Mercurial > hg
view hgext/clonebundles.py @ 50751:0a55206c5a1e
branching: merge stable into default
| author | Raphaël Gomès <rgomes@octobus.net> |
|---|---|
| date | Thu, 06 Jul 2023 16:07:34 +0200 |
| parents | b852c34dc2b8 |
| children | 335aeb3d670b |
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# This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """advertise pre-generated bundles to seed clones "clonebundles" is a server-side extension used to advertise the existence of pre-generated, externally hosted bundle files to clients that are cloning so that cloning can be faster, more reliable, and require less resources on the server. "pullbundles" is a related feature for sending pre-generated bundle files to clients as part of pull operations. Cloning can be a CPU and I/O intensive operation on servers. Traditionally, the server, in response to a client's request to clone, dynamically generates a bundle containing the entire repository content and sends it to the client. There is no caching on the server and the server will have to redundantly generate the same outgoing bundle in response to each clone request. For servers with large repositories or with high clone volume, the load from clones can make scaling the server challenging and costly. This extension provides server operators the ability to offload potentially expensive clone load to an external service. Pre-generated bundles also allow using more CPU intensive compression, reducing the effective bandwidth requirements. Here's how clone bundles work: 1. A server operator establishes a mechanism for making bundle files available on a hosting service where Mercurial clients can fetch them. 2. A manifest file listing available bundle URLs and some optional metadata is added to the Mercurial repository on the server. 3. A client initiates a clone against a clone bundles aware server. 4. The client sees the server is advertising clone bundles and fetches the manifest listing available bundles. 5. The client filters and sorts the available bundles based on what it supports and prefers. 6. The client downloads and applies an available bundle from the server-specified URL. 7. The client reconnects to the original server and performs the equivalent of :hg:`pull` to retrieve all repository data not in the bundle. (The repository could have been updated between when the bundle was created and when the client started the clone.) This may use "pullbundles". Instead of the server generating full repository bundles for every clone request, it generates full bundles once and they are subsequently reused to bootstrap new clones. The server may still transfer data at clone time. However, this is only data that has been added/changed since the bundle was created. For large, established repositories, this can reduce server load for clones to less than 1% of original. Here's how pullbundles work: 1. A manifest file listing available bundles and describing the revisions is added to the Mercurial repository on the server. 2. A new-enough client informs the server that it supports partial pulls and initiates a pull. 3. If the server has pull bundles enabled and sees the client advertising partial pulls, it checks for a matching pull bundle in the manifest. A bundle matches if the format is supported by the client, the client has the required revisions already and needs something from the bundle. 4. If there is at least one matching bundle, the server sends it to the client. 5. The client applies the bundle and notices that the server reply was incomplete. It initiates another pull. To work, this extension requires the following of server operators: * Generating bundle files of repository content (typically periodically, such as once per day). * Clone bundles: A file server that clients have network access to and that Python knows how to talk to through its normal URL handling facility (typically an HTTP/HTTPS server). * A process for keeping the bundles manifest in sync with available bundle files. Strictly speaking, using a static file hosting server isn't required: a server operator could use a dynamic service for retrieving bundle data. However, static file hosting services are simple and scalable and should be sufficient for most needs. Bundle files can be generated with the :hg:`bundle` command. Typically :hg:`bundle --all` is used to produce a bundle of the entire repository. The bundlespec option `stream` (see :hg:`help bundlespec`) can be used to produce a special *streaming clonebundle*, typically using :hg:`bundle --all --type="none-streamv2"`. These are bundle files that are extremely efficient to produce and consume (read: fast). However, they are larger than traditional bundle formats and require that clients support the exact set of repository data store formats in use by the repository that created them. Typically, a newer server can serve data that is compatible with older clients. However, *streaming clone bundles* don't have this guarantee. **Server operators need to be aware that newer versions of Mercurial may produce streaming clone bundles incompatible with older Mercurial versions.** A server operator is responsible for creating a ``.hg/clonebundles.manifest`` file containing the list of available bundle files suitable for seeding clones. If this file does not exist, the repository will not advertise the existence of clone bundles when clients connect. For pull bundles, ``.hg/pullbundles.manifest`` is used. The manifest file contains a newline (\\n) delimited list of entries. Each line in this file defines an available bundle. Lines have the format: <URL> [<key>=<value>[ <key>=<value>]] That is, a URL followed by an optional, space-delimited list of key=value pairs describing additional properties of this bundle. Both keys and values are URI encoded. For pull bundles, the URL is a path under the ``.hg`` directory of the repository. Keys in UPPERCASE are reserved for use by Mercurial and are defined below. All non-uppercase keys can be used by site installations. An example use for custom properties is to use the *datacenter* attribute to define which data center a file is hosted in. Clients could then prefer a server in the data center closest to them. The following reserved keys are currently defined: BUNDLESPEC A "bundle specification" string that describes the type of the bundle. These are string values that are accepted by the "--type" argument of :hg:`bundle`. The values are parsed in strict mode, which means they must be of the "<compression>-<type>" form. See mercurial.exchange.parsebundlespec() for more details. :hg:`debugbundle --spec` can be used to print the bundle specification string for a bundle file. The output of this command can be used verbatim for the value of ``BUNDLESPEC`` (it is already escaped). Clients will automatically filter out specifications that are unknown or unsupported so they won't attempt to download something that likely won't apply. The actual value doesn't impact client behavior beyond filtering: clients will still sniff the bundle type from the header of downloaded files. **Use of this key is highly recommended**, as it allows clients to easily skip unsupported bundles. If this key is not defined, an old client may attempt to apply a bundle that it is incapable of reading. REQUIRESNI Whether Server Name Indication (SNI) is required to connect to the URL. SNI allows servers to use multiple certificates on the same IP. It is somewhat common in CDNs and other hosting providers. Older Python versions do not support SNI. Defining this attribute enables clients with older Python versions to filter this entry without experiencing an opaque SSL failure at connection time. If this is defined, it is important to advertise a non-SNI fallback URL or clients running old Python releases may not be able to clone with the clonebundles facility. Value should be "true". REQUIREDRAM Value specifies expected memory requirements to decode the payload. Values can have suffixes for common bytes sizes. e.g. "64MB". This key is often used with zstd-compressed bundles using a high compression level / window size, which can require 100+ MB of memory to decode. heads Used for pull bundles. This contains the ``;`` separated changeset hashes of the heads of the bundle content. bases Used for pull bundles. This contains the ``;`` separated changeset hashes of the roots of the bundle content. This can be skipped if the bundle was created without ``--base``. Manifests can contain multiple entries. Assuming metadata is defined, clients will filter entries from the manifest that they don't support. The remaining entries are optionally sorted by client preferences (``ui.clonebundleprefers`` config option). The client then attempts to fetch the bundle at the first URL in the remaining list. **Errors when downloading a bundle will fail the entire clone operation: clients do not automatically fall back to a traditional clone.** The reason for this is that if a server is using clone bundles, it is probably doing so because the feature is necessary to help it scale. In other words, there is an assumption that clone load will be offloaded to another service and that the Mercurial server isn't responsible for serving this clone load. If that other service experiences issues and clients start mass falling back to the original Mercurial server, the added clone load could overwhelm the server due to unexpected load and effectively take it offline. Not having clients automatically fall back to cloning from the original server mitigates this scenario. Because there is no automatic Mercurial server fallback on failure of the bundle hosting service, it is important for server operators to view the bundle hosting service as an extension of the Mercurial server in terms of availability and service level agreements: if the bundle hosting service goes down, so does the ability for clients to clone. Note: clients will see a message informing them how to bypass the clone bundles facility when a failure occurs. So server operators should prepare for some people to follow these instructions when a failure occurs, thus driving more load to the original Mercurial server when the bundle hosting service fails. inline clonebundles ------------------- It is possible to transmit clonebundles inline in case repositories are accessed over SSH. This avoids having to setup an external HTTPS server and results in the same access control as already present for the SSH setup. Inline clonebundles should be placed into the `.hg/bundle-cache` directory. A clonebundle at `.hg/bundle-cache/mybundle.bundle` is referred to in the `clonebundles.manifest` file as `peer-bundle-cache://mybundle.bundle`. auto-generation of clone bundles -------------------------------- It is possible to set Mercurial to automatically re-generate clone bundles when enough new content is available. Mercurial will take care of the process asynchronously. The defined list of bundle-type will be generated, uploaded, and advertised. Older bundles will get decommissioned as newer ones replace them. Bundles Generation: ................... The extension can generate multiple variants of the clone bundle. Each different variant will be defined by the "bundle-spec" they use:: [clone-bundles] auto-generate.formats= zstd-v2, gzip-v2 See `hg help bundlespec` for details about available options. By default, new bundles are generated when 5% of the repository contents or at least 1000 revisions are not contained in the cached bundles. This option can be controlled by the `clone-bundles.trigger.below-bundled-ratio` option (default 0.95) and the `clone-bundles.trigger.revs` option (default 1000):: [clone-bundles] trigger.below-bundled-ratio=0.95 trigger.revs=1000 This logic can be manually triggered using the `admin::clone-bundles-refresh` command, or automatically on each repository change if `clone-bundles.auto-generate.on-change` is set to `yes`:: [clone-bundles] auto-generate.on-change=yes auto-generate.formats= zstd-v2, gzip-v2 Automatic Inline serving ........................ The simplest way to serve the generated bundle is through the Mercurial protocol. However it is not the most efficient as request will still be served by that main server. It is useful in case where authentication is complexe or when an efficient mirror system is already in use anyway. See the `inline clonebundles` section above for details about inline clonebundles To automatically serve generated bundle through inline clonebundle, simply set the following option:: auto-generate.serve-inline=yes Enabling this option disable the managed upload and serving explained below. Bundles Upload and Serving: ........................... This is the most efficient way to serve automatically generated clone bundles, but requires some setup. The generated bundles need to be made available to users through a "public" URL. This should be donne through `clone-bundles.upload-command` configuration. The value of this command should be a shell command. It will have access to the bundle file path through the `$HGCB_BUNDLE_PATH` variable. And the expected basename in the "public" URL is accessible at:: [clone-bundles] upload-command=sftp put $HGCB_BUNDLE_PATH \ sftp://bundles.host/clone-bundles/$HGCB_BUNDLE_BASENAME If the file was already uploaded, the command must still succeed. After upload, the file should be available at an url defined by `clone-bundles.url-template`. [clone-bundles] url-template=https://bundles.host/cache/clone-bundles/{basename} Old bundles cleanup: .................... When new bundles are generated, the older ones are no longer necessary and can be removed from storage. This is done through the `clone-bundles.delete-command` configuration. The command is given the url of the artifact to delete through the `$HGCB_BUNDLE_URL` environment variable. [clone-bundles] delete-command=sftp rm sftp://bundles.host/clone-bundles/$HGCB_BUNDLE_BASENAME If the file was already deleted, the command must still succeed. """ import os import weakref from mercurial.i18n import _ from mercurial import ( bundlecaches, commands, error, extensions, localrepo, lock, node, registrar, util, wireprotov1server, ) from mercurial.utils import ( procutil, ) testedwith = b'ships-with-hg-core' def capabilities(orig, repo, proto): caps = orig(repo, proto) # Only advertise if a manifest exists. This does add some I/O to requests. # But this should be cheaper than a wasted network round trip due to # missing file. if repo.vfs.exists(bundlecaches.CB_MANIFEST_FILE): caps.append(b'clonebundles') caps.append(b'clonebundles_manifest') return caps def extsetup(ui): extensions.wrapfunction(wireprotov1server, b'_capabilities', capabilities) # logic for bundle auto-generation configtable = {} configitem = registrar.configitem(configtable) cmdtable = {} command = registrar.command(cmdtable) configitem(b'clone-bundles', b'auto-generate.on-change', default=False) configitem(b'clone-bundles', b'auto-generate.formats', default=list) configitem(b'clone-bundles', b'auto-generate.serve-inline', default=False) configitem(b'clone-bundles', b'trigger.below-bundled-ratio', default=0.95) configitem(b'clone-bundles', b'trigger.revs', default=1000) configitem(b'clone-bundles', b'upload-command', default=None) configitem(b'clone-bundles', b'delete-command', default=None) configitem(b'clone-bundles', b'url-template', default=None) configitem(b'devel', b'debug.clonebundles', default=False) # category for the post-close transaction hooks CAT_POSTCLOSE = b"clonebundles-autobundles" # template for bundle file names BUNDLE_MASK = ( b"full-%(bundle_type)s-%(revs)d_revs-%(tip_short)s_tip-%(op_id)s.hg" ) # file in .hg/ use to track clonebundles being auto-generated AUTO_GEN_FILE = b'clonebundles.auto-gen' class BundleBase(object): """represents the core of properties that matters for us in a bundle :bundle_type: the bundlespec (see hg help bundlespec) :revs: the number of revisions in the repo at bundle creation time :tip_rev: the rev-num of the tip revision :tip_node: the node id of the tip-most revision in the bundle :ready: True if the bundle is ready to be served """ ready = False def __init__(self, bundle_type, revs, tip_rev, tip_node): self.bundle_type = bundle_type self.revs = revs self.tip_rev = tip_rev self.tip_node = tip_node def valid_for(self, repo): """is this bundle applicable to the current repository This is useful for detecting bundles made irrelevant by stripping. """ tip_node = node.bin(self.tip_node) return repo.changelog.index.get_rev(tip_node) == self.tip_rev def __eq__(self, other): left = (self.ready, self.bundle_type, self.tip_rev, self.tip_node) right = (other.ready, other.bundle_type, other.tip_rev, other.tip_node) return left == right def __neq__(self, other): return not self == other def __cmp__(self, other): if self == other: return 0 return -1 class RequestedBundle(BundleBase): """A bundle that should be generated. Additional attributes compared to BundleBase :heads: list of head revisions (as rev-num) :op_id: a "unique" identifier for the operation triggering the change """ def __init__(self, bundle_type, revs, tip_rev, tip_node, head_revs, op_id): self.head_revs = head_revs self.op_id = op_id super(RequestedBundle, self).__init__( bundle_type, revs, tip_rev, tip_node, ) @property def suggested_filename(self): """A filename that can be used for the generated bundle""" data = { b'bundle_type': self.bundle_type, b'revs': self.revs, b'heads': self.head_revs, b'tip_rev': self.tip_rev, b'tip_node': self.tip_node, b'tip_short': self.tip_node[:12], b'op_id': self.op_id, } return BUNDLE_MASK % data def generate_bundle(self, repo, file_path): """generate the bundle at `filepath`""" commands.bundle( repo.ui, repo, file_path, base=[b"null"], rev=self.head_revs, type=self.bundle_type, quiet=True, ) def generating(self, file_path, hostname=None, pid=None): """return a GeneratingBundle object from this object""" if pid is None: pid = os.getpid() if hostname is None: hostname = lock._getlockprefix() return GeneratingBundle( self.bundle_type, self.revs, self.tip_rev, self.tip_node, hostname, pid, file_path, ) class GeneratingBundle(BundleBase): """A bundle being generated extra attributes compared to BundleBase: :hostname: the hostname of the machine generating the bundle :pid: the pid of the process generating the bundle :filepath: the target filename of the bundle These attributes exist to help detect stalled generation processes. """ ready = False def __init__( self, bundle_type, revs, tip_rev, tip_node, hostname, pid, filepath ): self.hostname = hostname self.pid = pid self.filepath = filepath super(GeneratingBundle, self).__init__( bundle_type, revs, tip_rev, tip_node ) @classmethod def from_line(cls, line): """create an object by deserializing a line from AUTO_GEN_FILE""" assert line.startswith(b'PENDING-v1 ') ( __, bundle_type, revs, tip_rev, tip_node, hostname, pid, filepath, ) = line.split() hostname = util.urlreq.unquote(hostname) filepath = util.urlreq.unquote(filepath) revs = int(revs) tip_rev = int(tip_rev) pid = int(pid) return cls( bundle_type, revs, tip_rev, tip_node, hostname, pid, filepath ) def to_line(self): """serialize the object to include as a line in AUTO_GEN_FILE""" templ = b"PENDING-v1 %s %d %d %s %s %d %s" data = ( self.bundle_type, self.revs, self.tip_rev, self.tip_node, util.urlreq.quote(self.hostname), self.pid, util.urlreq.quote(self.filepath), ) return templ % data def __eq__(self, other): if not super(GeneratingBundle, self).__eq__(other): return False left = (self.hostname, self.pid, self.filepath) right = (other.hostname, other.pid, other.filepath) return left == right def uploaded(self, url, basename): """return a GeneratedBundle from this object""" return GeneratedBundle( self.bundle_type, self.revs, self.tip_rev, self.tip_node, url, basename, ) class GeneratedBundle(BundleBase): """A bundle that is done being generated and can be served extra attributes compared to BundleBase: :file_url: the url where the bundle is available. :basename: the "basename" used to upload (useful for deletion) These attributes exist to generate a bundle manifest (.hg/pullbundles.manifest) """ ready = True def __init__( self, bundle_type, revs, tip_rev, tip_node, file_url, basename ): self.file_url = file_url self.basename = basename super(GeneratedBundle, self).__init__( bundle_type, revs, tip_rev, tip_node ) @classmethod def from_line(cls, line): """create an object by deserializing a line from AUTO_GEN_FILE""" assert line.startswith(b'DONE-v1 ') ( __, bundle_type, revs, tip_rev, tip_node, file_url, basename, ) = line.split() revs = int(revs) tip_rev = int(tip_rev) file_url = util.urlreq.unquote(file_url) return cls(bundle_type, revs, tip_rev, tip_node, file_url, basename) def to_line(self): """serialize the object to include as a line in AUTO_GEN_FILE""" templ = b"DONE-v1 %s %d %d %s %s %s" data = ( self.bundle_type, self.revs, self.tip_rev, self.tip_node, util.urlreq.quote(self.file_url), self.basename, ) return templ % data def manifest_line(self): """serialize the object to include as a line in pullbundles.manifest""" templ = b"%s BUNDLESPEC=%s" if self.file_url.startswith(b'http'): templ += b" REQUIRESNI=true" return templ % (self.file_url, self.bundle_type) def __eq__(self, other): if not super(GeneratedBundle, self).__eq__(other): return False return self.file_url == other.file_url def parse_auto_gen(content): """parse the AUTO_GEN_FILE to return a list of Bundle object""" bundles = [] for line in content.splitlines(): if line.startswith(b'PENDING-v1 '): bundles.append(GeneratingBundle.from_line(line)) elif line.startswith(b'DONE-v1 '): bundles.append(GeneratedBundle.from_line(line)) return bundles def dumps_auto_gen(bundles): """serialize a list of Bundle as a AUTO_GEN_FILE content""" lines = [] for b in bundles: lines.append(b"%s\n" % b.to_line()) lines.sort() return b"".join(lines) def read_auto_gen(repo): """read the AUTO_GEN_FILE for the <repo> a list of Bundle object""" data = repo.vfs.tryread(AUTO_GEN_FILE) if not data: return [] return parse_auto_gen(data) def write_auto_gen(repo, bundles): """write a list of Bundle objects into the repo's AUTO_GEN_FILE""" assert repo._cb_lock_ref is not None data = dumps_auto_gen(bundles) with repo.vfs(AUTO_GEN_FILE, mode=b'wb', atomictemp=True) as f: f.write(data) def generate_manifest(bundles): """write a list of Bundle objects into the repo's AUTO_GEN_FILE""" bundles = list(bundles) bundles.sort(key=lambda b: b.bundle_type) lines = [] for b in bundles: lines.append(b"%s\n" % b.manifest_line()) return b"".join(lines) def update_ondisk_manifest(repo): """update the clonebundle manifest with latest url""" with repo.clonebundles_lock(): bundles = read_auto_gen(repo) per_types = {} for b in bundles: if not (b.ready and b.valid_for(repo)): continue current = per_types.get(b.bundle_type) if current is not None and current.revs >= b.revs: continue per_types[b.bundle_type] = b manifest = generate_manifest(per_types.values()) with repo.vfs( bundlecaches.CB_MANIFEST_FILE, mode=b"wb", atomictemp=True ) as f: f.write(manifest) def update_bundle_list(repo, new_bundles=(), del_bundles=()): """modify the repo's AUTO_GEN_FILE This method also regenerates the clone bundle manifest when needed""" with repo.clonebundles_lock(): bundles = read_auto_gen(repo) if del_bundles: bundles = [b for b in bundles if b not in del_bundles] new_bundles = [b for b in new_bundles if b not in bundles] bundles.extend(new_bundles) write_auto_gen(repo, bundles) all_changed = [] all_changed.extend(new_bundles) all_changed.extend(del_bundles) if any(b.ready for b in all_changed): update_ondisk_manifest(repo) def cleanup_tmp_bundle(repo, target): """remove a GeneratingBundle file and entry""" assert not target.ready with repo.clonebundles_lock(): repo.vfs.tryunlink(target.filepath) update_bundle_list(repo, del_bundles=[target]) def finalize_one_bundle(repo, target): """upload a generated bundle and advertise it in the clonebundles.manifest""" with repo.clonebundles_lock(): bundles = read_auto_gen(repo) if target in bundles and target.valid_for(repo): result = upload_bundle(repo, target) update_bundle_list(repo, new_bundles=[result]) cleanup_tmp_bundle(repo, target) def find_outdated_bundles(repo, bundles): """finds outdated bundles""" olds = [] per_types = {} for b in bundles: if not b.valid_for(repo): olds.append(b) continue l = per_types.setdefault(b.bundle_type, []) l.append(b) for key in sorted(per_types): all = per_types[key] if len(all) > 1: all.sort(key=lambda b: b.revs, reverse=True) olds.extend(all[1:]) return olds def collect_garbage(repo): """finds outdated bundles and get them deleted""" with repo.clonebundles_lock(): bundles = read_auto_gen(repo) olds = find_outdated_bundles(repo, bundles) for o in olds: delete_bundle(repo, o) update_bundle_list(repo, del_bundles=olds) def upload_bundle(repo, bundle): """upload the result of a GeneratingBundle and return a GeneratedBundle The upload is done using the `clone-bundles.upload-command` """ inline = repo.ui.config(b'clone-bundles', b'auto-generate.serve-inline') basename = repo.vfs.basename(bundle.filepath) if inline: dest_dir = repo.vfs.join(bundlecaches.BUNDLE_CACHE_DIR) repo.vfs.makedirs(dest_dir) dest = repo.vfs.join(dest_dir, basename) util.copyfiles(bundle.filepath, dest, hardlink=True) url = bundlecaches.CLONEBUNDLESCHEME + basename return bundle.uploaded(url, basename) else: cmd = repo.ui.config(b'clone-bundles', b'upload-command') url = repo.ui.config(b'clone-bundles', b'url-template') filepath = procutil.shellquote(bundle.filepath) variables = { b'HGCB_BUNDLE_PATH': filepath, b'HGCB_BUNDLE_BASENAME': basename, } env = procutil.shellenviron(environ=variables) ret = repo.ui.system(cmd, environ=env) if ret: raise error.Abort(b"command returned status %d: %s" % (ret, cmd)) url = ( url.decode('utf8') .format(basename=basename.decode('utf8')) .encode('utf8') ) return bundle.uploaded(url, basename) def delete_bundle(repo, bundle): """delete a bundle from storage""" assert bundle.ready inline = bundle.file_url.startswith(bundlecaches.CLONEBUNDLESCHEME) if inline: msg = b'clone-bundles: deleting inline bundle %s\n' else: msg = b'clone-bundles: deleting bundle %s\n' msg %= bundle.basename if repo.ui.configbool(b'devel', b'debug.clonebundles'): repo.ui.write(msg) else: repo.ui.debug(msg) if inline: inline_path = repo.vfs.join( bundlecaches.BUNDLE_CACHE_DIR, bundle.basename, ) util.tryunlink(inline_path) else: cmd = repo.ui.config(b'clone-bundles', b'delete-command') variables = { b'HGCB_BUNDLE_URL': bundle.file_url, b'HGCB_BASENAME': bundle.basename, } env = procutil.shellenviron(environ=variables) ret = repo.ui.system(cmd, environ=env) if ret: raise error.Abort(b"command returned status %d: %s" % (ret, cmd)) def auto_bundle_needed_actions(repo, bundles, op_id): """find the list of bundles that need action returns a list of RequestedBundle objects that need to be generated and uploaded.""" create_bundles = [] delete_bundles = [] repo = repo.filtered(b"immutable") targets = repo.ui.configlist(b'clone-bundles', b'auto-generate.formats') ratio = float( repo.ui.config(b'clone-bundles', b'trigger.below-bundled-ratio') ) abs_revs = repo.ui.configint(b'clone-bundles', b'trigger.revs') revs = len(repo.changelog) generic_data = { 'revs': revs, 'head_revs': repo.changelog.headrevs(), 'tip_rev': repo.changelog.tiprev(), 'tip_node': node.hex(repo.changelog.tip()), 'op_id': op_id, } for t in targets: t = bundlecaches.parsebundlespec(repo, t, strict=False).as_spec() if new_bundle_needed(repo, bundles, ratio, abs_revs, t, revs): data = generic_data.copy() data['bundle_type'] = t b = RequestedBundle(**data) create_bundles.append(b) delete_bundles.extend(find_outdated_bundles(repo, bundles)) return create_bundles, delete_bundles def new_bundle_needed(repo, bundles, ratio, abs_revs, bundle_type, revs): """consider the current cached content and trigger new bundles if needed""" threshold = max((revs * ratio), (revs - abs_revs)) for b in bundles: if not b.valid_for(repo) or b.bundle_type != bundle_type: continue if b.revs > threshold: return False return True def start_one_bundle(repo, bundle): """start the generation of a single bundle file the `bundle` argument should be a RequestedBundle object. This data is passed to the `debugmakeclonebundles` "as is". """ data = util.pickle.dumps(bundle) cmd = [procutil.hgexecutable(), b'--cwd', repo.path, INTERNAL_CMD] env = procutil.shellenviron() msg = b'clone-bundles: starting bundle generation: %s\n' stdout = None stderr = None waits = [] record_wait = None if repo.ui.configbool(b'devel', b'debug.clonebundles'): stdout = procutil.stdout stderr = procutil.stderr repo.ui.write(msg % bundle.bundle_type) record_wait = waits.append else: repo.ui.debug(msg % bundle.bundle_type) bg = procutil.runbgcommand bg( cmd, env, stdin_bytes=data, stdout=stdout, stderr=stderr, record_wait=record_wait, ) for f in waits: f() INTERNAL_CMD = b'debug::internal-make-clone-bundles' @command(INTERNAL_CMD, [], b'') def debugmakeclonebundles(ui, repo): """Internal command to auto-generate debug bundles""" requested_bundle = util.pickle.load(procutil.stdin) procutil.stdin.close() collect_garbage(repo) fname = requested_bundle.suggested_filename fpath = repo.vfs.makedirs(b'tmp-bundles') fpath = repo.vfs.join(b'tmp-bundles', fname) bundle = requested_bundle.generating(fpath) update_bundle_list(repo, new_bundles=[bundle]) requested_bundle.generate_bundle(repo, fpath) repo.invalidate() finalize_one_bundle(repo, bundle) def make_auto_bundler(source_repo): reporef = weakref.ref(source_repo) def autobundle(tr): repo = reporef() assert repo is not None bundles = read_auto_gen(repo) new, __ = auto_bundle_needed_actions(repo, bundles, b"%d_txn" % id(tr)) for data in new: start_one_bundle(repo, data) return None return autobundle def reposetup(ui, repo): """install the two pieces needed for automatic clonebundle generation - add a "post-close" hook that fires bundling when needed - introduce a clone-bundle lock to let multiple processes meddle with the state files. """ if not repo.local(): return class autobundlesrepo(repo.__class__): def transaction(self, *args, **kwargs): tr = super(autobundlesrepo, self).transaction(*args, **kwargs) enabled = repo.ui.configbool( b'clone-bundles', b'auto-generate.on-change', ) targets = repo.ui.configlist( b'clone-bundles', b'auto-generate.formats' ) if enabled: if not targets: repo.ui.warn( _( b'clone-bundle auto-generate enabled, ' b'but no formats specified: disabling generation\n' ) ) else: tr.addpostclose(CAT_POSTCLOSE, make_auto_bundler(self)) return tr @localrepo.unfilteredmethod def clonebundles_lock(self, wait=True): '''Lock the repository file related to clone bundles''' if not util.safehasattr(self, '_cb_lock_ref'): self._cb_lock_ref = None l = self._currentlock(self._cb_lock_ref) if l is not None: l.lock() return l l = self._lock( vfs=self.vfs, lockname=b"clonebundleslock", wait=wait, releasefn=None, acquirefn=None, desc=_(b'repository %s') % self.origroot, ) self._cb_lock_ref = weakref.ref(l) return l repo._wlockfreeprefix.add(AUTO_GEN_FILE) repo._wlockfreeprefix.add(bundlecaches.CB_MANIFEST_FILE) repo.__class__ = autobundlesrepo @command( b'admin::clone-bundles-refresh', [ ( b'', b'background', False, _(b'start bundle generation in the background'), ), ], b'', ) def cmd_admin_clone_bundles_refresh( ui, repo: localrepo.localrepository, background=False, ): """generate clone bundles according to the configuration This runs the logic for automatic generation, removing outdated bundles and generating new ones if necessary. See :hg:`help -e clone-bundles` for details about how to configure this feature. """ debug = repo.ui.configbool(b'devel', b'debug.clonebundles') bundles = read_auto_gen(repo) op_id = b"%d_acbr" % os.getpid() create, delete = auto_bundle_needed_actions(repo, bundles, op_id) # if some bundles are scheduled for creation in the background, they will # deal with garbage collection too, so no need to synchroniously do it. # # However if no bundles are scheduled for creation, we need to explicitly do # it here. if not (background and create): # we clean up outdated bundles before generating new ones to keep the # last two versions of the bundle around for a while and avoid having to # deal with clients that just got served a manifest. for o in delete: delete_bundle(repo, o) update_bundle_list(repo, del_bundles=delete) if create: fpath = repo.vfs.makedirs(b'tmp-bundles') if background: for requested_bundle in create: start_one_bundle(repo, requested_bundle) else: for requested_bundle in create: if debug: msg = b'clone-bundles: starting bundle generation: %s\n' repo.ui.write(msg % requested_bundle.bundle_type) fname = requested_bundle.suggested_filename fpath = repo.vfs.join(b'tmp-bundles', fname) generating_bundle = requested_bundle.generating(fpath) update_bundle_list(repo, new_bundles=[generating_bundle]) requested_bundle.generate_bundle(repo, fpath) result = upload_bundle(repo, generating_bundle) update_bundle_list(repo, new_bundles=[result]) update_ondisk_manifest(repo) cleanup_tmp_bundle(repo, generating_bundle) @command(b'admin::clone-bundles-clear', [], b'') def cmd_admin_clone_bundles_clear(ui, repo: localrepo.localrepository): """remove existing clone bundle caches See `hg help admin::clone-bundles-refresh` for details on how to regenerate them. This command will only affect bundles currently available, it will not affect bundles being asynchronously generated. """ bundles = read_auto_gen(repo) delete = [b for b in bundles if b.ready] for o in delete: delete_bundle(repo, o) update_bundle_list(repo, del_bundles=delete)