windows: degrade to py2 behavior when reading a non-symlink as a symlink
While waiting for the push to hg-committed in WSL to complete, I ran a
`phabimport` from Windows and got this traceback:
$ hg phabimport 11313
** Unknown exception encountered with possibly-broken third-party extension "mercurial_keyring" (version N/A)
** which supports versions unknown of Mercurial.
** Please disable "mercurial_keyring" and try your action again.
** If that fixes the bug please report it to https://foss.heptapod.net/mercurial/mercurial_keyring/issues
** Python 3.9.5 (default, May 6 2021, 17:29:31) [MSC v.1928 64 bit (AMD64)]
** Mercurial Distributed SCM (version 5.9rc1+hg32.
0e2f5733563d)
** Extensions loaded: absorb, blackbox, evolve 10.3.3, extdiff, fastannotate, fix, mercurial_keyring, mq, phabblocker
20210126, phabricator, rebase, show, strip, topic 0.22.3
Traceback (most recent call last):
File "mercurial.lock", line 279, in _trylock
File "mercurial.vfs", line 202, in makelock
File "mercurial.util", line 2147, in makelock
FileExistsError: [WinError 183] Cannot create a file when that file already exists: b'hp-omen:78348' -> b'C:\\Users\\Matt\\hg/.hg/store/lock'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<string>", line 24, in <module>
File "mercurial.dispatch", line 144, in run
File "mercurial.dispatch", line 250, in dispatch
File "mercurial.dispatch", line 294, in _rundispatch
File "mercurial.dispatch", line 470, in _runcatch
File "mercurial.dispatch", line 480, in _callcatch
File "mercurial.scmutil", line 153, in callcatch
File "mercurial.dispatch", line 460, in _runcatchfunc
File "mercurial.dispatch", line 1273, in _dispatch
File "mercurial.dispatch", line 918, in runcommand
File "mercurial.dispatch", line 1285, in _runcommand
File "mercurial.dispatch", line 1271, in <lambda>
File "mercurial.util", line 1886, in check
File "mercurial.util", line 1886, in check
File "hgext.mq", line 4239, in mqcommand
File "mercurial.util", line 1886, in check
File "mercurial.util", line 1886, in check
File "hgext.phabricator", line 314, in inner
File "hgext.phabricator", line 2222, in phabimport
File "hgext.phabricator", line 2123, in readpatch
File "hgext.phabricator", line 2199, in _write
File "mercurial.localrepo", line 2956, in lock
File "mercurial.localrepo", line 2918, in _lock
File "mercurial.lock", line 152, in trylock
File "mercurial.lock", line 283, in _trylock
File "mercurial.lock", line 314, in _readlock
File "mercurial.vfs", line 221, in readlock
File "mercurial.util", line 2163, in readlock
File "mercurial.windows", line 619, in readlink
ValueError: not a symbolic link
Both exceptions look accurate (the file exists, and the Windows side can't read
WSL side symlinks). I didn't try to reproduce this entirely within the Windows
side, but we can do better than a cryptic stacktrace. With this change, the
same scenario results in this abort:
abort: C:\Users\Matt\hg/.hg/store/lock: The file cannot be accessed by the system
When both the `push` and `phabimport` are done on the Windows side, it prints a
message about waiting for the lock, and successfully applies the patch after the
push completes.
I'm not sure if there's enough info to be able to convert the abort into the
wait scenario. As it stands now, we don't support symlinks on Windows, which
requires either a UAC Administrator level process or an opt-in in developer
mode, and there are several places where the new symlink on Windows support in
py3 was explicitly disabled in order to get tests to pass quicker.
Differential Revision: https://phab.mercurial-scm.org/D11333
from __future__ import absolute_import
import binascii
import itertools
import silenttestrunner
import unittest
import zlib
from mercurial.node import sha1nodeconstants
from mercurial import (
manifest as manifestmod,
match as matchmod,
util,
)
EMTPY_MANIFEST = b''
HASH_1 = b'1' * 40
BIN_HASH_1 = binascii.unhexlify(HASH_1)
HASH_2 = b'f' * 40
BIN_HASH_2 = binascii.unhexlify(HASH_2)
HASH_3 = b'1234567890abcdef0987654321deadbeef0fcafe'
BIN_HASH_3 = binascii.unhexlify(HASH_3)
A_SHORT_MANIFEST = (
b'bar/baz/qux.py\0%(hash2)s%(flag2)s\n' b'foo\0%(hash1)s%(flag1)s\n'
) % {
b'hash1': HASH_1,
b'flag1': b'',
b'hash2': HASH_2,
b'flag2': b'l',
}
A_DEEPER_MANIFEST = (
b'a/b/c/bar.py\0%(hash3)s%(flag1)s\n'
b'a/b/c/bar.txt\0%(hash1)s%(flag1)s\n'
b'a/b/c/foo.py\0%(hash3)s%(flag1)s\n'
b'a/b/c/foo.txt\0%(hash2)s%(flag2)s\n'
b'a/b/d/baz.py\0%(hash3)s%(flag1)s\n'
b'a/b/d/qux.py\0%(hash1)s%(flag2)s\n'
b'a/b/d/ten.txt\0%(hash3)s%(flag2)s\n'
b'a/b/dog.py\0%(hash3)s%(flag1)s\n'
b'a/b/fish.py\0%(hash2)s%(flag1)s\n'
b'a/c/london.py\0%(hash3)s%(flag2)s\n'
b'a/c/paper.txt\0%(hash2)s%(flag2)s\n'
b'a/c/paris.py\0%(hash2)s%(flag1)s\n'
b'a/d/apple.py\0%(hash3)s%(flag1)s\n'
b'a/d/pizza.py\0%(hash3)s%(flag2)s\n'
b'a/green.py\0%(hash1)s%(flag2)s\n'
b'a/purple.py\0%(hash2)s%(flag1)s\n'
b'app.py\0%(hash3)s%(flag1)s\n'
b'readme.txt\0%(hash2)s%(flag1)s\n'
) % {
b'hash1': HASH_1,
b'flag1': b'',
b'hash2': HASH_2,
b'flag2': b'l',
b'hash3': HASH_3,
}
HUGE_MANIFEST_ENTRIES = 200001
izip = getattr(itertools, 'izip', zip)
if 'xrange' not in globals():
xrange = range
A_HUGE_MANIFEST = b''.join(
sorted(
b'file%d\0%s%s\n' % (i, h, f)
for i, h, f in izip(
xrange(200001),
itertools.cycle((HASH_1, HASH_2)),
itertools.cycle((b'', b'x', b'l')),
)
)
)
class basemanifesttests(object):
def parsemanifest(self, text):
raise NotImplementedError('parsemanifest not implemented by test case')
def testEmptyManifest(self):
m = self.parsemanifest(20, EMTPY_MANIFEST)
self.assertEqual(0, len(m))
self.assertEqual([], list(m))
def testManifest(self):
m = self.parsemanifest(20, A_SHORT_MANIFEST)
self.assertEqual([b'bar/baz/qux.py', b'foo'], list(m))
self.assertEqual(BIN_HASH_2, m[b'bar/baz/qux.py'])
self.assertEqual(b'l', m.flags(b'bar/baz/qux.py'))
self.assertEqual(BIN_HASH_1, m[b'foo'])
self.assertEqual(b'', m.flags(b'foo'))
with self.assertRaises(KeyError):
m[b'wat']
def testSetItem(self):
want = BIN_HASH_1
m = self.parsemanifest(20, EMTPY_MANIFEST)
m[b'a'] = want
self.assertIn(b'a', m)
self.assertEqual(want, m[b'a'])
self.assertEqual(b'a\0' + HASH_1 + b'\n', m.text())
m = self.parsemanifest(20, A_SHORT_MANIFEST)
m[b'a'] = want
self.assertEqual(want, m[b'a'])
self.assertEqual(b'a\0' + HASH_1 + b'\n' + A_SHORT_MANIFEST, m.text())
def testSetFlag(self):
want = b'x'
m = self.parsemanifest(20, EMTPY_MANIFEST)
# first add a file; a file-less flag makes no sense
m[b'a'] = BIN_HASH_1
m.setflag(b'a', want)
self.assertEqual(want, m.flags(b'a'))
self.assertEqual(b'a\0' + HASH_1 + want + b'\n', m.text())
m = self.parsemanifest(20, A_SHORT_MANIFEST)
# first add a file; a file-less flag makes no sense
m[b'a'] = BIN_HASH_1
m.setflag(b'a', want)
self.assertEqual(want, m.flags(b'a'))
self.assertEqual(
b'a\0' + HASH_1 + want + b'\n' + A_SHORT_MANIFEST, m.text()
)
def testCopy(self):
m = self.parsemanifest(20, A_SHORT_MANIFEST)
m[b'a'] = BIN_HASH_1
m2 = m.copy()
del m
del m2 # make sure we don't double free() anything
def testCompaction(self):
unhex = binascii.unhexlify
h1, h2 = unhex(HASH_1), unhex(HASH_2)
m = self.parsemanifest(20, A_SHORT_MANIFEST)
m[b'alpha'] = h1
m[b'beta'] = h2
del m[b'foo']
want = b'alpha\0%s\nbar/baz/qux.py\0%sl\nbeta\0%s\n' % (
HASH_1,
HASH_2,
HASH_2,
)
self.assertEqual(want, m.text())
self.assertEqual(3, len(m))
self.assertEqual([b'alpha', b'bar/baz/qux.py', b'beta'], list(m))
self.assertEqual(h1, m[b'alpha'])
self.assertEqual(h2, m[b'bar/baz/qux.py'])
self.assertEqual(h2, m[b'beta'])
self.assertEqual(b'', m.flags(b'alpha'))
self.assertEqual(b'l', m.flags(b'bar/baz/qux.py'))
self.assertEqual(b'', m.flags(b'beta'))
with self.assertRaises(KeyError):
m[b'foo']
def testMatchException(self):
m = self.parsemanifest(20, A_SHORT_MANIFEST)
match = matchmod.match(util.localpath(b'/repo'), b'', [b're:.*'])
def filt(path):
if path == b'foo':
assert False
return True
match.matchfn = filt
with self.assertRaises(AssertionError):
m._matches(match)
def testRemoveItem(self):
m = self.parsemanifest(20, A_SHORT_MANIFEST)
del m[b'foo']
with self.assertRaises(KeyError):
m[b'foo']
self.assertEqual(1, len(m))
self.assertEqual(1, len(list(m)))
# now restore and make sure everything works right
m[b'foo'] = b'a' * 20
self.assertEqual(2, len(m))
self.assertEqual(2, len(list(m)))
def testManifestDiff(self):
MISSING = (None, b'')
addl = b'z-only-in-left\0' + HASH_1 + b'\n'
addr = b'z-only-in-right\0' + HASH_2 + b'x\n'
left = self.parsemanifest(
20, A_SHORT_MANIFEST.replace(HASH_1, HASH_3 + b'x') + addl
)
right = self.parsemanifest(20, A_SHORT_MANIFEST + addr)
want = {
b'foo': ((BIN_HASH_3, b'x'), (BIN_HASH_1, b'')),
b'z-only-in-left': ((BIN_HASH_1, b''), MISSING),
b'z-only-in-right': (MISSING, (BIN_HASH_2, b'x')),
}
self.assertEqual(want, left.diff(right))
want = {
b'bar/baz/qux.py': (MISSING, (BIN_HASH_2, b'l')),
b'foo': (MISSING, (BIN_HASH_3, b'x')),
b'z-only-in-left': (MISSING, (BIN_HASH_1, b'')),
}
self.assertEqual(
want, self.parsemanifest(20, EMTPY_MANIFEST).diff(left)
)
want = {
b'bar/baz/qux.py': ((BIN_HASH_2, b'l'), MISSING),
b'foo': ((BIN_HASH_3, b'x'), MISSING),
b'z-only-in-left': ((BIN_HASH_1, b''), MISSING),
}
self.assertEqual(
want, left.diff(self.parsemanifest(20, EMTPY_MANIFEST))
)
copy = right.copy()
del copy[b'z-only-in-right']
del right[b'foo']
want = {
b'foo': (MISSING, (BIN_HASH_1, b'')),
b'z-only-in-right': ((BIN_HASH_2, b'x'), MISSING),
}
self.assertEqual(want, right.diff(copy))
short = self.parsemanifest(20, A_SHORT_MANIFEST)
pruned = short.copy()
del pruned[b'foo']
want = {
b'foo': ((BIN_HASH_1, b''), MISSING),
}
self.assertEqual(want, short.diff(pruned))
want = {
b'foo': (MISSING, (BIN_HASH_1, b'')),
}
self.assertEqual(want, pruned.diff(short))
want = {
b'bar/baz/qux.py': None,
b'foo': (MISSING, (BIN_HASH_1, b'')),
}
self.assertEqual(want, pruned.diff(short, clean=True))
def testReversedLines(self):
backwards = b''.join(
l + b'\n' for l in reversed(A_SHORT_MANIFEST.split(b'\n')) if l
)
try:
self.parsemanifest(20, backwards)
self.fail('Should have raised ValueError')
except ValueError as v:
self.assertIn('Manifest lines not in sorted order.', str(v))
def testNoTerminalNewline(self):
try:
self.parsemanifest(20, A_SHORT_MANIFEST + b'wat')
self.fail('Should have raised ValueError')
except ValueError as v:
self.assertIn('Manifest did not end in a newline.', str(v))
def testNoNewLineAtAll(self):
try:
self.parsemanifest(20, b'wat')
self.fail('Should have raised ValueError')
except ValueError as v:
self.assertIn('Manifest did not end in a newline.', str(v))
def testHugeManifest(self):
m = self.parsemanifest(20, A_HUGE_MANIFEST)
self.assertEqual(HUGE_MANIFEST_ENTRIES, len(m))
self.assertEqual(len(m), len(list(m)))
def testMatchesMetadata(self):
"""Tests matches() for a few specific files to make sure that both
the set of files as well as their flags and nodeids are correct in
the resulting manifest."""
m = self.parsemanifest(20, A_HUGE_MANIFEST)
match = matchmod.exact([b'file1', b'file200', b'file300'])
m2 = m._matches(match)
w = (b'file1\0%sx\n' b'file200\0%sl\n' b'file300\0%s\n') % (
HASH_2,
HASH_1,
HASH_1,
)
self.assertEqual(w, m2.text())
def testMatchesNonexistentFile(self):
"""Tests matches() for a small set of specific files, including one
nonexistent file to make sure in only matches against existing files.
"""
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.exact(
[b'a/b/c/bar.txt', b'a/b/d/qux.py', b'readme.txt', b'nonexistent']
)
m2 = m._matches(match)
self.assertEqual(
[b'a/b/c/bar.txt', b'a/b/d/qux.py', b'readme.txt'], m2.keys()
)
def testMatchesNonexistentDirectory(self):
"""Tests matches() for a relpath match on a directory that doesn't
actually exist."""
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.match(
util.localpath(b'/repo'), b'', [b'a/f'], default=b'relpath'
)
m2 = m._matches(match)
self.assertEqual([], m2.keys())
def testMatchesExactLarge(self):
"""Tests matches() for files matching a large list of exact files."""
m = self.parsemanifest(20, A_HUGE_MANIFEST)
flist = m.keys()[80:300]
match = matchmod.exact(flist)
m2 = m._matches(match)
self.assertEqual(flist, m2.keys())
def testMatchesFull(self):
'''Tests matches() for what should be a full match.'''
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.match(util.localpath(b'/repo'), b'', [b''])
m2 = m._matches(match)
self.assertEqual(m.keys(), m2.keys())
def testMatchesDirectory(self):
"""Tests matches() on a relpath match on a directory, which should
match against all files within said directory."""
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.match(
util.localpath(b'/repo'), b'', [b'a/b'], default=b'relpath'
)
m2 = m._matches(match)
self.assertEqual(
[
b'a/b/c/bar.py',
b'a/b/c/bar.txt',
b'a/b/c/foo.py',
b'a/b/c/foo.txt',
b'a/b/d/baz.py',
b'a/b/d/qux.py',
b'a/b/d/ten.txt',
b'a/b/dog.py',
b'a/b/fish.py',
],
m2.keys(),
)
def testMatchesExactPath(self):
"""Tests matches() on an exact match on a directory, which should
result in an empty manifest because you can't perform an exact match
against a directory."""
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.exact([b'a/b'])
m2 = m._matches(match)
self.assertEqual([], m2.keys())
def testMatchesCwd(self):
"""Tests matches() on a relpath match with the current directory ('.')
when not in the root directory."""
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.match(
util.localpath(b'/repo'), b'a/b', [b'.'], default=b'relpath'
)
m2 = m._matches(match)
self.assertEqual(
[
b'a/b/c/bar.py',
b'a/b/c/bar.txt',
b'a/b/c/foo.py',
b'a/b/c/foo.txt',
b'a/b/d/baz.py',
b'a/b/d/qux.py',
b'a/b/d/ten.txt',
b'a/b/dog.py',
b'a/b/fish.py',
],
m2.keys(),
)
def testMatchesWithPattern(self):
"""Tests matches() for files matching a pattern that reside
deeper than the specified directory."""
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
match = matchmod.match(util.localpath(b'/repo'), b'', [b'a/b/*/*.txt'])
m2 = m._matches(match)
self.assertEqual(
[b'a/b/c/bar.txt', b'a/b/c/foo.txt', b'a/b/d/ten.txt'], m2.keys()
)
class testmanifestdict(unittest.TestCase, basemanifesttests):
def parsemanifest(self, nodelen, text):
return manifestmod.manifestdict(nodelen, text)
def testManifestLongHashes(self):
m = self.parsemanifest(32, b'a\0' + b'f' * 64 + b'\n')
self.assertEqual(binascii.unhexlify(b'f' * 64), m[b'a'])
def testObviouslyBogusManifest(self):
# This is a 163k manifest that came from oss-fuzz. It was a
# timeout there, but when run normally it doesn't seem to
# present any particular slowness.
data = zlib.decompress(
b'x\x9c\xed\xce;\n\x83\x00\x10\x04\xd0\x8deNa\x93~\xf1\x03\xc9q\xf4'
b'\x14\xeaU\xbdB\xda\xd4\xe6Cj\xc1FA\xde+\x86\xe9f\xa2\xfci\xbb\xfb'
b'\xa3\xef\xea\xba\xca\x7fk\x86q\x9a\xc6\xc8\xcc&\xb3\xcf\xf8\xb8|#'
b'\x8a9\x00\xd8\xe6v\xf4\x01N\xe1\n\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\xc0\x8aey\x1d}\x01\xd8\xe0\xb9\xf3\xde\x1b\xcf\x17'
b'\xac\xbe'
)
with self.assertRaises(ValueError):
self.parsemanifest(20, data)
class testtreemanifest(unittest.TestCase, basemanifesttests):
def parsemanifest(self, nodelen, text):
return manifestmod.treemanifest(sha1nodeconstants, b'', text)
def testWalkSubtrees(self):
m = self.parsemanifest(20, A_DEEPER_MANIFEST)
dirs = [s._dir for s in m.walksubtrees()]
self.assertEqual(
sorted(
[b'', b'a/', b'a/c/', b'a/d/', b'a/b/', b'a/b/c/', b'a/b/d/']
),
sorted(dirs),
)
match = matchmod.match(util.localpath(b'/repo'), b'', [b'path:a/b/'])
dirs = [s._dir for s in m.walksubtrees(matcher=match)]
self.assertEqual(sorted([b'a/b/', b'a/b/c/', b'a/b/d/']), sorted(dirs))
if __name__ == '__main__':
silenttestrunner.main(__name__)