Create chromedriver.sh

chromedriver.sh

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+#!/bin/sh -e
+
+# This implements https://chromedriver.chromium.org/downloads/version-selection
+# to install the latest version of ChromeDriver that's compatible with the
+# current google-chrome binary.
+
+# Default location where the chromedriver executable will be installed.
+# This is a symlink; version-suffixed binaries live alongside it.
+destlink=${HOME}/local/bin/chromedriver
+
+# The destination can be overridden via the command line.
+if [ $# -ge 1 ]; then
+  if [ "$1" = '-h' ] || [ "$1" = '-help' ] || [ "$1" = '--help' ]; then
+    cat <<EOF >&2
+Usage: ${0} [dest-symlink]
+Download the appropriate version of ChromeDriver.
+
+The executable will be placed alongside a symlink at
+${destlink} by default.
+EOF
+    exit 2
+  fi
+  destlink=$1
+fi
+
+# Check that we'll be able to run the linux64 version of ChromeDriver.
+hwname=$(uname -m)
+if [ "$hwname" != x86_64 ]; then
+  echo "Unsupported hardware name '${hwname}' from 'uname -m'"
+  exit 1
+fi
+
+# google-chrome --version prints a line like "Google Chrome 96.0.4664.93 " (yes,
+# with a trailing space): https://www.chromium.org/developers/version-numbers/
+vstring=$(google-chrome --version)
+cver=$(echo "$vstring" | sed -nre 's/^Google Chrome ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)\s*$/\1/p')
+if [ -z "$cver" ]; then
+  echo "Failed parsing Chrome version '${vstring}'"
+  exit 1
+fi
+
+major=$(echo "$cver" | cut -d. -f 1)
+minor=$(echo "$cver" | cut -d. -f 2)
+build=$(echo "$cver" | cut -d. -f 3)
+
+if [ "$major" -ge 115 ]; then
+  # Starting with Chrome 115, there's an endpoint at that returns a massive JSON
+  # object listing all releases.
+  re=^${major}\\\\.${minor}\\\\.${build}\\\\.
+  url=$(
+    wget --quiet -O- https://googlechromelabs.github.io/chrome-for-testing/known-good-versions-with-downloads.json |
+    jq -r '.versions[] | select(.version | test("'"${re}"'")) | .downloads.chromedriver[] | select(.platform == "linux64") | .url' |
+    tail -1
+  )
+  if [ -z "$url" ]; then
+    echo "Failed finding latest release matching /${re}/"
+    exit 1
+  fi
+
+  # Extract the release from a URL like this:
+  # https://edgedl.me.gvt1.com/edgedl/chrome/chrome-for-testing/119.0.6045.0/linux64/chrome-linux64.zip
+  rel=$(echo "$url" | sed -nre 's!.*/([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/.*!\1!p')
+  if [ -z "$url" ]; then
+    echo "Failed getting version number from '${url}'"
+    exit 1
+  fi
+
+  # The executable also seems to be located in a subdirectory now.
+  srcfile=chromedriver-linux64/chromedriver
+else
+  # We need "MAJOR.MINOR.BUILD", e.g. "96.0.4664". Get the file containing the
+  # latest compatible ChromeDriver release number.
+  short=$(echo "$build" | sed -re 's/\.[0-9]+$//')
+  rel=$(wget --quiet -O- "https://chromedriver.storage.googleapis.com/LATEST_RELEASE_${short}")
+  url=https://chromedriver.storage.googleapis.com/${rel}/chromedriver_linux64.zip
+  srcfile=chromedriver
+fi
+
+echo "Need ChromeDriver ${rel} for Chrome ${cver}"
+
+# Download the appropriate version if we don't already have it.
+destfile=${destlink}.${rel}
+if [ ! -e "$destfile" ]; then
+  tmpdir=$(mktemp --directory -t chromedriver.XXXXXXXXXX)
+  zipfile=${tmpdir}/$(basename "$url")
+  echo "Downloading ${url} to ${tmpdir}"
+  wget --quiet -O "$zipfile" "$url"
+
+  echo "Extracting archive to ${destfile}"
+  unzip -q "$zipfile" -d "$tmpdir"
+  mv "${tmpdir}/${srcfile}" "$destfile"
+  chmod 0755 "$destfile"
+  rm -rf "$tmpdir"
+fi
+
+# If there's already a regular file in place of the link, move it away.
+if [ -e "$destlink" ] && [ ! -L "$destlink" ]; then
+  echo "Moving ${destlink} to ${destlink}.old"
+  mv "$destlink" "${destlink}.old"
+fi
+
+ln -sf "$(basename "$destfile")" "$destlink"
+echo "ChromeDriver ${rel} installed to ${destlink}"