Fix nexus-ui runAsNonRoot crash; prompt for the Istio hostname on install

MosipNexus/deploy/nexus-ui/install.sh

@@ -13,19 +13,68 @@
 ##      1.0.0). A routine redeploy always gets exactly this version, not
 ##      whatever happens to be newest — bump it deliberately when you
 ##      actually want to upgrade, after checking the new chart's changelog.
+##
+## Hostname: prompted interactively every run — routing is always Istio-based
+## (routing.mode: istio), so this always sets routing.istio.hosts[0], never
+## routing.ingress.host.
 
 if [ $# -ge 1 ] && [ -n "$1" ] ; then
   export KUBECONFIG=$1
 fi
 
-NS=mosip-nexus
+NS=nexus
 RELEASE=nexus-ui
 CHART_REPO=mosip
 CHART_REPO_URL=https://mosip.github.io/mosip-helm
 CHART_NAME=nexus-ui
 CHART_VERSION="${CHART_VERSION:-1.0.0}"
 ROLLOUT_TIMEOUT="${ROLLOUT_TIMEOUT:-10m}"
 
+function prompt_hostname() {
+  if [ ! -t 0 ] ; then
+    echo "ERROR: this shell isn't interactive — can't prompt for the UI hostname." >&2
+    echo "Run this script interactively so it can ask for it." >&2
+    return 1
+  fi
+
+  # --ignore-not-found distinguishes "no existing VirtualService" (empty
+  # output, exit 0 — fresh install) from a real kubectl error (Forbidden,
+  # timeout, wrong kubeconfig, ...), same pattern as nexus-server's
+  # postgres-data PVC check.
+  local current_host
+  if ! current_host=$(kubectl -n "$NS" get virtualservice nexus-ui --ignore-not-found -o jsonpath='{.spec.hosts[0]}') ; then
+    echo "ERROR: Could not determine the currently deployed hostname" >&2
+    echo "(kubectl error above) — refusing to guess. Fix cluster access and retry." >&2
+    return 1
+  fi
+  if [ -n "$current_host" ] ; then
+    echo "Currently deployed hostname: $current_host"
+  else
+    echo "No existing nexus-ui VirtualService found — this looks like a fresh install."
+  fi
+
+  local hostname=""
+  while [ -z "$hostname" ] ; do
+    if ! read -r -p "Enter the hostname for accessing the UI (routing.istio.hosts[0]): " hostname ; then
+      echo "ERROR: failed to read hostname input (EOF or interrupted)." >&2
+      return 1
+    fi
+  done
+
+  if [ -n "$current_host" ] && [ "$hostname" != "$current_host" ] ; then
+    echo "WARNING: this changes the hostname from '$current_host' to '$hostname'." >&2
+    echo "Make sure DNS/TLS for '$hostname' is already set up before confirming." >&2
+    local confirm=""
+    read -r -p "Type YES to confirm this hostname change: " confirm
+    if [ "$confirm" != "YES" ] ; then
+      echo "Aborted. Re-run and enter '$current_host' to keep the current hostname." >&2
+      return 1
+    fi
+  fi
+
+  UI_HOSTNAME="$hostname"
+}
+
 function installing_nexus_ui() {
   if ! kubectl -n "$NS" get svc nexus-api >/dev/null 2>&1 ; then
     echo "ERROR: Service 'nexus-api' not found in namespace '$NS'."
@@ -36,6 +85,8 @@ function installing_nexus_ui() {
   echo "Creating $NS namespace (no-op if it already exists)"
   kubectl create ns "$NS" --dry-run=client -o yaml | kubectl apply -f -
 
+  prompt_hostname
+
   echo "Adding/updating the '$CHART_REPO' Helm repo ($CHART_REPO_URL)"
   # --force-update + no `|| true`: if a "$CHART_REPO" entry already exists
   # pointing at a DIFFERENT url, silently ignoring the add failure would
@@ -48,7 +99,9 @@ function installing_nexus_ui() {
 
   echo "Installing/upgrading $RELEASE from $CHART_REPO/$CHART_NAME @ $CHART_VERSION (published chart)"
   helm -n "$NS" upgrade --install "$RELEASE" "$CHART_REPO/$CHART_NAME" \
-    --version "$CHART_VERSION" -f my-values.yaml --wait
+    --version "$CHART_VERSION" -f my-values.yaml \
+    --set routing.istio.hosts[0]="$UI_HOSTNAME" \
+    --wait
 
   kubectl -n "$NS" rollout status deployment/nexus-ui --timeout="$ROLLOUT_TIMEOUT"
   echo "Installed $RELEASE"

MosipNexus/helm/nexus-ui/values.yaml

@@ -143,6 +143,13 @@ podSecurityContext:
 containerSecurityContext:
   enabled: true
   runAsNonRoot: true
+  # nginx:1.27-alpine's Dockerfile USER directive is "nginx" (a name, not a
+  # numeric UID) — kubelet can't statically verify that satisfies
+  # runAsNonRoot without an explicit runAsUser, and refuses to start the
+  # container ("cannot verify user is non-root") without this. Confirmed via
+  # `id nginx` inside the actual image: uid=101(nginx) gid=101(nginx) —
+  # matches podSecurityContext.fsGroup below.
+  runAsUser: 101
   allowPrivilegeEscalation: false
   readOnlyRootFilesystem: true
   capabilities: