view mercurial/pure/diffhelpers.py @ 23042:2cd3fa4412dc

ssl: only use the dummy cert hack if using an Apple Python (issue4410)

The hack for using certificate store in addition to the provided CAs resides in
Apple's OpenSSL. Apple's own Pythons will use it, but other custom built
Pythons might use a custom built OpenSSL without that hack and will fail when
exposed to the dummy cacert introduced in d7f7f1860f00.

There do not seem to be a simple way to check from Python if we are using a
patched OpenSSL or if it is an Apple OpenSSL.

Instead, check if the Python executable resides in /usr/bin/python* or in
/System/Library/Frameworks/Python.framework/ and assume that all Pythons found
there will be native Pythons using the patched OpenSSL.

Custom built Pythons will not get the benefit of using the CAs from the
certificate store.

# diffhelpers.py - pure Python implementation of diffhelpers.c
#
# Copyright 2009 Matt Mackall <[e-mail]> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

def addlines(fp, hunk, lena, lenb, a, b):
    while True:
        todoa = lena - len(a)
        todob = lenb - len(b)
        num = max(todoa, todob)
        if num == 0:
            break
        for i in xrange(num):
            s = fp.readline()
            c = s[0]
            if s == "\\ No newline at end of file\n":
                fix_newline(hunk, a, b)
                continue
            if c == "\n":
                # Some patches may be missing the control char
                # on empty lines. Supply a leading space.
                s = " \n"
            hunk.append(s)
            if c == "+":
                b.append(s[1:])
            elif c == "-":
                a.append(s)
            else:
                b.append(s[1:])
                a.append(s)
    return 0

def fix_newline(hunk, a, b):
    l = hunk[-1]
    # tolerate CRLF in last line
    if l.endswith('\r\n'):
        hline = l[:-2]
    else:
        hline = l[:-1]
    c = hline[0]

    if c in " +":
        b[-1] = hline[1:]
    if c in " -":
        a[-1] = hline
    hunk[-1] = hline
    return 0


def testhunk(a, b, bstart):
    alen = len(a)
    blen = len(b)
    if alen > blen - bstart:
        return -1
    for i in xrange(alen):
        if a[i][1:] != b[i + bstart]:
            return -1
    return 0