AGENT-455: Check registry and rendezvous host access at startup

Update the interactive console service to have it check the current
host can access the release image and rendezvous host. Display
this connectivity information to the user before prompting to run
the network configuration tui.

If there is connectivity, then the prompt times out after 60s and
the automation flow is allowed to continue.

If there is a connectivity issue, then the network configuration
tui will be executed to allow users to update. The tui, however,
has not been  integrated with the interactive console service, so
in the meantime, there is a 60s sleep in place of executing the tui.
This will be changed in a future patch.

Depends on: #6756

Signed-off-by: Richard Su <rwsu@redhat.com>

data/data/agent/files/etc/assisted/agent-installer.env.template

@@ -8,3 +8,4 @@
 # ASSISTED_SERVICE_HOST must be updated.
 #   
 NODE_ZERO_IP={{.NodeZeroIP}}
+RELEASE_IMAGE={{.ReleaseImage}}

data/data/agent/files/usr/local/bin/agent-interactive-console.sh

@@ -1,10 +1,86 @@
 #!/bin/bash
 
-echo "agent-interactive-console start"
-systemctl status pre-network-manager-config.service
+# shellcheck disable=SC1091
+source /etc/assisted/agent-installer.env
 
-# TODO: Execute tui and remove sleep
-echo "sleeping 60 seconds"
-sleep 60
+function has_registry_connectivity() {
+    (>&2 echo "INFO: Checking OpenShift release image at $RELEASE_IMAGE is pullable.")
+    (>&2 podman pull "$RELEASE_IMAGE")
+    registry_check_status_code=$?
+    if [[ "$registry_check_status_code" -ne 0 ]]; then
+      (>&2 echo "WARNING: Unable to pull release image.")
+      echo 0
+    else
+      (>&2 echo "INFO: Release image is pullable.")
+      echo 1
+    fi
+}
 
-echo "agent-interactive-console end"
+function has_rendezvous_host_connectivity() {
+    if (>&2 ping -c 4 "$NODE_ZERO_IP"); then
+	  (>&2 echo "INFO: Successfully pinged rendezvous host at ${NODE_ZERO_IP}.")
+	  echo 1
+	else
+	  (>&2 echo "WARNING: Failed to ping rendezvous host at ${NODE_ZERO_IP}.")
+	  echo 0
+	fi
+}
+
+function has_connectivity() {
+    (>&2 echo "INFO: Checking connectivity.")
+    problem_found=0
+    if [[ $(has_registry_connectivity) -eq 0 ]]; then
+      problem_found=1
+    fi
+    if [[ $(has_rendezvous_host_connectivity) -eq 0 ]]; then
+      problem_found=1
+    fi
+
+    if [[ $problem_found -eq 1 ]]; then
+      (>&2 echo "WARNING: Connectivity problem found.")
+      echo 0
+    else
+      (>&2 echo "INFO: Host has connectivity to release image and rendezvous host.")
+      echo 1
+    fi
+}
+
+should_configure=1
+while [ $should_configure -eq 1 ]; do
+  while true; do
+    if [[ $(has_connectivity) -eq 1 ]]; then
+	    should_configure=0
+    fi
+    if [ $should_configure -eq 1 ]; then
+      # Case 1: Connectivity checks failed, run the tui to allow user to update
+      # network configuration.
+      #
+      # TODO: execute tui and remove sleep. If the tui does connectivity checks,
+      # perhaps we can exit from the loop upon the tui exiting. For now, we always
+      # exit to allow the automated flow to continue to preserve the current
+      # behavior.
+      #/usr/local/bin/agent-tui
+      echo "TODO: execute agent-tui and remove 60s sleep"
+      sleep 60
+      # break here does not work, need exit
+      exit 0
+    else
+      # Case 2: Connectivity checks passed. Give users 60s to use the tui
+      # if they would like to make a change. After 60s, the prompt disappears
+      # and automated flow will start.
+      echo "INFO: Boot will continue in 60s if the next prompt goes unanswered."
+      read -t 60 -e -p "Do you wish to enter NetworkManager terminal user interface to change the network configuration? (Y)es/(N)o: " ANSWER
+      if [[ "$ANSWER" =~ ^[Yy](es)?$ ]]; then
+	      # TODO: execute tui
+        #/usr/local/bin/agent-tui
+        # TODO: If the tui does connectivity checks, then we may not need to force
+        # this script to do its own connectivty checks again. The next line may be
+        # removed and can break from the loop.
+        should_configure=1
+      else
+        # The prompt timed out. Proceed with automated flow.
+        break
+      fi
+    fi
+  done
+done