revlog: have an explicit "pack_header" method Having to pass the version header when retrieving the binary version of every single entry is a bit silly. So we extract that special logic in its own method. This also prepare the move to newer revlog format, not storing the header within an actual entry… Differential Revision: https://phab.mercurial-scm.org/D10510

revlog: remove the revlogio class The class only contains a single `parseindex` method. Lets just make it a function and remove the `revlogio` class. It served us well but became thinner and thinner overtime. Differential Revision: https://phab.mercurial-scm.org/D10509

revlog: fix some comment style They displease check-code. Differential Revision: https://phab.mercurial-scm.org/D10542

revlog: add a `entry_binary` method on index The revlog index is already responsible for unpacking the binary entry, it would be simpler to make it responsible for packing them. In practice the C version of the index is already doing this internally. We introduce a "entry_binary" method that return the binary version of an existing revision. The method currently need to also take the revlog header to deal with the "first revision" special case. We will introduce further refactor in a later changeset to split that logic out. Differential Revision: https://phab.mercurial-scm.org/D10508

template: make an explicit closure for formatting entry in peerurls This is about to be become significantly more complicated as `ui.path[x]` will become a list. Differential Revision: https://phab.mercurial-scm.org/D10443

template: use `list_paths` in `peerurls` Using common code will make it simpler to update the logic behind the path definition and storage. Differential Revision: https://phab.mercurial-scm.org/D10442

paths: use `list_paths` in `hg paths` Using common code will make it simpler to update the logic behind the path definition and storage. Differential Revision: https://phab.mercurial-scm.org/D10441

urlutil: introduce a new `list_paths` function This function will be useful for command and template that wants to display path related information. Differential Revision: https://phab.mercurial-scm.org/D10440

urlutil: deprecate `getpath` There as no remaining user of that function. Differential Revision: https://phab.mercurial-scm.org/D10439

urlutil: inline the relevant part of `getpath` in `get_push_paths` The part that `get_push_paths` needs is quite simple, inclining will help us to deprecated `getpath`. Differential Revision: https://phab.mercurial-scm.org/D10438

url_util: introduce a `try_path` function That function… try a build a path, returning None on failure. This helps us to simplify various part of the existing code. Differential Revision: https://phab.mercurial-scm.org/D10437

narrow: add more status messages when narrowing Each of the steps I added status messages for in this patch frequently take minutes or tens of minutes for our internal users. It would be nice to also have a progress bar but that will have to come later. Differential Revision: https://phab.mercurial-scm.org/D10503

narrow: add progress-reporting when looking for local changes in `hg tracked` Looking for local changes (changes not on the given remote) can take a long time, so we should have progress-reporting for it. Differential Revision: https://phab.mercurial-scm.org/D10501

chg: pass --no-profile to disable profiling when starting hg serve If profiling is enabled via global/user config (as far as I can tell, this doesn't affect use of the --profile flag, but it probably does affect --config profiling.enabled=1), then the profiling data can be *cumulative* for the lifetime of the chg process. This leads to some "interesting" results where hg claims the walltime is something like 200s on a command that took only a second or two to run. Worse, however, is that with at least some profilers (such as the default "stat" profiler), this can cause a large slowdown while generating the profiler output. Differential Revision: https://phab.mercurial-scm.org/D10470

profiling: add --no-profile to disable profiling enabled via config Differential Revision: https://phab.mercurial-scm.org/D10469

tests: fix test-chg to ignore a warning about being unable to set locale This is apparently coming from bash when bash is providing the sh that we're using to execute the .sh file generated by run-tests for this test. Bash on my machine: ``` $ sh --version GNU bash, version 5.1.4(1)-release (x86_64-pc-linux-gnu) Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software; you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. $ sh sh-5.1$ LC_CTYPE=unsupported_value echo hi sh: warning: setlocale: LC_CTYPE: cannot change locale (unsupported_value): No such file or directory hi ``` Differential Revision: https://phab.mercurial-scm.org/D10468

branch: delete obsolete message about changing branch of obsolete commit We now rely on `rewriteutil.precheck()` to check for divergence, so we don't need the extra check in `cmdutil.changebranch()`. The former check is a little less strict in that it allows you to rewrite a commit without non-obsolete successors. Differential Revision: https://phab.mercurial-scm.org/D10519

rewriteutil: check for divergence This code is adapted from the code in the evolve extension. It seems to be equivalent as far as the evolve extension's test suite can tell (the only impact when making their `precheck()` delegate to our version is that error messages are less detailed). I had to change the error message to work with "change branch of" being inserted as the action. Differential Revision: https://phab.mercurial-scm.org/D10518

rewriteutil: adapt "cannot %s while merging" to work with "change branch of" `rewriteutil.precheck()` creates error messages by inserting a given verb into a sentence. The `hg branch -r` command passes in "change branch of" as the verb. That doesn't work well with "cannot %s while merging" (making it "cannot change branch of while merging"). Let's insert a "changeset" there to make it work better. Building sentences like this seems obviously bad for i18n, but fixing that is out of scope for this series, IMO. Differential Revision: https://phab.mercurial-scm.org/D10530

rewriteutil: point to help about instability when rewriting creates orphan This replicates the message from the evolve extension. Differential Revision: https://phab.mercurial-scm.org/D10517

help: add topic about evolution, based on text from evolve extension I've taken the text produced by `hg help evolution` when the evolve extension is enabled and made that available by the same command with just hg core. Changes I've made: * Added "(EXPERIMENTAL)" to the title. (That doesn't hide the topic from `hg help`, though.) * Replaced old-style `experimental.evolution=<names>` config by new-style `experimental.evolution.<name>=true`. * Replaces a "obsolete markers" by "obsolescence markers". * Removed most content from "Current feature status". When the evolve extension is enabled, its help text takes precedence. Differential Revision: https://phab.mercurial-scm.org/D10516

rewriteutil: add devel warning if precheck is called with contexts I'm trying to upstream parts from the evolve extension. This check exists there. Differential Revision: https://phab.mercurial-scm.org/D10515

rewriteutil: replace "null changeset" by "the null revision" in error message The evolve extension uses "the null revision" and we seem to use that term much more frequently in core too. Differential Revision: https://phab.mercurial-scm.org/D10514

relnotes: copy contents of "next" to "5.8" and clear "next" The same procedure as every year^Wcycle. Unlike previous cycles, I haven't actually recorded the copy because we don't want to propagate further changes in "next" (from the stable branch) to "5.8". Differential Revision: https://phab.mercurial-scm.org/D10500

dirstateguard: use mktemp-like functionality to generate the backup filenames Previously these were generated with names like: `dirstate.backup.commit.<memory address of dirstateguard>` This could cause problems if two hg commands ran at the same time that used the same memory address, (which is apparently not uncommon if chg is involved), as memory addresses are not unique across processes. This issue was reported in the post-review comments on http://phab.mercurial-scm.org/D9952. Differential Revision: https://phab.mercurial-scm.org/D10504

node: replace nullid and friends with nodeconstants class The introduction of 256bit hashes require changes to nullid and other constant magic values. Start pushing them down from repository and revlog where sensible. Differential Revision: https://phab.mercurial-scm.org/D9465

repoview: separate concerns in _filteredrepotypes comment The cited issue in Python bugtracker is closed, but hasn't been fixed. We've been able to use the attached example and reproduce it with Python 3.9. The point where it turns from needless stress on the GC to the an actual leak is when one factors in the fact that the GC was before Python 3.4 unable to collect some types (see PEP 442). Note that even with Python 2.7, the simple example of cycles due to __mro__ are collectable. This was seen again with the example attached on the CPython issue.

repoview: fix memory leak of filtered repo classes The leak occurs in long-running server processes with extensions, and is measured at 110kB per request. Before this change, the contents of the `_filteredrepotypes` cache are not properly garbage collected, despite it begin a `WeakKeyDictionary`. Extensions have a tendency to generate a new repository class for each `localrepo` instantiation. Server processes based on `hgwebdir_mod` will instantiate a new `localrepo` for each HTTP request that involves a repository. As a result, with a testing process that repeatedly opens a repository with several extensions activated (`topic` notably among them), we see a steady increase in resident memory of 110kB per repository instantiation before this change. This is also true, if we call `gc.collect()` at each instantiation, like `hgwebdir_mod` does, or not. The cause of the leak is that the *values* aren't weak references. This change uses `weakref.ref` for the values, and this makes in our measurements the resident size increase drop to 5kB per repository instantiation, with no explicit call of `gc.collect()` at all. There is currently no reason to believe that this remaining leak of 5kB is related to or even due to Mercurial core. We've also seen evidence that `ui.ui` instances weren't properly garbage collected before the change (with the change, they are). This could explain why the figures are relatively high. In theory, the collection of weak references could lead to much more misses in the cache, so we measured the impact on the original case that was motivation for introducing that cache in 7e89bd0cfb86 (see also issue5043): `hg convert` of the mozilla-central repository. The bad news here is that there is a major memory leak there, both with and without the present changeset. There were no more cache misses, and we could see no more memory leak with this change: the resident size after importing roughly 100000 changesets was at 12.4GB before, and 12.5GB after. The small increase is mentioned for completeness only, and we believe that it should be ignored, at least as long as the main leak isn't fixed. At less than 1% of the main leak, even finding out whether it is merely noise would be wasteful. Original context where this was spotted and first mitigated: https://foss.heptapod.net/heptapod/heptapod/-/issues/466 The leak reduction was also obtained in Heptapod inner HTTP server, which amounts to the same as `hgwebdir_mod` for these questions. The measurements done with Python 3.9, similar figures seen with 3.8. More work on our side would be needed to give measurements with 2.7, because of testing server process does not support it.

repoview: style change in newtype() cache handling This way of writing it does not change the logic at all, but is more fit for the change we want to make in the next changeset. If anything, that's one dict lookup less in the hot path, but that should be non measurable.

tests: don't hard-code /bin/bash From Thomas Klausner in pkgsrc. Differential Revision: https://phab.mercurial-scm.org/D10507

lint: fix failing code check 8d2b62d716b0 introduced code that `test-check-code.t` wasn't happy about, this fixes it. Differential Revision: https://phab.mercurial-scm.org/D10506

typing: enable pytype processing on mercurial/upgrade_utils/actions.py This was the suggested workaround for the pytype bug that caused this file to be processed forever. Differential Revision: https://phab.mercurial-scm.org/D10460

incoming: use bytes for an error message Caught by pytype. Differential Revision: https://phab.mercurial-scm.org/D10461

merge: stable heads I forgot to pull before rolling rc1, so we just have a couple of patches that missed the rc1 train. Mea culpa.

Added signature for changeset 8d2b62d716b0

Added tag 5.8rc1 for changeset 8d2b62d716b0

relnote: mention a nodemap bug fixes The fix was in a3720569a43f. Differential Revision: https://phab.mercurial-scm.org/D10499

relnote: document the use of persistent-nodemap by default for Rust build Differential Revision: https://phab.mercurial-scm.org/D10498

relnode: document the move to `zstd` as default compression Differential Revision: https://phab.mercurial-scm.org/D10497

relnote: clarify the backward compatibility entry about p1/p2 swap The previous message might read a bit scary. So we clarify that the nodeid are not affected. Differential Revision: https://phab.mercurial-scm.org/D10496

mail: add a TODO about proper mbox locking Per @nbjoerg in IRC, the mbox isn't locked correctly. Differential Revision: https://phab.mercurial-scm.org/D10505

packaging: extract pre-computed version when running from plain tarball The tarballs created by setup.py are not including the usual archive markers that `hg archive` leaves, so the rewrite of the version number computation actually left the empty version string around. This meant that installations from PyPI would use 0.0.0 as version string. Differential Revision: https://phab.mercurial-scm.org/D10502

Added signature for changeset f67b8946bb1b

Added tag 5.8rc0 for changeset f67b8946bb1b

merge: default into stable for 5.8 rc

mail: force SMTPException to bytes before wrapping in error.Abort Pytype wasn't complaining about this for some reason, but PyCharm was and we already handle another instance of this exception the same way in this function. Differential Revision: https://phab.mercurial-scm.org/D10473

mail: split out the SMTP login to allow the keyring extension to wrap it The keyring extension only needs to tweak this tiny section of the larger function. But without any place to intercept the username/password fetching, it copy/pasted the entire function, and has grown a bunch of compatibility hacks to support older versions of Mercurial as well. Differential Revision: https://phab.mercurial-scm.org/D10471

store: exclude `undo.` nodemap's file from `walk` There are "temporary" local file that we should not be transfered by `walk` user like local clone and stream clone. This fix the small issue that the new tests highlighted. Differential Revision: https://phab.mercurial-scm.org/D10482

streamclone: treat volatile file as "fullfile" The nodemap related file might change (or get deleted) during the stream clone in a way incompatible with the streaming process. So we introduce a new flag for this type of file and integrate it with the existing `revlog_type` field recently added to `store.walk` returns. We use that new flat to dispatch such file to the existing mechanism for "atomic replacement" file for the nodemap docket and datafile. This fix the bugs we have been adding tests for. Strictly speaking, the nodemap datafile is happened only a could maybe be used in a slightly more efficient way, however this is good enough for now. Differential Revision: https://phab.mercurial-scm.org/D10481

nodemap: add a test about nodemap "vacuum" during stream clone When the nodemap "vacuum" it generate a new datafile, with a new unique name and delete the old one. This confuse the stream clone code and create the same kind of crash we were seeing in the previous patch. We build a test case where this happens. The next changeset will contains a fix We can also notice that we are, wrongfully exchanging `undo.*` files that the client will not be able to use. This will be dealt with soon. Differential Revision: https://phab.mercurial-scm.org/D10480

nodemap: add a test about racy commit during stream clone That test show that the resulting client nodemap is different from the server one. This happens because the server one transferred a corrupted node map. The data file match the pre-commit content while the docket has post commit content. As the result the nodemap was detected invalid and recomputed. When running without the rust implementation, the code is also generating a new datafile unconditionally, This mean the older file is no longer there are transfer time, resulting in a crash. We will fix this issue later, but we start with writing tests highlighting the issue. Differential Revision: https://phab.mercurial-scm.org/D10479

streamclone: remove sleep based "synchronisation" in tests Sleep based test synchronisation does not work. Variation in machine performance and load can make the two process miss their windows. Instead we migrate to explicit signaling through the file system as other tests file are using. Differential Revision: https://phab.mercurial-scm.org/D10478

testing: add a `write_file` function The function is kinda trivial, but having a simple function avoid silly mistake. Differential Revision: https://phab.mercurial-scm.org/D10477

testing: add a utility function to wait for file create This is similar to `tests/testlib/wait-on-file`, but for the python code Differential Revision: https://phab.mercurial-scm.org/D10476

streamclone: check the errors log in tests Code can be buggy, in that case having error message tend to help. Differential Revision: https://phab.mercurial-scm.org/D10475

mail: use a context manager when writing to mbox Differential Revision: https://phab.mercurial-scm.org/D10484

errors: remove unnecessary varargs handling from OutOfBandError In my recent D10465, I moved some code over from scmutil into `OutOfBandError.__init__`. The code was written to deal with an arbitrary number of `message` arguments to the constructor. It turns out that we only ever pass 0 or 1. Given that, let's simplify it. Differential Revision: https://phab.mercurial-scm.org/D10483

phab-refresh: use a special comment on the stable branch Phabricator make it hard to spot the branch information. As a result patch intended for stable are consistently queued for default. We add a special command and flashy GIF to try to attract reviewer attention on the fact patch are intended for stable. Differential Revision: https://phab.mercurial-scm.org/D10464

phab-refresh: extract the comment in a variable This make the script more readable and it is about to become more complex. Differential Revision: https://phab.mercurial-scm.org/D10463

tests: make test-archive.t pass on py3.9 (issue6504) Something got stricter at parsing URL query parameters and now the parameters need to be separated by "&"; ";" is no longer allowed. See issue6504 for details. Differential Revision: https://phab.mercurial-scm.org/D10472

errors: raise RemoteError in some places in exchange.py This is part of https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan Differential Revision: https://phab.mercurial-scm.org/D10467

errors: introduce a class for remote errors Having an exception for remote errors makes it much easier to exit with the right detailed exit code. Differential Revision: https://phab.mercurial-scm.org/D10466

errors: make OutOfBandError extend Abort I'm about to create a new `RemoteError` exception and make `OutOfBandError` extend it. This patch prepares for that. Differential Revision: https://phab.mercurial-scm.org/D10465

revlog: replace revlog._io.size with a new revlog.index.entry_size The `revlogio` class is mostly a relic from the past. Once in charge of the full revlog related Input/Output code, that class gradually lost responsibilities to the point where more IO are now done by `revlog.index` objects or revlog objects themself. I would like to ultimately remove the `revlogio` class, to do so I start simple with move the "entry size" information on the index. (The index is already responsible of the binary unpacking, so it knows the size. Differential Revision: https://phab.mercurial-scm.org/D10309

perf-discovery: use `get_unique_pull_path` This performance command now use the new API, unless the benchmarked Mercurial is older. Differential Revision: https://phab.mercurial-scm.org/D10423

help: clarify when `$HG_URL` and `$HG_SOURCE` are added in hooks Differential Revision: https://phab.mercurial-scm.org/D10400

nodemap: deal with data mmap error If the file is too small, the mmapread call would raise a ValueError. We catch that and ignore nodemap content (as we do without mmap). This make the repository slightly slower (until the next write) but usable. Unlike the current crash. Differential Revision: https://phab.mercurial-scm.org/D10458

nodemap: test various corruption scenario for the persistent nodemap Corruption can happens in the wild, either because some of our code is buggy or because repository were shared/transfered in a strange manners. Currently one of the corruption case (not enough data) lead to a crash. We add explicit tests for theses cases. Differential Revision: https://phab.mercurial-scm.org/D10457

cmdutil: fix an uninitialize variable usage in clearunfinished() I happened to notice that PyCharm flagged this while looking for something else. I'm pretty sure it meant to check the current state in the iteration, and not keep reusing the last one in the previous iteration. Differential Revision: https://phab.mercurial-scm.org/D10459

help: document `$HG_NEW_OBSMARKERS` in pretxnclose hook Differential Revision: https://phab.mercurial-scm.org/D10399

help: prepend environment variables used in hooks with "$" Most of them have "$" prefix but some don't, so adding it for consistency. Differential Revision: https://phab.mercurial-scm.org/D10398

revset: drop an outdated comment There is not `ui.expandpath` call there anymore. Differential Revision: https://phab.mercurial-scm.org/D10435

ui: deprecated `ui.expandpath` This function return a single path, something incompatible with the coming change to `[paths]` definition to allow multiple associated urls. Now that all user got migrated, we deprecate the function. Differential Revision: https://phab.mercurial-scm.org/D10432

urlutil: remove usage of `ui.expandpath` in `get_clone_path` We want to deprecate `ui.expandpath` and simplify the code before adding more complexity in the form of `[paths]` entry pointing to multiple url. So we inline the relevant bits. Differential Revision: https://phab.mercurial-scm.org/D10431

urlutil: remove usage of `ui.expandpath` in `get_unique_pull_path` We want to deprecate `ui.expandpath` and simplify the code before adding more complexity in the form of `[paths]` entry pointing to multiple url. So we inline the relevant bits. Differential Revision: https://phab.mercurial-scm.org/D10430

urlutil: remove usage of `ui.expandpath` in `get_pull_paths` We want to deprecate `ui.expandpath` and simplify the code before adding more complexity in the form of `[paths]` entry pointing to multiple url. So we inline the relevant bits. Differential Revision: https://phab.mercurial-scm.org/D10429

debugbackupbundle: use `get_unique_pull_path` This is the last known user of `ui.expandpath` outside of `urlutil`. Hooray. Differential Revision: https://phab.mercurial-scm.org/D10428

debugssl: use `get_unique_pull_path` Let's move this code to the new API. Differential Revision: https://phab.mercurial-scm.org/D10427

debugdiscovery: use `get_unique_pull_path` Lets move this code to the new API. Differential Revision: https://phab.mercurial-scm.org/D10426

profiling: use `util.expandpath` instead of `ui.expandpath` for output Given we are talking about the path to an output file, I am fairly certain that the initial author meant to expand `~` and the like and not to resolve entry from `[paths]`. Differential Revision: https://phab.mercurial-scm.org/D10425

dispatch: use the new API to resolve --repository An even weirder feature of Mercurial is the ability to use `[paths]` alias as value of `--repository`. The weird feature now use the new APIs. Differential Revision: https://phab.mercurial-scm.org/D10424

revset: use `get_unique_pull_path` for `remote(…)` This one is also resolving path. For now we restrict the feature to a single destination. This might change in the future. Differential Revision: https://phab.mercurial-scm.org/D10422

remotefilelog: use `get_unique_pull_path` in `getflogheads` Another command moved to the new API, hooray. Differential Revision: https://phab.mercurial-scm.org/D10421

summary: use the new APIs Summary can perform some incoming/outgoing queries (that should be common to the other command with the same needs, but that is another story). We now use the new APIs to do so. The current code behavior is a bit fishy, relying to the fact "default" will be picked as the destination in last resort. I did not altered that, but left various comment to highlight the issue. Differential Revision: https://phab.mercurial-scm.org/D10420

share: use `get_clone_path` Since `hg share` is mostly like clone, do the same changes there. Differential Revision: https://phab.mercurial-scm.org/D10419

init: use `get_clone_path` when suitable `hg init` has this weird feature were you can refer to `[paths]` entry select the path to initialize. We move that code to the new APIs. Differential Revision: https://phab.mercurial-scm.org/D10418

clone: use `get_clone_path` "Surprisingly", the new API is well suited for `hg clone` too. Differential Revision: https://phab.mercurial-scm.org/D10417

incoming: kill the `repo._subtoppath =` hack We do the same as for `hg outgoing`, instead of relying on implicit passing value by monkey punching them onto the repo object, we pass equivalent information by argument to the proper function. This is way cleaner. Differential Revision: https://phab.mercurial-scm.org/D10416

identify: use `get_unique_pull_path` The command only support a single destination. We use the associated API. Differential Revision: https://phab.mercurial-scm.org/D10415

bundle: support multiple destinations `hg outgoing` and `hg push` now support multiple destination. We do the same for `hg bundle`. Various other commands needs this kind of behavior and it would be create to factor this code out for their usage. However this is an adventure for another time. They are some minor change to the tests (in addition to the new test for the feature): * one because I updated a message to plurals, * another one because the error changed, and I actually find it clearer. Differential Revision: https://phab.mercurial-scm.org/D10414

lfs: use the new APIs The part of the lfs store that requires a destination cannot operate on multiple destination (yet). So we move them to the dedicated APIs. Differential Revision: https://phab.mercurial-scm.org/D10413

fastannotate: use `get_unique_pull_path` The code does not support multiple destination yet, so lets move it to the dedicated API. Differential Revision: https://phab.mercurial-scm.org/D10412

remotefilelog: use the right expandpath in to expand `~` Given the context where path is most likely a file system path, I suspect that the initial author confused ui.expandpath and util.expandpath (a proxy for os.path.expanduser and co) Differential Revision: https://phab.mercurial-scm.org/D10411

transplant: use `get_unique_pull_path` The command does not support multiple destination (yet). Differential Revision: https://phab.mercurial-scm.org/D10410

infinitepush: use `get_unique_pull_path` The extension does not support multiple destination (yet). Differential Revision: https://phab.mercurial-scm.org/D10456

relink: use `get_unique_pull_path` The code does not support multiple destination and will probably never do so. So lets use the dedicated API for this case. Differential Revision: https://phab.mercurial-scm.org/D10409