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add option ENFORCE_ATOMIC_WRITES to allow disabling forced FSYNC writes on network drives

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Nick Sweeting 2021-05-31 19:31:11 -04:00
parent e529f550d8
commit 1112526543
2 changed files with 18 additions and 7 deletions
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24
archivebox/system.py
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@ -14,7 +14,7 @@ from crontab import CronTab
from .vendor.atomicwrites import atomic_write as lib_atomic_write
from .util import enforce_types, ExtendedEncoder
from .config import PYTHON_BINARY, OUTPUT_PERMISSIONS
from .config import PYTHON_BINARY, OUTPUT_PERMISSIONS, ENFORCE_ATOMIC_WRITES
@ -78,7 +78,7 @@ def run(cmd, *args, input=None, capture_output=True, timeout=None, check=False,
@enforce_types
def atomic_write(path: Union[Path, str], contents: Union[dict, str, bytes], overwrite: bool=True) -> None:
def atomic_write(path: Union[Path, str], contents: Union[dict, str, bytes], overwrite: bool=True, permissions: str=OUTPUT_PERMISSIONS) -> None:
"""Safe atomic write to filesystem by writing to temp file + atomic rename"""
mode = 'wb+' if isinstance(contents, bytes) else 'w'
@ -92,11 +92,21 @@ def atomic_write(path: Union[Path, str], contents: Union[dict, str, bytes], over
elif isinstance(contents, (bytes, str)):
f.write(contents)
except OSError as e:
print(f"[X] OSError: Failed to write {path} with fcntl.F_FULLFSYNC. ({e})")
print(" You can store the archive/ subfolder on a hard drive or network share that doesn't support support syncronous writes,")
print(" but the main folder containing the index.sqlite3 and ArchiveBox.conf files must be on a filesystem that supports FSYNC.")
raise SystemExit(1)
os.chmod(path, int(OUTPUT_PERMISSIONS, base=8))
if ENFORCE_ATOMIC_WRITES:
print(f"[X] OSError: Failed to write {path} with fcntl.F_FULLFSYNC. ({e})")
print(" You can store the archive/ subfolder on a hard drive or network share that doesn't support support syncronous writes,")
print(" but the main folder containing the index.sqlite3 and ArchiveBox.conf files must be on a filesystem that supports FSYNC.")
raise SystemExit(1)
# retry the write without forcing FSYNC (aka atomic mode)
with open(path, mode=mode, encoding=encoding) as f:
if isinstance(contents, dict):
dump(contents, f, indent=4, sort_keys=True, cls=ExtendedEncoder)
elif isinstance(contents, (bytes, str)):
f.write(contents)
# set permissions
os.chmod(path, int(permissions, base=8))
@enforce_types
def chmod_file(path: str, cwd: str='.', permissions: str=OUTPUT_PERMISSIONS) -> None: