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Diffstat (limited to 'third_party/python/taskcluster_taskgraph/taskgraph/run-task/robustcheckout.py')
| -rw-r--r-- | third_party/python/taskcluster_taskgraph/taskgraph/run-task/robustcheckout.py | 826 |
1 files changed, 826 insertions, 0 deletions
diff --git a/third_party/python/taskcluster_taskgraph/taskgraph/run-task/robustcheckout.py b/third_party/python/taskcluster_taskgraph/taskgraph/run-task/robustcheckout.py new file mode 100644 index 0000000000..7e12d07d50 --- /dev/null +++ b/third_party/python/taskcluster_taskgraph/taskgraph/run-task/robustcheckout.py @@ -0,0 +1,826 @@ +# This software may be used and distributed according to the terms of the +# GNU General Public License version 2 or any later version. + +"""Robustly perform a checkout. + +This extension provides the ``hg robustcheckout`` command for +ensuring a working directory is updated to the specified revision +from a source repo using best practices to ensure optimal clone +times and storage efficiency. +""" + +from __future__ import absolute_import + +import contextlib +import json +import os +import random +import re +import socket +import ssl +import time + +from mercurial.i18n import _ +from mercurial.node import hex, nullid +from mercurial import ( + commands, + configitems, + error, + exchange, + extensions, + hg, + match as matchmod, + pycompat, + registrar, + scmutil, + urllibcompat, + util, + vfs, +) + +# Causes worker to purge caches on process exit and for task to retry. +EXIT_PURGE_CACHE = 72 + +testedwith = b"4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9" +minimumhgversion = b"4.5" + +cmdtable = {} +command = registrar.command(cmdtable) + +configtable = {} +configitem = registrar.configitem(configtable) + +configitem(b"robustcheckout", b"retryjittermin", default=configitems.dynamicdefault) +configitem(b"robustcheckout", b"retryjittermax", default=configitems.dynamicdefault) + + +def getsparse(): + from mercurial import sparse + + return sparse + + +def peerlookup(remote, v): + with remote.commandexecutor() as e: + return e.callcommand(b"lookup", {b"key": v}).result() + + +@command( + b"robustcheckout", + [ + (b"", b"upstream", b"", b"URL of upstream repo to clone from"), + (b"r", b"revision", b"", b"Revision to check out"), + (b"b", b"branch", b"", b"Branch to check out"), + (b"", b"purge", False, b"Whether to purge the working directory"), + (b"", b"sharebase", b"", b"Directory where shared repos should be placed"), + ( + b"", + b"networkattempts", + 3, + b"Maximum number of attempts for network " b"operations", + ), + (b"", b"sparseprofile", b"", b"Sparse checkout profile to use (path in repo)"), + ( + b"U", + b"noupdate", + False, + b"the clone will include an empty working directory\n" + b"(only a repository)", + ), + ], + b"[OPTION]... URL DEST", + norepo=True, +) +def robustcheckout( + ui, + url, + dest, + upstream=None, + revision=None, + branch=None, + purge=False, + sharebase=None, + networkattempts=None, + sparseprofile=None, + noupdate=False, +): + """Ensure a working copy has the specified revision checked out. + + Repository data is automatically pooled into the common directory + specified by ``--sharebase``, which is a required argument. It is required + because pooling storage prevents excessive cloning, which makes operations + complete faster. + + One of ``--revision`` or ``--branch`` must be specified. ``--revision`` + is preferred, as it is deterministic and there is no ambiguity as to which + revision will actually be checked out. + + If ``--upstream`` is used, the repo at that URL is used to perform the + initial clone instead of cloning from the repo where the desired revision + is located. + + ``--purge`` controls whether to removed untracked and ignored files from + the working directory. If used, the end state of the working directory + should only contain files explicitly under version control for the requested + revision. + + ``--sparseprofile`` can be used to specify a sparse checkout profile to use. + The sparse checkout profile corresponds to a file in the revision to be + checked out. If a previous sparse profile or config is present, it will be + replaced by this sparse profile. We choose not to "widen" the sparse config + so operations are as deterministic as possible. If an existing checkout + is present and it isn't using a sparse checkout, we error. This is to + prevent accidentally enabling sparse on a repository that may have + clients that aren't sparse aware. Sparse checkout support requires Mercurial + 4.3 or newer and the ``sparse`` extension must be enabled. + """ + if not revision and not branch: + raise error.Abort(b"must specify one of --revision or --branch") + + if revision and branch: + raise error.Abort(b"cannot specify both --revision and --branch") + + # Require revision to look like a SHA-1. + if revision: + if ( + len(revision) < 12 + or len(revision) > 40 + or not re.match(b"^[a-f0-9]+$", revision) + ): + raise error.Abort( + b"--revision must be a SHA-1 fragment 12-40 " b"characters long" + ) + + sharebase = sharebase or ui.config(b"share", b"pool") + if not sharebase: + raise error.Abort( + b"share base directory not defined; refusing to operate", + hint=b"define share.pool config option or pass --sharebase", + ) + + # Sparse profile support was added in Mercurial 4.3, where it was highly + # experimental. Because of the fragility of it, we only support sparse + # profiles on 4.3. When 4.4 is released, we'll need to opt in to sparse + # support. We /could/ silently fall back to non-sparse when not supported. + # However, given that sparse has performance implications, we want to fail + # fast if we can't satisfy the desired checkout request. + if sparseprofile: + try: + extensions.find(b"sparse") + except KeyError: + raise error.Abort( + b"sparse extension must be enabled to use " b"--sparseprofile" + ) + + ui.warn(b"(using Mercurial %s)\n" % util.version()) + + # worker.backgroundclose only makes things faster if running anti-virus, + # which our automation doesn't. Disable it. + ui.setconfig(b"worker", b"backgroundclose", False) + + # By default the progress bar starts after 3s and updates every 0.1s. We + # change this so it shows and updates every 1.0s. + # We also tell progress to assume a TTY is present so updates are printed + # even if there is no known TTY. + # We make the config change here instead of in a config file because + # otherwise we're at the whim of whatever configs are used in automation. + ui.setconfig(b"progress", b"delay", 1.0) + ui.setconfig(b"progress", b"refresh", 1.0) + ui.setconfig(b"progress", b"assume-tty", True) + + sharebase = os.path.realpath(sharebase) + + optimes = [] + behaviors = set() + start = time.time() + + try: + return _docheckout( + ui, + url, + dest, + upstream, + revision, + branch, + purge, + sharebase, + optimes, + behaviors, + networkattempts, + sparse_profile=sparseprofile, + noupdate=noupdate, + ) + finally: + overall = time.time() - start + + # We store the overall time multiple ways in order to help differentiate + # the various "flavors" of operations. + + # ``overall`` is always the total operation time. + optimes.append(("overall", overall)) + + def record_op(name): + # If special behaviors due to "corrupt" storage occur, we vary the + # name to convey that. + if "remove-store" in behaviors: + name += "_rmstore" + if "remove-wdir" in behaviors: + name += "_rmwdir" + + optimes.append((name, overall)) + + # We break out overall operations primarily by their network interaction + # We have variants within for working directory operations. + if "clone" in behaviors and "create-store" in behaviors: + record_op("overall_clone") + + if "sparse-update" in behaviors: + record_op("overall_clone_sparsecheckout") + else: + record_op("overall_clone_fullcheckout") + + elif "pull" in behaviors or "clone" in behaviors: + record_op("overall_pull") + + if "sparse-update" in behaviors: + record_op("overall_pull_sparsecheckout") + else: + record_op("overall_pull_fullcheckout") + + if "empty-wdir" in behaviors: + record_op("overall_pull_emptywdir") + else: + record_op("overall_pull_populatedwdir") + + else: + record_op("overall_nopull") + + if "sparse-update" in behaviors: + record_op("overall_nopull_sparsecheckout") + else: + record_op("overall_nopull_fullcheckout") + + if "empty-wdir" in behaviors: + record_op("overall_nopull_emptywdir") + else: + record_op("overall_nopull_populatedwdir") + + server_url = urllibcompat.urlreq.urlparse(url).netloc + + if "TASKCLUSTER_INSTANCE_TYPE" in os.environ: + perfherder = { + "framework": { + "name": "vcs", + }, + "suites": [], + } + for op, duration in optimes: + perfherder["suites"].append( + { + "name": op, + "value": duration, + "lowerIsBetter": True, + "shouldAlert": False, + "serverUrl": server_url.decode("utf-8"), + "hgVersion": util.version().decode("utf-8"), + "extraOptions": [os.environ["TASKCLUSTER_INSTANCE_TYPE"]], + "subtests": [], + } + ) + ui.write( + b"PERFHERDER_DATA: %s\n" + % pycompat.bytestr(json.dumps(perfherder, sort_keys=True)) + ) + + +def _docheckout( + ui, + url, + dest, + upstream, + revision, + branch, + purge, + sharebase, + optimes, + behaviors, + networkattemptlimit, + networkattempts=None, + sparse_profile=None, + noupdate=False, +): + if not networkattempts: + networkattempts = [1] + + def callself(): + return _docheckout( + ui, + url, + dest, + upstream, + revision, + branch, + purge, + sharebase, + optimes, + behaviors, + networkattemptlimit, + networkattempts=networkattempts, + sparse_profile=sparse_profile, + noupdate=noupdate, + ) + + @contextlib.contextmanager + def timeit(op, behavior): + behaviors.add(behavior) + errored = False + try: + start = time.time() + yield + except Exception: + errored = True + raise + finally: + elapsed = time.time() - start + + if errored: + op += "_errored" + + optimes.append((op, elapsed)) + + ui.write(b"ensuring %s@%s is available at %s\n" % (url, revision or branch, dest)) + + # We assume that we're the only process on the machine touching the + # repository paths that we were told to use. This means our recovery + # scenario when things aren't "right" is to just nuke things and start + # from scratch. This is easier to implement than verifying the state + # of the data and attempting recovery. And in some scenarios (such as + # potential repo corruption), it is probably faster, since verifying + # repos can take a while. + + destvfs = vfs.vfs(dest, audit=False, realpath=True) + + def deletesharedstore(path=None): + storepath = path or destvfs.read(b".hg/sharedpath").strip() + if storepath.endswith(b".hg"): + storepath = os.path.dirname(storepath) + + storevfs = vfs.vfs(storepath, audit=False) + storevfs.rmtree(forcibly=True) + + if destvfs.exists() and not destvfs.exists(b".hg"): + raise error.Abort(b"destination exists but no .hg directory") + + # Refuse to enable sparse checkouts on existing checkouts. The reasoning + # here is that another consumer of this repo may not be sparse aware. If we + # enabled sparse, we would lock them out. + if destvfs.exists() and sparse_profile and not destvfs.exists(b".hg/sparse"): + raise error.Abort( + b"cannot enable sparse profile on existing " b"non-sparse checkout", + hint=b"use a separate working directory to use sparse", + ) + + # And the other direction for symmetry. + if not sparse_profile and destvfs.exists(b".hg/sparse"): + raise error.Abort( + b"cannot use non-sparse checkout on existing sparse " b"checkout", + hint=b"use a separate working directory to use sparse", + ) + + # Require checkouts to be tied to shared storage because efficiency. + if destvfs.exists(b".hg") and not destvfs.exists(b".hg/sharedpath"): + ui.warn(b"(destination is not shared; deleting)\n") + with timeit("remove_unshared_dest", "remove-wdir"): + destvfs.rmtree(forcibly=True) + + # Verify the shared path exists and is using modern pooled storage. + if destvfs.exists(b".hg/sharedpath"): + storepath = destvfs.read(b".hg/sharedpath").strip() + + ui.write(b"(existing repository shared store: %s)\n" % storepath) + + if not os.path.exists(storepath): + ui.warn(b"(shared store does not exist; deleting destination)\n") + with timeit("removed_missing_shared_store", "remove-wdir"): + destvfs.rmtree(forcibly=True) + elif not re.search(b"[a-f0-9]{40}/\.hg$", storepath.replace(b"\\", b"/")): + ui.warn( + b"(shared store does not belong to pooled storage; " + b"deleting destination to improve efficiency)\n" + ) + with timeit("remove_unpooled_store", "remove-wdir"): + destvfs.rmtree(forcibly=True) + + if destvfs.isfileorlink(b".hg/wlock"): + ui.warn( + b"(dest has an active working directory lock; assuming it is " + b"left over from a previous process and that the destination " + b"is corrupt; deleting it just to be sure)\n" + ) + with timeit("remove_locked_wdir", "remove-wdir"): + destvfs.rmtree(forcibly=True) + + def handlerepoerror(e): + if pycompat.bytestr(e) == _(b"abandoned transaction found"): + ui.warn(b"(abandoned transaction found; trying to recover)\n") + repo = hg.repository(ui, dest) + if not repo.recover(): + ui.warn(b"(could not recover repo state; " b"deleting shared store)\n") + with timeit("remove_unrecovered_shared_store", "remove-store"): + deletesharedstore() + + ui.warn(b"(attempting checkout from beginning)\n") + return callself() + + raise + + # At this point we either have an existing working directory using + # shared, pooled storage or we have nothing. + + def handlenetworkfailure(): + if networkattempts[0] >= networkattemptlimit: + raise error.Abort( + b"reached maximum number of network attempts; " b"giving up\n" + ) + + ui.warn( + b"(retrying after network failure on attempt %d of %d)\n" + % (networkattempts[0], networkattemptlimit) + ) + + # Do a backoff on retries to mitigate the thundering herd + # problem. This is an exponential backoff with a multipler + # plus random jitter thrown in for good measure. + # With the default settings, backoffs will be: + # 1) 2.5 - 6.5 + # 2) 5.5 - 9.5 + # 3) 11.5 - 15.5 + backoff = (2 ** networkattempts[0] - 1) * 1.5 + jittermin = ui.configint(b"robustcheckout", b"retryjittermin", 1000) + jittermax = ui.configint(b"robustcheckout", b"retryjittermax", 5000) + backoff += float(random.randint(jittermin, jittermax)) / 1000.0 + ui.warn(b"(waiting %.2fs before retry)\n" % backoff) + time.sleep(backoff) + + networkattempts[0] += 1 + + def handlepullerror(e): + """Handle an exception raised during a pull. + + Returns True if caller should call ``callself()`` to retry. + """ + if isinstance(e, error.Abort): + if e.args[0] == _(b"repository is unrelated"): + ui.warn(b"(repository is unrelated; deleting)\n") + destvfs.rmtree(forcibly=True) + return True + elif e.args[0].startswith(_(b"stream ended unexpectedly")): + ui.warn(b"%s\n" % e.args[0]) + # Will raise if failure limit reached. + handlenetworkfailure() + return True + # TODO test this branch + elif isinstance(e, error.ResponseError): + if e.args[0].startswith(_(b"unexpected response from remote server:")): + ui.warn(b"(unexpected response from remote server; retrying)\n") + destvfs.rmtree(forcibly=True) + # Will raise if failure limit reached. + handlenetworkfailure() + return True + elif isinstance(e, ssl.SSLError): + # Assume all SSL errors are due to the network, as Mercurial + # should convert non-transport errors like cert validation failures + # to error.Abort. + ui.warn(b"ssl error: %s\n" % pycompat.bytestr(str(e))) + handlenetworkfailure() + return True + elif isinstance(e, urllibcompat.urlerr.urlerror): + if isinstance(e.reason, socket.error): + ui.warn(b"socket error: %s\n" % pycompat.bytestr(str(e.reason))) + handlenetworkfailure() + return True + else: + ui.warn( + b"unhandled URLError; reason type: %s; value: %s\n" + % ( + pycompat.bytestr(e.reason.__class__.__name__), + pycompat.bytestr(str(e.reason)), + ) + ) + else: + ui.warn( + b"unhandled exception during network operation; type: %s; " + b"value: %s\n" + % (pycompat.bytestr(e.__class__.__name__), pycompat.bytestr(str(e))) + ) + + return False + + # Perform sanity checking of store. We may or may not know the path to the + # local store. It depends if we have an existing destvfs pointing to a + # share. To ensure we always find a local store, perform the same logic + # that Mercurial's pooled storage does to resolve the local store path. + cloneurl = upstream or url + + try: + clonepeer = hg.peer(ui, {}, cloneurl) + rootnode = peerlookup(clonepeer, b"0") + except error.RepoLookupError: + raise error.Abort(b"unable to resolve root revision from clone " b"source") + except (error.Abort, ssl.SSLError, urllibcompat.urlerr.urlerror) as e: + if handlepullerror(e): + return callself() + raise + + if rootnode == nullid: + raise error.Abort(b"source repo appears to be empty") + + storepath = os.path.join(sharebase, hex(rootnode)) + storevfs = vfs.vfs(storepath, audit=False) + + if storevfs.isfileorlink(b".hg/store/lock"): + ui.warn( + b"(shared store has an active lock; assuming it is left " + b"over from a previous process and that the store is " + b"corrupt; deleting store and destination just to be " + b"sure)\n" + ) + if destvfs.exists(): + with timeit("remove_dest_active_lock", "remove-wdir"): + destvfs.rmtree(forcibly=True) + + with timeit("remove_shared_store_active_lock", "remove-store"): + storevfs.rmtree(forcibly=True) + + if storevfs.exists() and not storevfs.exists(b".hg/requires"): + ui.warn( + b"(shared store missing requires file; this is a really " + b"odd failure; deleting store and destination)\n" + ) + if destvfs.exists(): + with timeit("remove_dest_no_requires", "remove-wdir"): + destvfs.rmtree(forcibly=True) + + with timeit("remove_shared_store_no_requires", "remove-store"): + storevfs.rmtree(forcibly=True) + + if storevfs.exists(b".hg/requires"): + requires = set(storevfs.read(b".hg/requires").splitlines()) + # "share-safe" (enabled by default as of hg 6.1) moved most + # requirements to a new file, so we need to look there as well to avoid + # deleting and re-cloning each time + if b"share-safe" in requires: + requires |= set(storevfs.read(b".hg/store/requires").splitlines()) + # FUTURE when we require generaldelta, this is where we can check + # for that. + required = {b"dotencode", b"fncache"} + + missing = required - requires + if missing: + ui.warn( + b"(shared store missing requirements: %s; deleting " + b"store and destination to ensure optimal behavior)\n" + % b", ".join(sorted(missing)) + ) + if destvfs.exists(): + with timeit("remove_dest_missing_requires", "remove-wdir"): + destvfs.rmtree(forcibly=True) + + with timeit("remove_shared_store_missing_requires", "remove-store"): + storevfs.rmtree(forcibly=True) + + created = False + + if not destvfs.exists(): + # Ensure parent directories of destination exist. + # Mercurial 3.8 removed ensuredirs and made makedirs race safe. + if util.safehasattr(util, "ensuredirs"): + makedirs = util.ensuredirs + else: + makedirs = util.makedirs + + makedirs(os.path.dirname(destvfs.base), notindexed=True) + makedirs(sharebase, notindexed=True) + + if upstream: + ui.write(b"(cloning from upstream repo %s)\n" % upstream) + + if not storevfs.exists(): + behaviors.add(b"create-store") + + try: + with timeit("clone", "clone"): + shareopts = {b"pool": sharebase, b"mode": b"identity"} + res = hg.clone( + ui, + {}, + clonepeer, + dest=dest, + update=False, + shareopts=shareopts, + stream=True, + ) + except (error.Abort, ssl.SSLError, urllibcompat.urlerr.urlerror) as e: + if handlepullerror(e): + return callself() + raise + except error.RepoError as e: + return handlerepoerror(e) + except error.RevlogError as e: + ui.warn(b"(repo corruption: %s; deleting shared store)\n" % e) + with timeit("remove_shared_store_revlogerror", "remote-store"): + deletesharedstore() + return callself() + + # TODO retry here. + if res is None: + raise error.Abort(b"clone failed") + + # Verify it is using shared pool storage. + if not destvfs.exists(b".hg/sharedpath"): + raise error.Abort(b"clone did not create a shared repo") + + created = True + + # The destination .hg directory should exist. Now make sure we have the + # wanted revision. + + repo = hg.repository(ui, dest) + + # We only pull if we are using symbolic names or the requested revision + # doesn't exist. + havewantedrev = False + + if revision: + try: + ctx = scmutil.revsingle(repo, revision) + except error.RepoLookupError: + ctx = None + + if ctx: + if not ctx.hex().startswith(revision): + raise error.Abort( + b"--revision argument is ambiguous", + hint=b"must be the first 12+ characters of a " b"SHA-1 fragment", + ) + + checkoutrevision = ctx.hex() + havewantedrev = True + + if not havewantedrev: + ui.write(b"(pulling to obtain %s)\n" % (revision or branch,)) + + remote = None + try: + remote = hg.peer(repo, {}, url) + pullrevs = [peerlookup(remote, revision or branch)] + checkoutrevision = hex(pullrevs[0]) + if branch: + ui.warn( + b"(remote resolved %s to %s; " + b"result is not deterministic)\n" % (branch, checkoutrevision) + ) + + if checkoutrevision in repo: + ui.warn(b"(revision already present locally; not pulling)\n") + else: + with timeit("pull", "pull"): + pullop = exchange.pull(repo, remote, heads=pullrevs) + if not pullop.rheads: + raise error.Abort(b"unable to pull requested revision") + except (error.Abort, ssl.SSLError, urllibcompat.urlerr.urlerror) as e: + if handlepullerror(e): + return callself() + raise + except error.RepoError as e: + return handlerepoerror(e) + except error.RevlogError as e: + ui.warn(b"(repo corruption: %s; deleting shared store)\n" % e) + deletesharedstore() + return callself() + finally: + if remote: + remote.close() + + # Now we should have the wanted revision in the store. Perform + # working directory manipulation. + + # Avoid any working directory manipulations if `-U`/`--noupdate` was passed + if noupdate: + ui.write(b"(skipping update since `-U` was passed)\n") + return None + + # Purge if requested. We purge before update because this way we're + # guaranteed to not have conflicts on `hg update`. + if purge and not created: + ui.write(b"(purging working directory)\n") + purge = getattr(commands, "purge", None) + if not purge: + purge = extensions.find(b"purge").purge + + # Mercurial 4.3 doesn't purge files outside the sparse checkout. + # See https://bz.mercurial-scm.org/show_bug.cgi?id=5626. Force + # purging by monkeypatching the sparse matcher. + try: + old_sparse_fn = getattr(repo.dirstate, "_sparsematchfn", None) + if old_sparse_fn is not None: + repo.dirstate._sparsematchfn = lambda: matchmod.always() + + with timeit("purge", "purge"): + if purge( + ui, + repo, + all=True, + abort_on_err=True, + # The function expects all arguments to be + # defined. + **{"print": None, "print0": None, "dirs": None, "files": None} + ): + raise error.Abort(b"error purging") + finally: + if old_sparse_fn is not None: + repo.dirstate._sparsematchfn = old_sparse_fn + + # Update the working directory. + + if repo[b"."].node() == nullid: + behaviors.add("empty-wdir") + else: + behaviors.add("populated-wdir") + + if sparse_profile: + sparsemod = getsparse() + + # By default, Mercurial will ignore unknown sparse profiles. This could + # lead to a full checkout. Be more strict. + try: + repo.filectx(sparse_profile, changeid=checkoutrevision).data() + except error.ManifestLookupError: + raise error.Abort( + b"sparse profile %s does not exist at revision " + b"%s" % (sparse_profile, checkoutrevision) + ) + + old_config = sparsemod.parseconfig( + repo.ui, repo.vfs.tryread(b"sparse"), b"sparse" + ) + + old_includes, old_excludes, old_profiles = old_config + + if old_profiles == {sparse_profile} and not old_includes and not old_excludes: + ui.write( + b"(sparse profile %s already set; no need to update " + b"sparse config)\n" % sparse_profile + ) + else: + if old_includes or old_excludes or old_profiles: + ui.write( + b"(replacing existing sparse config with profile " + b"%s)\n" % sparse_profile + ) + else: + ui.write(b"(setting sparse config to profile %s)\n" % sparse_profile) + + # If doing an incremental update, this will perform two updates: + # one to change the sparse profile and another to update to the new + # revision. This is not desired. But there's not a good API in + # Mercurial to do this as one operation. + with repo.wlock(), repo.dirstate.parentchange(), timeit( + "sparse_update_config", "sparse-update-config" + ): + # pylint --py3k: W1636 + fcounts = list( + map( + len, + sparsemod._updateconfigandrefreshwdir( + repo, [], [], [sparse_profile], force=True + ), + ) + ) + + repo.ui.status( + b"%d files added, %d files dropped, " + b"%d files conflicting\n" % tuple(fcounts) + ) + + ui.write(b"(sparse refresh complete)\n") + + op = "update_sparse" if sparse_profile else "update" + behavior = "update-sparse" if sparse_profile else "update" + + with timeit(op, behavior): + if commands.update(ui, repo, rev=checkoutrevision, clean=True): + raise error.Abort(b"error updating") + + ui.write(b"updated to %s\n" % checkoutrevision) + + return None + + +def extsetup(ui): + # Ensure required extensions are loaded. + for ext in (b"purge", b"share"): + try: + extensions.find(ext) + except KeyError: + extensions.load(ui, ext, None) |