/
versionfs.py
268 lines (206 loc) · 8.09 KB
/
versionfs.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
#!/usr/bin/env python
# Edited by Dong Yuan Yang (dyan263)
from __future__ import with_statement
import logging
import os
import sys
import errno
import filecmp
from shutil import copyfile
import re
from fuse import FUSE, FuseOSError, Operations, LoggingMixIn
class VersionFS(LoggingMixIn, Operations):
def __init__(self):
# get current working directory as place for versions tree
self.root = os.path.join(os.getcwd(), '.versiondir')
# check to see if the versions directory already exists
if os.path.exists(self.root):
print 'Version directory already exists.'
else:
print 'Creating version directory.'
os.mkdir(self.root)
# Helpers
# =======
def _full_path(self, partial):
# Responsible for file names saved in .versiondir
# Use os.listdir to find newest version
if partial.startswith("/"):
partial = partial[1:]
try:
a = int(partial[-1])
except:
if partial not in ["autorun.inf", ""] and partial[0] != "." and partial[-2:] != ".t":
partial = partial + ".1"
path = os.path.join(self.root, partial)
return path
def sorty(self, arr):
def con(text): return int(text) if text.isdigit() else text
def alphanum(key): return [con(c) for c in re.split('([0-9]+)', key)]
return sorted(arr, key=alphanum)
# Filesystem methods
# ==================
def access(self, path, mode):
print "access:", path, mode
full_path = self._full_path(path)
if not os.access(full_path, mode):
raise FuseOSError(errno.EACCES)
def chmod(self, path, mode):
print "chmod:", path, mode
full_path = self._full_path(path)
return os.chmod(full_path, mode)
def chown(self, path, uid, gid):
print "chown:", path, uid, gid
full_path = self._full_path(path)
return os.chown(full_path, uid, gid)
def getattr(self, path, fh=None):
print "get:", path
full_path = self._full_path(path)
st = os.lstat(full_path)
return dict((key, getattr(st, key)) for key in ('st_atime', 'st_ctime',
'st_gid', 'st_mode', 'st_mtime', 'st_nlink', 'st_size', 'st_uid'))
def readdir(self, path, fh):
print "readdir:", path
full_path = self._full_path(path)
dirents = ['.', '..']
if os.path.isdir(full_path):
dirents.extend(os.listdir(full_path))
unique = []
for r in dirents:
if r[-2:] != ".t":
try:
a = int(r[-1])
if r[:-2] in unique:
pass
else:
unique.append(r[:-2])
except:
unique.append(r)
for r in unique:
yield r
def readlink(self, path):
print "readlink:", path
pathname = os.readlink(self._full_path(path))
if pathname.startswith("/"):
# Path name is absolute, sanitize it.
return os.path.relpath(pathname, self.root)
else:
return pathname
def mknod(self, path, mode, dev):
print "mknod:", path, mode, dev
return os.mknod(self._full_path(path), mode, dev)
def rmdir(self, path):
print "rmdir:", path
full_path = self._full_path(path)
return os.rmdir(full_path)
def mkdir(self, path, mode):
print "mkdir:", path, mode
return os.mkdir(self._full_path(path), mode)
def statfs(self, path):
print "statfs:", path
full_path = self._full_path(path)
stv = os.statvfs(full_path)
return dict((key, getattr(stv, key)) for key in ('f_bavail', 'f_bfree',
'f_blocks', 'f_bsize', 'f_favail', 'f_ffree', 'f_files', 'f_flag',
'f_frsize', 'f_namemax'))
def unlink(self, path):
print "unlink:", path
return os.unlink(self._full_path(path))
def symlink(self, name, target):
print "symlink:", name, target
return os.symlink(target, self._full_path(name))
def rename(self, old, new):
print "rename:", old, new
return os.rename(self._full_path(old), self._full_path(new))
def link(self, target, name):
print "link:", target, name
return os.link(self._full_path(name), self._full_path(target))
def utimens(self, path, times=None):
print "utimens:", path, times
return os.utime(self._full_path(path), times)
# File methods
# ============
def open(self, path, flags):
print '** open:', path, '**'
path = path[1:]
temppath = path + ".t"
dest = self._full_path(temppath)
full_path = self._full_path(path)
copyfile(full_path, dest)
return os.open(full_path, flags)
def create(self, path, mode, fi=None):
print '** create:', path, '**'
full_path = self._full_path(path)
print full_path
return os.open(full_path, os.O_WRONLY | os.O_CREAT, mode)
def read(self, path, length, offset, fh):
print '** read:', path, '**'
os.lseek(fh, offset, os.SEEK_SET)
return os.read(fh, length)
def write(self, path, buf, offset, fh):
print '** write:', path, '**'
os.lseek(fh, offset, os.SEEK_SET)
return os.write(fh, buf)
def truncate(self, path, length, fh=None):
print '** truncate:', path, '**'
full_path = self._full_path(path)
with open(full_path, 'r+') as f:
f.truncate(length)
def flush(self, path, fh):
print '** flush', path, '**'
return os.fsync(fh)
def release(self, path, fh):
print '** release', path, '**'
partial = path[1:]
full_path = self._full_path("/")
files = os.listdir(full_path)
versions = []
for i in files:
if i[:-2] == partial or i[-2:] == ".t":
# Prev ver exists
versions.append(i)
versions = self.sorty(versions)
versions.reverse()
new_path = full_path + partial
verVals = ["2", "3", "4", "5"]
if len(versions) > 1:
new = new_path + ".1"
old = new_path + ".t"
diff = not filecmp.cmp(new, old, shallow=False)
if diff:
for i in versions:
if i[-2:] != ".t":
spl = i.split(".")
if len(spl) == 3:
if spl[2] in verVals:
newVal = int(spl[2]) + 1
spl = spl[:2]
spl.append(str(newVal))
newer = ".".join(spl)
oldy = full_path + i
newly = full_path + newer
os.rename(oldy, newly)
elif len(spl) == 2:
if spl[1] in verVals:
newVal = int(spl[1]) + 1
spl = spl[:1]
spl.append(str(newVal))
newer = ".".join(spl)
oldy = full_path + i
newly = full_path + newer
os.rename(oldy, newly)
else:
print "You've entered a really messed up file name, please why are you trying to screw me over"
newer = new_path + ".2"
os.rename(old, newer)
else:
old = new_path + ".t"
os.remove(old)
return os.close(fh)
def fsync(self, path, fdatasync, fh):
print '** fsync:', path, '**'
return self.flush(path, fh)
def main(mountpoint):
FUSE(VersionFS(), mountpoint, nothreads=True, foreground=True)
if __name__ == '__main__':
# logging.basicConfig(level=logging.DEBUG)
main(sys.argv[1])