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git-p4: encode/decode communication with p4 for python3

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The marshalled dict in the response given on STDOUT by p4 uses `str` for
keys and string values. When run using python3, these values are
deserialized as `bytes`, leading to a whole host of problems as the rest
of the code assumes `str` is used throughout.

This patch changes the deserialization behaviour such that, as much as
possible, text output from p4 is decoded to native unicode strings.
Exceptions are made for the field `data` as it is usually arbitrary
binary data. `depotFile[0-9]*`, `path`, and `clientFile` are also exempt
as they contain path strings not encoded with UTF-8, and must survive
round-trip back to p4.

Conversely, text data being piped to p4 must always be encoded when
running under python3.

encode_text_stream() and decode_text_stream() were added to make these
transformations more convenient.

Signed-off-by: Yang Zhao <yang.zhao@skyboxlabs.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Yang Zhao 2019-12-13 15:52:38 -08:00 committed by Junio C Hamano
parent 1f8b46d0a4
commit 6cec21a82f
1 changed files with 46 additions and 13 deletions
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59
git-p4.py
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@ -135,6 +135,21 @@ def die(msg):
sys.stderr.write(msg + "\n")
sys.exit(1)
# We need different encoding/decoding strategies for text data being passed
# around in pipes depending on python version
if bytes is not str:
# For python3, always encode and decode as appropriate
def decode_text_stream(s):
return s.decode() if isinstance(s, bytes) else s
def encode_text_stream(s):
return s.encode() if isinstance(s, str) else s
else:
# For python2.7, pass read strings as-is, but also allow writing unicode
def decode_text_stream(s):
return s
def encode_text_stream(s):
return s.encode('utf_8') if isinstance(s, unicode) else s
def write_pipe(c, stdin):
if verbose:
sys.stderr.write('Writing pipe: %s\n' % str(c))
@ -151,6 +166,8 @@ def write_pipe(c, stdin):
def p4_write_pipe(c, stdin):
real_cmd = p4_build_cmd(c)
if bytes is not str and isinstance(stdin, str):
stdin = encode_text_stream(stdin)
return write_pipe(real_cmd, stdin)
def read_pipe_full(c):
@ -164,7 +181,7 @@ def read_pipe_full(c):
expand = not isinstance(c, list)
p = subprocess.Popen(c, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=expand)
(out, err) = p.communicate()
return (p.returncode, out, err)
return (p.returncode, out, decode_text_stream(err))
def read_pipe(c, ignore_error=False):
""" Read output from command. Returns the output text on
@ -187,11 +204,11 @@ def read_pipe_text(c):
if retcode != 0:
return None
else:
return out.rstrip()
return decode_text_stream(out).rstrip()
def p4_read_pipe(c, ignore_error=False):
def p4_read_pipe(c, ignore_error=False, raw=False):
real_cmd = p4_build_cmd(c)
return read_pipe(real_cmd, ignore_error)
return read_pipe(real_cmd, ignore_error, raw=raw)
def read_pipe_lines(c):
if verbose:
@ -200,7 +217,7 @@ def read_pipe_lines(c):
expand = not isinstance(c, list)
p = subprocess.Popen(c, stdout=subprocess.PIPE, shell=expand)
pipe = p.stdout
val = pipe.readlines()
val = [decode_text_stream(line) for line in pipe.readlines()]
if pipe.close() or p.wait():
die('Command failed: %s' % str(c))
@ -231,6 +248,7 @@ def p4_has_move_command():
cmd = p4_build_cmd(["move", "-k", "@from", "@to"])
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(out, err) = p.communicate()
err = decode_text_stream(err)
# return code will be 1 in either case
if err.find("Invalid option") >= 0:
return False
@ -611,6 +629,20 @@ def p4CmdList(cmd, stdin=None, stdin_mode='w+b', cb=None, skip_info=False,
try:
while True:
entry = marshal.load(p4.stdout)
if bytes is not str:
# Decode unmarshalled dict to use str keys and values, except for:
# - `data` which may contain arbitrary binary data
# - `depotFile[0-9]*`, `path`, or `clientFile` which may contain non-UTF8 encoded text
decoded_entry = {}
for key, value in entry.items():
key = key.decode()
if isinstance(value, bytes) and not (key in ('data', 'path', 'clientFile') or key.startswith('depotFile')):
value = value.decode()
decoded_entry[key] = value
# Parse out data if it's an error response
if decoded_entry.get('code') == 'error' and 'data' in decoded_entry:
decoded_entry['data'] = decoded_entry['data'].decode()
entry = decoded_entry
if skip_info:
if 'code' in entry and entry['code'] == 'info':
continue
@ -828,6 +860,7 @@ def branch_exists(branch):
cmd = [ "git", "rev-parse", "--symbolic", "--verify", branch ]
p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, _ = p.communicate()
out = decode_text_stream(out)
if p.returncode:
return False
# expect exactly one line of output: the branch name
@ -1971,7 +2004,7 @@ class P4Submit(Command, P4UserMap):
tmpFile = os.fdopen(handle, "w+b")
if self.isWindows:
submitTemplate = submitTemplate.replace("\n", "\r\n")
tmpFile.write(submitTemplate)
tmpFile.write(encode_text_stream(submitTemplate))
tmpFile.close()
if self.prepare_p4_only:
@ -2018,7 +2051,7 @@ class P4Submit(Command, P4UserMap):
if self.edit_template(fileName):
# read the edited message and submit
tmpFile = open(fileName, "rb")
message = tmpFile.read()
message = decode_text_stream(tmpFile.read())
tmpFile.close()
if self.isWindows:
message = message.replace("\r\n", "\n")
@ -2707,7 +2740,7 @@ class P4Sync(Command, P4UserMap):
return branches
def writeToGitStream(self, gitMode, relPath, contents):
self.gitStream.write('M %s inline %s\n' % (gitMode, relPath))
self.gitStream.write(encode_text_stream(u'M {} inline {}\n'.format(gitMode, relPath)))
self.gitStream.write('data %d\n' % sum(len(d) for d in contents))
for d in contents:
self.gitStream.write(d)
@ -2748,7 +2781,7 @@ class P4Sync(Command, P4UserMap):
git_mode = "120000"
# p4 print on a symlink sometimes contains "target\n";
# if it does, remove the newline
data = ''.join(contents)
data = ''.join(decode_text_stream(c) for c in contents)
if not data:
# Some version of p4 allowed creating a symlink that pointed
# to nothing. This causes p4 errors when checking out such
@ -2802,7 +2835,7 @@ class P4Sync(Command, P4UserMap):
pattern = p4_keywords_regexp_for_type(type_base, type_mods)
if pattern:
regexp = re.compile(pattern, re.VERBOSE)
text = ''.join(contents)
text = ''.join(decode_text_stream(c) for c in contents)
text = regexp.sub(r'$\1$', text)
contents = [ text ]
@ -2817,7 +2850,7 @@ class P4Sync(Command, P4UserMap):
if verbose:
sys.stdout.write("delete %s\n" % relPath)
sys.stdout.flush()
self.gitStream.write("D %s\n" % relPath)
self.gitStream.write(encode_text_stream(u'D {}\n'.format(relPath)))
if self.largeFileSystem and self.largeFileSystem.isLargeFile(relPath):
self.largeFileSystem.removeLargeFile(relPath)
@ -2917,9 +2950,9 @@ class P4Sync(Command, P4UserMap):
if 'shelved_cl' in f:
# Handle shelved CLs using the "p4 print file@=N" syntax to print
# the contents
fileArg = '%s@=%d' % (f['path'], f['shelved_cl'])
fileArg = f['path'] + encode_text_stream('@={}'.format(f['shelved_cl']))
else:
fileArg = '%s#%s' % (f['path'], f['rev'])
fileArg = f['path'] + encode_text_stream('#{}'.format(f['rev']))
fileArgs.append(fileArg)