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"""Utilities to read and write CVS admin files (esp. CVS/Entries)"""
import string
import os
import time
class Entry:
"""Class representing one (parsed) line from CVS/Entries"""
def __init__(self, line):
words = string.splitfields(line, '/')
self.file = words[1]
self.rev = words[2]
dates = words[3] # ctime, mtime
if len(dates) != 49 or dates[:7] == 'Initial':
self.ctime = None
self.mtime = None
self.new = dates[:7] == 'Initial'
else:
self.ctime = unctime(dates[:24])
self.mtime = unctime(dates[25:])
self.new = 0
self.extra = words[4]
self.sum = None
def unparse(self):
if self.new:
dates = "Initial %s" % self.file
else:
dates = gmctime(self.ctime) + ' ' + gmctime(self.mtime)
return "/%s/%s/%s/%s/\n" % (
self.file,
self.rev,
dates,
self.extra)
def setsum(self, sum):
self.sum = sum
def getsum(self):
return self.sum
def sethexsum(self, hexsum):
self.setsum(unhexify(hexsum))
def gethexsum(self):
if self.sum:
return hexify(self.sum)
else:
return None
def dump(self):
keys = self.__dict__.keys()
keys.sort()
for key in keys:
print "%-15s: %s" % (key, `self.__dict__[key]`)
print '-'*45
class CVS:
"""Class representing the contents of CVS/Entries (and CVS/Sums)"""
def __init__(self):
self.readentries()
def readentries(self):
self.entries = {}
f = self.cvsopen("Entries")
while 1:
line = f.readline()
if not line: break
e = Entry(line)
self.entries[e.file] = e
f.close()
def readsums(self):
try:
f = self.cvsopen("Sums")
except IOError:
return
while 1:
line = f.readline()
if not line: break
words = string.split(line)
[file, rev, hexsum] = words
if not self.entries.has_key(file):
continue
e = self.entries[file]
if e.rev == rev:
e.sethexsum(hexsum)
f.close()
def writeentries(self):
f = self.cvsopen("Entries", 'w')
for file in self.keys():
f.write(self.entries[file].unparse())
f.close()
def writesums(self):
if self.cvsexists("Sums"):
f = self.cvsopen("Sums", 'w')
else:
f = None
for file in self.keys():
e = self.entries[file]
hexsum = e.gethexsum()
if hexsum:
if not f:
f = self.cvsopen("Sums", 'w')
f.write("%s %s %s\n" % (file, e.rev, hexsum))
if f:
f.close()
def keys(self):
keys = self.entries.keys()
keys.sort()
return keys
def cvsexists(self, file):
file = os.path.join("CVS", file)
return os.path.exists(file)
def cvsopen(self, file, mode = 'r'):
file = os.path.join("CVS", file)
if 'r' not in mode:
self.backup(file)
return open(file, mode)
def backup(self, file):
if os.path.isfile(file):
bfile = file + '~'
os.rename(file, bfile)
hexify_format = '%02x' * 16
def hexify(sum):
"Return a hex representation of a 16-byte string (e.g. an MD5 digest)"
return hexify_format % tuple(map(ord, sum))
def unhexify(hexsum):
"Return the original from a hexified string"
sum = ''
for i in range(0, len(hexsum), 2):
sum = sum + chr(string.atoi(hexsum[i:i+2], 16))
return sum
unctime_monthmap = {}
def unctime(date):
if not unctime_monthmap:
months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
i = 0
for m in months:
i = i+1
unctime_monthmap[m] = i
words = string.split(date) # Day Mon DD HH:MM:SS YEAR
year = string.atoi(words[4])
month = unctime_monthmap[words[1]]
day = string.atoi(words[2])
[hh, mm, ss] = map(string.atoi, string.splitfields(words[3], ':'))
ss = ss - time.timezone
return time.mktime((year, month, day, hh, mm, ss, 0, 0, 0))
def gmctime(t):
return time.asctime(time.gmtime(t))
def test_unctime():
now = int(time.time())
t = time.gmtime(now)
at = time.asctime(t)
print 'GMT', now, at
print 'timezone', time.timezone
print 'local', time.ctime(now)
u = unctime(at)
print 'unctime()', u
gu = time.gmtime(u)
print '->', gu
print time.asctime(gu)
def test():
x = CVS()
keys = x.entries.keys()
keys.sort()
for file in keys:
e = x.entries[file]
print file, e.rev, gmctime(e.ctime), gmctime(e.mtime), e.extra,
print e.gethexsum()
if __name__ == "__main__":
test()
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