Mercurial > hg
view tests/test-parseindex.t @ 44667:b561f3a68e41 stable
discovery: avoid wrongly saying there are nothing to pull
We can get in a situation where a revision passed through `hg pull --rev REV`
are available on the server, but not a descendant of the advertised server
heads.
For example the server could lying be during heads advertisement, to hide some
pull request. Or obsolete/hidden content could be explicitly pulled.
So in this case the lookup associated to `REV` returned successfully, but the
normal discovery will find all advertised heads already known locally. This flip
a special boolean `anyinc` that will prevent any fetch attempt, preventing `REV`
to be pulled over.
We add three line of code to detect this case and make sure a pull actually
happens.
My main target is to make some third party extensions happy (I expect the
associated test to move upstream with the extension). However this fix already
make some of the `infinitepush` test happier.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Mon, 06 Apr 2020 00:24:57 +0200 |
parents | 3518da504303 |
children | 61e7464477ac |
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revlog.parseindex must be able to parse the index file even if an index entry is split between two 64k blocks. The ideal test would be to create an index file with inline data where 64k < size < 64k + 64 (64k is the size of the read buffer, 64 is the size of an index entry) and with an index entry starting right before the 64k block boundary, and try to read it. We approximate that by reducing the read buffer to 1 byte. $ hg init a $ cd a $ echo abc > foo $ hg add foo $ hg commit -m 'add foo' $ echo >> foo $ hg commit -m 'change foo' $ hg log -r 0: changeset: 0:7c31755bf9b5 user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: add foo changeset: 1:26333235a41c tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: change foo $ cat >> test.py << EOF > from __future__ import print_function > from mercurial import changelog, node, pycompat, vfs > > class singlebyteread(object): > def __init__(self, real): > self.real = real > > def read(self, size=-1): > if size == 65536: > size = 1 > return self.real.read(size) > > def __getattr__(self, key): > return getattr(self.real, key) > > def __enter__(self): > self.real.__enter__() > return self > > def __exit__(self, *args, **kwargs): > return self.real.__exit__(*args, **kwargs) > > def opener(*args): > o = vfs.vfs(*args) > def wrapper(*a, **kwargs): > f = o(*a, **kwargs) > return singlebyteread(f) > wrapper.options = o.options > return wrapper > > cl = changelog.changelog(opener(b'.hg/store')) > print(len(cl), 'revisions:') > for r in cl: > print(pycompat.sysstr(node.short(cl.node(r)))) > EOF $ "$PYTHON" test.py 2 revisions: 7c31755bf9b5 26333235a41c $ cd .. #if no-pure Test SEGV caused by bad revision passed to reachableroots() (issue4775): $ cd a $ "$PYTHON" <<EOF > from __future__ import print_function > from mercurial import changelog, vfs > cl = changelog.changelog(vfs.vfs(b'.hg/store')) > print('good heads:') > for head in [0, len(cl) - 1, -1]: > print('%s: %r' % (head, cl.reachableroots(0, [head], [0]))) > print('bad heads:') > for head in [len(cl), 10000, -2, -10000, None]: > print('%s:' % head, end=' ') > try: > cl.reachableroots(0, [head], [0]) > print('uncaught buffer overflow?') > except (IndexError, TypeError) as inst: > print(inst) > print('good roots:') > for root in [0, len(cl) - 1, -1]: > print('%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root]))) > print('out-of-range roots are ignored:') > for root in [len(cl), 10000, -2, -10000]: > print('%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root]))) > print('bad roots:') > for root in [None]: > print('%s:' % root, end=' ') > try: > cl.reachableroots(root, [len(cl) - 1], [root]) > print('uncaught error?') > except TypeError as inst: > print(inst) > EOF good heads: 0: [0] 1: [0] -1: [] bad heads: 2: head out of range 10000: head out of range -2: head out of range -10000: head out of range None: an integer is required( .got type NoneType.)? (re) good roots: 0: [0] 1: [1] -1: [-1] out-of-range roots are ignored: 2: [] 10000: [] -2: [] -10000: [] bad roots: None: an integer is required( .got type NoneType.)? (re) $ cd .. Test corrupted p1/p2 fields that could cause SEGV at parsers.c: $ mkdir invalidparent $ cd invalidparent $ hg clone --pull -q --config phases.publish=False ../a limit --config format.sparse-revlog=no $ hg clone --pull -q --config phases.publish=False ../a neglimit --config format.sparse-revlog=no $ hg clone --pull -q --config phases.publish=False ../a segv --config format.sparse-revlog=no $ rm -R limit/.hg/cache neglimit/.hg/cache segv/.hg/cache $ "$PYTHON" <<EOF > data = open("limit/.hg/store/00changelog.i", "rb").read() > poisons = [ > (b'limit', b'\0\0\0\x02'), > (b'neglimit', b'\xff\xff\xff\xfe'), > (b'segv', b'\0\x01\0\0'), > ] > for n, p in poisons: > # corrupt p1 at rev0 and p2 at rev1 > d = data[:24] + p + data[28:127 + 28] + p + data[127 + 32:] > open(n + b"/.hg/store/00changelog.i", "wb").write(d) > EOF $ hg -R limit debugrevlogindex -f1 -c rev flag size link p1 p2 nodeid 0 0000 62 0 2 -1 7c31755bf9b5 1 0000 65 1 0 2 26333235a41c $ hg -R limit debugdeltachain -c rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio 0 1 1 -1 base 63 62 63 1.01613 63 0 0.00000 1 2 1 -1 base 66 65 66 1.01538 66 0 0.00000 $ hg -R neglimit debugrevlogindex -f1 -c rev flag size link p1 p2 nodeid 0 0000 62 0 -2 -1 7c31755bf9b5 1 0000 65 1 0 -2 26333235a41c $ hg -R segv debugrevlogindex -f1 -c rev flag size link p1 p2 nodeid 0 0000 62 0 65536 -1 7c31755bf9b5 1 0000 65 1 0 65536 26333235a41c $ hg -R segv debugdeltachain -c rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio 0 1 1 -1 base 63 62 63 1.01613 63 0 0.00000 1 2 1 -1 base 66 65 66 1.01538 66 0 0.00000 $ cat <<EOF > test.py > from __future__ import print_function > import sys > from mercurial import changelog, pycompat, vfs > cl = changelog.changelog(vfs.vfs(pycompat.fsencode(sys.argv[1]))) > n0, n1 = cl.node(0), cl.node(1) > ops = [ > ('reachableroots', > lambda: cl.index.reachableroots2(0, [1], [0], False)), > ('compute_phases_map_sets', lambda: cl.computephases([[0], []])), > ('index_headrevs', lambda: cl.headrevs()), > ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)), > ('find_deepest', lambda: cl.ancestor(n0, n1)), > ] > for l, f in ops: > print(l + ':', end=' ') > try: > f() > print('uncaught buffer overflow?') > except ValueError as inst: > print(inst) > EOF $ "$PYTHON" test.py limit/.hg/store reachableroots: parent out of range compute_phases_map_sets: parent out of range index_headrevs: parent out of range find_gca_candidates: parent out of range find_deepest: parent out of range $ "$PYTHON" test.py neglimit/.hg/store reachableroots: parent out of range compute_phases_map_sets: parent out of range index_headrevs: parent out of range find_gca_candidates: parent out of range find_deepest: parent out of range $ "$PYTHON" test.py segv/.hg/store reachableroots: parent out of range compute_phases_map_sets: parent out of range index_headrevs: parent out of range find_gca_candidates: parent out of range find_deepest: parent out of range $ cd .. #endif