/brz/remove-bazaar

# Copyright (C) 2006 by Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Benchmark test suite for bzr."""

import errno

import os

import shutil

from bzrlib import (

    add,

    bzrdir,

    osutils,

    plugin,

    workingtree,

    )

from bzrlib.tests.TestUtil import TestLoader

from bzrlib.tests.blackbox import ExternalBase

class Benchmark(ExternalBase):

    CACHE_ROOT = None

    def get_cache_dir(self, extra):

        """Get the directory to use for caching the given object.

        :return: (cache_dir, is_cached)

            cache_dir: The path to use for caching. If None, caching is disabled

            is_cached: Has the path already been created?

        """

        if Benchmark.CACHE_ROOT is None:

            return None, False

        if not os.path.isdir(Benchmark.CACHE_ROOT):

            os.mkdir(Benchmark.CACHE_ROOT)

        cache_dir = osutils.pathjoin(self.CACHE_ROOT, extra)

        return cache_dir, os.path.exists(cache_dir)

    def make_kernel_like_tree(self, url=None, root='.',

                              link_working=False):

        """Setup a temporary tree roughly like a kernel tree.

        :param url: Creat the kernel like tree as a lightweight checkout

        of a new branch created at url.

        :param link_working: instead of creating a new copy of all files

            just hardlink the working tree. Tests must request this, because

            they must break links if they want to change the files

        """

        if url is not None:

            b = bzrdir.BzrDir.create_branch_convenience(url)

            d = bzrdir.BzrDir.create(root)

            bzrlib.branch.BranchReferenceFormat().initialize(d, b)

            tree = d.create_workingtree()

        else:

            tree = bzrdir.BzrDir.create_standalone_workingtree(root)

        self._link_or_copy_kernel_files(root=root, do_link=link_working)

        return tree

    def _make_kernel_files(self, root='.'):

        # a kernel tree has ~10000 and 500 directory, with most files around 

        # 3-4 levels deep. 

        # we simulate this by three levels of dirs named 0-7, givin 512 dirs,

        # and 20 files each.

        files = []

        for outer in range(8):

            files.append("%s/" % outer)

            for middle in range(8):

                files.append("%s/%s/" % (outer, middle))

                for inner in range(8):

                    prefix = "%s/%s/%s/" % (outer, middle, inner)

                    files.append(prefix)

                    files.extend([prefix + str(foo) for foo in range(20)])

        cwd = osutils.getcwd()

        os.chdir(root)

        self.build_tree(files)

        os.chdir(cwd)

    def _cache_kernel_like_tree(self):

        """Create the kernel_like_tree cache dir if it doesn't exist"""

        cache_dir, is_cached = self.get_cache_dir('kernel_like_tree')

        if cache_dir is None:

            return None

        if is_cached:

            return cache_dir

        os.mkdir(cache_dir)

        self._make_kernel_files(root=cache_dir)

        self._protect_files(cache_dir)

        return cache_dir

    def _link_or_copy_kernel_files(self, root, do_link=True):

        """Hardlink the kernel files from the cached location.

        If the platform doesn't correctly support hardlinking files, it

        reverts to just creating new ones.

        """

        if not osutils.hardlinks_good() or not do_link:

            # Turns out that 'shutil.copytree()' is no faster than

            # just creating them. Probably the python overhead.

            # Plain _make_kernel_files takes 5s

            # cp -a takes 3s

            # using hardlinks takes < 1s.

            self._make_kernel_files(root=root)

            return

        cache_dir = self._cache_kernel_like_tree()

        if cache_dir is None:

            self._make_kernel_files(root=root)

            return

        # Hardlinking the target directory is *much* faster (7s => <1s).

        osutils.copy_tree(cache_dir, root,

                          handlers={'file':os.link})

    def _clone_tree(self, source, dest, link_bzr=False, link_working=True,

                    hot_cache=True):

        """Copy the contents from a given location to another location.

        Optionally hardlink certain pieces of the tree.

        :param source: The directory to copy

        :param dest: The destination

        :param link_bzr: Should the .bzr/ files be hardlinked?

        :param link_working: Should the working tree be hardlinked?

        :param hot_cache: Update the hash-cache when you are done

        """

        # We use shutil.copyfile so that we don't copy permissions

        # because most of our source trees are marked readonly to

        # prevent modifying in the case of hardlinks

        handlers = {'file':shutil.copyfile}

        if osutils.hardlinks_good():

            if link_working:

                if link_bzr:

                    handlers = {'file':os.link}

                else:

                    # Don't hardlink files inside bzr

                    def file_handler(source, dest):

                        if '.bzr/' in source:

                            shutil.copyfile(source, dest)

                        else:

                            os.link(source, dest)

                    handlers = {'file':file_handler}

            elif link_bzr:

                # Only link files inside .bzr/

                def file_handler(source, dest):

                    if '.bzr/' in source:

                        os.link(source, dest)

                    else:

                        shutil.copyfile(source, dest)

                handlers = {'file':file_handler}

        osutils.copy_tree(source, dest, handlers=handlers)

        tree = workingtree.WorkingTree.open(dest)

        if hot_cache:

            tree.lock_write()

            try:

                # tree._hashcache.scan() just checks and removes

                # entries that are out of date

                # we need to actually store new ones

                for path, ie in tree.inventory.iter_entries_by_dir():

                    tree.get_file_sha1(ie.file_id, path)

            finally:

                tree.unlock()

        # If we didn't iterate the tree, the hash cache is technically

        # invalid, and it would be better to remove it, but there is

        # no public api for that.

        return tree

    def _protect_files(self, root):

        """Chmod all files underneath 'root' to prevent writing

        :param root: The base directory to modify

        """

        for dirinfo, entries in osutils.walkdirs(root):

            for relpath, name, kind, st, abspath in entries:

                if kind == 'file':

                    os.chmod(abspath, 0440)

    def _create_kernel_like_added_tree(self, root, in_cache=False):

        """Create a kernel-like tree with the all files added

        :param root: The root directory to create the files

        :param in_cache: Is this being created in the cache dir?

        """

        # Get a basic tree with working files

        tree = self.make_kernel_like_tree(root=root,

                                          link_working=in_cache)

        # Add everything to it

        tree.lock_write()

        try:

            add.smart_add_tree(tree, [root], recurse=True, save=True)

            if in_cache:

                self._protect_files(root+'/.bzr')

        finally:

            tree.unlock()

        return tree

    def make_kernel_like_added_tree(self, root='.',

                                    link_working=True,

                                    hot_cache=True):

        """Make a kernel like tree, with all files added

        :param root: Where to create the files

        :param link_working: Instead of copying all of the working tree

            files, just hardlink them to the cached files. Tests can unlink

            files that they will change.

        :param hot_cache: Run through the newly created tree and make sure

            the stat-cache is correct. The old way of creating a freshly

            added tree always had a hot cache.

        """

        # There isn't much underneath .bzr, so we don't support hardlinking

        # it. Testing showed there wasn't much gain, and there is potentially

        # a problem if someone modifies something underneath us.

        cache_dir, is_cached = self.get_cache_dir('kernel_like_added_tree')

        if cache_dir is None:

            # Not caching

            return self._create_kernel_like_added_tree(root, in_cache=False)

        if not is_cached:

            self._create_kernel_like_added_tree(root=cache_dir,

                                                in_cache=True)

        return self._clone_tree(cache_dir, root,

                                link_working=link_working,

                                hot_cache=hot_cache)

    def _create_kernel_like_committed_tree(self, root, in_cache=False):

        """Create a kernel-like tree with all files added and committed"""

        # Get a basic tree with working files

        tree = self.make_kernel_like_added_tree(root=root,

                                                link_working=in_cache,

                                                hot_cache=(not in_cache))

        tree.commit('first post', rev_id='r1')

        if in_cache:

            self._protect_files(root+'/.bzr')

        return tree

    def make_kernel_like_committed_tree(self, root='.',

                                    link_working=True,

                                    link_bzr=False,

                                    hot_cache=True):

        """Make a kernel like tree, with all files added and committed

        :param root: Where to create the files

        :param link_working: Instead of copying all of the working tree

            files, just hardlink them to the cached files. Tests can unlink

            files that they will change.

        :param link_bzr: Hardlink the .bzr directory. For readonly 

            operations this is safe, and shaves off a lot of setup time

        """

        cache_dir, is_cached = self.get_cache_dir('kernel_like_committed_tree')

        if cache_dir is None:

            return self._create_kernel_like_committed_tree(root=root,

                                                           in_cache=False)

        if not is_cached:

            self._create_kernel_like_committed_tree(root=cache_dir,

                                                    in_cache=True)

        # Now we have a cached tree, just copy it

        return self._clone_tree(cache_dir, root,

                                link_bzr=link_bzr,

                                link_working=link_working,

                                hot_cache=hot_cache)

    def _create_many_commit_tree(self, root, in_cache=False):

        tree = bzrdir.BzrDir.create_standalone_workingtree(root)

        tree.lock_write()

        try:

            for i in xrange(1000):

                tree.commit('no-changes commit %d' % i)

        finally:

            tree.unlock()

        if in_cache:

            self._protect_files(root+'/.bzr')

        return tree

    def make_many_commit_tree(self, directory_name='.',

                              hardlink=False):

        """Create a tree with many commits.

        No file changes are included. Not hardlinking the working tree, 

        because there are no working tree files.

        """

        cache_dir, is_cached = self.get_cache_dir('many_commit_tree')

        if cache_dir is None:

            return self._create_many_commit_tree(root=directory_name,

                                                 in_cache=False)

        if not is_cached:

            self._create_many_commit_tree(root=cache_dir, in_cache=True)

        return self._clone_tree(cache_dir, directory_name,

                                link_bzr=hardlink,

                                hot_cache=True)

    def _create_heavily_merged_tree(self, root, in_cache=False):

        try:

            os.mkdir(root)

        except (IOError, OSError), e:

            if e.errno not in (errno.EEXIST,):

                raise

        tree = bzrdir.BzrDir.create_standalone_workingtree(

                root + '/tree1')

        tree.lock_write()

        try:

            tree2 = tree.bzrdir.sprout(root + '/tree2').open_workingtree()

            tree2.lock_write()

            try:

                for i in xrange(250):

                    revision_id = tree.commit('no-changes commit %d-a' % i)

                    tree2.branch.fetch(tree.branch, revision_id)

                    tree2.set_pending_merges([revision_id])

                    revision_id = tree2.commit('no-changes commit %d-b' % i)

                    tree.branch.fetch(tree2.branch, revision_id)

                    tree.set_pending_merges([revision_id])

                tree.set_pending_merges([])

            finally:

                tree2.unlock()

        finally:

            tree.unlock()

        if in_cache:

            self._protect_files(root+'/tree1/.bzr')

        return tree

    def make_heavily_merged_tree(self, directory_name='.',

                                 hardlink=False):

        """Create a tree in which almost every commit is a merge.

        No file changes are included.  This produces two trees, 

        one of which is returned.  Except for the first commit, every

        commit in its revision-history is a merge another commit in the other

        tree.  Not hardlinking the working tree, because there are no working 

        tree files.

        """

        cache_dir, is_cached = self.get_cache_dir('heavily_merged_tree')

        if cache_dir is None:

            # Not caching

            return self._create_heavily_merged_tree(root=directory_name,

                                                    in_cache=False)

        if not is_cached:

            self._create_heavily_merged_tree(root=cache_dir, in_cache=True)

        tree_dir = cache_dir + '/tree1'

        return self._clone_tree(tree_dir, directory_name,

                                link_bzr=hardlink,

                                hot_cache=True)

def test_suite():

    """Build and return a TestSuite which contains benchmark tests only."""

    testmod_names = [ \

                   'bzrlib.benchmarks.bench_add',

                   'bzrlib.benchmarks.bench_bench',

                   'bzrlib.benchmarks.bench_checkout',

                   'bzrlib.benchmarks.bench_commit',

                   'bzrlib.benchmarks.bench_inventory',

                   'bzrlib.benchmarks.bench_log',

                   'bzrlib.benchmarks.bench_osutils',

                   'bzrlib.benchmarks.bench_rocks',

                   'bzrlib.benchmarks.bench_status',

                   'bzrlib.benchmarks.bench_transform',

                   'bzrlib.benchmarks.bench_workingtree',

                   ]

    suite = TestLoader().loadTestsFromModuleNames(testmod_names) 

    # Load any benchmarks from plugins

    for name, module in plugin.all_plugins().items():

        if getattr(module, 'bench_suite', None) is not None:

            suite.addTest(module.bench_suite())

    return suite