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'''
mkfs.py - this file is part of S3QL.
Copyright © 2008 Nikolaus Rath <Nikolaus@rath.org>
This work can be distributed under the terms of the GNU GPLv3.
'''
from .logging import logging, setup_logging, QuietError
from . import CURRENT_FS_REV, CTRL_INODE, ROOT_INODE
from .backends.comprenc import ComprencBackend
from .backends import s3
from .common import (get_backend_cachedir, get_backend, split_by_n,
freeze_basic_mapping, time_ns)
from .database import Connection
from .metadata import dump_and_upload_metadata, create_tables
from .parse_args import ArgumentParser
from getpass import getpass
from base64 import b64encode
import os
import shutil
import stat
import sys
import time
import atexit
log = logging.getLogger(__name__)
def parse_args(args):
parser = ArgumentParser(
description="Initializes an S3QL file system")
parser.add_cachedir()
parser.add_authfile()
parser.add_debug()
parser.add_quiet()
parser.add_backend_options()
parser.add_version()
parser.add_storage_url()
parser.add_fatal_warnings()
parser.add_argument("-L", default='', help="Filesystem label",
dest="label", metavar='<name>',)
parser.add_argument("--max-obj-size", type=int, default=10240, metavar='<size>',
help="Maximum size of storage objects in KiB. Files bigger than this "
"will be spread over multiple objects in the storage backend. "
"Default: %(default)d KiB.")
parser.add_argument("--plain", action="store_true", default=False,
help="Create unencrypted file system.")
parser.add_argument("--force", action="store_true", default=False,
help="Overwrite any existing data.")
options = parser.parse_args(args)
return options
def init_tables(conn):
# Insert root directory
now_ns = time_ns()
conn.execute("INSERT INTO inodes (id,mode,uid,gid,mtime_ns,atime_ns,ctime_ns,refcount) "
"VALUES (?,?,?,?,?,?,?,?)",
(ROOT_INODE, stat.S_IFDIR | stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR
| stat.S_IRGRP | stat.S_IXGRP | stat.S_IROTH | stat.S_IXOTH,
os.getuid(), os.getgid(), now_ns, now_ns, now_ns, 1))
# Insert control inode, the actual values don't matter that much
conn.execute("INSERT INTO inodes (id,mode,uid,gid,mtime_ns,atime_ns,ctime_ns,refcount) "
"VALUES (?,?,?,?,?,?,?,?)",
(CTRL_INODE, stat.S_IFREG | stat.S_IRUSR | stat.S_IWUSR,
0, 0, now_ns, now_ns, now_ns, 42))
# Insert lost+found directory
inode = conn.rowid("INSERT INTO inodes (mode,uid,gid,mtime_ns,atime_ns,ctime_ns,refcount) "
"VALUES (?,?,?,?,?,?,?)",
(stat.S_IFDIR | stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR,
os.getuid(), os.getgid(), now_ns, now_ns, now_ns, 1))
name_id = conn.rowid('INSERT INTO names (name, refcount) VALUES(?,?)',
(b'lost+found', 1))
conn.execute("INSERT INTO contents (name_id, inode, parent_inode) VALUES(?,?,?)",
(name_id, inode, ROOT_INODE))
def main(args=None):
if args is None:
args = sys.argv[1:]
options = parse_args(args)
setup_logging(options)
if options.max_obj_size < 1024:
# This warning should never be converrted to an exception
log.warning('Warning: maximum object sizes less than 1 MiB will seriously degrade '
'performance.', extra={ 'force_log': True })
plain_backend = get_backend(options, raw=True)
atexit.register(plain_backend.close)
log.info("Before using S3QL, make sure to read the user's guide, especially\n"
"the 'Important Rules to Avoid Loosing Data' section.")
if isinstance(plain_backend, s3.Backend) and '.' in plain_backend.bucket_name:
log.warning('***Warning*** S3 Buckets with names containing dots cannot be '
'accessed using SSL!')
log.warning('(cf. https://forums.aws.amazon.com/thread.jspa?threadID=130560)')
if 's3ql_metadata' in plain_backend:
if not options.force:
raise QuietError("Found existing file system! Use --force to overwrite")
log.info('Purging existing file system data..')
plain_backend.clear()
log.info('Please note that the new file system may appear inconsistent\n'
'for a while until the removals have propagated through the backend.')
if not options.plain:
if sys.stdin.isatty():
wrap_pw = getpass("Enter encryption password: ")
if not wrap_pw == getpass("Confirm encryption password: "):
raise QuietError("Passwords don't match.")
else:
wrap_pw = sys.stdin.readline().rstrip()
wrap_pw = wrap_pw.encode('utf-8')
# Generate data encryption passphrase
log.info('Generating random encryption key...')
fh = open('/dev/urandom', "rb", 0) # No buffering
data_pw = fh.read(32)
fh.close()
backend = ComprencBackend(wrap_pw, ('lzma', 2), plain_backend)
backend['s3ql_passphrase'] = data_pw
backend['s3ql_passphrase_bak1'] = data_pw
backend['s3ql_passphrase_bak2'] = data_pw
backend['s3ql_passphrase_bak3'] = data_pw
else:
data_pw = None
backend = ComprencBackend(data_pw, ('lzma', 2), plain_backend)
atexit.unregister(plain_backend.close)
atexit.register(backend.close)
# Setup database
cachepath = get_backend_cachedir(options.storage_url, options.cachedir)
# There can't be a corresponding backend, so we can safely delete
# these files.
if os.path.exists(cachepath + '.db'):
os.unlink(cachepath + '.db')
if os.path.exists(cachepath + '-cache'):
shutil.rmtree(cachepath + '-cache')
log.info('Creating metadata tables...')
db = Connection(cachepath + '.db')
create_tables(db)
init_tables(db)
param = dict()
param['revision'] = CURRENT_FS_REV
param['seq_no'] = 1
param['label'] = options.label
param['max_obj_size'] = options.max_obj_size * 1024
param['needs_fsck'] = False
param['inode_gen'] = 0
param['max_inode'] = db.get_val('SELECT MAX(id) FROM inodes')
param['last_fsck'] = time.time()
param['last-modified'] = time.time()
log.info('Dumping metadata...')
dump_and_upload_metadata(backend, db, param)
backend.store('s3ql_seq_no_%d' % param['seq_no'], b'Empty')
with open(cachepath + '.params', 'wb') as fh:
fh.write(freeze_basic_mapping(param))
if data_pw is not None:
print('Please store the following master key in a safe location. It allows ',
'decryption of the S3QL file system in case the storage objects holding ',
'this information get corrupted:',
'---BEGIN MASTER KEY---',
' '.join(split_by_n(b64encode(data_pw).decode(), 4)),
'---END MASTER KEY---',
sep='\n')
if __name__ == '__main__':
main(sys.argv[1:])
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