Use kibana-ci-proxy-cache for chrome and gecko drivers (elastic#41581)

* [ci] download chromedriver and geckodriver through a caching proxy

* restore chromedriver and geckodriver caching in bootstrap cache

.ci/packer_cache.sh

@@ -25,6 +25,16 @@ mkdir -p .chromedriver
 curl "https://chromedriver.storage.googleapis.com/$chromedriverDistVersion/chromedriver_linux64.zip" > .chromedriver/chromedriver.zip
 echo "$chromedriverPkgVersion" > .chromedriver/pkgVersion
 
+# cache the geckodriver archive
+geckodriverPkgVersion="$(node -e "console.log(require('./package.json').devDependencies.geckodriver)")"
+if [ -z "$geckodriverPkgVersion" ]; then
+  echo "UNABLE TO DETERMINE geckodriver VERSIONS"
+  exit 1
+fi
+mkdir -p ".geckodriver"
+cp "node_modules/geckodriver/geckodriver.tar.gz" .geckodriver/geckodriver.tar.gz
+echo "$geckodriverPkgVersion" > .geckodriver/pkgVersion
+
 # archive cacheable directories
 mkdir -p "$HOME/.kibana/bootstrap_cache"
 tar -cf "$HOME/.kibana/bootstrap_cache/$branch.tar" \
@@ -35,7 +45,8 @@ tar -cf "$HOME/.kibana/bootstrap_cache/$branch.tar" \
   x-pack/legacy/plugins/reporting/.chromium \
   test/plugin_functional/plugins/*/node_modules \
   .es \
-  .chromedriver;
+  .chromedriver \
+  .geckodriver;
 
 echo "created $HOME/.kibana/bootstrap_cache/$branch.tar"
 

src/dev/ci_setup/setup.sh

@@ -113,29 +113,9 @@ yarn config set yarn-offline-mirror "$cacheDir/yarn-offline-cache"
 yarnGlobalDir="$(yarn global bin)"
 export PATH="$PATH:$yarnGlobalDir"
 
-###
-### use the chromedriver cache if it exists
-###
-if [ -d "$dir/.chromedriver" ]; then
-  branchPkgVersion="$(node -e "console.log(require('./package.json').devDependencies.chromedriver)")"
-  cachedPkgVersion="$(cat "$dir/.chromedriver/pkgVersion")"
-  if [ "$cachedPkgVersion" == "$branchPkgVersion" ]; then
-    export CHROMEDRIVER_FILEPATH="$dir/.chromedriver/chromedriver.zip"
-    export CHROMEDRIVER_SKIP_DOWNLOAD=true
-    echo " -- Using chromedriver cache at $CHROMEDRIVER_FILEPATH"
-  else
-    echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
-    echo "  SKIPPING CHROMEDRIVER CACHE: cached($cachedPkgVersion) branch($branchPkgVersion)"
-    echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
-  fi
-else
-  echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
-  echo "  CHROMEDRIVER CACHE NOT FOUND"
-  echo "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
-fi
-
-# use a proxy to fetch geckodriver asset
-export GECKODRIVER_CDNURL="https://us-central1-elastic-kibana-184716.cloudfunctions.net/geckodriver_cache"
+# use a proxy to fetch chromedriver/geckodriver asset
+export GECKODRIVER_CDNURL="https://us-central1-elastic-kibana-184716.cloudfunctions.net/kibana-ci-proxy-cache"
+export CHROMEDRIVER_CDNURL="https://us-central1-elastic-kibana-184716.cloudfunctions.net/kibana-ci-proxy-cache"
 
 ###
 ### install dependencies