Add download retry helper on Ubuntu (#955)

* Add download retry helper

images/linux/scripts/installers/pypy.sh

@@ -6,6 +6,7 @@
 
 # Source the helpers for use with the script
 source $HELPER_SCRIPTS/document.sh
+source $HELPER_SCRIPTS/install.sh
 
 # This function installs PyPy using the specified arguments:
 #   $1=PACKAGE_URL
@@ -16,7 +17,7 @@ function InstallPyPy
     PACKAGE_TAR_NAME=$(echo $PACKAGE_URL | awk -F/ '{print $NF}')
     echo "Downloading tar archive '$PACKAGE_TAR_NAME' - '$PACKAGE_URL'"
     PACKAGE_TAR_TEMP_PATH="/tmp/$PACKAGE_TAR_NAME"
-    wget -q -O $PACKAGE_TAR_TEMP_PATH $PACKAGE_URL
+    download_with_retries $PACKAGE_URL "/tmp" $PACKAGE_TAR_NAME
 
     echo "Expand '$PACKAGE_TAR_NAME' to the /tmp folder"
     tar xf $PACKAGE_TAR_TEMP_PATH -C /tmp
@@ -69,28 +70,11 @@ function InstallPyPy
     rm -f $PACKAGE_TAR_TEMP_PATH
 }
 
-function getPyPyVersions
-{
-    uri="https://downloads.python.org/pypy/"
-    i=20
-
-    while [ $i -gt 0 ]; do
-        ((i--))
-        result="$(curl -4 -s --compressed $uri | grep 'linux64' | awk -v uri="$uri" -F'>|<' '{print uri$5}')"
-        if [ -z "$result" ]; then
-            sleep 30
-        else
-            echo "$result"
-            return
-        fi
-    done
-
-    echo "There are no more attempts to retrive PyPy version"
-    exit 1
-}
-
 # Installation PyPy
-pypyVersions=$(getPyPyVersions)
+uri="https://downloads.python.org/pypy/"
+download_with_retries $uri "/tmp" "pypyUrls.html"
+pypyVersions="$(cat /tmp/pypyUrls.html | grep 'linux64' | awk -v uri="$uri" -F'>|<' '{print uri$5}')"
+
 toolsetJson="$INSTALLER_SCRIPT_FOLDER/toolset.json"
 toolsetVersions=$(cat $toolsetJson | jq -r '.toolcache[] | select(.name | contains("PyPy")) | .versions[]')