Source tree synchronization tool (for Windowes, mostly)

Tools/scripts/treesync.py

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+#! /usr/bin/env python
+
+"""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, string, 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",
+	print "[-n] [-y] [-m y|n|a] [-s y|n|a] [-d y|n|a] [-f n|y|a]",
+	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 os.error, 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 = string.split(e, '/')
+	    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, 'rb')
+    except IOError:
+	sf = None
+    try:
+	mf = open(master, 'rb')
+    except IOError:
+	mf = None
+    if not sf:
+	if not mf:
+	    print "Not updating missing master", master
+	    return
+	print "Creating missing slave", slave
+	copy(master, slave, answer=create_files)
+	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
+    # 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", write_master)
+    else:
+	print "***UPDATING MASTER***"
+	copy(slave, master, "r", 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 okay(prompt, answer='ask'):
+    answer = string.lower(string.strip(answer))
+    if not answer or answer[0] not in 'ny':
+	answer = raw_input(prompt)
+	answer = string.lower(string.strip(answer))
+	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)
+
+main()