/usr/share/check_mk/checks/mounts is in check-mk-server 1.2.6p12-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | #!/usr/bin/python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2014             mk@mathias-kettner.de |
# +------------------------------------------------------------------+
#
# This file is part of Check_MK.
# The official homepage is at http://mathias-kettner.de/check_mk.
#
# check_mk is free software;  you can redistribute it and/or modify it
# under the  terms of the  GNU General Public License  as published by
# the Free Software Foundation in version 2.  check_mk is  distributed
# in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
# out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
# PARTICULAR PURPOSE. See the  GNU General Public License for more de-
# ails.  You should have  received  a copy of the  GNU  General Public
# License along with GNU Make; see the file  COPYING.  If  not,  write
# to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
# Boston, MA 02110-1301 USA.
def inventory_mounts(info):
    inventory = []
    devices = []
    for dev, mp, fstype, options, dump, fsck in info:
        if fstype not in [ 'tmpfs' ] and dev not in devices:
            devices.append(dev)
            opts = options.split(",")
            opts.sort()
            inventory.append( (mp, opts) )
    return inventory
def check_mounts(item, targetopts, info):
    for dev, mp, fstype, options, dump, fsck in info:
        if item == mp:
            opts = options.split(",")
            # Now compute the exact difference.
            exceeding = []
            for o in opts:
                if o not in targetopts and not o.startswith("commit=") \
                                       and not o.startswith("localalloc="):
                    exceeding.append(o)
            missing = []
            for o in targetopts:
                if o not in opts and not o.startswith("commit=") \
                                 and not o.startswith("localalloc="):
                    missing.append(o)
            if not missing and not exceeding:
                return (0, "mount options exactly as expected")
            infos = []
            if missing:
                infos.append("missing: %s" % ",".join(missing))
            if exceeding:
                infos.append("exceeding: %s" % ",".join(exceeding))
            infotext = ", ".join(infos)
            if "ro" in exceeding:
                return (2, "filesystem has switched to read-only "
                           "and is probably corrupted(!!), " + infotext)
            # Just warn in other cases
            return (1, infotext)
    return (3, "filesystem not mounted")
check_info["mounts"] = {
    'check_function':          check_mounts,
    'inventory_function':      inventory_mounts,
    'service_description':     'Mount options of %s',
    'group':                   'fs_mount_options',
}
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