fix(scripts): scrape for the latest v2/v3 release from the releases page

Signed-off-by: Matthew Fisher <matt.fisher@microsoft.com>

scripts/get

@@ -78,16 +78,14 @@ verifySupported() {
 # checkDesiredVersion checks if the desired version is available.
 checkDesiredVersion() {
   if [ "x$DESIRED_VERSION" == "x" ]; then
-    # FIXME(bacongobbler): hard code the desired version for the time being.
-    # A better fix would be to filter for Helm 2 release pages.
-    TAG="v2.16.1"
     # Get tag from release URL
-    # local latest_release_url="https://github.com/helm/helm/releases/latest"
-    # if type "curl" > /dev/null; then
-    #   TAG=$(curl -Ls -o /dev/null -w %{url_effective} $latest_release_url | grep -oE "[^/]+$" )
-    # elif type "wget" > /dev/null; then
-    #   TAG=$(wget $latest_release_url --server-response -O /dev/null 2>&1 | awk '/^  Location: /{DEST=$2} END{ print DEST}' | grep -oE "[^/]+$")
-    # fi
+    local release_url="https://github.com/helm/helm/releases"
+    if type "curl" > /dev/null; then
+
+      TAG=$(curl -Ls $release_url | grep 'href="/helm/helm/releases/tag/v2.' | grep -v no-underline | head -n 1 | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
+    elif type "wget" > /dev/null; then
+      TAG=$(wget $release_url -O - 2>&1 | grep 'href="/helm/helm/releases/tag/v2.' | grep -v no-underline | head -n 1 | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
+    fi
   else
     TAG=$DESIRED_VERSION
   fi

scripts/get-helm-3

@@ -78,11 +78,11 @@ verifySupported() {
 checkDesiredVersion() {
   if [ "x$DESIRED_VERSION" == "x" ]; then
     # Get tag from release URL
-    local latest_release_url="https://github.com/helm/helm/releases/latest"
+    local latest_release_url="https://github.com/helm/helm/releases"
     if type "curl" > /dev/null; then
-      TAG=$(curl -Ls -o /dev/null -w %{url_effective} $latest_release_url | grep -oE "[^/]+$" )
+      TAG=$(curl -Ls $latest_release_url | grep 'href="/helm/helm/releases/tag/v3.' | grep -v no-underline | head -n 1 | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
     elif type "wget" > /dev/null; then
-      TAG=$(wget $latest_release_url --server-response -O /dev/null 2>&1 | awk '/^  Location: /{DEST=$2} END{ print DEST}' | grep -oE "[^/]+$")
+      TAG=$(wget $latest_release_url -O - 2>&1 | grep 'href="/helm/helm/releases/tag/v3.' | grep -v no-underline | head -n 1 | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
     fi
   else
     TAG=$DESIRED_VERSION