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Fstab handling moves to blivet
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Anaconda handling fstab is something that should be done by blivet.
This moves the fstab logic into the blivet. Crypttab and blkidtab
handling is not supported by blivet yet so it remains mostly unchanged
(for now)

Added unit_tests
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@japokorn
japokorn committed Jul 31, 2024
1 parent ffd8065 commit cf4ab09
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232 changes: 48 additions & 184 deletions pyanaconda/modules/storage/devicetree/fsset.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import time

from blivet import blockdev
from blivet.fstab import FSTabManager
from blivet.devices import NoDevice, DirectoryDevice, NFSDevice, FileDevice, MDRaidArrayDevice, \
NetworkStorageDevice, OpticalDevice
from blivet.errors import UnrecognizedFSTabEntryError, FSTabTypeMismatchError, SwapSpaceError
Expand Down Expand Up @@ -307,7 +308,7 @@ def __init__(self, devicetree):
self.blkid_tab = None
self._fstab_swaps = set()
self._system_filesystems = []
self.preserve_lines = [] # lines we just ignore and preserve
self.preserve_entries = [] # unrecognized or ignored entries in fstab (blivet.fstab.FSTabEntry)

@property
def system_filesystems(self):
Expand All @@ -326,134 +327,17 @@ def devices(self):
def mountpoints(self):
return self.devicetree.mountpoints

def _parse_one_line(self, devspec, mountpoint, fstype, options, _dump="0", _passno="0"):
"""Parse an fstab entry for a device, return the corresponding device.
The parameters correspond to the items in a single entry in the
order in which they occur in the entry.
:return: the device corresponding to the entry
:rtype: :class:`blivet.devices.Device`
"""

# no sense in doing any legwork for a noauto entry
if "noauto" in options.split(","):
log.info("ignoring noauto entry")
raise UnrecognizedFSTabEntryError()

# find device in the tree
device = self.devicetree.resolve_device(devspec,
crypt_tab=self.crypt_tab,
blkid_tab=self.blkid_tab,
options=options)

if device:
# fall through to the bottom of this block
pass
elif devspec.startswith("/dev/loop"):
# FIXME: create devices.LoopDevice
log.warning("completely ignoring your loop mount")
elif ":" in devspec and fstype.startswith("nfs"):
# NFS -- preserve but otherwise ignore
device = NFSDevice(devspec,
fmt=get_format(fstype,
exists=True,
device=devspec))
elif devspec.startswith("/") and fstype == "swap":
# swap file
device = FileDevice(devspec,
parents=get_containing_device(devspec, self.devicetree),
fmt=get_format(fstype,
device=devspec,
exists=True),
exists=True)
elif fstype == "bind" or "bind" in options:
# bind mount... set fstype so later comparison won't
# turn up false positives
fstype = "bind"

# This is probably not going to do anything useful, so we'll
# make sure to try again from FSSet.mount_filesystems. The bind
# mount targets should be accessible by the time we try to do
# the bind mount from there.
parents = get_containing_device(devspec, self.devicetree)
device = DirectoryDevice(devspec, parents=parents, exists=True)
device.format = get_format("bind",
device=device.path,
exists=True)
elif mountpoint in ("/proc", "/sys", "/dev/shm", "/dev/pts",
"/sys/fs/selinux", "/proc/bus/usb", "/sys/firmware/efi/efivars"):
# drop these now -- we'll recreate later
return None
else:
# nodev filesystem -- preserve or drop completely?
fmt = get_format(fstype)
fmt_class = get_device_format_class("nodev")
if devspec == "none" or \
(fmt_class and isinstance(fmt, fmt_class)):
device = NoDevice(fmt=fmt)

if device is None:
log.error("failed to resolve %s (%s) from fstab", devspec,
fstype)
raise UnrecognizedFSTabEntryError()

device.setup()
fmt = get_format(fstype, device=device.path, exists=True)
if fstype != "auto" and None in (device.format.type, fmt.type):
log.info("Unrecognized filesystem type for %s (%s)",
device.name, fstype)
device.teardown()
raise UnrecognizedFSTabEntryError()

# make sure, if we're using a device from the tree, that
# the device's format we found matches what's in the fstab
ftype = getattr(fmt, "mount_type", fmt.type)
dtype = getattr(device.format, "mount_type", device.format.type)
if hasattr(fmt, "test_mount") and fstype != "auto" and ftype != dtype:
log.info("fstab says %s at %s is %s", dtype, mountpoint, ftype)
if fmt.test_mount(): # pylint: disable=no-member
device.format = fmt
else:
device.teardown()
raise FSTabTypeMismatchError(_(
"There is an entry in your /etc/fstab file that contains "
"an invalid or incorrect file system type. The file says that "
"{detected_type} at {mount_point} is {fstab_type}.").format(
detected_type=dtype,
mount_point=mountpoint,
fstab_type=ftype
))

del ftype
del dtype

if hasattr(device.format, "mountpoint"):
device.format.mountpoint = mountpoint

device.format.options = options

return device

def parse_fstab(self, chroot=None):
"""Parse /etc/fstab.
preconditions:
all storage devices have been scanned, including filesystems
FIXME: control which exceptions we raise
XXX do we care about bind mounts?
how about nodev mounts?
loop mounts?
""" Process fstab. Devices in there but not in devicetree are added into it.
Unrecognized fstab entries are stored so they can be preserved
"""

if not chroot or not os.path.isdir(chroot):
chroot = conf.target.system_root

path = "%s/etc/fstab" % chroot
if not os.access(path, os.R_OK):
# XXX should we raise an exception instead?
log.info("cannot open %s for read", path)
fstab_path = "%s/etc/fstab" % chroot
if not os.access(fstab_path, os.R_OK):
log.info("cannot open %s for read", fstab_path)
return

blkid_tab = BlkidTab(chroot=chroot)
Expand All @@ -475,35 +359,22 @@ def parse_fstab(self, chroot=None):
self.blkid_tab = blkid_tab
self.crypt_tab = crypt_tab

with open(path) as f:
log.debug("parsing %s", path)

lines = f.readlines()

for line in lines:

(line, _pound, _comment) = line.partition("#")
fields = line.split()
fstab = FSTabManager(src_file=fstab_path)
fstab.read()

if not 4 <= len(fields) <= 6:
continue
for entry in fstab:
try:
device = fstab.get_device(self.devicetree, entry=entry)
except UnrecognizedFSTabEntryError:
self.preserve_entries.append(entry)
continue

if device not in self.devicetree.devices:
try:
device = self._parse_one_line(*fields)
except UnrecognizedFSTabEntryError:
# just write the line back out as-is after upgrade
self.preserve_lines.append(line)
continue

if not device:
continue
self.devicetree._add_device(device)
except ValueError:
self.preserve_entries.append(entry)

if device not in self.devicetree.devices:
try:
self.devicetree._add_device(device)
except ValueError:
# just write duplicates back out post-install
self.preserve_lines.append(line)

def turn_on_swap(self, root_path=""):
"""Activate the system's swap space."""
Expand Down Expand Up @@ -643,9 +514,8 @@ def write(self):
"""Write out all config files based on the set of filesystems."""
sysroot = conf.target.system_root
# /etc/fstab
fstab_path = os.path.normpath("%s/etc/fstab" % sysroot)
fstab = self.fstab()
open(fstab_path, "w").write(fstab)
fstab.write(dest_file=os.path.normpath("%s/etc/fstab" % sysroot))

# /etc/crypttab
crypttab_path = os.path.normpath("%s/etc/crypttab" % sysroot)
Expand Down Expand Up @@ -718,8 +588,10 @@ def mdadm_conf(self):
return content

def fstab(self):
fmt_str = "%-23s %-23s %-7s %-15s %d %d\n"
fstab = """
""" Create a FSTabManager object, fill it with current devices
and return it as a result to be written
"""
intro_comment = """
#
# /etc/fstab
# Created by anaconda on %s
Expand All @@ -743,6 +615,10 @@ def fstab(self):
rootdev = devices[0]
root_on_netdev = any(rootdev.depends_on(netdev) for netdev in netdevs)

fstab = FSTabManager(src_file=None, dest_file=None)

fstab._table.intro_comment = intro_comment

for device in devices:
# why the hell do we put swap in the fstab, anyway?
if not device.format.mountable and device.format.type != "swap":
Expand All @@ -752,43 +628,31 @@ def fstab(self):
if isinstance(device, OpticalDevice):
continue

fstype = getattr(device.format, "mount_type", device.format.type)
if fstype == "swap":
mountpoint = "none"
options = device.format.options
else:
mountpoint = device.format.mountpoint
options = device.format.options
if not mountpoint:
log.warning("%s filesystem on %s has no mount point",
fstype,
device.path)
continue
try:
new_entry = fstab.entry_from_device(device)
except ValueError:
fstype = getattr(device.format, "mount_type", device.format.type)
log.warning("%s filesystem on %s has no mount point",
fstype,
device.path) # legacy warning message # TODO change to e.msg?
continue

options = options or "defaults"
for netdev in netdevs:
if device.depends_on(netdev):
if root_on_netdev and mountpoint == "/var":
options = options + ",x-initrd.mount"
if root_on_netdev and new_entry.file == "/var":
new_entry.mntops_add("x-initrd.mount")
break

if device.encrypted:
options += ",x-systemd.device-timeout=0"
devspec = device.fstab_spec
dump = device.format.dump
if device.format.check and mountpoint == "/":
passno = 1
elif device.format.check:
passno = 2
else:
passno = 0
fstab = fstab + device.fstab_comment
fstab = fstab + fmt_str % (devspec, mountpoint, fstype,
options, dump, passno)

# now, write out any lines we were unable to process because of
new_entry.mntops_add("x-systemd.device-timeout=0")

new_entry.comment = device.fstab_comment
fstab.add_entry(entry=new_entry)

# now, write out any entries we were unable to process because of
# unrecognized filesystems or unresolvable device specifications
for line in self.preserve_lines:
fstab += line
for preserved_entry in self.preserve_entries:
fstab.add_entry(entry=preserved_entry)

return fstab

Expand Down
53 changes: 20 additions & 33 deletions pyanaconda/modules/storage/devicetree/root.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import shlex

from blivet import util as blivet_util
from blivet.fstab import FSTabManager
from blivet.errors import StorageError
from blivet.storage_log import log_exception_info

Expand Down Expand Up @@ -251,13 +252,13 @@ def _parse_fstab(devicetree, chroot):
:param chroot: a path to the target OS installation
:return: a tuple of a mount dict and a device list
"""
mounts = {}
devices = []

path = "%s/etc/fstab" % chroot
if not os.access(path, os.R_OK):
# XXX should we raise an exception instead?
log.info("cannot open %s for read", path)
mounts = dict()
devices = list()

fstab_path = "%s/etc/fstab" % chroot
if not os.access(fstab_path, os.R_OK):
log.info("cannot open %s for read", fstab_path)
return mounts, devices

blkid_tab = BlkidTab(chroot=chroot)
Expand All @@ -276,38 +277,24 @@ def _parse_fstab(devicetree, chroot):
log_exception_info(log.info, "error parsing crypttab")
crypt_tab = None

with open(path) as f:
log.debug("parsing %s", path)
for line in f.readlines():

(line, _pound, _comment) = line.partition("#")
fields = line.split(None, 4)

if len(fields) < 5:
continue
fstab = FSTabManager(src_file=fstab_path)
fstab.read()

(devspec, mountpoint, fstype, options, _rest) = fields
for entry in fstab:

# find device in the tree
device = devicetree.resolve_device(
devspec,
crypt_tab=crypt_tab,
blkid_tab=blkid_tab,
options=options
)

if device is None:
continue
device = fstab.find_device(devicetree, entry=entry)
if device is None:
continue

# If a btrfs volume is found but a subvolume is expected, ignore the volume.
if device.type == "btrfs volume" and "subvol=" in options:
log.debug("subvolume from %s for %s not found", options, devspec)
continue
# If a btrfs volume is found but a subvolume is expected, ignore the volume.
if device.type == "btrfs volume" and "subvol=" in options:
log.debug("subvolume from %s for %s not found", options, devspec)
continue

if fstype != "swap":
mounts[mountpoint] = device
if entry.vfstype != "swap":
mounts[entry.file] = device

devices.append(device)
devices.append(device)

return mounts, devices

Expand Down
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