Файловый менеджер

Файловый менеджер - Редактировать - /snap/core18/2846/usr/lib/python3/dist-packages/cloudinit/config/cc_mounts.py

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# Copyright (C) 2009-2010 Canonical Ltd. # Copyright (C) 2012 Hewlett-Packard Development Company, L.P. # # Author: Scott Moser <scott.moser@canonical.com> # Author: Juerg Haefliger <juerg.haefliger@hp.com> # # This file is part of cloud-init. See LICENSE file for license information. """Mounts: Configure mount points and swap files""" import logging import math import os import re from logging import Logger from string import whitespace from textwrap import dedent from cloudinit import subp, type_utils, util from cloudinit.cloud import Cloud from cloudinit.config import Config from cloudinit.config.schema import MetaSchema, get_meta_doc from cloudinit.settings import PER_INSTANCE MODULE_DESCRIPTION = """\ This module can add or remove mountpoints from ``/etc/fstab`` as well as configure swap. The ``mounts`` config key takes a list of fstab entries to add. Each entry is specified as a list of ``[ fs_spec, fs_file, fs_vfstype, fs_mntops, fs-freq, fs_passno ]``. For more information on these options, consult the manual for ``/etc/fstab``. When specifying the ``fs_spec``, if the device name starts with one of ``xvd``, ``sd``, ``hd``, or ``vd``, the leading ``/dev`` may be omitted. Any mounts that do not appear to either an attached block device or network resource will be skipped with a log like "Ignoring nonexistent mount ...". Cloud-init will attempt to add the following mount directives if available and unconfigured in `/etc/fstab`:: mounts: - ["ephemeral0", "/mnt", "auto",\ "defaults,nofail,x-systemd.requires=cloud-init.service", "0", "2"] - ["swap", "none", "swap", "sw", "0", "0"] In order to remove a previously listed mount, an entry can be added to the `mounts` list containing ``fs_spec`` for the device to be removed but no mountpoint (i.e. ``[ swap ]`` or ``[ swap, null ]``). The ``mount_default_fields`` config key allows default options to be specified for the values in a ``mounts`` entry that are not specified, aside from the ``fs_spec`` and the ``fs_file``. If specified, this must be a list containing 6 values. It defaults to:: mount_default_fields: [none, none, "auto",\ "defaults,nofail,x-systemd.requires=cloud-init.service", "0", "2"] Non-systemd init systems will vary in ``mount_default_fields``. Swap files can be configured by setting the path to the swap file to create with ``filename``, the size of the swap file with ``size`` maximum size of the swap file if using an ``size: auto`` with ``maxsize``. By default no swap file is created. """ example = dedent( """\ # Mount ephemeral0 with "noexec" flag, /dev/sdc with mount_default_fields, # and /dev/xvdh with custom fs_passno "0" to avoid fsck on the mount. # Also provide an automatically sized swap with a max size of 10485760 # bytes. mounts: - [ /dev/ephemeral0, /mnt, auto, "defaults,noexec" ] - [ sdc, /opt/data ] - [ xvdh, /opt/data, auto, "defaults,nofail", "0", "0" ] mount_default_fields: [None, None, auto, "defaults,nofail", "0", "2"] swap: filename: /my/swapfile size: auto maxsize: 10485760 """ ) distros = ["all"] meta: MetaSchema = { "id": "cc_mounts", "name": "Mounts", "title": "Configure mount points and swap files", "description": MODULE_DESCRIPTION, "distros": distros, "examples": [ example, dedent( """\ # Create a 2 GB swap file at /swapfile using human-readable values swap: filename: /swapfile size: 2G maxsize: 2G """ ), ], "frequency": PER_INSTANCE, "activate_by_schema_keys": [], } __doc__ = get_meta_doc(meta) # Shortname matches 'sda', 'sda1', 'xvda', 'hda', 'sdb', xvdb, vda, vdd1, sr0 DEVICE_NAME_FILTER = r"^([x]{0,1}[shv]d[a-z][0-9]\|sr[0-9]+)$" DEVICE_NAME_RE = re.compile(DEVICE_NAME_FILTER) # Name matches 'server:/path' NETWORK_NAME_FILTER = r"^.+:." NETWORK_NAME_RE = re.compile(NETWORK_NAME_FILTER) WS = re.compile("[%s]+" % (whitespace)) FSTAB_PATH = "/etc/fstab" MNT_COMMENT = "comment=cloudconfig" MB = 220 GB = 230 LOG = logging.getLogger(__name__) def is_meta_device_name(name): # return true if this is a metadata service name if name in ["ami", "root", "swap"]: return True # names 'ephemeral0' or 'ephemeral1' # 'ebs[0-9]' appears when '--block-device-mapping sdf=snap-d4d90bbc' for enumname in ("ephemeral", "ebs"): if name.startswith(enumname) and name.find(":") == -1: return True return False def is_network_device(name): # return true if this is a network device if NETWORK_NAME_RE.match(name): return True return False def _get_nth_partition_for_device(device_path, partition_number): potential_suffixes = [ str(partition_number), "p%s" % (partition_number,), "-part%s" % (partition_number,), ] for suffix in potential_suffixes: potential_partition_device = "%s%s" % (device_path, suffix) if os.path.exists(potential_partition_device): return potential_partition_device return None def _is_block_device(device_path, partition_path=None): device_name = os.path.realpath(device_path).split("/")[-1] sys_path = os.path.join("/sys/block/", device_name) if partition_path is not None: sys_path = os.path.join( sys_path, os.path.realpath(partition_path).split("/")[-1] ) return os.path.exists(sys_path) def sanitize_devname(startname, transformer, log, aliases=None): log.debug("Attempting to determine the real name of %s", startname) # workaround, allow user to specify 'ephemeral' # rather than more ec2 correct 'ephemeral0' devname = startname if devname == "ephemeral": devname = "ephemeral0" log.debug("Adjusted mount option from ephemeral to ephemeral0") if is_network_device(startname): return startname device_path, partition_number = util.expand_dotted_devname(devname) orig = device_path if aliases: device_path = aliases.get(device_path, device_path) if orig != device_path: log.debug("Mapped device alias %s to %s", orig, device_path) if is_meta_device_name(device_path): device_path = transformer(device_path) if not device_path: return None if not device_path.startswith("/"): device_path = "/dev/%s" % (device_path,) log.debug("Mapped metadata name %s to %s", orig, device_path) else: if DEVICE_NAME_RE.match(startname): device_path = "/dev/%s" % (device_path,) partition_path = None if partition_number is None: partition_path = _get_nth_partition_for_device(device_path, 1) else: partition_path = _get_nth_partition_for_device( device_path, partition_number ) if partition_path is None: return None if _is_block_device(device_path, partition_path): if partition_path is not None: return partition_path return device_path return None def suggested_swapsize(memsize=None, maxsize=None, fsys=None): # make a suggestion on the size of swap for this system. if memsize is None: memsize = util.read_meminfo()["total"] sugg_max = memsize * 2 info = {"avail": "na", "max_in": maxsize, "mem": memsize} if fsys is None and maxsize is None: # set max to default if no filesystem given maxsize = sugg_max elif fsys: statvfs = os.statvfs(fsys) avail = statvfs.f_frsize * statvfs.f_bfree info["avail"] = avail if maxsize is None: # set to 25% of filesystem space maxsize = min(int(avail / 4), sugg_max) elif maxsize > ((avail * 0.9)): # set to 90% of available disk space maxsize = int(avail * 0.9) elif maxsize is None: maxsize = sugg_max info["max"] = maxsize if memsize < 4 * GB: minsize = memsize elif memsize < 16 * GB: minsize = 4 * GB else: minsize = round(math.sqrt(memsize / GB)) * GB size = min(minsize, maxsize) info["size"] = size pinfo = {} for k, v in info.items(): if isinstance(v, int): pinfo[k] = "%s MB" % (v / MB) else: pinfo[k] = v LOG.debug( "suggest %s swap for %s memory with '%s' disk given max=%s [max=%s]'", pinfo["size"], pinfo["mem"], pinfo["avail"], pinfo["max_in"], pinfo["max"], ) return size def create_swapfile(fname: str, size: str) -> None: """Size is in MiB.""" errmsg = "Failed to create swapfile '%s' of size %sMB via %s: %s" def create_swap(fname, size, method): LOG.debug( "Creating swapfile in '%s' on fstype '%s' using '%s'", fname, fstype, method, ) if method == "fallocate": cmd = ["fallocate", "-l", "%sM" % size, fname] elif method == "dd": cmd = [ "dd", "if=/dev/zero", "of=%s" % fname, "bs=1M", "count=%s" % size, ] try: subp.subp(cmd, capture=True) except subp.ProcessExecutionError as e: LOG.info(errmsg, fname, size, method, e) util.del_file(fname) raise swap_dir = os.path.dirname(fname) util.ensure_dir(swap_dir) fstype = util.get_mount_info(swap_dir)[1] if ( fstype == "xfs" and util.kernel_version() < (4, 18) ) or fstype == "btrfs": create_swap(fname, size, "dd") else: try: create_swap(fname, size, "fallocate") except subp.ProcessExecutionError: LOG.info("fallocate swap creation failed, will attempt with dd") create_swap(fname, size, "dd") if os.path.exists(fname): util.chmod(fname, 0o600) try: subp.subp(["mkswap", fname]) except subp.ProcessExecutionError: util.del_file(fname) raise def setup_swapfile(fname, size=None, maxsize=None): """ fname: full path string of filename to setup size: the size to create. set to "auto" for recommended maxsize: the maximum size """ swap_dir = os.path.dirname(fname) if str(size).lower() == "auto": try: memsize = util.read_meminfo()["total"] except IOError: LOG.debug("Not creating swap: failed to read meminfo") return util.ensure_dir(swap_dir) size = suggested_swapsize( fsys=swap_dir, maxsize=maxsize, memsize=memsize ) mibsize = str(int(size / (2**20))) if not size: LOG.debug("Not creating swap: suggested size was 0") return util.log_time( LOG.debug, msg="Setting up swap file", func=create_swapfile, args=[fname, mibsize], ) return fname def handle_swapcfg(swapcfg): """handle the swap config, calling setup_swap if necessary. return None or (filename, size) """ if not isinstance(swapcfg, dict): LOG.warning("input for swap config was not a dict.") return None fname = swapcfg.get("filename", "/swap.img") size = swapcfg.get("size", 0) maxsize = swapcfg.get("maxsize", None) if not (size and fname): LOG.debug("no need to setup swap") return if os.path.exists(fname): if not os.path.exists("/proc/swaps"): LOG.debug( "swap file %s exists, but no /proc/swaps exists, being safe", fname, ) return fname try: for line in util.load_file("/proc/swaps").splitlines(): if line.startswith(fname + " "): LOG.debug("swap file %s already in use", fname) return fname LOG.debug("swap file %s exists, but not in /proc/swaps", fname) except Exception: LOG.warning( "swap file %s exists. Error reading /proc/swaps", fname ) return fname try: if isinstance(size, str) and size != "auto": size = util.human2bytes(size) if isinstance(maxsize, str): maxsize = util.human2bytes(maxsize) return setup_swapfile(fname=fname, size=size, maxsize=maxsize) except Exception as e: LOG.warning("failed to setup swap: %s", e) return None def handle( name: str, cfg: Config, cloud: Cloud, log: Logger, args: list ) -> None: # fs_spec, fs_file, fs_vfstype, fs_mntops, fs-freq, fs_passno def_mnt_opts = "defaults,nobootwait" uses_systemd = cloud.distro.uses_systemd() if uses_systemd: def_mnt_opts = ( "defaults,nofail,x-systemd.requires=cloud-init.service,_netdev" ) defvals = [None, None, "auto", def_mnt_opts, "0", "2"] defvals = cfg.get("mount_default_fields", defvals) # these are our default set of mounts defmnts: list = [ ["ephemeral0", "/mnt", "auto", defvals[3], "0", "2"], ["swap", "none", "swap", "sw", "0", "0"], ] cfgmnt = [] if "mounts" in cfg: cfgmnt = cfg["mounts"] LOG.debug("mounts configuration is %s", cfgmnt) fstab_lines = [] fstab_devs = {} fstab_removed = [] if os.path.exists(FSTAB_PATH): for line in util.load_file(FSTAB_PATH).splitlines(): if MNT_COMMENT in line: fstab_removed.append(line) continue try: toks = WS.split(line) except Exception: pass fstab_devs[toks[0]] = line fstab_lines.append(line) device_aliases = cfg.get("device_aliases", {}) for i in range(len(cfgmnt)): # skip something that wasn't a list if not isinstance(cfgmnt[i], list): log.warning( "Mount option %s not a list, got a %s instead", (i + 1), type_utils.obj_name(cfgmnt[i]), ) continue start = str(cfgmnt[i][0]) sanitized = sanitize_devname( start, cloud.device_name_to_device, log, aliases=device_aliases ) if sanitized != start: log.debug("changed %s => %s" % (start, sanitized)) if sanitized is None: log.debug("Ignoring nonexistent named mount %s", start) continue elif sanitized in fstab_devs: log.info( "Device %s already defined in fstab: %s", sanitized, fstab_devs[sanitized], ) continue cfgmnt[i][0] = sanitized # in case the user did not quote a field (likely fs-freq, fs_passno) # but do not convert None to 'None' (LP: #898365) for j in range(len(cfgmnt[i])): if cfgmnt[i][j] is None: continue else: cfgmnt[i][j] = str(cfgmnt[i][j]) for i in range(len(cfgmnt)): # fill in values with defaults from defvals above for j in range(len(defvals)): if len(cfgmnt[i]) <= j: cfgmnt[i].append(defvals[j]) elif cfgmnt[i][j] is None: cfgmnt[i][j] = defvals[j] # if the second entry in the list is 'None' this # clears all previous entries of that same 'fs_spec' # (fs_spec is the first field in /etc/fstab, ie, that device) if cfgmnt[i][1] is None: for j in range(i): if cfgmnt[j][0] == cfgmnt[i][0]: cfgmnt[j][1] = None # for each of the "default" mounts, add them only if no other # entry has the same device name for defmnt in defmnts: start = defmnt[0] sanitized = sanitize_devname( start, cloud.device_name_to_device, log, aliases=device_aliases ) if sanitized != start: log.debug("changed default device %s => %s" % (start, sanitized)) if sanitized is None: log.debug("Ignoring nonexistent default named mount %s", start) continue elif sanitized in fstab_devs: log.debug( "Device %s already defined in fstab: %s", sanitized, fstab_devs[sanitized], ) continue defmnt[0] = sanitized cfgmnt_has = False for cfgm in cfgmnt: if cfgm[0] == defmnt[0]: cfgmnt_has = True break if cfgmnt_has: log.debug("Not including %s, already previously included", start) continue cfgmnt.append(defmnt) # now, each entry in the cfgmnt list has all fstab values # if the second field is None (not the string, the value) we skip it actlist = [] for x in cfgmnt: if x[1] is None: log.debug("Skipping nonexistent device named %s", x[0]) else: actlist.append(x) swapret = handle_swapcfg(cfg.get("swap", {})) if swapret: actlist.append([swapret, "none", "swap", "sw", "0", "0"]) if len(actlist) == 0: log.debug("No modifications to fstab needed") return cc_lines = [] needswap = False need_mount_all = False dirs = [] for line in actlist: # write 'comment' in the fs_mntops, entry, claiming this line[3] = "%s,%s" % (line[3], MNT_COMMENT) if line[2] == "swap": needswap = True if line[1].startswith("/"): dirs.append(line[1]) cc_lines.append("\t".join(line)) mount_points = [ v["mountpoint"] for k, v in util.mounts().items() if "mountpoint" in v ] for d in dirs: try: util.ensure_dir(d) except Exception: util.logexc(log, "Failed to make '%s' config-mount", d) # dirs is list of directories on which a volume should be mounted. # If any of them does not already show up in the list of current # mount points, we will definitely need to do mount -a. if not need_mount_all and d not in mount_points: need_mount_all = True sadds = [WS.sub(" ", n) for n in cc_lines] sdrops = [WS.sub(" ", n) for n in fstab_removed] sops = ["- " + drop for drop in sdrops if drop not in sadds] + [ "+ " + add for add in sadds if add not in sdrops ] fstab_lines.extend(cc_lines) contents = "%s\n" % "\n".join(fstab_lines) util.write_file(FSTAB_PATH, contents) activate_cmds = [] if needswap: activate_cmds.append(["swapon", "-a"]) if len(sops) == 0: log.debug("No changes to /etc/fstab made.") else: log.debug("Changes to fstab: %s", sops) need_mount_all = True if need_mount_all: activate_cmds.append(["mount", "-a"]) if uses_systemd: activate_cmds.append(["systemctl", "daemon-reload"]) fmt = "Activating swap and mounts with: %s" for cmd in activate_cmds: fmt = "Activate mounts: %s:" + " ".join(cmd) try: subp.subp(cmd) log.debug(fmt, "PASS") except subp.ProcessExecutionError: log.warning(fmt, "FAIL") util.logexc(log, fmt, "FAIL") # 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