    # FIXME: dbus python module needs to be installed into the virtual environment.
-    python312
-    uv
+    (python3.withPackages (ps: with ps; [virtualenv pip dbus]))
 
     # This pins gnumake to 4.3 since 4.4 breaks jobserver
     # functionality in mozjs and causes builds to be extremely