fix: Roll back depot_tools, bypass vpython (#1045)

Using the latest depot_tools no longer works.  depot_tools also wants
to auto-update itself, which must now be disabled.

We also need to disable the copy of python (vpython) included in
depot_tools, since for some distros, it has dependencies on system
libraries that no longer exist.

Finally, we need to force some distros to use python 2, because our
build system is ancient and needs to be ripped out and replaced some
day soon.

This fixes build issues in our CI, our Dockerfiles, and in general on
certain platforms or distros.

Closes #1023

.github/workflows/build_and_test.yaml

@@ -121,7 +121,8 @@ jobs:
       - name: Install depot tools
         shell: bash
         run: |
-          git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+          git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+          touch depot_tools/.disable_auto_update
           echo "${GITHUB_WORKSPACE}/depot_tools" >> $GITHUB_PATH
 
       - name: Setup gclient

.github/workflows/custom-actions/build-packager/action.yaml

@@ -52,12 +52,30 @@ runs:
           echo "::endgroup::"
         fi
 
+    - name: Force Python 2 to support ancient build system (non-Linux only)
+      if: runner.os != 'Linux'
+      uses: actions/setup-python@v2
+      with:
+        python-version: '2.x'
+
+    - name: Force Python 2 to support ancient build system (Linux only)
+      if: runner.os == 'Linux'
+      shell: bash
+      run: |
+        echo "::group::Install python2"
+        sudo apt install -y python2
+        sudo ln -sf python2 /usr/bin/python
+        echo "::endgroup::"
+
     - name: Install depot tools
       shell: bash
       run: |
         echo "::group::Install depot_tools"
-        git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+        git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+        touch depot_tools/.disable_auto_update
         echo "${GITHUB_WORKSPACE}/depot_tools" >> $GITHUB_PATH
+        # Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+        echo "VPYTHON_BYPASS=manually managed python not supported by chrome operations" >> $GITHUB_ENV
         echo "::endgroup::"
 
     - name: Build ninja (arm only)

.github/workflows/github_release.yaml

@@ -200,7 +200,8 @@ jobs:
       - name: Install depot tools
         shell: bash
         run: |
-          git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+          git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+          touch depot_tools/.disable_auto_update
           echo "${GITHUB_WORKSPACE}/depot_tools" >> $GITHUB_PATH
 
       - name: Setup gclient

Dockerfile

@@ -3,14 +3,21 @@ FROM alpine:3.11 as builder
 # Install utilities, libraries, and dev tools.
 RUN apk add --no-cache \
         bash curl \
-        bsd-compat-headers linux-headers \
+        bsd-compat-headers c-ares-dev linux-headers \
         build-base git ninja python2 python3
 
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
+
 # Install depot_tools.
 WORKDIR /
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH $PATH:/depot_tools
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Alpine uses musl which does not have mallinfo defined in malloc.h. Define the
 # structure to workaround a Chromium base bug.
 RUN sed -i \
@@ -18,9 +25,6 @@ RUN sed -i \
     /usr/include/malloc.h
 ENV GYP_DEFINES='musl=1'
 
-# Bypass VPYTHON included by depot_tools, which no longer works in Alpine.
-ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
-
 # Build shaka-packager from the current directory, rather than what has been
 # merged.
 WORKDIR shaka_packager

docs/source/build_instructions.md

@@ -56,14 +56,18 @@ GYP_MSVS_OVERRIDE_PATH="C:/Program Files (x86)/Microsoft Visual Studio/2019/Comm
 
 ## Install `depot_tools`
 
-### Linux and Mac
-
-Clone the `depot_tools` repository from Chromium:
+Clone a particular branch of the `depot_tools` repository from Chromium:
 
 ```shell
-git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+touch depot_tools/.disable_auto_update
 ```
 
+The latest version of depot_tools will not work, so please use that branch!
+
+
+### Linux and Mac
+
 Add `depot_tools` to the end of your PATH (you will probably want to put this
 in your `~/.bashrc` or `~/.zshrc`). Assuming you cloned `depot_tools` to
 `/path/to/depot_tools`:
@@ -74,17 +78,8 @@ export PATH="$PATH:/path/to/depot_tools"
 
 ### Windows
 
-Download the
-[depot_tools bundle](https://storage.googleapis.com/chrome-infra/depot_tools.zip)
-and extract it somewhere.
-
-**WARNING: DO NOT** use drag-n-drop or copy-n-paste extract from Explorer,
-this will not extract the hidden “.git” folder which is necessary for
-depot_tools to autoupdate itself. You can use “Extract all…” from the context
-menu though.
-
 Add depot_tools to the start of your PATH (must be ahead of any installs of
-Python). Assuming you unzipped the bundle to C:\src\depot_tools, open:
+Python). Assuming you cloned the repo to C:\src\depot_tools, open:
 
 Control Panel → System and Security → System → Advanced system settings
 

packager/testing/dockers/Alpine_Dockerfile

@@ -6,11 +6,18 @@ RUN apk add --no-cache \
         bsd-compat-headers c-ares-dev linux-headers \
         build-base git ninja python2 python3
 
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
+
 # Install depot_tools.
 WORKDIR /
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH $PATH:/depot_tools
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Alpine uses musl which does not have mallinfo defined in malloc.h. Define the
 # structure to workaround a Chromium base bug.
 RUN sed -i \
@@ -18,8 +25,5 @@ RUN sed -i \
     /usr/include/malloc.h
 ENV GYP_DEFINES='musl=1'
 
-# Bypass VPYTHON included by depot_tools, which no longer works in Alpine.
-ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
-
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".

packager/testing/dockers/ArchLinux_Dockerfile

@@ -6,10 +6,17 @@ RUN pacman -Sy --needed --noconfirm \
         c-ares \
         gcc git python2 python3
 
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
+
 # Install depot_tools.
 WORKDIR /
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH /depot_tools:$PATH
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".

packager/testing/dockers/CentOS_Dockerfile

@@ -1,18 +1,28 @@
 FROM centos:8
 
+# Fix up CentOS repo info, which is outdated and not maintained in DockerHub.
+# See https://stackoverflow.com/a/71309215
+RUN cd /etc/yum.repos.d/
+RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
+RUN sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
+
 # Install utilities, libraries, and dev tools.
 RUN yum install -y \
         which \
         c-ares-devel libatomic \
         gcc-c++ git python2 python3
 
-# Default to python3.
-RUN alternatives --set python /usr/bin/python3
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
 
 # Install depot_tools.
 WORKDIR /
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH /depot_tools:$PATH
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".

packager/testing/dockers/Debian_Dockerfile

@@ -7,9 +7,16 @@ RUN apt-get install -y \
         libc-ares-dev \
         build-essential git python python3
 
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
+
 # Install depot_tools.
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH /depot_tools:$PATH
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".

packager/testing/dockers/Fedora_Dockerfile

@@ -6,13 +6,17 @@ RUN yum install -y \
         c-ares-devel libatomic \
         gcc-c++ git python2
 
-# Default to python3.
-RUN alternatives --install /usr/bin/python python /usr/bin/python3 3
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
 
 # Install depot_tools.
 WORKDIR /
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH /depot_tools:$PATH
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".

packager/testing/dockers/OpenSUSE_Dockerfile

@@ -6,10 +6,17 @@ RUN zypper in -y \
         c-ares-devel \
         gcc-c++ git python python3
 
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
+
 # Install depot_tools.
 WORKDIR /
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH /depot_tools:$PATH
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".

packager/testing/dockers/Ubuntu_Dockerfile

@@ -7,9 +7,16 @@ RUN apt-get install -y \
         libc-ares-dev \
         build-essential git python python3
 
+# Default to python2 because our build system is ancient.
+RUN ln -sf python2 /usr/bin/python
+
 # Install depot_tools.
-RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN git clone -b chrome/4147 https://chromium.googlesource.com/chromium/tools/depot_tools.git
+RUN touch depot_tools/.disable_auto_update
 ENV PATH /depot_tools:$PATH
 
+# Bypass VPYTHON included by depot_tools.  Prefer the system installation.
+ENV VPYTHON_BYPASS="manually managed python not supported by chrome operations"
+
 # Build and run this docker by mapping shaka-packager with
 # -v "shaka-packager:/shaka-packager".