From 58c755cf4c3219393266c0f4e8494cd447c844c9 Mon Sep 17 00:00:00 2001
From: Steve Kowalik <steven@wedontsleep.org>
Date: Mon, 20 Jan 2014 23:00:21 +1100
Subject: [PATCH] Create a new baremetal element

Rather than using a script to mount the image using nbd to extract the
kernel and ramdisk, make a new element called baremetal, which contains
a cleanup.d script that will copy them out to <image name>.{vmlinuz,initrd}.

Closes-Bug: 1224669
Change-Id: I8f3569aa12148d18b1c8242b6fbbd8857894b26f
---
 .gitignore                                    |  2 +
 README.md                                     |  5 +-
 bin/disk-image-get-kernel                     |  3 +
 elements/baremetal/README.md                  |  4 ++
 .../cleanup.d/99-extract-kernel-and-ramdisk   | 58 +++++++++++++++++++
 5 files changed, 70 insertions(+), 2 deletions(-)
 create mode 100644 elements/baremetal/README.md
 create mode 100755 elements/baremetal/cleanup.d/99-extract-kernel-and-ramdisk

diff --git a/.gitignore b/.gitignore
index 8f923687d..6cb3b252d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,8 @@
 dist
 *.qcow2
 *.raw
+*.initrd
+*.vmlinuz
 build
 AUTHORS
 ChangeLog
diff --git a/README.md b/README.md
index 3628da561..c9ab7a717 100644
--- a/README.md
+++ b/README.md
@@ -31,8 +31,9 @@ What tools are there?
 
     ramdisk-image-create -o deploy.ramdisk deploy
 
-* disk-image-get-kernel filename : Extract the appropriate kernel and ramdisk
-  to use when doing PXE boot using filename as the image for a machine.
+* disk-image-get-kernel filename : **DEPRECATED** Extract the appropriate
+  kernel and ramdisk to use when doing PXE boot using filename as the image
+  for a machine. Consider using the `baremetal` element, rather than this tool.
 
 * elements can be found in the top level elements directory.
 
diff --git a/bin/disk-image-get-kernel b/bin/disk-image-get-kernel
index 7d7eac0f3..6522d8dc8 100755
--- a/bin/disk-image-get-kernel
+++ b/bin/disk-image-get-kernel
@@ -41,6 +41,9 @@ function show_options () {
     exit 0
 }
 
+echo 'DEPRECATED: Please consider using the `baremetal` element.'
+echo
+
 TEMP=`getopt -o hd:i:o:x -n $SCRIPTNAME -- "$@"`
 if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
 
diff --git a/elements/baremetal/README.md b/elements/baremetal/README.md
new file mode 100644
index 000000000..c94fd3754
--- /dev/null
+++ b/elements/baremetal/README.md
@@ -0,0 +1,4 @@
+This is the baremetal (IE: real hardware) element.
+
+Currently, this element will extract out the kernel and initial ramdisk of
+the built image.
diff --git a/elements/baremetal/cleanup.d/99-extract-kernel-and-ramdisk b/elements/baremetal/cleanup.d/99-extract-kernel-and-ramdisk
new file mode 100755
index 000000000..8d2a2b15f
--- /dev/null
+++ b/elements/baremetal/cleanup.d/99-extract-kernel-and-ramdisk
@@ -0,0 +1,58 @@
+#!/bin/bash
+#
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+set -e
+
+[ -n "$TARGET_ROOT" ]
+
+# Dig up the initrd and kernel to use.
+BOOTDIR="$TARGET_ROOT/boot"
+KERNEL=
+RAMDISK=
+if [ -f $TARGET_ROOT/etc/redhat-release ]; then
+
+    # Prioritize PAE if present
+    KERNEL=$(ls -1rv $BOOTDIR/vmlinuz*  | grep PAE | grep -v debug | head -1)
+    if [ ! $KERNEL ]; then
+        KERNEL=$(ls -1rv $BOOTDIR/vmlinuz* | grep -v debug | head -1)
+        if [ ! $KERNEL ]; then
+            echo "No suitable kernel found."
+            exit 1
+        fi
+    fi
+
+    KERNEL=$(basename $KERNEL)
+    KERNEL_VERSION=`echo $KERNEL | sed 's/vmlinuz-//g'`
+
+    RAMDISK=$(basename `ls $BOOTDIR/initramfs-$KERNEL_VERSION.img`)
+    if [ ! $RAMDISK ]; then
+        echo "Can't find an initramfs for the $KERNEL_VERSION version of the kernel."
+        exit 1
+    fi
+
+elif [ -f $TARGET_ROOT/etc/debian_version ]; then
+    KERNEL=$(basename `ls -1rv $BOOTDIR/vmlinuz*generic | head -1`)
+    RAMDISK=$(basename `ls -1rv $BOOTDIR/initrd*generic | head -1`)
+else
+    echo "ERROR: Unable to detect operating system"
+    exit 1
+fi
+
+sudo cp $BOOTDIR/$KERNEL ${IMAGE_NAME}.vmlinuz
+sudo cp $BOOTDIR/$RAMDISK ${IMAGE_NAME}.initrd
+sudo chmod a+r ${IMAGE_NAME}.vmlinuz
+sudo chmod a+r ${IMAGE_NAME}.initrd