mirror of https://github.com/borgbackup/borg.git
Initial import.
This commit is contained in:
Jonas Borgström
commit
7d6aa3763d
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#!/usr/bin/env python
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import fcntl
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import tempfile
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import logging
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import os
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import posixpath
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import shutil
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import unittest
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CHUNKSIZE = 256 * 1024
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log = logging.getLogger('')
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class Repository(object):
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"""
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"""
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IDLE = 'Idle'
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OPEN = 'Open'
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ACTIVE = 'Active'
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VERSION = 'DEDUPSTORE REPOSITORY VERSION 1'
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def __init__(self, path):
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self.tid = -1
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self.state = Repository.IDLE
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if not os.path.exists(path):
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self.create(path)
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self.open(path)
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def create(self, path):
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log.info('Initializing Repository at "%s"' % path)
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os.mkdir(path)
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open(os.path.join(path, 'VERSION'), 'wb').write(self.VERSION)
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open(os.path.join(path, 'tid'), 'wb').write('0')
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os.mkdir(os.path.join(path, 'data'))
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def open(self, path):
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self.path = path
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if not os.path.isdir(path):
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raise Exception('%s Does not look like a repository')
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version_path = os.path.join(path, 'version')
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if not os.path.exists(version_path) or open(version_path, 'rb').read() != self.VERSION:
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raise Exception('%s Does not look like a repository2')
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self.lock_fd = open(os.path.join(path, 'lock'), 'w')
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fcntl.flock(self.lock_fd, fcntl.LOCK_EX)
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self.tid = int(open(os.path.join(path, 'tid'), 'r').read())
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self.recover()
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def recover(self):
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if os.path.exists(os.path.join(self.path, 'txn-active')):
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self.rollback()
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if os.path.exists(os.path.join(self.path, 'txn-commit')):
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self.commit()
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self.state = Repository.OPEN
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def close(self):
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self.recover()
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self.lock_fd.close()
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self.state = Repository.IDLE
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def commit(self):
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"""
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"""
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if self.state == Repository.OPEN:
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return
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assert self.state == Repository.ACTIVE
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remove_fd = open(os.path.join(self.path, 'txn-active', 'remove'), 'wb')
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remove_fd.write('\n'.join(self.txn_removed))
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remove_fd.close()
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os.rename(os.path.join(self.path, 'txn-active'),
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os.path.join(self.path, 'txn-commit'))
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self.commit_txn()
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def commit_txn(self):
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assert os.path.isdir(os.path.join(self.path, 'txn-commit'))
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raise NotImplementedError
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def rollback(self):
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"""
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"""
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txn_path = os.path.join(self.path, 'txn-active')
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if os.path.exists(txn_path):
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shutil.rmtree(txn_path)
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self.state = Repository.OPEN
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def prepare_txn(self):
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if self.state == Repository.ACTIVE:
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return os.path.join(self.path, 'txn-active')
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elif self.state == Repository.OPEN:
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os.mkdir(os.path.join(self.path, 'txn-active'))
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os.mkdir(os.path.join(self.path, 'txn-active', 'add'))
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open(os.path.join(self.path, 'txn-active', 'tid'), 'wb').write(str(self.tid + 1))
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self.txn_removed = []
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self.state = Repository.ACTIVE
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def get_file(self, path):
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"""
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"""
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if os.path.exists(os.path.join(self.path, 'txn-active', 'add', path)):
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return open(os.path.join(self.path, 'txn-active', 'add', path), 'rb').read()
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elif os.path.exists(os.path.join(self.path, 'data', path)):
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return open(os.path.join(self.path, 'data', path), 'rb').read()
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else:
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raise Exception('FileNotFound: %s' % path)
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def put_file(self, path, data):
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"""
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"""
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self.prepare_txn()
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if path in self.txn_removed:
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self.txn_removed.remove(path)
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if os.path.exists(os.path.join(self.path, 'txn-active', 'add', path)):
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raise Exception('FileAlreadyExists: %s' % path)
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fd = open(os.path.join(self.path, 'txn-active', 'add', path), 'wb')
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try:
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fd.write(data)
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finally:
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fd.close()
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def delete(self, path):
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"""
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"""
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self.prepare_txn()
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if os.path.exists(os.path.join(self.path, 'txn-active', 'add', path)):
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os.unlink(os.path.join(self.path, 'txn-active', 'add', path))
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elif os.path.exists(os.path.join(self.path, 'data', path)):
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self.txn_removed.append(path)
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else:
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raise Exception('FileNotFound: %s' % path)
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def listdir(self, path):
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"""
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"""
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entries = set(os.listdir(os.path.join(self.path, 'data', path)))
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if self.state == Repository.ACTIVE:
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txn_entries = set(os.listdir(os.path.join(self.path, 'txn-active', 'add', path)))
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entries = entries.union(txn_entries)
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for e in entries:
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if posixpath.join(path, e) in self.txn_removed:
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entries.remove(e)
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return list(entries)
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def mkdir(self, path):
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"""
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"""
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def rmdir(self, path):
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"""
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"""
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class RepositoryTestCase(unittest.TestCase):
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def setUp(self):
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self.tmppath = tempfile.mkdtemp()
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self.repo = Repository(os.path.join(self.tmppath, 'repo'))
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def tearDown(self):
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shutil.rmtree(self.tmppath)
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def test1(self):
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self.assertEqual(self.repo.tid, 0)
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self.assertEqual(self.repo.state, Repository.OPEN)
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self.assertEqual(self.repo.listdir(''), [])
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self.repo.put_file('foo', 'SOMEDATA')
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self.assertRaises(Exception, lambda: self.repo.put_file('foo', 'SOMETHINGELSE'))
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self.assertEqual(self.repo.get_file('foo'), 'SOMEDATA')
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self.assertEqual(self.repo.listdir(''), ['foo'])
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self.repo.rollback()
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self.assertEqual(self.repo.listdir(''), [])
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def test2(self):
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self.repo.put_file('foo', 'SOMEDATA')
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self.repo.put_file('bar', 'SOMEDATAbar')
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self.assertEqual(self.repo.listdir(''), ['foo', 'bar'])
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self.assertEqual(self.repo.get_file('foo'), 'SOMEDATA')
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self.repo.delete('foo')
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self.assertRaises(Exception, lambda: self.repo.get_file('foo'))
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self.assertEqual(self.repo.listdir(''), ['bar'])
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self.assertEqual(self.repo.state, Repository.ACTIVE)
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self.repo.commit()
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if __name__ == '__main__':
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unittest.main()
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@ -0,0 +1,51 @@
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"""
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Dedupstore
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==========
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cache = Cache(path,)
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for file in files:
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chunks = chunkify(file)
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for chunk in chunkify(file):
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if chunk.sha in cache:
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cache.chunk_inc_ref(chunk)
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else:
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fs.add_chunk(chunk)
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entry = Entry
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archive.add(entry)
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Repository layout
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-----------------
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REPO/README
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REPO/VERSION
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REPO/tid = x
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REPO/data/
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REPO/txn-active/tid
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REPO/txn-active/add/<PATH>/
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REPO/txn-active/delete/<PATH>/
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REPO/txn-active/tid
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REPO/txn-commit/add/<PATH>/
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REPO/txn-commit/delete/<PATH>/
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REPO/archives/<ARCHIVENAME>
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REPO/blocks/XX/YY/XYZ
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txn_completed/add/<PATH>/
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txn_completed/delete/<PATH>/
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API
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---
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"""
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class Cache(object):
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def chunk_inc_ref(self, chunk):
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self.chunk_refcount.setdefault(chunk.sha, 0)
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self.chunk_refcount[chunk.sha] += 1
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def chunk_dec_ref(self, chunk):
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assert self.chunk_refcount.get(chunk.sha, 0) > 0
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self.chunk_refcount[chunk.sha] -= 1
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if self.chunk_refcount[chunk.sha] == 0:
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self.fs.delete_chunk(self.sha)
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txn = txn_begin()
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