X-Git-Url: http://xvm.mit.edu/gitweb/invirt/packages/invirt-remote.git/blobdiff_plain/7339891c2377d09611ba01b2f2496ae3aa151329..967a3566b99b42fe71a52c2b6e5be99bfb24718f:/host/usr/sbin/invirt-availability

diff --git a/host/usr/sbin/invirt-availability b/host/usr/sbin/invirt-availability
index 93ef381..1dcf9c8 100644
--- a/host/usr/sbin/invirt-availability
+++ b/host/usr/sbin/invirt-availability
@@ -6,20 +6,31 @@ Gathers availability data for the VM host it's running on.
 from subprocess import PIPE, Popen, call
 import sys
 import yaml
+import os
 
-# return the amount of memory in kilobytes represented by s
+# return the amount of memory in kibibytes represented by s
 def parseUnits(s):
     num, unit = s.split(' ')
-    return int(num) * {'kb':1, 'mb':1024}[unit.lower()]
+    assert unit == 'kB', "unexpected unit"
+    return int(num)
 
 def main(argv):
     """
     Calculate the amount of memory available for new VMs
-    The numbers returned by xm info and xm info -c are in MB
-    The numbers in /proc/xen/balloon have nice units
-    All math is done in kilobytes for consistency
-    Output is in MB
+    The numbers returned by xm info and xm info -c are in MiB
+    The numbers in /proc/xen/balloon are in KiB
+    All math is done in kibibytes for consistency
+    Output is in MiB
+
+    Bail if /etc/invirt/nocreate exists
     """
+    try:
+        os.stat('/etc/invirt/nocreate')
+        print 0
+        return 0
+    except OSError:
+        pass
+
     p = Popen(['/usr/sbin/xm', 'info'], stdout=PIPE)
     output = p.communicate()[0]
     if p.returncode != 0:
@@ -40,7 +51,7 @@ def main(argv):
                            % ('/usr/sbin/xm info -c', p.returncode)) 
     xminfoc = yaml.load(output, yaml.CSafeLoader)
 
-    # In kilobytes
+    # In kibibytes
     dom0minmem = int(xminfoc['dom0-min-mem']) * 1024
 
     dom0_spare_memory = currentallocation - max(minimumtarget, dom0minmem)