From edae355cd2b476f93a85ef148479feda8c9ccce8 Mon Sep 17 00:00:00 2001
From: niusmallnan <niusmallnan@gmail.com>
Date: Mon, 6 Aug 2018 14:11:38 +0800
Subject: [PATCH] Avoid kernel too old error when building ROS

---
 .drone.yml        |  2 +-
 Dockerfile.dapper |  2 +-
 scripts/build     | 15 +++++++++++++++
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/.drone.yml b/.drone.yml
index 67720304..a9905982 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -5,4 +5,4 @@ pipeline:
     volumes:
     - /var/run/docker.sock:/var/run/docker.sock
     commands:
-    - dapper ci
+    - KERNEL_CHECK=0 dapper ci
diff --git a/Dockerfile.dapper b/Dockerfile.dapper
index 51c980d5..7302e78d 100644
--- a/Dockerfile.dapper
+++ b/Dockerfile.dapper
@@ -40,7 +40,7 @@ RUN echo "Acquire::http { Proxy \"$APTPROXY\"; };" >> /etc/apt/apt.conf.d/01prox
 
 ########## Dapper Configuration #####################
 
-ENV DAPPER_ENV VERSION DEV_BUILD RUNTEST DEBUG APTPROXY ENGINE_REGISTRY_MIRROR INTEGRATION_TESTS
+ENV DAPPER_ENV VERSION DEV_BUILD RUNTEST DEBUG APTPROXY ENGINE_REGISTRY_MIRROR INTEGRATION_TESTS KERNEL_CHECK
 ENV DAPPER_DOCKER_SOCKET true
 ENV DAPPER_SOURCE /go/src/github.com/rancher/os
 ENV DAPPER_OUTPUT ./bin ./dist ./build/initrd ./build/kernel
diff --git a/scripts/build b/scripts/build
index 118906ee..166a2e41 100755
--- a/scripts/build
+++ b/scripts/build
@@ -1,6 +1,21 @@
 #!/bin/bash
 set -e
 
+version_gt() {
+    test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1";
+}
+
+
+if [ "$KERNEL_CHECK" != "0" ]; then
+    echo "Host Kernel: $(uname -r)"
+    echo "RancherOS Kernel: $KERNEL_VERSION"
+
+    if ! version_gt $(uname -r) $KERNEL_VERSION; then
+        echo "Your host kernel must be greater than RancherOS KERNEL_VERSION"
+        exit 1
+    fi
+fi
+
 echo -------------------------./build-target
 $(dirname $0)/build-target
 echo -------------------------./build-host