annotate tests/test-context.py @ 37048:fc5e261915b9

wireproto: require POST for all HTTPv2 requests

Wire protocol version 1 transfers argument data via request
headers by default. This has historically caused problems because
servers institute limits on the length of individual HTTP headers
as well as the total size of all request headers. Mercurial servers
can advertise the maximum length of an individual header. But
there's no guarantee any intermediate HTTP agents will accept
headers up to that length.

In the existing wire protocol, server operators typically also
key off the HTTP request method to implement authentication.
For example, GET requests translate to read-only requests and
can be allowed. But read-write commands must use POST and require
authentication. This has typically worked because the only wire
protocol commands that use POST modify the repo (e.g. the
"unbundle" command).

There is an experimental feature to enable clients to transmit
argument data via POST request bodies. This is technically a
better and more robust solution. But we can't enable it by default
because of servers assuming POST means write access.

In version 2 of the wire protocol, the permissions of a request
are encoded in the URL. And with it being a new protocol in a new
URL space, we're not constrained by backwards compatibility
requirements.

This commit adopts the technically superior mechanism of using
HTTP request bodies to send argument data by requiring POST for
all commands. Strictly speaking, it may be possible to send
request bodies on GET requests. But my experience is that not all
HTTP stacks support this. POST pretty much always works. Using POST
for read-only operations does sacrifice some RESTful design
purity. But this API cares about practicality, not about being
in Roy T. Fielding's REST ivory tower.

There's a chance we may relax this restriction in the future. But
for now, I want to see how far we can get with a POST only API.

Differential Revision: https://phab.mercurial-scm.org/D2837

from __future__ import absolute_import, print_function
import os
import stat
from mercurial.node import hex
from mercurial import (
    context,
    encoding,
    hg,
    scmutil,
    ui as uimod,
)

u = uimod.ui.load()

repo = hg.repository(u, 'test1', create=1)
os.chdir('test1')

# create 'foo' with fixed time stamp
f = open('foo', 'wb')
f.write(b'foo\n')
f.close()
os.utime('foo', (1000, 1000))

# add+commit 'foo'
repo[None].add(['foo'])
repo.commit(text='commit1', date="0 0")

d = repo[None]['foo'].date()
if os.name == 'nt':
    d = d[:2]
print("workingfilectx.date = (%d, %d)" % d)

# test memctx with non-ASCII commit message

def filectxfn(repo, memctx, path):
    return context.memfilectx(repo, memctx, "foo", "")

ctx = context.memctx(repo, ['tip', None],
                     encoding.tolocal("Gr\xc3\xbcezi!"),
                     ["foo"], filectxfn)
ctx.commit()
for enc in "ASCII", "Latin-1", "UTF-8":
    encoding.encoding = enc
    print("%-8s: %s" % (enc, repo["tip"].description()))

# test performing a status

def getfilectx(repo, memctx, f):
    fctx = memctx.parents()[0][f]
    data, flags = fctx.data(), fctx.flags()
    if f == 'foo':
        data += 'bar\n'
    return context.memfilectx(repo, memctx, f, data, 'l' in flags, 'x' in flags)

ctxa = repo.changectx(0)
ctxb = context.memctx(repo, [ctxa.node(), None], "test diff", ["foo"],
                      getfilectx, ctxa.user(), ctxa.date())

print(ctxb.status(ctxa))

# test performing a diff on a memctx

for d in ctxb.diff(ctxa, git=True):
    print(d, end='')

# test safeness and correctness of "ctx.status()"
print('= checking context.status():')

# ancestor "wcctx ~ 2"
actx2 = repo['.']

repo.wwrite('bar-m', 'bar-m\n', '')
repo.wwrite('bar-r', 'bar-r\n', '')
repo[None].add(['bar-m', 'bar-r'])
repo.commit(text='add bar-m, bar-r', date="0 0")

# ancestor "wcctx ~ 1"
actx1 = repo['.']

repo.wwrite('bar-m', 'bar-m bar-m\n', '')
repo.wwrite('bar-a', 'bar-a\n', '')
repo[None].add(['bar-a'])
repo[None].forget(['bar-r'])

# status at this point:
#   M bar-m
#   A bar-a
#   R bar-r
#   C foo

from mercurial import scmutil

print('== checking workingctx.status:')

wctx = repo[None]
print('wctx._status=%s' % (str(wctx._status)))

print('=== with "pattern match":')
print(actx1.status(other=wctx,
                   match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
print('wctx._status=%s' % (str(wctx._status)))
print(actx2.status(other=wctx,
                   match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
print('wctx._status=%s' % (str(wctx._status)))

print('=== with "always match" and "listclean=True":')
print(actx1.status(other=wctx, listclean=True))
print('wctx._status=%s' % (str(wctx._status)))
print(actx2.status(other=wctx, listclean=True))
print('wctx._status=%s' % (str(wctx._status)))

print("== checking workingcommitctx.status:")

wcctx = context.workingcommitctx(repo,
                                 scmutil.status(['bar-m'],
                                                ['bar-a'],
                                                [],
                                                [], [], [], []),
                                 text='', date='0 0')
print('wcctx._status=%s' % (str(wcctx._status)))

print('=== with "always match":')
print(actx1.status(other=wcctx))
print('wcctx._status=%s' % (str(wcctx._status)))
print(actx2.status(other=wcctx))
print('wcctx._status=%s' % (str(wcctx._status)))

print('=== with "always match" and "listclean=True":')
print(actx1.status(other=wcctx, listclean=True))
print('wcctx._status=%s' % (str(wcctx._status)))
print(actx2.status(other=wcctx, listclean=True))
print('wcctx._status=%s' % (str(wcctx._status)))

print('=== with "pattern match":')
print(actx1.status(other=wcctx,
                   match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
print('wcctx._status=%s' % (str(wcctx._status)))
print(actx2.status(other=wcctx,
                   match=scmutil.matchfiles(repo, ['bar-m', 'foo'])))
print('wcctx._status=%s' % (str(wcctx._status)))

print('=== with "pattern match" and "listclean=True":')
print(actx1.status(other=wcctx,
                   match=scmutil.matchfiles(repo, ['bar-r', 'foo']),
                   listclean=True))
print('wcctx._status=%s' % (str(wcctx._status)))
print(actx2.status(other=wcctx,
                   match=scmutil.matchfiles(repo, ['bar-r', 'foo']),
                   listclean=True))
print('wcctx._status=%s' % (str(wcctx._status)))

os.chdir('..')

# test manifestlog being changed
print('== commit with manifestlog invalidated')

repo = hg.repository(u, 'test2', create=1)
os.chdir('test2')

# make some commits
for i in [b'1', b'2', b'3']:
    with open(i, 'wb') as f:
        f.write(i)
    status = scmutil.status([], [i], [], [], [], [], [])
    ctx = context.workingcommitctx(repo, status, text=i, user=b'[e-mail]',
                                   date=(0, 0))
    ctx.p1().manifest() # side effect: cache manifestctx
    n = repo.commitctx(ctx)
    print('commit %s: %s' % (i, hex(n)))

    # touch 00manifest.i mtime so storecache could expire.
    # repo.__dict__['manifestlog'] is deleted by transaction releasefn.
    st = repo.svfs.stat('00manifest.i')
    repo.svfs.utime('00manifest.i',
                    (st[stat.ST_MTIME] + 1, st[stat.ST_MTIME] + 1))

    # read the file just committed
    try:
        if repo[n][i].data() != i:
            print('data mismatch')
    except Exception as ex:
        print('cannot read data: %r' % ex)

with repo.wlock(), repo.lock(), repo.transaction('test'):
    with open(b'4', 'wb') as f:
        f.write(b'4')
    repo.dirstate.normal('4')
    repo.commit('4')
    revsbefore = len(repo.changelog)
    repo.invalidate(clearfilecache=True)
    revsafter = len(repo.changelog)
    if revsbefore != revsafter:
        print('changeset lost by repo.invalidate()')