From 5eb5f30fe9d5134ffd8ef2ea44e05b59fca0433c Mon Sep 17 00:00:00 2001
From: theofficialgman <28281419+theofficialgman@users.noreply.github.com>
Date: Thu, 8 Jun 2023 18:09:06 -0400
Subject: [PATCH] Lower GLIBC requirements by using chromium reversion script
 and patches

---
 .github/workflows/pushaction.yml    | 54 +++++++++++++++++++++++++++++
 .github/workflows/releaseaction.yml | 54 +++++++++++++++++++++++++++++
 2 files changed, 108 insertions(+)

diff --git a/.github/workflows/pushaction.yml b/.github/workflows/pushaction.yml
index ce7887e..19104dc 100644
--- a/.github/workflows/pushaction.yml
+++ b/.github/workflows/pushaction.yml
@@ -94,6 +94,60 @@ jobs:
       run: sudo apt-get -yq install gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf binutils-arm-linux-gnueabihf
     - name: Install Linux arm64 compilers/libraries
       run: sudo apt-get -yq install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu binutils-aarch64-linux-gnu
+    - name: Add patches to minimize needed GLIBC version
+      run: |
+        CURRENT_DIR="$(pwd)"
+        sudo apt-get -yq install python3
+        # download chromium reversion_glibc.py script from chromium source tree at pinned commit (incase they ever move or change it)
+        wget https://raw.githubusercontent.com/chromium/chromium/01bc42d648c45439e1beef8fd25fde3aef9079bc/build/linux/sysroot_scripts/reversion_glibc.py -O /tmp/reversion_glibc.py
+        # set targeted minimum GLIBC to 2.17
+        sed -i 's/26]/17]/g' /tmp/reversion_glibc.py
+        chmod +x /tmp/reversion_glibc.py
+
+        # download the host libc6 package from apt and patch the binaries in it
+        # replacing the host libc6 at runtime causes crashs and hangs but apt is able to do it without issue
+        sudo apt-get install --download-only --reinstall -y libc6
+        sudo rm -rf /tmp/libc6
+        sudo mkdir /tmp/libc6
+        sudo cp /var/cache/apt/archives/libc6_2.31-*_amd64.deb /tmp/libc6
+        cd /tmp/libc6
+        deb_name="$(ls)"
+        sudo ar x "$deb_name"
+        sudo tar xf data.tar.xz
+        sudo mkdir DEBIAN
+        sudo tar xf control.tar.xz -C DEBIAN
+        sudo rm -f control.tar.xz \
+          data.tar.xz \
+          debian-binary \
+          DEBIAN/md5sums \
+          DEBIAN/archives \
+          DEBIAN/conffiles \
+          "$deb_name"
+        
+        # patch libc6 in host download deb and cross compilers using the reversion_glibc.py script
+        files=(/tmp/libc6/lib/x86_64-linux-gnu/libc.so.6 /tmp/libc6/lib/x86_64-linux-gnu/libm.so.6
+        /usr/aarch64-linux-gnu/lib/libc.so.6 /usr/aarch64-linux-gnu/lib/libm.so.6 \
+        /usr/arm-linux-gnueabihf/lib/libc.so.6 /usr/arm-linux-gnueabihf/lib/libm.so.6 \
+        /libx32/libc.so.6 /libx32/libm.so.6 \
+        /lib32/libc.so.6 /lib32/libm.so.6)
+        for file in "${files[@]}"; do
+          sudo python3 /tmp/reversion_glibc.py "$file"
+        done
+        
+        # install patched libc6 deb
+        sudo dpkg-deb -b . "$deb_name"
+        sudo apt install --reinstall --allow-downgrades -y ./"$deb_name"
+        cd "$CURRENT_DIR"
+
+        # __GLIBC_MINOR__ is used as a feature test macro.  Replace it with the
+        # earliest supported version of glibc 2.17
+        sudo sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 17 //|' "/usr/include/features.h"
+        sudo sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 17 //|' "/usr/aarch64-linux-gnu/include/features.h"
+        sudo sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 17 //|' "/usr/arm-linux-gnueabihf/include/features.h"
+        # fcntl64() was introduced in glibc 2.28.  Make sure to use fcntl() instead.
+        sudo sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' "/usr/include/fcntl.h"
+        sudo sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' "/usr/aarch64-linux-gnu/include/fcntl.h"
+        sudo sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' "/usr/arm-linux-gnueabihf/include/fcntl.h"
     - name: Download macOS natives
       uses: actions/download-artifact@v3
       with:
diff --git a/.github/workflows/releaseaction.yml b/.github/workflows/releaseaction.yml
index 0f6c890..723ae50 100644
--- a/.github/workflows/releaseaction.yml
+++ b/.github/workflows/releaseaction.yml
@@ -93,6 +93,60 @@ jobs:
       run: sudo apt-get -yq install gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf binutils-arm-linux-gnueabihf
     - name: Install Linux arm64 compilers/libraries
       run: sudo apt-get -yq install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu binutils-aarch64-linux-gnu
+    - name: Add patches to minimize needed GLIBC version
+      run: |
+        CURRENT_DIR="$(pwd)"
+        sudo apt-get -yq install python3
+        # download chromium reversion_glibc.py script from chromium source tree at pinned commit (incase they ever move or change it)
+        wget https://raw.githubusercontent.com/chromium/chromium/01bc42d648c45439e1beef8fd25fde3aef9079bc/build/linux/sysroot_scripts/reversion_glibc.py -O /tmp/reversion_glibc.py
+        # set targeted minimum GLIBC to 2.17
+        sed -i 's/26]/17]/g' /tmp/reversion_glibc.py
+        chmod +x /tmp/reversion_glibc.py
+
+        # download the host libc6 package from apt and patch the binaries in it
+        # replacing the host libc6 at runtime causes crashs and hangs but apt is able to do it without issue
+        sudo apt-get install --download-only --reinstall -y libc6
+        sudo rm -rf /tmp/libc6
+        sudo mkdir /tmp/libc6
+        sudo cp /var/cache/apt/archives/libc6_2.31-*_amd64.deb /tmp/libc6
+        cd /tmp/libc6
+        deb_name="$(ls)"
+        sudo ar x "$deb_name"
+        sudo tar xf data.tar.xz
+        sudo mkdir DEBIAN
+        sudo tar xf control.tar.xz -C DEBIAN
+        sudo rm -f control.tar.xz \
+          data.tar.xz \
+          debian-binary \
+          DEBIAN/md5sums \
+          DEBIAN/archives \
+          DEBIAN/conffiles \
+          "$deb_name"
+        
+        # patch libc6 in host download deb and cross compilers using the reversion_glibc.py script
+        files=(/tmp/libc6/lib/x86_64-linux-gnu/libc.so.6 /tmp/libc6/lib/x86_64-linux-gnu/libm.so.6
+        /usr/aarch64-linux-gnu/lib/libc.so.6 /usr/aarch64-linux-gnu/lib/libm.so.6 \
+        /usr/arm-linux-gnueabihf/lib/libc.so.6 /usr/arm-linux-gnueabihf/lib/libm.so.6 \
+        /libx32/libc.so.6 /libx32/libm.so.6 \
+        /lib32/libc.so.6 /lib32/libm.so.6)
+        for file in "${files[@]}"; do
+          sudo python3 /tmp/reversion_glibc.py "$file"
+        done
+        
+        # install patched libc6 deb
+        sudo dpkg-deb -b . "$deb_name"
+        sudo apt install --reinstall --allow-downgrades -y ./"$deb_name"
+        cd "$CURRENT_DIR"
+
+        # __GLIBC_MINOR__ is used as a feature test macro.  Replace it with the
+        # earliest supported version of glibc 2.17
+        sudo sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 17 //|' "/usr/include/features.h"
+        sudo sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 17 //|' "/usr/aarch64-linux-gnu/include/features.h"
+        sudo sed -i 's|\(#define\s\+__GLIBC_MINOR__\)|\1 17 //|' "/usr/arm-linux-gnueabihf/include/features.h"
+        # fcntl64() was introduced in glibc 2.28.  Make sure to use fcntl() instead.
+        sudo sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' "/usr/include/fcntl.h"
+        sudo sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' "/usr/aarch64-linux-gnu/include/fcntl.h"
+        sudo sed -i '{N; s/#ifndef __USE_FILE_OFFSET64\(\nextern int fcntl\)/#if 1\1/}' "/usr/arm-linux-gnueabihf/include/fcntl.h"
     - name: Download macOS natives
       uses: actions/download-artifact@v3
       with: