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localrepo: strip now incrementally updates the branchheads cache...

localrepo: strip now incrementally updates the branchheads cache Destroying history via strip used to invalidate the branchheads cache, causing it to be regenerated the next time it is read. This is expensive in large repos. This change converts strip to pass info to localrepo.destroyed() to enable to it to incrementally update the cache, improving the performance of strip and other operations that depend on it (e.g., rebase). This change also strengthens a bit the integrity checking of the branchheads cache when it is read, by rejecting the cache if it has nodes in it that no longer exist.

Matt Mackall - - Load All Authors

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      http://mercurial.selenic.com/bts/issue2137

      Setup:

      create a little extension that has 3 side-effects:

      1) ensure changelog data is not inlined

      2) make revlog to use lazyparser

      3) test that repo.lookup() works

      1 and 2 are preconditions for the bug; 3 is the bug.

        $ cat > commitwrapper.py <<EOF

        > from mercurial import extensions, node, revlog

        > 

        > def reposetup(ui, repo):

        >     def wrapcommit(orig, *args, **kwargs):

        >         result = orig(*args, **kwargs)

        >         tip1 = node.short(repo.changelog.tip())

        >         tip2 = node.short(repo.lookup(tip1))

        >         assert tip1 == tip2

        >         ui.write('new tip: %s\n' % tip1)

        >         return result

        > 

        >     extensions.wrapfunction(repo, 'commit', wrapcommit)

        > 

        > def extsetup(ui):

        >     revlog._maxinline = 8             # split out 00changelog.d early

        >     revlog._prereadsize = 8           # use revlog.lazyparser

        > EOF

        $ cat >> $HGRCPATH <<EOF

        > [extensions]

        > commitwrapper = `pwd`/commitwrapper.py

        > EOF

        $ hg init repo1

        $ cd repo1

        $ echo a > a

        $ hg commit -A -m'add a with a long commit message to make the changelog a bit bigger'

        adding a

        new tip: 553596fad57b

      Test that new changesets are visible to repo.lookup():

        $ echo a >> a

        $ hg commit -m'one more commit to demonstrate the bug'

        new tip: 799ae3599e0e

        $ hg tip

        changeset:   1:799ae3599e0e

        tag:         tip

        user:        test

        date:        Thu Jan 01 00:00:00 1970 +0000

        summary:     one more commit to demonstrate the bug

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				http://mercurial.selenic.com/bts/issue2137

				Setup:

				create a little extension that has 3 side-effects:
				1) ensure changelog data is not inlined
				2) make revlog to use lazyparser
				3) test that repo.lookup() works
				1 and 2 are preconditions for the bug; 3 is the bug.

				$ cat > commitwrapper.py <<EOF
				> from mercurial import extensions, node, revlog
				>
				> def reposetup(ui, repo):
				> def wrapcommit(orig, args, *kwargs):
				> result = orig(args, *kwargs)
				> tip1 = node.short(repo.changelog.tip())
				> tip2 = node.short(repo.lookup(tip1))
				> assert tip1 == tip2
				> ui.write('new tip: %s\n' % tip1)
				> return result
				>
				> extensions.wrapfunction(repo, 'commit', wrapcommit)
				>
				> def extsetup(ui):
				> revlog._maxinline = 8 # split out 00changelog.d early
				> revlog._prereadsize = 8 # use revlog.lazyparser
				> EOF

				$ cat >> $HGRCPATH <<EOF
				> [extensions]
				> commitwrapper = `pwd`/commitwrapper.py
				> EOF

				$ hg init repo1
				$ cd repo1
				$ echo a > a
				$ hg commit -A -m'add a with a long commit message to make the changelog a bit bigger'
				adding a
				new tip: 553596fad57b

				Test that new changesets are visible to repo.lookup():

				$ echo a >> a
				$ hg commit -m'one more commit to demonstrate the bug'
				new tip: 799ae3599e0e

				$ hg tip
				changeset: 1:799ae3599e0e
				tag: tip
				user: test
				date: Thu Jan 01 00:00:00 1970 +0000
				summary: one more commit to demonstrate the bug