contrib/debugcmdserver.py

archival: add "extended-timestamp" extra block for zip archives (issue3600)

Before this patch, zip archives created by "hg archive" are extracted
with unexpected timestamp, if TZ is not configured as GMT.

This patch adds "extended-timestamp" extra block to zip archives, and
unzip will extract such archives with timestamp specified in added
extra block, even though TZ is not configured as GMT.

Please see documents below for detail about specification of zip file
format and "extended-timestamp" extra block:

  http://www.pkware.com/documents/casestudies/APPNOTE.TXT
  http://www.opensource.apple.com/source/zip/zip-6/unzip/unzip/proginfo/extra.fld

Original implementation of this patch was suggested by "Jun Omae
<[e-mail]>".

#!/usr/bin/env python
#
# Dumps output generated by Mercurial's command server in a formatted style to a
# given file or stderr if '-' is specified. Output is also written in its raw
# format to stdout.
#
# $ ./hg serve --cmds pipe | ./contrib/debugcmdserver.py -
# o, 52   -> 'capabilities: getencoding runcommand\nencoding: UTF-8'

import sys, struct

if len(sys.argv) != 2:
    print 'usage: debugcmdserver.py FILE'
    sys.exit(1)

outputfmt = '>cI'
outputfmtsize = struct.calcsize(outputfmt)

if sys.argv[1] == '-':
    log = sys.stderr
else:
    log = open(sys.argv[1], 'a')

def read(size):
    data = sys.stdin.read(size)
    if not data:
        raise EOFError
    sys.stdout.write(data)
    sys.stdout.flush()
    return data

try:
    while True:
        header = read(outputfmtsize)
        channel, length = struct.unpack(outputfmt, header)
        log.write('%s, %-4d' % (channel, length))
        if channel in 'IL':
            log.write(' -> waiting for input\n')
        else:
            data = read(length)
            log.write(' -> %r\n' % data)
        log.flush()
except EOFError:
    pass
finally:
    if log != sys.stderr:
        log.close()