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Database: make constructor safe for read-only filesystems (#48454)

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`spack find` and other commands that read the DB will fail if the databse is in a
read-only location, because `FailureTracker` and `Database` can try to create their
parent directories when they are constructed, even if the DB root is read-only.

Instead, we should only write to the filesystem when needed.

- [x] don't create parent directories in constructors
- [x] have write operations create parents if needed
- [x] in tests, `chmod` databases to be read-only unless absolutely needed.

---------

Signed-off-by: Todd Gamblin <tgamblin@llnl.gov>
This commit is contained in:
Todd Gamblin
2025-01-14 00:10:51 -08:00
committed by GitHub
parent 53d1665a8b
commit d89ae7bcde
4 changed files with 147 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
lib/spack/spack/binary_distribution.py
View File

@@ -23,7 +23,7 @@
import urllib.request
import warnings
from contextlib import closing
from typing import IO, Dict, Iterable, List, NamedTuple, Optional, Set, Tuple, Union
from typing import IO, Callable, Dict, Iterable, List, NamedTuple, Optional, Set, Tuple, Union
import llnl.util.filesystem as fsys
import llnl.util.lang
@@ -669,19 +669,24 @@ def sign_specfile(key: str, specfile_path: str) -> str:
def _read_specs_and_push_index(
file_list, read_method, cache_prefix, db: BuildCacheDatabase, temp_dir, concurrency
file_list: List[str],
read_method: Callable,
cache_prefix: str,
db: BuildCacheDatabase,
temp_dir: str,
concurrency: int,
):
"""Read all the specs listed in the provided list, using thread given thread parallelism,
generate the index, and push it to the mirror.
Args:
file_list (list(str)): List of urls or file paths pointing at spec files to read
file_list: List of urls or file paths pointing at spec files to read
read_method: A function taking a single argument, either a url or a file path,
and which reads the spec file at that location, and returns the spec.
cache_prefix (str): prefix of the build cache on s3 where index should be pushed.
cache_prefix: prefix of the build cache on s3 where index should be pushed.
db: A spack database used for adding specs and then writing the index.
temp_dir (str): Location to write index.json and hash for pushing
concurrency (int): Number of parallel processes to use when fetching
temp_dir: Location to write index.json and hash for pushing
concurrency: Number of parallel processes to use when fetching
"""
for file in file_list:
contents = read_method(file)
@@ -861,9 +866,12 @@ def _url_generate_package_index(url: str, tmpdir: str, concurrency: int = 32):
tty.debug(f"Retrieving spec descriptor files from {url} to build index")
db = BuildCacheDatabase(tmpdir)
db._write()
try:
_read_specs_and_push_index(file_list, read_fn, url, db, db.database_directory, concurrency)
_read_specs_and_push_index(
file_list, read_fn, url, db, str(db.database_directory), concurrency
)
except Exception as e:
raise GenerateIndexError(f"Encountered problem pushing package index to {url}: {e}") from e

73
lib/spack/spack/database.py
View File

@@ -419,14 +419,25 @@ class FailureTracker:
the likelihood of collision very low with no cleanup required.
"""
#: root directory of the failure tracker
dir: pathlib.Path
#: File for locking particular concrete spec hashes
locker: SpecLocker
def __init__(self, root_dir: Union[str, pathlib.Path], default_timeout: Optional[float]):
#: Ensure a persistent location for dealing with parallel installation
#: failures (e.g., across near-concurrent processes).
self.dir = pathlib.Path(root_dir) / _DB_DIRNAME / "failures"
self.dir.mkdir(parents=True, exist_ok=True)
self.locker = SpecLocker(failures_lock_path(root_dir), default_timeout=default_timeout)
def _ensure_parent_directories(self) -> None:
"""Ensure that parent directories of the FailureTracker exist.
Accesses the filesystem only once, the first time it's called on a given FailureTracker.
"""
self.dir.mkdir(parents=True, exist_ok=True)
def clear(self, spec: "spack.spec.Spec", force: bool = False) -> None:
"""Removes any persistent and cached failure tracking for the spec.
@@ -469,13 +480,18 @@ def clear_all(self) -> None:
tty.debug("Removing prefix failure tracking files")
try:
for fail_mark in os.listdir(str(self.dir)):
try:
(self.dir / fail_mark).unlink()
except OSError as exc:
tty.warn(f"Unable to remove failure marking file {fail_mark}: {str(exc)}")
marks = os.listdir(str(self.dir))
except FileNotFoundError:
return # directory doesn't exist yet
except OSError as exc:
tty.warn(f"Unable to remove failure marking files: {str(exc)}")
return
for fail_mark in marks:
try:
(self.dir / fail_mark).unlink()
except OSError as exc:
tty.warn(f"Unable to remove failure marking file {fail_mark}: {str(exc)}")
def mark(self, spec: "spack.spec.Spec") -> lk.Lock:
"""Marks a spec as failing to install.
@@ -483,6 +499,8 @@ def mark(self, spec: "spack.spec.Spec") -> lk.Lock:
Args:
spec: spec that failed to install
"""
self._ensure_parent_directories()
# Dump the spec to the failure file for (manual) debugging purposes
path = self._path(spec)
path.write_text(spec.to_json())
@@ -567,17 +585,13 @@ def __init__(
Relevant only if the repository is not an upstream.
"""
self.root = root
self.database_directory = os.path.join(self.root, _DB_DIRNAME)
self.database_directory = pathlib.Path(self.root) / _DB_DIRNAME
self.layout = layout
# Set up layout of database files within the db dir
self._index_path = os.path.join(self.database_directory, "index.json")
self._verifier_path = os.path.join(self.database_directory, "index_verifier")
self._lock_path = os.path.join(self.database_directory, "lock")
# Create needed directories and files
if not is_upstream and not os.path.exists(self.database_directory):
fs.mkdirp(self.database_directory)
self._index_path = self.database_directory / "index.json"
self._verifier_path = self.database_directory / "index_verifier"
self._lock_path = self.database_directory / "lock"
self.is_upstream = is_upstream
self.last_seen_verifier = ""
@@ -599,7 +613,7 @@ def __init__(
self.lock = ForbiddenLock()
else:
self.lock = lk.Lock(
self._lock_path,
str(self._lock_path),
default_timeout=self.db_lock_timeout,
desc="database",
enable=lock_cfg.enable,
@@ -616,6 +630,11 @@ def __init__(
self._write_transaction_impl = lk.WriteTransaction
self._read_transaction_impl = lk.ReadTransaction
def _ensure_parent_directories(self):
"""Create the parent directory for the DB, if necessary."""
if not self.is_upstream:
self.database_directory.mkdir(parents=True, exist_ok=True)
def write_transaction(self):
"""Get a write lock context manager for use in a `with` block."""
return self._write_transaction_impl(self.lock, acquire=self._read, release=self._write)
@@ -630,6 +649,8 @@ def _write_to_file(self, stream):
This function does not do any locking or transactions.
"""
self._ensure_parent_directories()
# map from per-spec hash code to installation record.
installs = dict(
(k, v.to_dict(include_fields=self.record_fields)) for k, v in self._data.items()
@@ -759,7 +780,7 @@ def _read_from_file(self, filename):
Does not do any locking.
"""
try:
with open(filename, "r", encoding="utf-8") as f:
with open(str(filename), "r", encoding="utf-8") as f:
# In the future we may use a stream of JSON objects, hence `raw_decode` for compat.
fdata, _ = JSONDecoder().raw_decode(f.read())
except Exception as e:
@@ -860,11 +881,13 @@ def reindex(self):
if self.is_upstream:
raise UpstreamDatabaseLockingError("Cannot reindex an upstream database")
self._ensure_parent_directories()
# Special transaction to avoid recursive reindex calls and to
# ignore errors if we need to rebuild a corrupt database.
def _read_suppress_error():
try:
if os.path.isfile(self._index_path):
if self._index_path.is_file():
self._read_from_file(self._index_path)
except CorruptDatabaseError as e:
tty.warn(f"Reindexing corrupt database, error was: {e}")
@@ -1007,7 +1030,7 @@ def _check_ref_counts(self):
% (key, found, expected, self._index_path)
)
def _write(self, type, value, traceback):
def _write(self, type=None, value=None, traceback=None):
"""Write the in-memory database index to its file path.
This is a helper function called by the WriteTransaction context
@@ -1018,6 +1041,8 @@ def _write(self, type, value, traceback):
This routine does no locking.
"""
self._ensure_parent_directories()
# Do not write if exceptions were raised
if type is not None:
# A failure interrupted a transaction, so we should record that
@@ -1026,16 +1051,16 @@ def _write(self, type, value, traceback):
self._state_is_inconsistent = True
return
temp_file = self._index_path + (".%s.%s.temp" % (_getfqdn(), os.getpid()))
temp_file = str(self._index_path) + (".%s.%s.temp" % (_getfqdn(), os.getpid()))
# Write a temporary database file them move it into place
try:
with open(temp_file, "w", encoding="utf-8") as f:
self._write_to_file(f)
fs.rename(temp_file, self._index_path)
fs.rename(temp_file, str(self._index_path))
if _use_uuid:
with open(self._verifier_path, "w", encoding="utf-8") as f:
with self._verifier_path.open("w", encoding="utf-8") as f:
new_verifier = str(uuid.uuid4())
f.write(new_verifier)
self.last_seen_verifier = new_verifier
@@ -1048,11 +1073,11 @@ def _write(self, type, value, traceback):
def _read(self):
"""Re-read Database from the data in the set location. This does no locking."""
if os.path.isfile(self._index_path):
if self._index_path.is_file():
current_verifier = ""
if _use_uuid:
try:
with open(self._verifier_path, "r", encoding="utf-8") as f:
with self._verifier_path.open("r", encoding="utf-8") as f:
current_verifier = f.read()
except BaseException:
pass

22
lib/spack/spack/test/conftest.py
View File

@@ -887,21 +887,26 @@ def mock_store(
"""
store_path, store_cache = _store_dir_and_cache
# Make the DB filesystem read-only to ensure constructors don't modify anything in it.
# We want Spack to be able to point to a DB on a read-only filesystem easily.
store_path.chmod(mode=0o555, rec=1)
# If the cache does not exist populate the store and create it
if not os.path.exists(str(store_cache.join(".spack-db"))):
with spack.config.use_configuration(*mock_configuration_scopes):
with spack.store.use_store(str(store_path)) as store:
with spack.repo.use_repositories(mock_repo_path):
# make the DB filesystem writable only while we populate it
store_path.chmod(mode=0o755, rec=1)
_populate(store.db)
copy_tree(str(store_path), str(store_cache))
store_path.chmod(mode=0o555, rec=1)
# Make the DB filesystem read-only to ensure we can't modify entries
store_path.join(".spack-db").chmod(mode=0o555, rec=1)
store_cache.chmod(mode=0o755, rec=1)
copy_tree(str(store_path), str(store_cache))
store_cache.chmod(mode=0o555, rec=1)
yield store_path
store_path.join(".spack-db").chmod(mode=0o755, rec=1)
@pytest.fixture(scope="function")
def database(mock_store, mock_packages, config):
@@ -927,7 +932,7 @@ def mutable_database(database_mutable_config, _store_dir_and_cache):
"""
# Make the database writeable, as we are going to modify it
store_path, store_cache = _store_dir_and_cache
store_path.join(".spack-db").chmod(mode=0o755, rec=1)
store_path.chmod(mode=0o755, rec=1)
yield database_mutable_config
@@ -935,7 +940,7 @@ def mutable_database(database_mutable_config, _store_dir_and_cache):
# the store and making the database read-only
store_path.remove(rec=1)
copy_tree(str(store_cache), str(store_path))
store_path.join(".spack-db").chmod(mode=0o555, rec=1)
store_path.chmod(mode=0o555, rec=1)
@pytest.fixture()
@@ -1039,7 +1044,8 @@ def temporary_store(tmpdir, request):
temporary_store_path = tmpdir.join("opt")
with spack.store.use_store(str(temporary_store_path)) as s:
yield s
temporary_store_path.remove()
if temporary_store_path.exists():
temporary_store_path.remove()
@pytest.fixture()

101
lib/spack/spack/test/database.py
View File

@@ -2,10 +2,12 @@
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""Check the database is functioning properly, both in memory and in its file."""
import contextlib
import datetime
import functools
import json
import os
import pathlib
import re
import shutil
import sys
@@ -32,6 +34,7 @@
import spack.repo
import spack.spec
import spack.store
import spack.util.lock
import spack.version as vn
from spack.enums import InstallRecordStatus
from spack.installer import PackageInstaller
@@ -41,24 +44,51 @@
pytestmark = pytest.mark.db
@contextlib.contextmanager
def writable(database):
"""Allow a database to be written inside this context manager."""
old_lock, old_is_upstream = database.lock, database.is_upstream
db_root = pathlib.Path(database.root)
try:
# this is safe on all platforms during tests (tests get their own tmpdirs)
database.lock = spack.util.lock.Lock(str(database._lock_path), enable=False)
database.is_upstream = False
db_root.chmod(mode=0o755)
with database.write_transaction():
yield
finally:
db_root.chmod(mode=0o555)
database.lock = old_lock
database.is_upstream = old_is_upstream
@pytest.fixture()
def upstream_and_downstream_db(tmpdir, gen_mock_layout):
mock_db_root = str(tmpdir.mkdir("mock_db_root"))
upstream_layout = gen_mock_layout("/a/")
upstream_write_db = spack.database.Database(mock_db_root, layout=upstream_layout)
upstream_db = spack.database.Database(mock_db_root, is_upstream=True, layout=upstream_layout)
# Generate initial DB file to avoid reindex
with open(upstream_write_db._index_path, "w", encoding="utf-8") as db_file:
upstream_write_db._write_to_file(db_file)
"""Fixture for a pair of stores: upstream and downstream.
downstream_db_root = str(tmpdir.mkdir("mock_downstream_db_root"))
downstream_db = spack.database.Database(
downstream_db_root, upstream_dbs=[upstream_db], layout=gen_mock_layout("/b/")
Upstream API prohibits writing to an upstream, so we also return a writable version
of the upstream DB for tests to use.
"""
mock_db_root = tmpdir.mkdir("mock_db_root")
mock_db_root.chmod(0o555)
upstream_db = spack.database.Database(
str(mock_db_root), is_upstream=True, layout=gen_mock_layout("/a/")
)
with open(downstream_db._index_path, "w", encoding="utf-8") as db_file:
downstream_db._write_to_file(db_file)
with writable(upstream_db):
upstream_db._write()
yield upstream_write_db, upstream_db, downstream_db
downstream_db_root = tmpdir.mkdir("mock_downstream_db_root")
downstream_db_root.chmod(0o755)
downstream_db = spack.database.Database(
str(downstream_db_root), upstream_dbs=[upstream_db], layout=gen_mock_layout("/b/")
)
downstream_db._write()
yield upstream_db, downstream_db
@pytest.mark.parametrize(
@@ -70,16 +100,18 @@ def upstream_and_downstream_db(tmpdir, gen_mock_layout):
("{u}", ["pkg-c"]),
("{d}", ["pkg-b"]),
],
ids=["all", "upstream", "local", "upstream_path", "downstream_path"],
)
def test_query_by_install_tree(
install_tree, result, upstream_and_downstream_db, mock_packages, monkeypatch, config
):
up_write_db, up_db, down_db = upstream_and_downstream_db
up_db, down_db = upstream_and_downstream_db
# Set the upstream DB to contain "pkg-c" and downstream to contain "pkg-b")
b = spack.spec.Spec("pkg-b").concretized()
c = spack.spec.Spec("pkg-c").concretized()
up_write_db.add(c)
with writable(up_db):
up_db.add(c)
up_db._read()
down_db.add(b)
@@ -91,7 +123,7 @@ def test_spec_installed_upstream(
upstream_and_downstream_db, mock_custom_repository, config, monkeypatch
):
"""Test whether Spec.installed_upstream() works."""
upstream_write_db, upstream_db, downstream_db = upstream_and_downstream_db
upstream_db, downstream_db = upstream_and_downstream_db
# a known installed spec should say that it's installed
with spack.repo.use_repositories(mock_custom_repository):
@@ -99,7 +131,8 @@ def test_spec_installed_upstream(
assert not spec.installed
assert not spec.installed_upstream
upstream_write_db.add(spec)
with writable(upstream_db):
upstream_db.add(spec)
upstream_db._read()
monkeypatch.setattr(spack.store.STORE, "db", downstream_db)
@@ -115,7 +148,7 @@ def test_spec_installed_upstream(
@pytest.mark.usefixtures("config")
def test_installed_upstream(upstream_and_downstream_db, tmpdir):
upstream_write_db, upstream_db, downstream_db = upstream_and_downstream_db
upstream_db, downstream_db = upstream_and_downstream_db
builder = spack.repo.MockRepositoryBuilder(tmpdir.mkdir("mock.repo"))
builder.add_package("x")
@@ -125,8 +158,9 @@ def test_installed_upstream(upstream_and_downstream_db, tmpdir):
with spack.repo.use_repositories(builder.root):
spec = spack.spec.Spec("w").concretized()
for dep in spec.traverse(root=False):
upstream_write_db.add(dep)
with writable(upstream_db):
for dep in spec.traverse(root=False):
upstream_db.add(dep)
upstream_db._read()
for dep in spec.traverse(root=False):
@@ -150,7 +184,7 @@ def test_installed_upstream(upstream_and_downstream_db, tmpdir):
def test_removed_upstream_dep(upstream_and_downstream_db, tmpdir, capsys, config):
upstream_write_db, upstream_db, downstream_db = upstream_and_downstream_db
upstream_db, downstream_db = upstream_and_downstream_db
builder = spack.repo.MockRepositoryBuilder(tmpdir.mkdir("mock.repo"))
builder.add_package("z")
@@ -161,12 +195,14 @@ def test_removed_upstream_dep(upstream_and_downstream_db, tmpdir, capsys, config
z = y["z"]
# add dependency to upstream, dependents to downstream
upstream_write_db.add(z)
with writable(upstream_db):
upstream_db.add(z)
upstream_db._read()
downstream_db.add(y)
# remove the dependency from the upstream DB
upstream_write_db.remove(z)
with writable(upstream_db):
upstream_db.remove(z)
upstream_db._read()
# then rereading the downstream DB should warn about the missing dep
@@ -183,7 +219,7 @@ def test_add_to_upstream_after_downstream(upstream_and_downstream_db, tmpdir):
DB. When a package is recorded as installed in both, the results should
refer to the downstream DB.
"""
upstream_write_db, upstream_db, downstream_db = upstream_and_downstream_db
upstream_db, downstream_db = upstream_and_downstream_db
builder = spack.repo.MockRepositoryBuilder(tmpdir.mkdir("mock.repo"))
builder.add_package("x")
@@ -192,7 +228,8 @@ def test_add_to_upstream_after_downstream(upstream_and_downstream_db, tmpdir):
spec = spack.spec.Spec("x").concretized()
downstream_db.add(spec)
upstream_write_db.add(spec)
with writable(upstream_db):
upstream_db.add(spec)
upstream_db._read()
upstream, record = downstream_db.query_by_spec_hash(spec.dag_hash())
@@ -843,7 +880,7 @@ def test_query_virtual_spec(database):
assert all(name in names for name in ["mpich", "mpich2", "zmpi"])
def test_failed_spec_path_error(database):
def test_failed_spec_path_error(mutable_database):
"""Ensure spec not concrete check is covered."""
s = spack.spec.Spec("pkg-a")
with pytest.raises(AssertionError, match="concrete spec required"):
@@ -950,7 +987,7 @@ def test_database_works_with_empty_dir(tmpdir):
db_dir = tmpdir.ensure_dir(".spack-db")
db_dir.ensure("lock")
db_dir.ensure_dir("failures")
tmpdir.chmod(mode=0o555, rec=1)
tmpdir.chmod(mode=0o555)
db = spack.database.Database(str(tmpdir))
with db.read_transaction():
db.query()
@@ -1105,6 +1142,8 @@ def test_error_message_when_using_too_new_db(database, monkeypatch):
def test_database_construction_doesnt_use_globals(tmpdir, config, nullify_globals, lock_cfg):
lock_cfg = lock_cfg or spack.database.lock_configuration(config)
db = spack.database.Database(str(tmpdir), lock_cfg=lock_cfg)
with db.write_transaction():
pass # ensure the DB is written
assert os.path.exists(db.database_directory)
@@ -1125,15 +1164,13 @@ def test_database_read_works_with_trailing_data(tmp_path, default_mock_concretiz
assert spack.database.Database(root).query_local() == specs_in_db
def test_database_errors_with_just_a_version_key(tmp_path):
root = str(tmp_path)
db = spack.database.Database(root)
def test_database_errors_with_just_a_version_key(mutable_database):
next_version = f"{spack.database._DB_VERSION}.next"
with open(db._index_path, "w", encoding="utf-8") as f:
with open(mutable_database._index_path, "w", encoding="utf-8") as f:
f.write(json.dumps({"database": {"version": next_version}}))
with pytest.raises(spack.database.InvalidDatabaseVersionError):
spack.database.Database(root).query_local()
spack.database.Database(mutable_database.root).query_local()
def test_reindex_with_upstreams(tmp_path, monkeypatch, mock_packages, config):