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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import pymongo
import sys
import inspect
import kpov_random_helpers
import settings
import guestfs
import os
import glob
import subprocess
import fcntl
import pyssh
import paramiko
class SSHGuestFs():
def __init__(hostname, username, password):
s = pxssh.pxssh()
hostname = raw_input('hostname: ')
username = raw_input('username: ')
password = getpass.getpass('password: ')
s.login (hostname, username, password)
s.sendline ('uptime')
self.conn = pxssh.open(hostname, username, password)
def chmod(self, mode, path)
self.conn.
def chown(self, owner, group, path)
pass
def command(self, arguments)
pass
def cp(self, src, dest)
pass
def cp_a(self, src, dest)
pass
def cp_r(self, src, dest)
pass
def dd(self, src, dest)
pass
def df(self)
pass
def download(self)
pass
def du(self, path)
pass
def equal(self, file1, file2)
pass
def file(self, path)
pass
def getxattrs(self, path)
pass
def mv (self, src, dest):
pass
def read_file (self, path):
pass
def readdir (self, dir):
pass
def readlink (self, path):
pass
def rename (self, oldpath, newpath):
pass
def rm (self, path):
pass
def rm_rf (self, path):
pass
def rmdir (self, path):
pass
def setxattr (self, xattr, val, vallen, path):
pass
def write (self, path, content):
"""This call creates a file called "path". The content of
the file is the string "content" (which can contain any
8 bit data).
See also "g.write_append".
"""
self._check_not_closed ()
r = libguestfsmod.write (self._o, path, content)
return r
def write_append (self, path, content):
"""This call appends "content" to the end of file "path".
If "path" does not exist, then a new file is created.
See also "g.write".
"""
self._check_not_closed ()
r = libguestfsmod.write_append (self._o, path, content)
return r
def write_file (self, path, content, size):
# The external cmp(1) program is used for the comparison.
def get_prepare_disks(db, task_id):
prepare_disks_source = db.prepare_disks.find_one({'task_id':task_id})['source']
prepare_disks_code = compile(prepare_disks_source, 'prepare_disks.py', 'exec')
exec(prepare_disks_code)
return prepare_disks
def create_snapshot(task_id, student_id, disk_name, overwrite = True, cow = False):
print(os.path.join(settings.DISK_TEMPLATE_PATH, task_id, disk_name) + '.*')
template_paths = glob.glob(os.path.join(settings.DISK_TEMPLATE_PATH, task_id, disk_name) + '.*')
filtered_paths = filter((lambda x: os.path.splitext(x)[1] == '.' + settings.STUDENT_DISK_FORMAT), template_paths)
if filtered_paths:
template_path = filtered_paths[0]
else:
template_path = template_paths[0]
if cow:
d = os.path.join(student_id, task_id, disk_name) + os.path.splitext(template_path)[1]
else:
d = os.path.join(student_id, task_id, disk_name) + '.qcow2'
try:
os.makedirs(os.path.join(settings.STUDENT_DISK_PATH, student_id, task_id))
except:
pass
disk_file = os.path.join(settings.STUDENT_DISK_PATH, d)
if overwrite or not os.path.exists(disk_file):
if cow:
subprocess.call(['cp', '--reflink=always', template_path, disk_file])
else:
subprocess.call(['qemu-img', 'create', '-f', 'qcow2', '-o', 'backing_file=' + template_path,
disk_file])
return d
def publish_snapshot(d):
if os.path.splitext(d)[1][1:] != settings.STUDENT_DISK_FORMAT:
snap_name = os.path.splitext(d)[0] + '.' + settings.STUDENT_DISK_FORMAT
disk_file = os.path.join(settings.STUDENT_DISK_PATH, d)
snap_file = os.path.join(settings.STUDENT_DISK_PATH, snap_name)
subprocess.call(['qemu-img', 'convert', '-f', 'qcow2', '-O', settings.STUDENT_DISK_FORMAT, disk_file,
snap_file])
url = settings.STUDENT_DISK_URL + snap_name
else:
url = settings.STUDENT_DISK_URL + d
return url
if __name__ == '__main__':
if len(sys.argv) != 1:
print "Usage: {0}"
print "Create the neccessarry disk images"
db = pymongo.Connection(settings.DB_HOST).kpov
try:
db.authenticate(settings.USERNAME, settings.PASSWORD)
except Exception, e:
print str(e)
dev_prefix = settings.GUESTFS_DEV_PREFIX
l = db.student_computers.find({"disk_urls": {"$exists": False}})
computers_by_task_student = dict()
for computer in l:
student_id, task_id = computer['student_id'], computer['task_id']
if (task_id, student_id) not in computers_by_task_student:
computers_by_task_student[(task_id, student_id)] = list()
computers_by_task_student[(task_id, student_id)].append(computer)
for (task_id, student_id), computers in computers_by_task_student.iteritems():
l = db.student_computers.find_one({'task_id': task_id, 'student_id':student_id, "disk_urls": {"$exists": False}})
if l is None:
continue
lock_file = os.path.join(settings.STUDENT_LOCKFILE_PATH,
'{0}-{1}.lock'.format(student_id, task_id))
lock_fp = open(lock_file, 'w')
try:
fcntl.lockf(lock_fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
except IOError:
continue
params = db.task_params.find_one({'task_id': task_id, 'student_id': student_id})['params']
prepare_disks = get_prepare_disks(db, task_id)
# tule odpri, ustvari snapshote za vajo
templates = dict()
all_disks = dict()
parts = dict()
for computer in computers:
lock_fp.write('creating computer ' + computer['name'] + '\n')
all_disks[computer['name']] = dict()
manual_disks = list()
this_computers_disks = set()
try_automount = False
g = guestfs.GuestFS()
for disk in computer['disks']:
lock_fp.write("register " + disk['name'] + '\n')
snap = create_snapshot(task_id, student_id, disk['name'],
cow = settings.STUDENT_DISK_COW)
snap_file = os.path.join(settings.STUDENT_DISK_PATH, snap)
if 'options' in disk:
g.add_drive_opts(snap_file, **(disk['options']))
else:
g.add_drive(snap_file)
if 'parts' in disk:
for p in disk['parts']:
manual_disks.append((dev_prefix + p['dev'],
p['path'], p.get('options', None)))
else:
try_automount = True
templates[disk['name']] = g
all_disks[computer['name']][disk['name']] = snap
g.launch()
mounted = set()
if try_automount:
roots = g.inspect_os()
for root in roots:
mps = g.inspect_get_mountpoints(root)
lock_fp.write("detected:"+str(mps)+'\n')
for mountpoint, device in sorted(mps):
if mountpoint not in mounted:
try:
g.mount(device, mountpoint, )
lock_fp.write( 'mounted ' + device + ' on ' + mountpoint + '\n')
except RuntimeError as msg:
lock_fp.write( "%s (ignored)\n" % msg)
mounted.add(mountpoint)
for device, mountpoint, opts in manual_disks:
try:
if opts is not None:
g.mount_options(opts, device, mountpoint)
else:
g.mount(device, mountpoint)
lock_fp.write('manually mounted ' + device + " on " + mountpoint + '\n')
except RuntimeError as msg:
lock_fp.write( "%s (ignored)\n" % msg)
lock_fp.write("preparing disks\n")
prepare_disks(templates, params)
# pospravi za seboj.
lock_fp.write("unmounting\n")
for g in set(templates.values()):
g.umount_all()
g.close()
lock_fp.write("saving URLs\n")
for comp_name, d_dict in all_disks.iteritems():
disk_urls = list()
for d_name, d in d_dict.iteritems():
lock_fp.write('publishing '+ str(d) + '\n')
url = publish_snapshot(d)
lock_fp.write('published as '+ url + '\n')
disk_urls.append({'name': d_name, 'url': url})
lock_fp.write('urls: '+ str(disk_urls) + '\n')
l = db.student_computers.update({
"disk_urls": {"$exists": False},
'student_id': student_id,
'task_id': task_id,
'name': comp_name},
{'$set': { 'disk_urls': disk_urls }})
# print "done for ", student_id, task_id
os.unlink(lock_file)
lock_fp.close()
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