add README and some prototype hooks

README

@@ -0,0 +1,18 @@
+This charm deploys a Ceph cluster.
+
+It uses the new-style Ceph deployment as reverse-engineered from the
+Chef cookbook at https://github.com/ceph/ceph-cookbooks
+
+This charm is currently deliberately inflexible and potentially
+destructive.  It is designed to deploy on exactly three machines.
+Each machine will run mon and osd.
+
+The osds use so-called "OSD hotplugging".  ceph-disk-prepare is used
+to create the filesystems with a special GPT partition type.  udev is
+set up to mount such filesystems and start the osd daemons as their
+storage becomes visible to the system (or after "udevadm trigger").
+
+The Chef cookbook above performs some extra steps to generate an OSD
+bootstrapping key and propagate it to the other nodes in the cluster.
+Since all our OSDs run on nodes that also run mon, we don't need this
+and did not implement it.

config.yaml

@@ -4,6 +4,13 @@ options:
     description: |
       fsid of our cluster
   osd-devices:
-    default: ["/dev/sdb", "/dev/sdc", "/dev/sdd", "/dev/sde"]
+    type: string
+    default: /dev/sdb /dev/sdc /dev/sdd /dev/sde
     description: |
       the devices to format and set up as osd volumes
+  monitor-secret:
+    type: string
+    description: |
+      this value will become the "mon." key
+      to generate a suitable value, use
+      ceph-authtool /dev/stdout --name=mon. --gen-key

copyright

@@ -2,3 +2,4 @@ Copyright 2012 Canonical Ltd.
 
 Authors:
 	Paul Collins <paul.collins@canonocal.com>
+	James Page <james.page@canonical.com>

hooks/install

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+set -u
+
+# set up ceph package source
+# XXX make this a charm config option
+cat >/etc/apt/sources.list.d/ceph-brolin.list <<EOF
+deb http://archive.admin.canonical.com/ubuntu precise-cat-ceph main
+EOF
+
+apt-get update
+
+apt-get -y install ceph
+
+# ceph-prepare-disk uses this, is only "suggests" in the package
+apt-get -y install gdisk
+
+exit 0

hooks/mon-relation

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+set -e
+set -u
+

hooks/mon-relation-changed

@@ -0,0 +1 @@
+mon-relation

hooks/mon-relation-departed

@@ -0,0 +1 @@
+mon-relation

hooks/mon-relation-joined

@@ -0,0 +1 @@
+mon-relation

hooks/start

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -e
+set -u
+
+
+for disk in $(config-get osd-devices); do
+    ceph-disk-prepare $disk
+done
+
+udevadm trigger --subsystem-match=block --action=add
+
+exit 0

metadata.yaml

@@ -2,3 +2,6 @@ name: ceph-brolin
 summary: distributed storage
 description: |
   This charm deploys Ceph.
+peers:
+  mon:
+    interface: ceph-brolin