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#!@PYTHON@
__copyright__ = "Copyright 2018-2023 the Pacemaker project contributors"
__license__ = "GNU General Public License version 2 or later (GPLv2+) WITHOUT ANY WARRANTY"
import os
import sys
import argparse
import subprocess
# These imports allow running from a source checkout after running `make`.
# Note that while this doesn't necessarily mean it will successfully run tests,
# but being able to see --help output can be useful.
if os.path.exists("@abs_top_srcdir@/python"):
sys.path.insert(0, "@abs_top_srcdir@/python")
if os.path.exists("@abs_top_builddir@/python") and "@abs_top_builddir@" != "@abs_top_srcdir@":
sys.path.insert(0, "@abs_top_builddir@/python")
from pacemaker.exitstatus import ExitStatus
VERSION = "1.1.0"
USAGE = """Helper that presents a Pacemaker-style interface for Linux-HA stonith plugins
Should never be invoked by the user directly
Usage: fence_legacy [options]
Options:
-h usage
-t <sub agent> sub agent
-n <name> nodename
-o <string> Action: on | off | reset (default) | stat | hostlist
-s <stonith> stonith command
-q quiet mode
-V version"""
META_DATA = """<?xml version="1.0" ?>
<resource-agent name="fence_pcmk" shortdesc="Helper that presents a Pacemaker-style interface for Linux-HA stonith plugins">
<longdesc>
This agent should never be invoked by the user directly.
</longdesc>
<vendor-url>https://www.clusterlabs.org/</vendor-url>
<parameters>
<parameter name="action" unique="1" required="1">
<getopt mixed="-o <action>" />
<content type="string" default="disable" />
<shortdesc lang="en">Fencing Action</shortdesc>
</parameter>
<parameter name="port" unique="1" required="1">
<getopt mixed="-n <id>" />
<content type="string" />
<shortdesc lang="en">Physical plug number or name of virtual machine</shortdesc>
</parameter>
<parameter name="help" unique="1" required="0">
<getopt mixed="-h" />
<content type="string" />
<shortdesc lang="en">Display help and exit</shortdesc>
</parameter>
</parameters>
<actions>
<action name="enable" />
<action name="disable" />
<action name="reboot" />
<action name="off" />
<action name="on" />
<action name="status" />
<action name="list" />
<action name="metadata" />
</actions>
</resource-agent>"""
ACTIONS = [
"on",
"off",
"reset",
"reboot",
"stat",
"status",
"metadata",
"monitor",
"list",
"hostlist",
"poweroff",
"poweron"
]
def parse_cli_options():
""" Return parsed command-line options (as argparse namespace) """
# Don't add standard help option, so we can format it how we want
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("-t", metavar="SUBAGENT", dest="subagent",
nargs=1, default="none", help="sub-agent")
parser.add_argument("-n", metavar="NODE", dest="node",
nargs=1, default="", help="name of target node")
# The help text here is consistent with the original version, though
# perhaps all actions should be listed.
parser.add_argument("-o", metavar="ACTION", dest="action",
nargs=1, choices=ACTIONS, default="reset",
help="action: on | off | reset (default) | stat | hostlist")
parser.add_argument("-s", metavar="COMMAND", dest="command",
nargs=1, default="stonith", help="stonith command")
parser.add_argument("-q", dest="quiet", action="store_true",
help="quiet mode")
parser.add_argument("-h", "--help", action="store_true",
help="show usage and exit")
# Don't use action="version", because that printed to stderr before
# Python 3.4, and help2man doesn't like that.
parser.add_argument("-V", "--version", action="store_true",
help="show version and exit")
return parser.parse_args()
def parse_stdin_options(options):
""" Update options namespace with options parsed from stdin """
nlines = 0
for line in sys.stdin:
# Remove leading and trailing whitespace
line = line.strip()
# Skip blank lines and comments
if line == "" or line[0] == "#":
continue
nlines = nlines + 1
# Parse option name and value (allow whitespace around equals sign)
try:
(name, value) = line.split("=", 1)
name = name.rstrip()
if name == "":
raise ValueError
except ValueError:
print("parse error: illegal name in option %d" % nlines,
file=sys.stderr)
sys.exit(ExitStatus.INVALID_PARAM)
value = value.lstrip()
if name == "plugin":
options.subagent = value
elif name in [ "option", "action" ]:
options.action = value
elif name == "nodename":
options.node = value
os.environ[name] = value
elif name == "stonith":
options.command = value
elif name != "agent": # agent is used by fenced
os.environ[name] = value
def normalize_options(options):
""" Use string rather than list of one string """
if not hasattr(options.subagent, "strip"):
options.subagent = options.subagent[0]
if not hasattr(options.node, "strip"):
options.node = options.node[0]
if not hasattr(options.action, "strip"):
options.action = options.action[0]
if not hasattr(options.command, "strip"):
options.command = options.command[0]
def build_command(options):
""" Return command to execute (as list of arguments) """
if options.action in [ "hostlist", "list" ]:
extra_args = [ "-l" ]
elif options.action in [ "monitor", "stat", "status" ]:
extra_args = [ "-S" ]
else:
if options.node == "":
if not options.quiet:
print("failed: no plug number")
sys.exit(ExitStatus.ERROR)
extra_args = [ "-T", options.action, options.node ]
return [ options.command, "-t", options.subagent, "-E" ] + extra_args
def handle_local_options(options):
""" Handle options that don't require the fence agent """
if options.help:
print(USAGE)
sys.exit(ExitStatus.OK)
if options.version:
print(VERSION)
sys.exit(ExitStatus.OK)
def remap_action(options):
""" Pre-process requested action """
options.action = options.action.lower()
if options.action == "metadata":
print(META_DATA)
sys.exit(ExitStatus.OK)
elif options.action in [ "hostlist", "list" ]:
options.quiet = True
# Remap accepted aliases to their actual commands
elif options.action == "reboot":
options.action = "reset"
elif options.action == "poweron":
options.action = "on"
elif options.action == "poweroff":
options.action = "off"
def execute_command(options, cmd):
""" Execute command and return its exit status """
if not options.quiet:
print("Performing: " + " ".join(cmd))
return subprocess.call(cmd)
def handle_result(options, status):
""" Process fence agent result """
if status == 0:
message = "success"
exitcode = ExitStatus.OK
else:
message = "failed"
exitcode = ExitStatus.ERROR
if not options.quiet:
print("%s: %s %d" % (message, options.node, status))
sys.exit(exitcode)
def main():
""" Execute an LHA-style fence agent """
options = parse_cli_options()
handle_local_options(options)
normalize_options(options)
parse_stdin_options(options)
remap_action(options)
cmd = build_command(options)
status = execute_command(options, cmd)
handle_result(options, status)
if __name__ == "__main__":
main()
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