Add script to refresh testnet nodes

ci/refresh-testnet.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+#
+# Refreshes the Solana software running on the Testnet full nodes
+#
+# This script must be run by a user/machine that has successfully authenticated
+# with GCP and has sufficient permission.
+#
+
+if [[ -z $SOLANA_METRICS_CONFIG ]]; then
+  echo Error: SOLANA_METRICS_CONFIG environment variable is unset
+  exit 1
+fi
+
+# Default to --edge channel.  To select the beta channel:
+#   export SOLANA_METRICS_CONFIG=--beta
+if [[ -z $SOLANA_SNAP_CHANNEL ]]; then
+  SOLANA_SNAP_CHANNEL=--edge
+fi
+
+vmlist=(testnet-solana-com:us-west1-b) # Leader is hard coded as the first entry
+
+echo "--- Available validators"
+gcloud compute instances list --filter="labels.testnet-mode=validator"
+while read -r vmName vmZone status; do
+  if [[ $status != RUNNING ]]; then
+    echo "Warning: $vmName is not RUNNING, ignoring it."
+    continue
+  fi
+  vmlist+=("$vmName:$vmZone")
+done < <(gcloud compute instances list --filter="labels.testnet-mode=validator" --format 'value(name,zone,status)')
+
+mode=leader+drone
+for info in "${vmlist[@]}"; do
+  vmName=${info%:*}
+  vmZone=${info#*:}
+
+  echo "--- Processing $vmName in zone $vmZone as $mode"
+  cat > autogen-refresh.sh <<EOF
+  set -x
+  sudo snap remove solana
+  sudo snap install solana $SOLANA_SNAP_CHANNEL --devmode
+  sudo snap set solana mode=$mode metrics-config=$SOLANA_METRICS_CONFIG
+  snap info solana
+  sudo snap logs solana -n200
+EOF
+  (
+    set -x
+    gcloud compute scp --zone "$vmZone" autogen-refresh.sh "$vmName":
+    gcloud compute ssh "$vmName" --zone "$vmZone" \
+      --ssh-flag="-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -t" \
+      --command="bash ./autogen-refresh.sh"
+  )
+  mode=validator
+done
+
+echo "--- done"
+exit 0