comparison hgext/chgserver.py @ 28262:53dc4aada2d9

chgserver: add utilities to calculate confighash

confighash is the hash of sensitive config items like [extensions], and
sensitive environment variables like HG*, LD_*, etc. The config items
can come from global, user, repo config, and command line flags.

For chgserver, it is designed that once confighash changes, the server is
not qualified to serve its client and should redirect the client to a new
server. The server does not need to exit in this case, since it can still
be valid (have a matched confighash) to serve other chg clients.

28261:2ab59ac06b76

# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'internal'

_log = commandserver.log

# copied from hgext/pager.py:uisetup()
def _setuppagercmd(ui, options, cmd):
    if not ui.formatted():
        return

28262:53dc4aada2d9

# be specifying the version(s) of Mercurial they are tested with, or
# leave the attribute unspecified.
testedwith = 'internal'

_log = commandserver.log

def _hashlist(items):
    """return sha1 hexdigest for a list"""
    return util.sha1(str(items)).hexdigest()

# sensitive config sections affecting confighash
_configsections = ['extensions']

# sensitive environment variables affecting confighash
_envre = re.compile(r'''\A(?:
                    CHGHG
                    |HG.*
                    |LANG(?:UAGE)?
                    |LC_.*
                    |LD_.*
                    |PATH
                    |PYTHON.*
                    |TERM(?:INFO)?
                    |TZ
                    )\Z''', re.X)

def _confighash(ui):
    """return a quick hash for detecting config/env changes

    confighash is the hash of sensitive config items and environment variables.

    for chgserver, it is designed that once confighash changes, the server is
    not qualified to serve its client and should redirect the client to a new
    server. different from mtimehash, confighash change will not mark the
    server outdated and exit since the user can have different configs at the
    same time.
    """
    sectionitems = []
    for section in _configsections:
        sectionitems.append(ui.configitems(section))
    sectionhash = _hashlist(sectionitems)
    envitems = [(k, v) for k, v in os.environ.iteritems() if _envre.match(k)]
    envhash = _hashlist(sorted(envitems))
    return sectionhash[:6] + envhash[:6]

# copied from hgext/pager.py:uisetup()
def _setuppagercmd(ui, options, cmd):
    if not ui.formatted():
        return