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#!/usr/bin/env python3
# Copyright (C) 2017 Canonical Ltd.
#
# This file is part of cloud-init. See LICENSE file for license information.
"""Define 'status' utility and handler as part of cloud-init commandline."""
import argparse
import enum
import json
import os
import sys
from copy import deepcopy
from time import gmtime, sleep, strftime
from typing import Any, Dict, List, NamedTuple, Optional, Tuple, Union
from cloudinit import safeyaml, subp
from cloudinit.cmd.devel import read_cfg_paths
from cloudinit.distros import uses_systemd
from cloudinit.helpers import Paths
from cloudinit.util import get_cmdline, load_file, load_json
CLOUDINIT_DISABLED_FILE = "/etc/cloud/cloud-init.disabled"
# customer visible status messages
@enum.unique
class UXAppStatus(enum.Enum):
"""Enum representing user-visible cloud-init application status."""
NOT_RUN = "not run"
RUNNING = "running"
DONE = "done"
ERROR = "error"
DEGRADED_DONE = "degraded done"
DEGRADED_RUNNING = "degraded running"
DISABLED = "disabled"
# Extend states when degraded
UXAppStatusDegradedMap = {
UXAppStatus.RUNNING: UXAppStatus.DEGRADED_RUNNING,
UXAppStatus.DONE: UXAppStatus.DEGRADED_DONE,
}
# Map extended states back to simplified states
UXAppStatusDegradedMapCompat = {
UXAppStatus.DEGRADED_RUNNING: UXAppStatus.RUNNING,
UXAppStatus.DEGRADED_DONE: UXAppStatus.DONE,
}
@enum.unique
class UXAppBootStatusCode(enum.Enum):
"""Enum representing user-visible cloud-init boot status codes."""
DISABLED_BY_GENERATOR = "disabled-by-generator"
DISABLED_BY_KERNEL_CMDLINE = "disabled-by-kernel-cmdline"
DISABLED_BY_MARKER_FILE = "disabled-by-marker-file"
DISABLED_BY_ENV_VARIABLE = "disabled-by-environment-variable"
ENABLED_BY_GENERATOR = "enabled-by-generator"
ENABLED_BY_KERNEL_CMDLINE = "enabled-by-kernel-cmdline"
ENABLED_BY_SYSVINIT = "enabled-by-sysvinit"
UNKNOWN = "unknown"
DISABLED_BOOT_CODES = frozenset(
[
UXAppBootStatusCode.DISABLED_BY_GENERATOR,
UXAppBootStatusCode.DISABLED_BY_KERNEL_CMDLINE,
UXAppBootStatusCode.DISABLED_BY_MARKER_FILE,
UXAppBootStatusCode.DISABLED_BY_ENV_VARIABLE,
]
)
class StatusDetails(NamedTuple):
status: UXAppStatus
boot_status_code: UXAppBootStatusCode
description: str
errors: List[str]
recoverable_errors: Dict[str, List[str]]
last_update: str
datasource: Optional[str]
v1: Dict[str, Dict]
TABULAR_LONG_TMPL = """\
extended_status: {extended_status}
boot_status_code: {boot_code}
{last_update}detail:
{description}"""
def get_parser(parser=None):
"""Build or extend an arg parser for status utility.
@param parser: Optional existing ArgumentParser instance representing the
status subcommand which will be extended to support the args of
this utility.
@returns: ArgumentParser with proper argument configuration.
"""
if not parser:
parser = argparse.ArgumentParser(
prog="status", description="Report run status of cloud init"
)
parser.add_argument(
"--format",
type=str,
choices=["json", "tabular", "yaml"],
default="tabular",
help="Specify output format for cloud-id (default: tabular)",
)
parser.add_argument(
"-l",
"--long",
action="store_true",
default=False,
help=(
"Report long format of statuses including run stage name and"
" error messages"
),
)
parser.add_argument(
"-w",
"--wait",
action="store_true",
default=False,
help="Block waiting on cloud-init to complete",
)
return parser
def handle_status_args(name, args) -> int:
"""Handle calls to 'cloud-init status' as a subcommand."""
# Read configured paths
paths = read_cfg_paths()
details = get_status_details(paths)
if args.wait:
while details.status in (
UXAppStatus.NOT_RUN,
UXAppStatus.RUNNING,
UXAppStatus.DEGRADED_RUNNING,
):
if args.format == "tabular":
sys.stdout.write(".")
sys.stdout.flush()
details = get_status_details(paths)
sleep(0.25)
details_dict: Dict[str, Union[None, str, List[str], Dict[str, Any]]] = {
"datasource": details.datasource,
"boot_status_code": details.boot_status_code.value,
"status": UXAppStatusDegradedMapCompat.get(
details.status, details.status
).value,
"extended_status": details.status.value,
"detail": details.description,
"errors": details.errors,
"recoverable_errors": details.recoverable_errors,
"last_update": details.last_update,
**details.v1,
}
if args.format == "tabular":
prefix = "\n" if args.wait else ""
# For backwards compatability, don't report degraded status here,
# extended_status key reports the complete status (includes degraded)
state = UXAppStatusDegradedMapCompat.get(
details.status, details.status
).value
print(f"{prefix}status: {state}")
if args.long:
if details.last_update:
last_update = f"last_update: {details.last_update}\n"
else:
last_update = ""
print(
TABULAR_LONG_TMPL.format(
extended_status=details.status.value,
prefix=prefix,
boot_code=details.boot_status_code.value,
description=details.description,
last_update=last_update,
)
+ (
"\nerrors:"
+ (
"\n\t- " + "\n\t- ".join(details.errors)
if details.errors
else f" {details.errors}"
)
)
+ (
"\nrecoverable_errors:"
+ (
"\n"
+ "\n".join(
[
f"{k}:\n\t- "
+ "\n\t- ".join(
[i.replace("\n", " ") for i in v]
)
for k, v in details.recoverable_errors.items()
]
)
if details.recoverable_errors
else f" {details.recoverable_errors}"
)
)
)
elif args.format == "json":
print(
json.dumps( # Pretty, sorted json
details_dict, indent=2, sort_keys=True, separators=(",", ": ")
)
)
elif args.format == "yaml":
print(safeyaml.dumps(details_dict))
# Hard error
if details.status == UXAppStatus.ERROR:
return 1
# Recoverable error
elif details.status in UXAppStatusDegradedMap.values():
return 0
return 0
def get_bootstatus(disable_file, paths) -> Tuple[UXAppBootStatusCode, str]:
"""Report whether cloud-init current boot status
@param disable_file: The path to the cloud-init disable file.
@param paths: An initialized cloudinit.helpers.Paths object.
@returns: A tuple containing (code, reason) about cloud-init's status and
why.
"""
cmdline_parts = get_cmdline().split()
if not uses_systemd():
bootstatus_code = UXAppBootStatusCode.ENABLED_BY_SYSVINIT
reason = "Cloud-init enabled on sysvinit"
elif "cloud-init=enabled" in cmdline_parts:
bootstatus_code = UXAppBootStatusCode.ENABLED_BY_KERNEL_CMDLINE
reason = "Cloud-init enabled by kernel command line cloud-init=enabled"
elif os.path.exists(disable_file):
bootstatus_code = UXAppBootStatusCode.DISABLED_BY_MARKER_FILE
reason = "Cloud-init disabled by {0}".format(disable_file)
elif "cloud-init=disabled" in cmdline_parts:
bootstatus_code = UXAppBootStatusCode.DISABLED_BY_KERNEL_CMDLINE
reason = "Cloud-init disabled by kernel parameter cloud-init=disabled"
elif "cloud-init=disabled" in os.environ.get("KERNEL_CMDLINE", "") or (
uses_systemd()
and "cloud-init=disabled"
in subp.subp(["systemctl", "show-environment"]).stdout
):
bootstatus_code = UXAppBootStatusCode.DISABLED_BY_ENV_VARIABLE
reason = (
"Cloud-init disabled by environment variable "
"KERNEL_CMDLINE=cloud-init=disabled"
)
elif os.path.exists(os.path.join(paths.run_dir, "disabled")):
bootstatus_code = UXAppBootStatusCode.DISABLED_BY_GENERATOR
reason = "Cloud-init disabled by cloud-init-generator"
elif os.path.exists(os.path.join(paths.run_dir, "enabled")):
bootstatus_code = UXAppBootStatusCode.ENABLED_BY_GENERATOR
reason = "Cloud-init enabled by systemd cloud-init-generator"
else:
bootstatus_code = UXAppBootStatusCode.UNKNOWN
reason = "Systemd generator may not have run yet."
return (bootstatus_code, reason)
def _get_systemd_status() -> Optional[UXAppStatus]:
"""Get status from systemd.
Using systemd, we can get more fine-grained status of the
individual unit. Determine if we're still
running or if there's an error we haven't otherwise detected
"""
for service in [
"cloud-final.service",
"cloud-config.service",
"cloud-init.service",
"cloud-init-local.service",
]:
stdout = subp.subp(
[
"systemctl",
"show",
"--property=ActiveState,UnitFileState,SubState,MainPID",
service,
],
).stdout
states = dict(
[[x.strip() for x in r.split("=")] for r in stdout.splitlines()]
)
if not (
states["UnitFileState"].startswith("enabled")
or states["UnitFileState"] == "static"
):
# Individual services should not get disabled
return UXAppStatus.ERROR
if states["ActiveState"] == "active":
if states["SubState"] == "exited":
# Service exited normally, nothing interesting from systemd
continue
elif states["SubState"] == "running" and states["MainPID"] == "0":
# Service is active, substate still reports running due to
# daemon or backgroud process spawned by CGroup/slice still
# running. MainPID being set back to 0 means control of the
# service/unit has exited in this case and
# "the process is no longer around".
continue
if states["ActiveState"] == "failed" or states["SubState"] == "failed":
# We have an error
return UXAppStatus.ERROR
# If we made it here, our unit is enabled and it hasn't exited
# normally or exited with failure, so it is still running.
return UXAppStatus.RUNNING
# All services exited normally or aren't enabled, so don't report
# any particular status based on systemd.
return None
def get_status_details(paths: Optional[Paths] = None) -> StatusDetails:
"""Return a dict with status, details and errors.
@param paths: An initialized cloudinit.helpers.paths object.
Values are obtained from parsing paths.run_dir/status.json.
"""
paths = paths or read_cfg_paths()
status = UXAppStatus.NOT_RUN
errors = []
datasource: Optional[str] = ""
status_v1 = {}
status_file = os.path.join(paths.run_dir, "status.json")
result_file = os.path.join(paths.run_dir, "result.json")
boot_status_code, description = get_bootstatus(
CLOUDINIT_DISABLED_FILE, paths
)
if boot_status_code in DISABLED_BOOT_CODES:
status = UXAppStatus.DISABLED
if os.path.exists(status_file):
if not os.path.exists(result_file):
status = UXAppStatus.RUNNING
status_v1 = load_json(load_file(status_file)).get("v1", {})
latest_event = 0
recoverable_errors = {}
for key, value in sorted(status_v1.items()):
if key == "stage":
if value:
status = UXAppStatus.RUNNING
description = "Running in stage: {0}".format(value)
elif key == "datasource":
if value is None:
# If ds not yet written in status.json, then keep previous
# description
datasource = value
continue
description = value
ds, _, _ = value.partition(" ")
datasource = ds.lower().replace("datasource", "")
elif isinstance(value, dict):
errors.extend(value.get("errors", []))
start = value.get("start") or 0
finished = value.get("finished") or 0
# Aggregate recoverable_errors from all stages
current_recoverable_errors = value.get("recoverable_errors", {})
for err_type in current_recoverable_errors.keys():
if err_type not in recoverable_errors:
recoverable_errors[err_type] = deepcopy(
current_recoverable_errors[err_type]
)
else:
recoverable_errors[err_type].extend(
current_recoverable_errors[err_type]
)
if finished == 0 and start != 0:
status = UXAppStatus.RUNNING
event_time = max(start, finished)
if event_time > latest_event:
latest_event = event_time
if errors:
status = UXAppStatus.ERROR
elif status == UXAppStatus.NOT_RUN and latest_event > 0:
status = UXAppStatus.DONE
if uses_systemd() and status not in (
UXAppStatus.NOT_RUN,
UXAppStatus.DISABLED,
):
systemd_status = _get_systemd_status()
if systemd_status:
status = systemd_status
last_update = (
strftime("%a, %d %b %Y %H:%M:%S %z", gmtime(latest_event))
if latest_event
else ""
)
if recoverable_errors:
status = UXAppStatusDegradedMap.get(status, status)
# this key is a duplicate
status_v1.pop("datasource", None)
return StatusDetails(
status,
boot_status_code,
description,
errors,
recoverable_errors,
last_update,
datasource,
status_v1,
)
def main():
"""Tool to report status of cloud-init."""
parser = get_parser()
sys.exit(handle_status_args("status", parser.parse_args()))
if __name__ == "__main__":
main()