Add local cassandra charm from Tony Liu's machine

Change-Id: I56478233f7498861f95a0c12be983f9a1307853e
Signed-off-by: Stuart Mackie <wsmackie@juniper.net>

1 files changed, 220 insertions, 0 deletions

diff --git a/charms/trusty/cassandra/scripts/volume-common.sh b/charms/trusty/cassandra/scripts/volume-common.sh
new file mode 100755
index 0000000..3af8ff1
--- /dev/null
+++ b/charms/trusty/cassandra/scripts/volume-common.sh
@@ -0,0 +1,220 @@
+#!/bin/bash
+# Author: JuanJo Ciarlante <jjo@canonical.com>
+# Copyright: Canonical Ltd. 2012
+# License: GPLv2
+#
+# juju storage common shell library
+# 
+
+#------------------------------
+# Returns a mount point from passed vol-id, e.g. /srv/juju/vol-000012345
+#
+# @param  $1             volume id
+# @echoes mntpoint-path  eg /srv/juju/vol-000012345
+#------------------------------
+_mntpoint_from_volid() {
+  local volid=${1?missing volid}
+  [[ ${volid} != "" ]] && echo /srv/juju/${volid} || echo ""
+}
+
+
+#------------------------------
+# Assert that passed mount points hold different filesystems
+#
+# @param  $1     mntpoint1
+# @param  $2     mntpoint2
+# @return  0     different FS
+#          1     same FS
+#------------------------------
+_assert_diff_fs() {
+  local mnt1="${1:?missing mntpoint1}"
+  local mnt2="${2:?missing mntpoint2}"
+  local fsid1 fsid2
+  fsid1=$(stat --file-system -c '%i' "${mnt1}" 2>/dev/null)
+  fsid2=$(stat --file-system -c '%i' "${mnt2}" 2>/dev/null)
+  [[ ${fsid1} != ${fsid2} ]]
+  return $?
+}
+
+#------------------------------
+# Initialize volume (sfdisk, mkfs.ext4) IFF NOT already, mount it at
+# /srv/juju/<volume-id>
+#
+# @param  $1 volume-id, can be any arbitrary string, better if
+#            equal to EC2/OS vol-id name (just for consistency)
+# @return  0 success
+#          1 nil volid/etc
+#          2 error while handling the device (non-block device, sfdisk error, etc)
+#------------------------------
+volume_init_and_mount() {
+  ## Find 1st unused device (reverse sort /dev/vdX)
+  local volid=${1:?missing volid}
+  local dev_regexp
+  local dev found_dev=
+  local label="${volid}"
+  local func=${FUNCNAME[0]}
+  dev_regexp=$(config-get volume-dev-regexp) || return 1
+  mntpoint=$(_mntpoint_from_volid ${volid})
+
+  [[ -z ${mntpoint} ]] && return 1
+  if mount | egrep -qw "${mntpoint}";then
+    _assert_diff_fs "/" "${mntpoint}" || {
+       juju-log "ERROR: returning from ${func} with '${mntpoint}' still at '/' filesystem"
+       return 1
+    }
+    juju-log "NOTICE: mntpoint=${mntpoint} already mounted, skipping volume_init_and_mount"
+    return 0
+  fi
+
+  # Sanitize
+  case "${dev_regexp?}" in
+    # Careful: this is glob matching against an regexp -
+    # quite narrowed
+    /dev/*|/dev/disk/by-*)
+      ;; ## Ok
+    *)
+      juju-log "ERROR: invalid 'volume-dev-regexp' specified"
+      return 1
+      ;;
+  esac
+
+  # Assume udev will create only existing devices
+  for dev in $(ls -rd1 /dev/* | egrep "${dev_regexp}" | egrep -v "[1-9]$" 2>/dev/null);do
+    ## Check it's not already mounted
+    mount | egrep -q "${dev}[1-9]?" || { found_dev=${dev}; break;}
+  done
+  [[ -n "${found_dev}" ]] || {
+    juju-log "ERROR: ${func}: coult not find an unused device for regexp: ${dev_regexp}"
+    return 1
+  }
+  partition1_dev=${found_dev}1
+
+  juju-log "INFO: ${func}: found_dev=${found_dev}"
+  [[ -b ${found_dev?}  ]] || {
+    juju-log "ERROR: ${func}: ${found_dev} is not a blockdevice"
+    return 2
+  }
+
+  # Run next set of "dangerous" commands as 'set -e', in a subshell
+  (
+  set -e
+  # Re-read partition - will fail if already in use
+  blockdev --rereadpt ${found_dev}
+
+  # IFF not present, create partition with full disk
+  if [[ -b ${partition1_dev?} ]];then
+    juju-log "INFO: ${func}: ${partition1_dev} already present - skipping sfdisk."
+  else
+    juju-log "NOTICE: ${func}: ${partition1_dev} not present at ${found_dev}, running: sfdisk ${found_dev} ..."
+    # Format partition1_dev as max sized
+    echo ",+," | sfdisk ${found_dev}
+  fi
+
+  # Create an ext4 filesystem if NOT already present
+  # use e.g. LABEl=vol-000012345
+  if file -s ${partition1_dev} | egrep -q ext4 ; then
+    juju-log "INFO: ${func}: ${partition1_dev} already formatted as ext4 - skipping mkfs.ext4."
+    ## Check e2label - log if it has changed (e.g. already used / initialized with a diff label)
+    local curr_label=$(e2label "${partition1_dev}")
+    if [[ ${curr_label} != ${label} ]]; then
+      juju-log "WARNING: ${func}: ${partition1_dev} had label=${curr_label}, overwritting with label=${label}"
+      e2label ${partition1_dev} "${label}"
+    fi
+  else
+    juju-log "NOTICE: ${func}: running: mkfs.ext4 -L ${label} ${partition1_dev}"
+    mkfs.ext4 -L "${label}" ${partition1_dev}
+  fi
+
+  # Mount it at e.g. /srv/juju/vol-000012345
+  [[ -d "${mntpoint}" ]] || mkdir -p "${mntpoint}"
+  mount | fgrep -wq "${partition1_dev}" || {
+    local files_below_mntpoint="$(cd ${mntpoint}; ls -1A |wc -l )"
+    if [[ ${files_below_mntpoint} -ne 0 ]]; then
+      juju-log "ERROR: *not* doing 'mount "${partition1_dev}" "${mntpoint}"' because there are already ${files_below_mntpoint} files/dirs beneath '${mntpoint}'"
+      exit 1
+    fi
+    ## should always fsck before mounting (e.g. fsck after max time (-i) / max mounts (-c) )
+    fsck "${partition1_dev}"
+    mount "${partition1_dev}" "${mntpoint}"
+    juju-log "INFO: ${func}: mounted as: '$(mount | fgrep -w ${partition1_dev})'"
+  }
+
+  # Add it to fstab is not already there
+  fgrep -wq "LABEL=${label}" /etc/fstab || {
+    echo "LABEL=${label}    ${mntpoint}    ext4    defaults,nobootwait,comment=${volid}" | tee -a /etc/fstab
+    juju-log "INFO: ${func}: LABEL=${label} added to /etc/fstab"
+  }
+  )
+  # Final assertion: mounted filesystem id is different from '/' (effectively mounted)
+  _assert_diff_fs "/" "${mntpoint}" || {
+     juju-log "ERROR: returning from ${func} with '${mntpoint}' still at '/' filesystem (couldn't mount new volume)"
+     ## try to rmdir mntpoint directory - should not be 'mistakenly' used
+     rmdir ${mntpoint}
+     return 1
+  }
+  return $?
+}
+
+#------------------------------
+# Get volume-id from juju config "volume-map" dictionary as
+#     volume-map[JUJU_UNIT_NAME]
+# @return  0 if volume-map value found ( does echo volid or ""), else:
+#          1 if not found or None
+#
+#------------------------------
+volume_get_volid_from_volume_map() {
+  local volid=$(config-get "volume-map"|python -c$'import sys;import os;from yaml import load;from itertools import chain; volume_map = load(sys.stdin)\nif volume_map: print volume_map.get(os.environ["JUJU_UNIT_NAME"])')
+  [[ $volid == None ]] && return 1
+  echo "$volid"
+}
+
+# Returns true if permanent storage (considers --ephemeral)
+# @returns  0 if volid set and not --ephemeral, else:
+#           1 
+volume_is_permanent() {
+  local volid=${1:?missing volid}
+  [[ -n ${volid} && ${volid} != --ephemeral ]] && return 0 || return 1
+}
+volume_mount_point_from_volid(){
+  local volid=${1:?missing volid}
+  if volume_is_permanent "${volid}";then
+	  echo "/srv/juju/${volid}"
+    return 0
+  else
+    return 1
+  fi
+}
+# Do we have a valid storage state?
+# @returns  0 does echo $volid (can be "--ephemeral")
+#           1 config state is invalid - we should not serve
+volume_get_volume_id() {
+  local ephemeral_storage
+  local volid
+  ephemeral_storage=$(config-get volume-ephemeral-storage) || return 1
+  volid=$(volume_get_volid_from_volume_map) || return 1
+  if [[ $ephemeral_storage == True ]];then
+    # Ephemeral -> should not have a valid volid
+    if [[ $volid != "" ]];then
+        juju-log "ERROR: volume-ephemeral-storage is True, but $JUJU_UNIT_NAME maps to volid=${volid}"
+        return 1
+    fi
+  else
+    # Durable (not ephemeral) -> must have a valid volid for this unit
+     if [[ $volid == "" ]];then
+        juju-log "ERROR: volume-ephemeral-storage is False, but no volid found for: $JUJU_UNIT_NAME"
+        return 1
+     fi
+  fi
+  echo "$volid"
+  return 0
+}
+
+case "$1" in
+  ## allow non SHELL scripts to call helper functions
+  call)
+    : ${JUJU_UNIT_NAME?} ## Must be called in juju environment
+    shift;
+    function="${1:?usage: ${0##*/} call function arg1 arg2 ...}"
+    shift;
+    ${function} "$@" && exit 0 || exit 1
+esac