Fix for cloud-sql-proxy.sh - Debian buster repo issue (#1165)

* Fix for bigtable.sh - Debian buster repo issue

* Added missing variables for OS_NAME and deteting dataproc versions

cloud-sql-proxy/cloud-sql-proxy.sh

@@ -21,6 +21,14 @@
 # Do not use "set -x" to avoid printing passwords in clear in the logs
 set -euo pipefail
 
+# Detect dataproc image version from its various names
+if (! test -v DATAPROC_IMAGE_VERSION) && test -v DATAPROC_VERSION; then
+  DATAPROC_IMAGE_VERSION="${DATAPROC_VERSION}"
+fi
+
+readonly OS_NAME=$(lsb_release -is | tr '[:upper:]' '[:lower:]')
+distribution=$(. /etc/os-release;echo $ID$VERSION_ID)
+
 declare -A DEFAULT_DB_PORT=(['MYSQL']='3306' ['POSTGRES']='5432' ['SQLSERVER']='1433')
 declare -A DEFAULT_DB_ADMIN_USER=(['MYSQL']='root' ['POSTGRES']='postgres' ['SQLSERVER']='sqlserver')
 declare -A DEFAULT_DB_PROTO=(['MYSQL']='mysql' ['POSTGRES']='postgresql' ['SQLSERVER']='sqlserver')
@@ -61,6 +69,24 @@ readonly METASTORE_INSTANCE
 ADDITIONAL_INSTANCES="$(/usr/share/google/get_metadata_value ${ADDITIONAL_INSTANCES_KEY} || echo '')"
 readonly ADDITIONAL_INSTANCES
 
+function remove_old_backports {
+  # This script uses 'apt-get update' and is therefore potentially dependent on
+  # backports repositories which have been archived.  In order to mitigate this
+  # problem, we will remove any reference to backports repos older than oldstable
+
+  # https://github.com/GoogleCloudDataproc/initialization-actions/issues/1157
+  oldstable=$(curl -s https://deb.debian.org/debian/dists/oldstable/Release | awk '/^Codename/ {print $2}');
+  stable=$(curl -s https://deb.debian.org/debian/dists/stable/Release | awk '/^Codename/ {print $2}');
+
+  matched_files="$(grep -rsil '\-backports' /etc/apt/sources.list*)"
+  if [[ -n "$matched_files" ]]; then
+    for filename in "$matched_files"; do
+      grep -e "$oldstable-backports" -e "$stable-backports" "$filename" || \
+        sed -i -e 's/^.*-backports.*$//' "$filename"
+    done
+  fi
+}
+
 # Get metastore DB instance type, result be one of MYSQL, POSTGRES, SQLSERVER
 function get_cloudsql_instance_type() {
   local instance=$(echo "$1" | cut -d "," -f 1)
@@ -606,6 +632,11 @@ function main() {
   role="$(/usr/share/google/get_metadata_value attributes/dataproc-role)"
 
   validate
+
+  if [[ ${OS_NAME} == debian ]] && [[ $(echo "${DATAPROC_IMAGE_VERSION} <= 2.1" | bc -l) == 1 ]]; then
+    remove_old_backports
+  fi
+
   if [[ "${role}" == 'Master' ]]; then
     update_master
   else