[k8s] Nimbus backward compatibility (#4400)

* Add nimbus backward compatibility

* add uv backcompat

* add uv backcompat

* add uv backcompat

* lint

* merge

* merge

sky/templates/kubernetes-ray.yml.j2

@@ -327,6 +327,13 @@ available_node_types:
           command: ["/bin/bash", "-c", "--"]
           args: 
             - |
+              # For backwards compatibility, we put a marker file in the pod
+              # to indicate that the pod is running with the changes introduced 
+              # in project nimbus: https://github.com/skypilot-org/skypilot/pull/4393
+              # TODO: Remove this marker file and it's usage in setup_commands
+              # after v0.10.0 release.
+              touch /tmp/skypilot_is_nimbus
+
               # Helper function to conditionally use sudo
               # TODO(zhwu): consolidate the two prefix_cmd and sudo replacements
               prefix_cmd() { if [ $(id -u) -ne 0 ]; then echo "sudo"; else echo ""; fi; }
@@ -575,9 +582,12 @@ setup_commands:
     STEPS=("apt-ssh-setup" "runtime-setup" "env-setup")
     start_epoch=$(date +%s);
     echo "=== Logs for asynchronous ray and skypilot installation ===";
-    [ -f /tmp/ray_skypilot_installation_complete ] && cat /tmp/${STEPS[1]}.log || 
-    { tail -f -n +1 /tmp/${STEPS[1]}.log & TAIL_PID=$!; echo "Tail PID: $TAIL_PID"; until [ -f /tmp/ray_skypilot_installation_complete ]; do sleep 0.5; done; kill $TAIL_PID || true; };
-    [ -f /tmp/${STEPS[1]}.failed ] && { echo "Error: ${STEPS[1]} failed. Exiting."; exit 1; } || true;
+    if [ -f /tmp/skypilot_is_nimbus ]; then
+      echo "=== Logs for asynchronous ray and skypilot installation ===";
+      [ -f /tmp/ray_skypilot_installation_complete ] && cat /tmp/${STEPS[1]}.log || 
+      { tail -f -n +1 /tmp/${STEPS[1]}.log & TAIL_PID=$!; echo "Tail PID: $TAIL_PID"; until [ -f /tmp/ray_skypilot_installation_complete ]; do sleep 0.5; done; kill $TAIL_PID || true; };
+      [ -f /tmp/${STEPS[1]}.failed ] && { echo "Error: ${STEPS[1]} failed. Exiting."; exit 1; } || true;
+    fi
     end_epoch=$(date +%s);
     echo "=== Ray and skypilot dependencies installation completed in $(($end_epoch - $start_epoch)) secs ===";
     start_epoch=$(date +%s);