update kernel builder for linux next

Signed-off-by: Jessica Frazelle <acidburn@docker.com>

kernel-builder/Dockerfile

@@ -8,6 +8,7 @@ RUN apt-get update && apt-get install -y \
 	kernel-package \
 	make \
 	libncurses5-dev \
+	libssl-dev \
 	--no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 

kernel-builder/install_kernel

@@ -1,12 +1,49 @@
 #!/bin/bash
 set -e
 
+linux_next(){
+	(
+	cd /usr/src
+
+	# check if we already have the source checked out
+	if [[ -d linux ]]; then
+		cd linux
+
+		git checkout master
+
+		git remote update
+	else
+		# clone the source files
+		git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
+
+		# add the linux-next remote
+		cd linux
+		git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
+
+		# fetch linux-next and tags
+		git fetch linux-next
+		git fetch --tags linux-next
+	fi
+
+	git checkout -b next-$(date +%Y%m%d) next-$(date +%Y%m%d)
+	
+	if [[ ! -f .config ]] && [[ -f ../config ]]; then
+		cp ../config .config
+	fi
+
+	nice -19 make -j$JOBS KDEB_PKGVERSION=$PKGVERSION INSTALL_MOD_STRIP=1 deb-pkg
+	)
+}
+
 install_kernel(){
 	local VERSION=$1
 
 	if [[ -z $VERSION ]]; then
 		echo "Please specify a kernel version."
 		exit 1
+	elif [[ "$VERSION" == "next" ]]; then
+		linux_next
+		exit 0
 	fi
 
 	local MAJOR_VERSION=${VERSION:0:1}