Add glibc check to Linux build (#1669)

.github/workflows/build_linux.yaml

@@ -137,6 +137,9 @@ jobs:
                   else
                       assert_contains_string "$LIBS" "libsqlcipher.so.0"
                   fi
+
+                  ./scripts/glibc-check.sh dist/linux-*unpacked/element-desktop*
+                  ./scripts/glibc-check.sh dist/linux-*unpacked/resources/app.asar.unpacked/node_modules/matrix-seshat/index.node
               env:
                   ARCH: ${{ steps.config.outputs.arch }}
 

scripts/glibc-check.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+
+# Source https://gist.github.com/vladimyr/9a03481154cd3048a486bdf71e5e1535/57e57a6ace6fb2c8bba948bce726df7a96c3f99f
+# This scripts lets you check which minimum GLIBC version an executable requires.
+# Simply run './glibc-check.sh path/to/your/binary'
+MAX_VER="${MAX_VER:-2.28}"
+
+BINARY="$1"
+
+# Version comparison function in bash
+vercomp() {
+  if [[ $1 == "$2" ]]; then
+    return 0
+  fi
+  local i ver1 ver2
+  IFS="." read -ra ver1 <<<"$1"
+  IFS="." read -ra ver2 <<<"$2"
+  # fill empty fields in ver1 with zeros
+  for ((i = ${#ver1[@]}; i < ${#ver2[@]}; i++)); do
+    ver1[i]=0
+  done
+  for ((i = 0; i < ${#ver1[@]}; i++)); do
+    if [[ -z ${ver2[i]} ]]; then
+      # fill empty fields in ver2 with zeros
+      ver2[i]=0
+    fi
+    if ((10#${ver1[i]} > 10#${ver2[i]})); then
+      return 1
+    fi
+    if ((10#${ver1[i]} < 10#${ver2[i]})); then
+      return 2
+    fi
+  done
+  return 0
+}
+
+IFS="
+"
+VERS=$(objdump -T "$BINARY" | grep GLIBC | sed 's/.*GLIBC_\([.0-9]*\).*/\1/g' | sort -u)
+
+for VER in $VERS; do
+  vercomp "$VER" "$MAX_VER"
+  COMP=$?
+  if [[ $COMP -eq 1 ]]; then
+    echo "Error! ${BINARY} requests GLIBC ${VER}, which is higher than target ${MAX_VER}"
+    echo "Affected symbols:"
+    objdump -T "$BINARY" | grep -F "GLIBC_${VER}"
+    echo "Looking for symbols in libraries..."
+    for LIBRARY in $(ldd "$BINARY" | cut -d ' ' -f 3); do
+      echo "$LIBRARY"
+      objdump -T "$LIBRARY" | grep -F "GLIBC_${VER}"
+    done
+    exit 27
+  else
+    echo "Found version ${VER}"
+  fi
+done