Modified invirt-remote-create to use new availability remctl.
[invirt/packages/invirt-remote.git] / host / usr / sbin / invirt-availability
1 #!/usr/bin/env python
2 """
3 Gathers availability data for the VM host it's running on.
4 """
5
6 from subprocess import PIPE, Popen, call
7 import sys
8 import yaml
9
10 # return the amount of memory in kilobytes represented by s
11 def parseUnits(s):
12     num, unit = s.split(' ')
13     return int(num) * {'kb':1, 'mb':1024}[unit.lower()]
14
15 def main(argv):
16     p = Popen(['/usr/sbin/xm', 'info'], stdout=PIPE)
17     output = p.communicate()[0]
18     if p.returncode != 0:
19         raise RuntimeError("Command '%s' returned non-zero exit status %d"
20                            % ('invirt-availability', p.returncode)) 
21     xminfo = yaml.load(output, yaml.CSafeLoader)
22
23     # In kilobytes
24     free_memory = int(xminfo['free_memory']) * 1024
25
26     f = open('/proc/xen/balloon', 'r')
27     ballooninfo = yaml.load(f.read())
28     f.close()
29     currentallocation = parseUnits(ballooninfo['Current allocation'])
30     minimumtarget = parseUnits(ballooninfo['Minimum target'])
31
32     p = Popen(['/usr/sbin/xm', 'info', '-c'], stdout=PIPE)
33     output = p.communicate()[0]
34     if p.returncode != 0:
35         raise RuntimeError("Command '%s' returned non-zero exit status %d"
36                            % ('invirt-availability', p.returncode)) 
37     xminfoc = yaml.load(output, yaml.CSafeLoader)
38
39     # In kilobytes
40     dom0minmem = int(xminfoc['dom0-min-mem']) * 1024
41
42     dom0_spare_memory = currentallocation - max(minimumtarget, dom0minmem)
43     print int((free_memory + dom0_spare_memory)/1024)
44     return 0
45
46 if __name__ == '__main__':
47     sys.exit(main(sys.argv))