# Copyright 2009 Google Inc. Released under the GPL v2
"""
This module defines the base classes for the Host hierarchy.
Implementation details:
You should import the "hosts" package instead of importing each type of host.
Host: a machine on which you can run programs
"""
__author__ = """
mbligh@google.com (Martin J. Bligh),
poirier@google.com (Benjamin Poirier),
stutsman@google.com (Ryan Stutsman)
"""
import cPickle, cStringIO, logging, os, re, time
from autotest_lib.client.common_lib import global_config, error, utils
from autotest_lib.client.common_lib.cros import path_utils
from autotest_lib.client.common_lib.cros.graphite import autotest_stats
from autotest_lib.client.bin import partition
class Host(object):
"""
This class represents a machine on which you can run programs.
It may be a local machine, the one autoserv is running on, a remote
machine or a virtual machine.
Implementation details:
This is an abstract class, leaf subclasses must implement the methods
listed here. You must not instantiate this class but should
instantiate one of those leaf subclasses.
When overriding methods that raise NotImplementedError, the leaf class
is fully responsible for the implementation and should not chain calls
to super. When overriding methods that are a NOP in Host, the subclass
should chain calls to super(). The criteria for fitting a new method into
one category or the other should be:
1. If two separate generic implementations could reasonably be
concatenated, then the abstract implementation should pass and
subclasses should chain calls to super.
2. If only one class could reasonably perform the stated function
(e.g. two separate run() implementations cannot both be executed)
then the method should raise NotImplementedError in Host, and
the implementor should NOT chain calls to super, to ensure that
only one implementation ever gets executed.
"""
job = None
DEFAULT_REBOOT_TIMEOUT = global_config.global_config.get_config_value(
"HOSTS", "default_reboot_timeout", type=int, default=1800)
WAIT_DOWN_REBOOT_TIMEOUT = global_config.global_config.get_config_value(
"HOSTS", "wait_down_reboot_timeout", type=int, default=840)
WAIT_DOWN_REBOOT_WARNING = global_config.global_config.get_config_value(
"HOSTS", "wait_down_reboot_warning", type=int, default=540)
HOURS_TO_WAIT_FOR_RECOVERY = global_config.global_config.get_config_value(
"HOSTS", "hours_to_wait_for_recovery", type=float, default=2.5)
# the number of hardware repair requests that need to happen before we
# actually send machines to hardware repair
HARDWARE_REPAIR_REQUEST_THRESHOLD = 4
OP_REBOOT = 'reboot'
OP_SUSPEND = 'suspend'
PWR_OPERATION = [OP_REBOOT, OP_SUSPEND]
def __init__(self, *args, **dargs):
self._initialize(*args, **dargs)
def _initialize(self, *args, **dargs):
pass
def close(self):
pass
def setup(self):
pass
def run(self, command, timeout=3600, ignore_status=False,
stdout_tee=utils.TEE_TO_LOGS, stderr_tee=utils.TEE_TO_LOGS,
stdin=None, args=()):
"""
Run a command on this host.
@param command: the command line string
@param timeout: time limit in seconds before attempting to
kill the running process. The run() function
will take a few seconds longer than 'timeout'
to complete if it has to kill the process.
@param ignore_status: do not raise an exception, no matter
what the exit code of the command is.
@param stdout_tee/stderr_tee: where to tee the stdout/stderr
@param stdin: stdin to pass (a string) to the executed command
@param args: sequence of strings to pass as arguments to command by
quoting them in " and escaping their contents if necessary
@return a utils.CmdResult object
@raises AutotestHostRunError: the exit code of the command execution
was not 0 and ignore_status was not enabled
"""
raise NotImplementedError('Run not implemented!')
def run_output(self, command, *args, **dargs):
return self.run(command, *args, **dargs).stdout.rstrip()
def reboot(self):
raise NotImplementedError('Reboot not implemented!')
def suspend(self):
raise NotImplementedError('Suspend not implemented!')
def sysrq_reboot(self):
raise NotImplementedError('Sysrq reboot not implemented!')
def reboot_setup(self, *args, **dargs):
pass
def reboot_followup(self, *args, **dargs):
pass
def get_file(self, source, dest, delete_dest=False):
raise NotImplementedError('Get file not implemented!')
def send_file(self, source, dest, delete_dest=False):
raise NotImplementedError('Send file not implemented!')
def get_tmp_dir(self):
raise NotImplementedError('Get temp dir not implemented!')
def is_up(self):
raise NotImplementedError('Is up not implemented!')
def is_shutting_down(self):
""" Indicates is a machine is currently shutting down. """
return False
def get_wait_up_processes(self):
""" Gets the list of local processes to wait for in wait_up. """
get_config = global_config.global_config.get_config_value
proc_list = get_config("HOSTS", "wait_up_processes",
default="").strip()
processes = set(p.strip() for p in proc_list.split(","))
processes.discard("")
return processes
def get_boot_id(self, timeout=60):
""" Get a unique ID associated with the current boot.
Should return a string with the semantics such that two separate
calls to Host.get_boot_id() return the same string if the host did
not reboot between the two calls, and two different strings if it
has rebooted at least once between the two calls.
@param timeout The number of seconds to wait before timing out.
@return A string unique to this boot or None if not available."""
BOOT_ID_FILE = '/proc/sys/kernel/random/boot_id'
NO_ID_MSG = 'no boot_id available'
cmd = 'if [ -f %r ]; then cat %r; else echo %r; fi' % (
BOOT_ID_FILE, BOOT_ID_FILE, NO_ID_MSG)
boot_id = self.run(cmd, timeout=timeout).stdout.strip()
if boot_id == NO_ID_MSG:
return None
return boot_id
def wait_up(self, timeout=None):
raise NotImplementedError('Wait up not implemented!')
def wait_down(self, timeout=None, warning_timer=None, old_boot_id=None):
raise NotImplementedError('Wait down not implemented!')
def _construct_host_metadata(self, type_str):
"""Returns dict of metadata with type_str, hostname, time_recorded.
@param type_str: String representing _type field in es db.
For example: type_str='reboot_total'.
"""
metadata = {
'hostname': self.hostname,
'time_recorded': time.time(),
'_type': type_str,
}
return metadata
def wait_for_restart(self, timeout=DEFAULT_REBOOT_TIMEOUT,
down_timeout=WAIT_DOWN_REBOOT_TIMEOUT,
down_warning=WAIT_DOWN_REBOOT_WARNING,
log_failure=True, old_boot_id=None, **dargs):
""" Wait for the host to come back from a reboot. This is a generic
implementation based entirely on wait_up and wait_down. """
key_string = 'Reboot.%s' % dargs.get('board')
total_reboot_timer = autotest_stats.Timer('%s.total' % key_string,
metadata=self._construct_host_metadata('reboot_total'))
wait_down_timer = autotest_stats.Timer('%s.wait_down' % key_string,
metadata=self._construct_host_metadata('reboot_down'))
total_reboot_timer.start()
wait_down_timer.start()
if not self.wait_down(timeout=down_timeout,
warning_timer=down_warning,
old_boot_id=old_boot_id):
if log_failure:
self.record("ABORT", None, "reboot.verify", "shut down failed")
raise error.AutoservShutdownError("Host did not shut down")
wait_down_timer.stop()
wait_up_timer = autotest_stats.Timer('%s.wait_up' % key_string,
metadata=self._construct_host_metadata('reboot_up'))
wait_up_timer.start()
if self.wait_up(timeout):
self.record("GOOD", None, "reboot.verify")
self.reboot_followup(**dargs)
wait_up_timer.stop()
total_reboot_timer.stop()
else:
self.record("ABORT", None, "reboot.verify",
"Host did not return from reboot")
raise error.AutoservRebootError("Host did not return from reboot")
def verify(self):
self.verify_hardware()
self.verify_connectivity()
self.verify_software()
def verify_hardware(self):
pass
def verify_connectivity(self):
pass
def verify_software(self):
pass
def check_diskspace(self, path, gb):
"""Raises an error if path does not have at least gb GB free.
@param path The path to check for free disk space.
@param gb A floating point number to compare with a granularity
of 1 MB.
1000 based SI units are used.
@raises AutoservDiskFullHostError if path has less than gb GB free.
"""
one_mb = 10 ** 6 # Bytes (SI unit).
mb_per_gb = 1000.0
logging.info('Checking for >= %s GB of space under %s on machine %s',
gb, path, self.hostname)
df = self.run('df -PB %d %s | tail -1' % (one_mb, path)).stdout.split()
free_space_gb = int(df[3]) / mb_per_gb
if free_space_gb < gb:
raise error.AutoservDiskFullHostError(path, gb, free_space_gb)
else:
logging.info('Found %s GB >= %s GB of space under %s on machine %s',
free_space_gb, gb, path, self.hostname)
def check_inodes(self, path, min_kilo_inodes):
"""Raises an error if a file system is short on i-nodes.
@param path The path to check for free i-nodes.
@param min_kilo_inodes Minimum number of i-nodes required,
in units of 1000 i-nodes.
@raises AutoservNoFreeInodesError If the minimum required
i-node count isn't available.
"""
min_inodes = 1000 * min_kilo_inodes
logging.info('Checking for >= %d i-nodes under %s '
'on machine %s', min_inodes, path, self.hostname)
df = self.run('df -Pi %s | tail -1' % path).stdout.split()
free_inodes = int(df[3])
if free_inodes < min_inodes:
raise error.AutoservNoFreeInodesError(path, min_inodes,
free_inodes)
else:
logging.info('Found %d >= %d i-nodes under %s on '
'machine %s', free_inodes, min_inodes,
path, self.hostname)
def erase_dir_contents(self, path, ignore_status=True, timeout=3600):
"""Empty a given directory path contents."""
rm_cmd = 'find "%s" -mindepth 1 -maxdepth 1 -print0 | xargs -0 rm -rf'
self.run(rm_cmd % path, ignore_status=ignore_status, timeout=timeout)
def repair(self):
"""Try and get the host to pass `self.verify()`."""
self.verify()
def disable_ipfilters(self):
"""Allow all network packets in and out of the host."""
self.run('iptables-save > /tmp/iptable-rules')
self.run('iptables -P INPUT ACCEPT')
self.run('iptables -P FORWARD ACCEPT')
self.run('iptables -P OUTPUT ACCEPT')
def enable_ipfilters(self):
"""Re-enable the IP filters disabled from disable_ipfilters()"""
if self.path_exists('/tmp/iptable-rules'):
self.run('iptables-restore < /tmp/iptable-rules')
def cleanup(self):
pass
def machine_install(self):
raise NotImplementedError('Machine install not implemented!')
def install(self, installableObject):
installableObject.install(self)
def get_autodir(self):
raise NotImplementedError('Get autodir not implemented!')
def set_autodir(self):
raise NotImplementedError('Set autodir not implemented!')
def start_loggers(self):
""" Called to start continuous host logging. """
pass
def stop_loggers(self):
""" Called to stop continuous host logging. """
pass
# some extra methods simplify the retrieval of information about the
# Host machine, with generic implementations based on run(). subclasses
# should feel free to override these if they can provide better
# implementations for their specific Host types
def get_num_cpu(self):
""" Get the number of CPUs in the host according to /proc/cpuinfo. """
proc_cpuinfo = self.run('cat /proc/cpuinfo',
stdout_tee=open(os.devnull, 'w')).stdout
cpus = 0
for line in proc_cpuinfo.splitlines():
if line.startswith('processor'):
cpus += 1
return cpus
def get_arch(self):
""" Get the hardware architecture of the remote machine. """
cmd_uname = path_utils.must_be_installed('/bin/uname', host=self)
arch = self.run('%s -m' % cmd_uname).stdout.rstrip()
if re.match(r'i\d86$', arch):
arch = 'i386'
return arch
def get_kernel_ver(self):
""" Get the kernel version of the remote machine. """
cmd_uname = path_utils.must_be_installed('/bin/uname', host=self)
return self.run('%s -r' % cmd_uname).stdout.rstrip()
def get_cmdline(self):
""" Get the kernel command line of the remote machine. """
return self.run('cat /proc/cmdline').stdout.rstrip()
def get_meminfo(self):
""" Get the kernel memory info (/proc/meminfo) of the remote machine
and return a dictionary mapping the various statistics. """
meminfo_dict = {}
meminfo = self.run('cat /proc/meminfo').stdout.splitlines()
for key, val in (line.split(':', 1) for line in meminfo):
meminfo_dict[key.strip()] = val.strip()
return meminfo_dict
def path_exists(self, path):
""" Determine if path exists on the remote machine. """
result = self.run('ls "%s" > /dev/null' % utils.sh_escape(path),
ignore_status=True)
return result.exit_status == 0
# some extra helpers for doing job-related operations
def record(self, *args, **dargs):
""" Helper method for recording status logs against Host.job that
silently becomes a NOP if Host.job is not available. The args and
dargs are passed on to Host.job.record unchanged. """
if self.job:
self.job.record(*args, **dargs)
def log_kernel(self):
""" Helper method for logging kernel information into the status logs.
Intended for cases where the "current" kernel is not really defined
and we want to explicitly log it. Does nothing if this host isn't
actually associated with a job. """
if self.job:
kernel = self.get_kernel_ver()
self.job.record("INFO", None, None,
optional_fields={"kernel": kernel})
def log_op(self, op, op_func):
""" Decorator for wrapping a management operaiton in a group for status
logging purposes.
@param op: name of the operation.
@param op_func: a function that carries out the operation
(reboot, suspend)
"""
if self.job and not hasattr(self, "RUNNING_LOG_OP"):
self.RUNNING_LOG_OP = True
try:
self.job.run_op(op, op_func, self.get_kernel_ver)
finally:
del self.RUNNING_LOG_OP
else:
op_func()
def list_files_glob(self, glob):
"""
Get a list of files on a remote host given a glob pattern path.
"""
SCRIPT = ("python -c 'import cPickle, glob, sys;"
"cPickle.dump(glob.glob(sys.argv[1]), sys.stdout, 0)'")
output = self.run(SCRIPT, args=(glob,), stdout_tee=None,
timeout=60).stdout
return cPickle.loads(output)
def symlink_closure(self, paths):
"""
Given a sequence of path strings, return the set of all paths that
can be reached from the initial set by following symlinks.
@param paths: sequence of path strings.
@return: a sequence of path strings that are all the unique paths that
can be reached from the given ones after following symlinks.
"""
SCRIPT = ("python -c 'import cPickle, os, sys\n"
"paths = cPickle.load(sys.stdin)\n"
"closure = {}\n"
"while paths:\n"
" path = paths.keys()[0]\n"
" del paths[path]\n"
" if not os.path.exists(path):\n"
" continue\n"
" closure[path] = None\n"
" if os.path.islink(path):\n"
" link_to = os.path.join(os.path.dirname(path),\n"
" os.readlink(path))\n"
" if link_to not in closure.keys():\n"
" paths[link_to] = None\n"
"cPickle.dump(closure.keys(), sys.stdout, 0)'")
input_data = cPickle.dumps(dict((path, None) for path in paths), 0)
output = self.run(SCRIPT, stdout_tee=None, stdin=input_data,
timeout=60).stdout
return cPickle.loads(output)
def cleanup_kernels(self, boot_dir='/boot'):
"""
Remove any kernel image and associated files (vmlinux, system.map,
modules) for any image found in the boot directory that is not
referenced by entries in the bootloader configuration.
@param boot_dir: boot directory path string, default '/boot'
"""
# find all the vmlinuz images referenced by the bootloader
vmlinuz_prefix = os.path.join(boot_dir, 'vmlinuz-')
boot_info = self.bootloader.get_entries()
used_kernver = [boot['kernel'][len(vmlinuz_prefix):]
for boot in boot_info.itervalues()]
# find all the unused vmlinuz images in /boot
all_vmlinuz = self.list_files_glob(vmlinuz_prefix + '*')
used_vmlinuz = self.symlink_closure(vmlinuz_prefix + kernver
for kernver in used_kernver)
unused_vmlinuz = set(all_vmlinuz) - set(used_vmlinuz)
# find all the unused vmlinux images in /boot
vmlinux_prefix = os.path.join(boot_dir, 'vmlinux-')
all_vmlinux = self.list_files_glob(vmlinux_prefix + '*')
used_vmlinux = self.symlink_closure(vmlinux_prefix + kernver
for kernver in used_kernver)
unused_vmlinux = set(all_vmlinux) - set(used_vmlinux)
# find all the unused System.map files in /boot
systemmap_prefix = os.path.join(boot_dir, 'System.map-')
all_system_map = self.list_files_glob(systemmap_prefix + '*')
used_system_map = self.symlink_closure(
systemmap_prefix + kernver for kernver in used_kernver)
unused_system_map = set(all_system_map) - set(used_system_map)
# find all the module directories associated with unused kernels
modules_prefix = '/lib/modules/'
all_moddirs = [dir for dir in self.list_files_glob(modules_prefix + '*')
if re.match(modules_prefix + r'\d+\.\d+\.\d+.*', dir)]
used_moddirs = self.symlink_closure(modules_prefix + kernver
for kernver in used_kernver)
unused_moddirs = set(all_moddirs) - set(used_moddirs)
# remove all the vmlinuz files we don't use
# TODO: if needed this should become package manager agnostic
for vmlinuz in unused_vmlinuz:
# try and get an rpm package name
rpm = self.run('rpm -qf', args=(vmlinuz,),
ignore_status=True, timeout=120)
if rpm.exit_status == 0:
packages = set(line.strip() for line in
rpm.stdout.splitlines())
# if we found some package names, try to remove them
for package in packages:
self.run('rpm -e', args=(package,),
ignore_status=True, timeout=120)
# remove the image files anyway, even if rpm didn't
self.run('rm -f', args=(vmlinuz,),
ignore_status=True, timeout=120)
# remove all the vmlinux and System.map files left over
for f in (unused_vmlinux | unused_system_map):
self.run('rm -f', args=(f,),
ignore_status=True, timeout=120)
# remove all unused module directories
# the regex match should keep us safe from removing the wrong files
for moddir in unused_moddirs:
self.run('rm -fr', args=(moddir,), ignore_status=True)