redirect blob usage on /tmp folder to /var/vcap/data/vblob_tmp

src/services shortlog:

git shortlog 42403b02c5..7ef924042d
Yang Yang (2):
      make vblob service dir configurable
      Merge "make vblob service dir configurable"

andyzh (1):
      correct the max clients formular

src/vblob_src shortlog:

git shortlog 622a1f6840..a12a88fa0c
SonicWang (1):
      fixing pivotal tracker ticket https://www.pivotaltracker.com/projects/254145#!/stories/35010649
      make vblob's usage on /tmp directory configurable

Change-Id: I713b4d0da6bcd28ee893c84ab574d0718346628c

jobs/vblob_node_ng/spec

@@ -8,6 +8,7 @@ templates:
   logrotate.conf.erb: config/logrotate.conf
   vblob_logrotate.cron.erb: config/vblob_logrotate.cron
 
+  create_vblob_tmp_dir.erb: bin/create_vblob_tmp_dir
   warden_ctl: bin/warden_ctl
   warden.yml.erb: config/warden.yml
   vblob_startup.sh: bin/vblob_startup.sh

jobs/vblob_node_ng/templates/create_vblob_tmp_dir.erb

@@ -0,0 +1,107 @@
+#!/bin/sh
+
+<%
+service = "vblob"
+plan_enabled = properties.service_plans && properties.service_plans.send(service.to_sym)
+plan = properties.plan || "free"
+plan_conf = plan_enabled && properties.service_plans.send(service.to_sym).send(plan.to_sym).configuration
+%>
+vblobd_tmp_loop=/var/vcap/data/vblob_tmp_loop
+vblobd_tmp_dir=/var/vcap/data/vblob_tmp
+capacity=<%= plan_enabled && plan_conf.capacity || 75 %>
+vblobd_tmp_size=$(expr ${capacity} \* 50)
+
+log_echo() {
+  echo "`date` $1" >> /var/vcap/sys/log/vblob_node/vblob_create_tmp.log
+}
+
+create_loop_device() {
+  /usr/bin/truncate -s ${vblobd_tmp_size}M ${vblobd_tmp_loop}
+  if [ ! $? -eq 0 ]; then
+    log_echo "ERROR: fail to create the loop device for vblobd tmp directory"
+    rm -rf ${vblobd_tmp_loop}
+    exit 1
+  else
+    chmod 0700 ${vblobd_tmp_loop}
+  fi
+}
+
+current_size=`ls -l ${vblobd_tmp_loop} | cut -d" " -f5`
+expected_size=`expr ${vblobd_tmp_size} \* 1024 \* 1024`
+
+will_create_file=0
+will_setup_loop=0
+will_create_dir=0
+
+if [ ! -f "${vblobd_tmp_loop}" ]; then
+  create_loop_device
+fi
+
+if [ ! "$current_size" = "$expected_size" ] ; then
+  will_create_file=1
+fi
+
+# vblob node will always create a new loop when size does not match or there does not exists a loopfile
+loop_status=`losetup -a | grep "$vblobd_tmp_loop"`
+if [ ! -z "$loop_status" ]; then
+  loop_device=`echo "$loop_status" | cut -d: -f1`
+  if [ -d "$vblobd_tmp_dir" ]; then
+    check_mount=`mount -l | grep "$loop_device" | grep "$vblobd_tmp_dir"`
+    if [ ! -z "$check_mount" ] && [ $will_create_file -eq 0 ]; then
+      chown vcap $vblobd_tmp_dir
+      exit 0
+    fi
+  else
+    will_create_dir=1
+  fi
+else
+  loop_device=`losetup -f`
+  if [ $? -ne 0 ]; then
+    log_echo "ERROR: fail to get one free loop device"
+    exit 1
+  fi
+  will_setup_loop=1
+  if [ -d "$vblobd_tmp_dir" ]; then
+    will_create_dir=1
+  fi
+fi
+
+if [ $will_create_file -eq 1 ]; then
+  umount -d $vblobd_tmp_dir
+  rm -rf $vblobd_tmp_dir
+  losetup -d $loop_device
+  rm -rf $vblobd_tmp_loop
+
+  create_loop_device
+
+  will_setup_loop=1
+  will_create_dir=1
+fi
+
+if [ $will_setup_loop -eq 1 ]; then
+  losetup $loop_device $vblobd_tmp_loop
+  if [ $? -ne 0 ]; then
+    log_echo "ERROR: fail to bind the loop device with the loop file"
+    exit 1
+  fi
+  mke2fs -t ext4 $loop_device
+  if [ $? -ne 0 ]; then
+    log_echo "ERROR: fail to make ext4 filesystem"
+    exit 1
+  fi
+fi
+
+if [ $will_create_dir -eq 1 ]; then
+  if [ -d $vblobd_tmp_dir ]; then
+    umount -d $vblobd_tmp_dir
+  fi
+  mkdir -p $vblobd_tmp_dir
+  mount -t ext4 $loop_device $vblobd_tmp_dir
+  if [ $? -ne 0 ]; then
+    log_echo "ERROR: fail to mount $loop_device to $vblobd_tmp_dir"
+    exit 1
+  fi
+fi
+
+chown vcap $vblobd_tmp_dir
+exit 0

jobs/vblob_node_ng/templates/vblob_node.yml.erb

@@ -33,6 +33,7 @@ default_version: <%= "'#{default_version}'"%>
 nodejs_path: /var/vcap/packages/node/bin/node
 vblobd_path: /var/vcap/packages/vblob
 vblobd_auth: <%= node.vblobd_auth || "disabled" %>
+vblobd_tmp_dir: /var/vcap/data/vblob_tmp
 vblobd_obj_limit: <%= plan_enabled && plan_conf.vblobd_obj_limit || 32768 %>
 port_range:
   first: 45001

jobs/vblob_node_ng/templates/vblob_node_ctl

@@ -41,6 +41,13 @@ case $1 in
     mkdir -p $SERV_LOG_DIR
 
     echo $$ > $PIDFILE
+
+    /var/vcap/jobs/vblob_node_ng/bin/create_vblob_tmp_dir
+    if [ $? -ne 0 ]; then
+      echo "failed to create vblob tmp directory"
+      exit 1
+    fi
+
     # Enable log aggregation
     <% if properties.syslog_aggregator %>
     /var/vcap/packages/syslog_aggregator/setup_syslog_forwarder.sh $CONF_DIR