Mercurial > hg
view tests/test-verify-repo-operations.py @ 40393:229d23cdb203
exchangev2: support fetching shallow files history
This commit teaches the exchangev2 client code to handle fetching shallow
files data.
Only shallow fetching of files data is supported: shallow fetching of
changeset and manifest data is explicitly not yet supported.
Previously, we would fetch file revisions for changesets that were received
by the current pull operation. In the new model, we calculate the set of
"relevant" changesets given the pull depth and only fetch files data for
those changesets.
We also teach the "filesdata" command invocation to vary parameters as needed.
The implementation here is far from complete or optimal. Subsequent pulls will
end up re-fetching a lot of files data. But the application of this data should
mostly be a no-op on the client, so it isn't a big deal.
Depending on the order file revisions are fetched in, revisions could get
inserted with the wrong revision number relationships. I think the best way
to deal with this is to remove revision numbers from storage and to either
dynamically derive them (by reconstructing a DAG from nodes/parents) or remove
revision numbers from the file storage interface completely.
A missing API that we'll likely want to write pretty soon is "ensure files
for revision(s) are present." We can kind of cajole exchangev2.pull() to do
this. But it isn't very efficient. For example, in simple cases like
widening the store to obtain data for a single revision, it is probably
more efficient to walk the manifest and find exactly which file revisions
are missing and to make explicit requests for just their data. In more
advanced cases, asking the server for all files data may be more efficient,
even though it requires sending data the client already has. There is tons
of room for future experimentation here. And TBH I'm not sure what the
final state will be.
Anyway, this commit gets us pretty close to being able to have shallow
and narrow checkouts with exchangev2/sqlite storage. Close enough that a
minimal extension should be able to provide fill in the gaps until the code
in core stabilizes and there is a user-facing way to trigger the
narrow/shallow bits from `hg clone` without also implying using of the
narrow extension...
Differential Revision: https://phab.mercurial-scm.org/D5169
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Fri, 19 Oct 2018 12:30:49 +0200 |
parents | 8b90367c4cf3 |
children | 2372284d9457 |
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from __future__ import print_function, absolute_import """Fuzz testing for operations against a Mercurial repository This uses Hypothesis's stateful testing to generate random repository operations and test Mercurial using them, both to see if there are any unexpected errors and to compare different versions of it.""" import os import subprocess import sys # Only run if slow tests are allowed if subprocess.call(['python', '%s/hghave' % os.environ['TESTDIR'], 'slow']): sys.exit(80) # These tests require Hypothesis and pytz to be installed. # Running 'pip install hypothesis pytz' will achieve that. # Note: This won't work if you're running Python < 2.7. try: from hypothesis.extra.datetime import datetimes except ImportError: sys.stderr.write("skipped: hypothesis or pytz not installed" + os.linesep) sys.exit(80) # If you are running an old version of pip you may find that the enum34 # backport is not installed automatically. If so 'pip install enum34' will # fix this problem. try: import enum assert enum # Silence pyflakes except ImportError: sys.stderr.write("skipped: enum34 not installed" + os.linesep) sys.exit(80) import binascii from contextlib import contextmanager import errno import pipes import shutil import silenttestrunner import subprocess from hypothesis.errors import HypothesisException from hypothesis.stateful import ( rule, RuleBasedStateMachine, Bundle, precondition) from hypothesis import settings, note, strategies as st from hypothesis.configuration import set_hypothesis_home_dir from hypothesis.database import ExampleDatabase testdir = os.path.abspath(os.environ["TESTDIR"]) # We store Hypothesis examples here rather in the temporary test directory # so that when rerunning a failing test this always results in refinding the # previous failure. This directory is in .hgignore and should not be checked in # but is useful to have for development. set_hypothesis_home_dir(os.path.join(testdir, ".hypothesis")) runtests = os.path.join(os.environ["RUNTESTDIR"], "run-tests.py") testtmp = os.environ["TESTTMP"] assert os.path.isdir(testtmp) generatedtests = os.path.join(testdir, "hypothesis-generated") try: os.makedirs(generatedtests) except OSError: pass # We write out generated .t files to a file in order to ease debugging and to # give a starting point for turning failures Hypothesis finds into normal # tests. In order to ensure that multiple copies of this test can be run in # parallel we use atomic file create to ensure that we always get a unique # name. file_index = 0 while True: file_index += 1 savefile = os.path.join(generatedtests, "test-generated-%d.t" % ( file_index, )) try: os.close(os.open(savefile, os.O_CREAT | os.O_EXCL | os.O_WRONLY)) break except OSError as e: if e.errno != errno.EEXIST: raise assert os.path.exists(savefile) hgrc = os.path.join(".hg", "hgrc") filecharacters = ( "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" "[]^_`;=@{}~ !#$%&'()+,-" ) files = st.text(filecharacters, min_size=1).map(lambda x: x.strip()).filter( bool).map(lambda s: s.encode('ascii')) safetext = st.text(st.characters( min_codepoint=1, max_codepoint=127, blacklist_categories=('Cc', 'Cs')), min_size=1).map( lambda s: s.encode('utf-8') ) extensions = st.sampled_from(('shelve', 'mq', 'blackbox',)) @contextmanager def acceptableerrors(*args): """Sometimes we know an operation we're about to perform might fail, and we're OK with some of the failures. In those cases this may be used as a context manager and will swallow expected failures, as identified by substrings of the error message Mercurial emits.""" try: yield except subprocess.CalledProcessError as e: if not any(a in e.output for a in args): note(e.output) raise reponames = st.text("abcdefghijklmnopqrstuvwxyz01234556789", min_size=1).map( lambda s: s.encode('ascii') ) class verifyingstatemachine(RuleBasedStateMachine): """This defines the set of acceptable operations on a Mercurial repository using Hypothesis's RuleBasedStateMachine. The general concept is that we manage multiple repositories inside a repos/ directory in our temporary test location. Some of these are freshly inited, some are clones of the others. Our current working directory is always inside one of these repositories while the tests are running. Hypothesis then performs a series of operations against these repositories, including hg commands, generating contents and editing the .hgrc file. If these operations fail in unexpected ways or behave differently in different configurations of Mercurial, the test will fail and a minimized .t test file will be written to the hypothesis-generated directory to exhibit that failure. Operations are defined as methods with @rule() decorators. See the Hypothesis documentation at http://hypothesis.readthedocs.org/en/release/stateful.html for more details.""" # A bundle is a reusable collection of previously generated data which may # be provided as arguments to future operations. repos = Bundle('repos') paths = Bundle('paths') contents = Bundle('contents') branches = Bundle('branches') committimes = Bundle('committimes') def __init__(self): super(verifyingstatemachine, self).__init__() self.repodir = os.path.join(testtmp, "repos") if os.path.exists(self.repodir): shutil.rmtree(self.repodir) os.chdir(testtmp) self.log = [] self.failed = False self.configperrepo = {} self.all_extensions = set() self.non_skippable_extensions = set() self.mkdirp("repos") self.cd("repos") self.mkdirp("repo1") self.cd("repo1") self.hg("init") def teardown(self): """On teardown we clean up after ourselves as usual, but we also do some additional testing: We generate a .t file based on our test run using run-test.py -i to get the correct output. We then test it in a number of other configurations, verifying that each passes the same test.""" super(verifyingstatemachine, self).teardown() try: shutil.rmtree(self.repodir) except OSError: pass ttest = os.linesep.join(" " + l for l in self.log) os.chdir(testtmp) path = os.path.join(testtmp, "test-generated.t") with open(path, 'w') as o: o.write(ttest + os.linesep) with open(os.devnull, "w") as devnull: rewriter = subprocess.Popen( [runtests, "--local", "-i", path], stdin=subprocess.PIPE, stdout=devnull, stderr=devnull, ) rewriter.communicate("yes") with open(path, 'r') as i: ttest = i.read() e = None if not self.failed: try: output = subprocess.check_output([ runtests, path, "--local", "--pure" ], stderr=subprocess.STDOUT) assert "Ran 1 test" in output, output for ext in ( self.all_extensions - self.non_skippable_extensions ): tf = os.path.join(testtmp, "test-generated-no-%s.t" % ( ext, )) with open(tf, 'w') as o: for l in ttest.splitlines(): if l.startswith(" $ hg"): l = l.replace( "--config %s=" % ( extensionconfigkey(ext),), "") o.write(l + os.linesep) with open(tf, 'r') as r: t = r.read() assert ext not in t, t output = subprocess.check_output([ runtests, tf, "--local", ], stderr=subprocess.STDOUT) assert "Ran 1 test" in output, output except subprocess.CalledProcessError as e: note(e.output) if self.failed or e is not None: with open(savefile, "wb") as o: o.write(ttest) if e is not None: raise e def execute_step(self, step): try: return super(verifyingstatemachine, self).execute_step(step) except (HypothesisException, KeyboardInterrupt): raise except Exception: self.failed = True raise # Section: Basic commands. def mkdirp(self, path): if os.path.exists(path): return self.log.append( "$ mkdir -p -- %s" % (pipes.quote(os.path.relpath(path)),)) os.makedirs(path) def cd(self, path): path = os.path.relpath(path) if path == ".": return os.chdir(path) self.log.append("$ cd -- %s" % (pipes.quote(path),)) def hg(self, *args): extra_flags = [] for key, value in self.config.items(): extra_flags.append("--config") extra_flags.append("%s=%s" % (key, value)) self.command("hg", *(tuple(extra_flags) + args)) def command(self, *args): self.log.append("$ " + ' '.join(map(pipes.quote, args))) subprocess.check_output(args, stderr=subprocess.STDOUT) # Section: Set up basic data # This section has no side effects but generates data that we will want # to use later. @rule( target=paths, source=st.lists(files, min_size=1).map(lambda l: os.path.join(*l))) def genpath(self, source): return source @rule( target=committimes, when=datetimes(min_year=1970, max_year=2038) | st.none()) def gentime(self, when): return when @rule( target=contents, content=st.one_of( st.binary(), st.text().map(lambda x: x.encode('utf-8')) )) def gencontent(self, content): return content @rule( target=branches, name=safetext, ) def genbranch(self, name): return name @rule(target=paths, source=paths) def lowerpath(self, source): return source.lower() @rule(target=paths, source=paths) def upperpath(self, source): return source.upper() # Section: Basic path operations @rule(path=paths, content=contents) def writecontent(self, path, content): self.unadded_changes = True if os.path.isdir(path): return parent = os.path.dirname(path) if parent: try: self.mkdirp(parent) except OSError: # It may be the case that there is a regular file that has # previously been created that has the same name as an ancestor # of the current path. This will cause mkdirp to fail with this # error. We just turn this into a no-op in that case. return with open(path, 'wb') as o: o.write(content) self.log.append(( "$ python -c 'import binascii; " "print(binascii.unhexlify(\"%s\"))' > %s") % ( binascii.hexlify(content), pipes.quote(path), )) @rule(path=paths) def addpath(self, path): if os.path.exists(path): self.hg("add", "--", path) @rule(path=paths) def forgetpath(self, path): if os.path.exists(path): with acceptableerrors( "file is already untracked", ): self.hg("forget", "--", path) @rule(s=st.none() | st.integers(0, 100)) def addremove(self, s): args = ["addremove"] if s is not None: args.extend(["-s", str(s)]) self.hg(*args) @rule(path=paths) def removepath(self, path): if os.path.exists(path): with acceptableerrors( 'file is untracked', 'file has been marked for add', 'file is modified', ): self.hg("remove", "--", path) @rule( message=safetext, amend=st.booleans(), when=committimes, addremove=st.booleans(), secret=st.booleans(), close_branch=st.booleans(), ) def maybecommit( self, message, amend, when, addremove, secret, close_branch ): command = ["commit"] errors = ["nothing changed"] if amend: errors.append("cannot amend public changesets") command.append("--amend") command.append("-m" + pipes.quote(message)) if secret: command.append("--secret") if close_branch: command.append("--close-branch") errors.append("can only close branch heads") if addremove: command.append("--addremove") if when is not None: if when.year == 1970: errors.append('negative date value') if when.year == 2038: errors.append('exceeds 32 bits') command.append("--date=%s" % ( when.strftime('%Y-%m-%d %H:%M:%S %z'),)) with acceptableerrors(*errors): self.hg(*command) # Section: Repository management @property def currentrepo(self): return os.path.basename(os.getcwd()) @property def config(self): return self.configperrepo.setdefault(self.currentrepo, {}) @rule( target=repos, source=repos, name=reponames, ) def clone(self, source, name): if not os.path.exists(os.path.join("..", name)): self.cd("..") self.hg("clone", source, name) self.cd(name) return name @rule( target=repos, name=reponames, ) def fresh(self, name): if not os.path.exists(os.path.join("..", name)): self.cd("..") self.mkdirp(name) self.cd(name) self.hg("init") return name @rule(name=repos) def switch(self, name): self.cd(os.path.join("..", name)) assert self.currentrepo == name assert os.path.exists(".hg") @rule(target=repos) def origin(self): return "repo1" @rule() def pull(self, repo=repos): with acceptableerrors( "repository default not found", "repository is unrelated", ): self.hg("pull") @rule(newbranch=st.booleans()) def push(self, newbranch): with acceptableerrors( "default repository not configured", "no changes found", ): if newbranch: self.hg("push", "--new-branch") else: with acceptableerrors( "creates new branches" ): self.hg("push") # Section: Simple side effect free "check" operations @rule() def log(self): self.hg("log") @rule() def verify(self): self.hg("verify") @rule() def diff(self): self.hg("diff", "--nodates") @rule() def status(self): self.hg("status") @rule() def export(self): self.hg("export") # Section: Branch management @rule() def checkbranch(self): self.hg("branch") @rule(branch=branches) def switchbranch(self, branch): with acceptableerrors( 'cannot use an integer as a name', 'cannot be used in a name', 'a branch of the same name already exists', 'is reserved', ): self.hg("branch", "--", branch) @rule(branch=branches, clean=st.booleans()) def update(self, branch, clean): with acceptableerrors( 'unknown revision', 'parse error', ): if clean: self.hg("update", "-C", "--", branch) else: self.hg("update", "--", branch) # Section: Extension management def hasextension(self, extension): return extensionconfigkey(extension) in self.config def commandused(self, extension): assert extension in self.all_extensions self.non_skippable_extensions.add(extension) @rule(extension=extensions) def addextension(self, extension): self.all_extensions.add(extension) self.config[extensionconfigkey(extension)] = "" @rule(extension=extensions) def removeextension(self, extension): self.config.pop(extensionconfigkey(extension), None) # Section: Commands from the shelve extension @rule() @precondition(lambda self: self.hasextension("shelve")) def shelve(self): self.commandused("shelve") with acceptableerrors("nothing changed"): self.hg("shelve") @rule() @precondition(lambda self: self.hasextension("shelve")) def unshelve(self): self.commandused("shelve") with acceptableerrors("no shelved changes to apply"): self.hg("unshelve") class writeonlydatabase(ExampleDatabase): def __init__(self, underlying): super(ExampleDatabase, self).__init__() self.underlying = underlying def fetch(self, key): return () def save(self, key, value): self.underlying.save(key, value) def delete(self, key, value): self.underlying.delete(key, value) def close(self): self.underlying.close() def extensionconfigkey(extension): return "extensions." + extension settings.register_profile( 'default', settings( timeout=300, stateful_step_count=50, max_examples=10, ) ) settings.register_profile( 'fast', settings( timeout=10, stateful_step_count=20, max_examples=5, min_satisfying_examples=1, max_shrinks=0, ) ) settings.register_profile( 'continuous', settings( timeout=-1, stateful_step_count=1000, max_examples=10 ** 8, max_iterations=10 ** 8, database=writeonlydatabase(settings.default.database) ) ) settings.load_profile(os.getenv('HYPOTHESIS_PROFILE', 'default')) verifyingtest = verifyingstatemachine.TestCase verifyingtest.settings = settings.default if __name__ == '__main__': try: silenttestrunner.main(__name__) finally: # So as to prevent proliferation of useless test files, if we never # actually wrote a failing test we clean up after ourselves and delete # the file for doing so that we owned. if os.path.exists(savefile) and os.path.getsize(savefile) == 0: os.unlink(savefile)