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#! /usr/bin/env python3

"""Script to synchronize two source trees.

Invoke with two arguments:

python treesync.py slave master

The assumption is that "master" contains CVS administration while

slave doesn't. All files in the slave tree that have a CVS/Entries

entry in the master tree are synchronized. This means:

If the files differ:

if the slave file is newer:

normalize the slave file

if the files still differ:

copy the slave to the master

else (the master is newer):

copy the master to the slave

normalizing the slave means replacing CRLF with LF when the master

doesn't use CRLF

"""

import os, sys, stat, getopt

# Interactivity options

default_answer = "ask"

create_files = "yes"

create_directories = "no"

write_slave = "ask"

write_master = "ask"

def main():

global always_no, always_yes

global create_directories, write_master, write_slave

opts, args = getopt.getopt(sys.argv[1:], "nym:s:d:f:a:")

for o, a in opts:

if o == '-y':

default_answer = "yes"

if o == '-n':

default_answer = "no"

if o == '-s':

write_slave = a

if o == '-m':

write_master = a

if o == '-d':

create_directories = a

if o == '-f':

create_files = a

if o == '-a':

create_files = create_directories = write_slave = write_master = a

try:

[slave, master] = args

except ValueError:

print("usage: python", sys.argv[0] or "treesync.py", end=' ')

print("[-n] [-y] [-m y|n|a] [-s y|n|a] [-d y|n|a] [-f n|y|a]", end=' ')

print("slavedir masterdir")

return

process(slave, master)

def process(slave, master):

cvsdir = os.path.join(master, "CVS")

if not os.path.isdir(cvsdir):

print("skipping master subdirectory", master)

print("-- not under CVS")

return

print("-"*40)

print("slave ", slave)

print("master", master)

if not os.path.isdir(slave):

if not okay("create slave directory %s?" % slave,

answer=create_directories):

print("skipping master subdirectory", master)

print("-- no corresponding slave", slave)

return

print("creating slave directory", slave)

try:

os.mkdir(slave)

except OSError as msg:

print("can't make slave directory", slave, ":", msg)

return

else:

print("made slave directory", slave)

cvsdir = None

subdirs = []

names = os.listdir(master)

for name in names:

mastername = os.path.join(master, name)

slavename = os.path.join(slave, name)

if name == "CVS":

cvsdir = mastername

else:

if os.path.isdir(mastername) and not os.path.islink(mastername):

subdirs.append((slavename, mastername))

if cvsdir:

entries = os.path.join(cvsdir, "Entries")

for e in open(entries).readlines():

words = e.split('/')

if words[0] == '' and words[1:]:

name = words[1]

s = os.path.join(slave, name)

m = os.path.join(master, name)

compare(s, m)

for (s, m) in subdirs:

process(s, m)

def compare(slave, master):

try:

sf = open(slave, 'r')

except IOError:

sf = None

try:

mf = open(master, 'rb')

except IOError:

mf = None

if not sf:

if not mf:

print("Neither master nor slave exists", master)

return

print("Creating missing slave", slave)

copy(master, slave, answer=create_files)

return

if not mf:

print("Not updating missing master", master)

return

if sf and mf:

if identical(sf, mf):

return

sft = mtime(sf)

mft = mtime(mf)

if mft > sft:

# Master is newer -- copy master to slave

sf.close()

mf.close()

print("Master ", master)

print("is newer than slave", slave)

copy(master, slave, answer=write_slave)

return

# Slave is newer -- copy slave to master

print("Slave is", sft-mft, "seconds newer than master")

# But first check what to do about CRLF

mf.seek(0)

fun = funnychars(mf)

mf.close()

sf.close()

if fun:

print("***UPDATING MASTER (BINARY COPY)***")

copy(slave, master, "rb", answer=write_master)

else:

print("***UPDATING MASTER***")

copy(slave, master, "r", answer=write_master)

BUFSIZE = 16*1024

def identical(sf, mf):

while 1:

sd = sf.read(BUFSIZE)

md = mf.read(BUFSIZE)

if sd != md: return 0

if not sd: break

return 1

def mtime(f):

st = os.fstat(f.fileno())

return st[stat.ST_MTIME]

def funnychars(f):

while 1:

buf = f.read(BUFSIZE)

if not buf: break

if '\r' in buf or '\0' in buf: return 1

return 0

def copy(src, dst, rmode="rb", wmode="wb", answer='ask'):

print("copying", src)

print(" to", dst)

if not okay("okay to copy? ", answer):

return

f = open(src, rmode)

g = open(dst, wmode)

while 1:

buf = f.read(BUFSIZE)

if not buf: break

g.write(buf)

f.close()

g.close()

def raw_input(prompt):

sys.stdout.write(prompt)

sys.stdout.flush()

return sys.stdin.readline()

def okay(prompt, answer='ask'):

answer = answer.strip().lower()

if not answer or answer[0] not in 'ny':

answer = input(prompt)

answer = answer.strip().lower()

if not answer:

answer = default_answer

if answer[:1] == 'y':

return 1

if answer[:1] == 'n':

return 0

print("Yes or No please -- try again:")

return okay(prompt)

if __name__ == '__main__':

main()

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