tests/test-parseindex.t
author Augie Fackler <augie@google.com>
Sun, 18 Feb 2018 00:03:27 -0500
changeset 36296 d18c0cf5f3ab
parent 35966 8140ce44dec4
child 37280 435481393198
permissions -rw-r--r--
hgweb: header dict entries are native strings # skip-blame just marking some native strings Differential Revision: https://phab.mercurial-scm.org/D2312
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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revlog.parseindex must be able to parse the index file even if
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an index entry is split between two 64k blocks.  The ideal test
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would be to create an index file with inline data where
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64k < size < 64k + 64 (64k is the size of the read buffer, 64 is
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the size of an index entry) and with an index entry starting right
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before the 64k block boundary, and try to read it.
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We approximate that by reducing the read buffer to 1 byte.
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  $ hg init a
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  $ cd a
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  $ echo abc > foo
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  $ hg add foo
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  $ hg commit -m 'add foo'
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  $ echo >> foo
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  $ hg commit -m 'change foo'
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  $ hg log -r 0:
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  changeset:   0:7c31755bf9b5
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  user:        test
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  date:        Thu Jan 01 00:00:00 1970 +0000
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  summary:     add foo
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  changeset:   1:26333235a41c
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  tag:         tip
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  user:        test
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  date:        Thu Jan 01 00:00:00 1970 +0000
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  summary:     change foo
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  $ cat >> test.py << EOF
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  > from mercurial import changelog, vfs
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  > from mercurial.node import *
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  > 
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  > class singlebyteread(object):
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  >     def __init__(self, real):
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  >         self.real = real
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  > 
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  >     def read(self, size=-1):
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  >         if size == 65536:
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  >             size = 1
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  >         return self.real.read(size)
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  > 
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  >     def __getattr__(self, key):
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  >         return getattr(self.real, key)
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  > 
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  >     def __enter__(self):
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  >         self.real.__enter__()
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  >         return self
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  > 
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  >     def __exit__(self, *args, **kwargs):
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  >         return self.real.__exit__(*args, **kwargs)
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  > 
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  > def opener(*args):
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  >     o = vfs.vfs(*args)
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  >     def wrapper(*a, **kwargs):
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  >         f = o(*a, **kwargs)
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  >         return singlebyteread(f)
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  >     return wrapper
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  > 
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  > cl = changelog.changelog(opener('.hg/store'))
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  > print len(cl), 'revisions:'
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  > for r in cl:
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  >     print short(cl.node(r))
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  > EOF
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  $ $PYTHON test.py
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  2 revisions:
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  7c31755bf9b5
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  26333235a41c
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  $ cd ..
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#if no-pure
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Test SEGV caused by bad revision passed to reachableroots() (issue4775):
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  $ cd a
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  $ $PYTHON <<EOF
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  > from mercurial import changelog, vfs
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  > cl = changelog.changelog(vfs.vfs('.hg/store'))
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  > print 'good heads:'
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  > for head in [0, len(cl) - 1, -1]:
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  >     print'%s: %r' % (head, cl.reachableroots(0, [head], [0]))
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  > print 'bad heads:'
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  > for head in [len(cl), 10000, -2, -10000, None]:
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  >     print '%s:' % head,
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  >     try:
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  >         cl.reachableroots(0, [head], [0])
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  >         print 'uncaught buffer overflow?'
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  >     except (IndexError, TypeError) as inst:
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  >         print inst
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  > print 'good roots:'
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  > for root in [0, len(cl) - 1, -1]:
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  >     print '%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root]))
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  > print 'out-of-range roots are ignored:'
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  > for root in [len(cl), 10000, -2, -10000]:
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  >     print '%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root]))
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  > print 'bad roots:'
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  > for root in [None]:
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  >     print '%s:' % root,
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  >     try:
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  >         cl.reachableroots(root, [len(cl) - 1], [root])
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  >         print 'uncaught error?'
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  >     except TypeError as inst:
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  >         print inst
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  > EOF
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  good heads:
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  0: [0]
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  1: [0]
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  -1: []
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  bad heads:
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  2: head out of range
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  10000: head out of range
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  -2: head out of range
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  -10000: head out of range
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  None: an integer is required
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  good roots:
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  0: [0]
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  1: [1]
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  -1: [-1]
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  out-of-range roots are ignored:
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  2: []
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  10000: []
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  -2: []
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  -10000: []
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  bad roots:
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  None: an integer is required
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  $ cd ..
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Test corrupted p1/p2 fields that could cause SEGV at parsers.c:
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  $ mkdir invalidparent
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  $ cd invalidparent
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  $ hg clone --pull -q --config phases.publish=False ../a limit
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  $ hg clone --pull -q --config phases.publish=False ../a segv
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  $ rm -R limit/.hg/cache segv/.hg/cache
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  $ $PYTHON <<EOF
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  > data = open("limit/.hg/store/00changelog.i", "rb").read()
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  > for n, p in [('limit', '\0\0\0\x02'), ('segv', '\0\x01\0\0')]:
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  >     # corrupt p1 at rev0 and p2 at rev1
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  >     d = data[:24] + p + data[28:127 + 28] + p + data[127 + 32:]
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  >     open(n + "/.hg/store/00changelog.i", "wb").write(d)
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  > EOF
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   145
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  $ hg debugindex -f1 limit/.hg/store/00changelog.i
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     rev flag   offset   length     size   base   link     p1     p2       nodeid
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       0 0000        0       63       62      0      0      2     -1 7c31755bf9b5
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       1 0000       63       66       65      1      1      0      2 26333235a41c
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  $ hg debugindex -f1 segv/.hg/store/00changelog.i
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     rev flag   offset   length     size   base   link     p1     p2       nodeid
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       0 0000        0       63       62      0      0  65536     -1 7c31755bf9b5
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       1 0000       63       66       65      1      1      0  65536 26333235a41c
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  $ cat <<EOF > test.py
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  > import sys
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  > from mercurial import changelog, vfs
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  > cl = changelog.changelog(vfs.vfs(sys.argv[1]))
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  > n0, n1 = cl.node(0), cl.node(1)
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  > ops = [
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  >     ('reachableroots',
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  >      lambda: cl.index.reachableroots2(0, [1], [0], False)),
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  >     ('compute_phases_map_sets', lambda: cl.computephases([[0], []])),
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  >     ('index_headrevs', lambda: cl.headrevs()),
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  >     ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)),
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  >     ('find_deepest', lambda: cl.ancestor(n0, n1)),
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  >     ]
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  > for l, f in ops:
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  >     print l + ':',
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  >     try:
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  >         f()
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  >         print 'uncaught buffer overflow?'
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  >     except ValueError, inst:
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  >         print inst
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  > EOF
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  $ $PYTHON test.py limit/.hg/store
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  reachableroots: parent out of range
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  compute_phases_map_sets: parent out of range
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  index_headrevs: parent out of range
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  find_gca_candidates: parent out of range
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  find_deepest: parent out of range
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  $ $PYTHON test.py segv/.hg/store
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  reachableroots: parent out of range
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  compute_phases_map_sets: parent out of range
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  index_headrevs: parent out of range
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  find_gca_candidates: parent out of range
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  find_deepest: parent out of range
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  $ cd ..
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   192
#endif