upstream/mercurial-mirror Files · tests/test-parseindex.t

verify: check the subrepository references in .hgsubstate...

verify: check the subrepository references in .hgsubstate While hopefully atypical, there are reasons that a subrepository revision can be lost that aren't covered by corruption of the .hgsubstate revlog. Such things can happen when a subrepo is amended, stripped or simply isn't pulled from upstream because the parent repo revision wasn't updated yet. There's no way to know if it is an error, but this will find potential problems sooner than when some random revision is updated. Until recently, convert made no attempt at rewriting the .hgsubstate file. The impetuous for this is to verify the conversion of some repositories, and this is orders of magnitude faster than a bash script from 0..tip that does an 'hg update -C $rev'. But it is equally useful to determine if everything has been pulled down before taking a thumb drive on the go. It feels somewhat wrong to leave this out of verifymod (mostly because the file is already read in there, and the final summary is printed before the subrepos are checked). But verifymod looks very low level, so importing subrepo stuff there seems more wrong.

Mads Kiilerich - - Load All Authors

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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 mercurial import changelog, scmutil

        > from mercurial.node import *

        > 

        > 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 opener(*args):

        >     o = scmutil.opener(*args)

        >     def wrapper(*a):

        >         f = o(*a)

        >         return singlebyteread(f)

        >     return wrapper

        > 

        > cl = changelog.changelog(opener('.hg/store'))

        > print len(cl), 'revisions:'

        > for r in cl:

        >     print short(cl.node(r))

        > EOF

        $ python test.py

        2 revisions:

        7c31755bf9b5

        26333235a41c

        $ cd ..

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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 mercurial import changelog, scmutil
				> from mercurial.node import *
				>
				> 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 opener(*args):
				> o = scmutil.opener(*args)
				> def wrapper(*a):
				> f = o(*a)
				> return singlebyteread(f)
				> return wrapper
				>
				> cl = changelog.changelog(opener('.hg/store'))
				> print len(cl), 'revisions:'
				> for r in cl:
				> print short(cl.node(r))
				> EOF
				$ python test.py
				2 revisions:
				7c31755bf9b5
				26333235a41c

				$ cd ..