nodemap: provide the on disk data to indexes who support it Time to start defining the API and prepare the rust index support. We provide a method to do so. We use a distinct method instead of passing them in the constructor because we will need this method anyway later (to refresh the mmap once we update the data on disk). Differential Revision: https://phab.mercurial-scm.org/D7847

nodemap: all check that revision and nodes match in the nodemap More check is always useful. Differential Revision: https://phab.mercurial-scm.org/D7846

nodemap: add basic checking of the on disk nodemap content The simplest check it so verify we have all the revision we needs, and nothing more. Differential Revision: https://phab.mercurial-scm.org/D7845

nodemap: code to parse the persistent binary nodemap data We now have code to read back what we persisted. This will be put to use in later changesets. Differential Revision: https://phab.mercurial-scm.org/D7844

nodemap: move the iteratio inside the Block object Having the iteration inside the serialization function does not help readability. Now that we have a `Block` object, let us move that code there. Differential Revision: https://phab.mercurial-scm.org/D7843

nodemap: use an explicit "Block" object in the reference implementation This will help us to introduce some test around the data currently written on disk. Differential Revision: https://phab.mercurial-scm.org/D7842

nodemap: add a optional `nodemap_add_full` method on indexes This method can be used to obtains persistent data for a full nodemap. The end goal is for some index implementation to managed the nodemap serialization them selves (eg: the rust implementation) Differential Revision: https://phab.mercurial-scm.org/D7841

nodemap: add a (python) index class for persistent nodemap testing Using the persistent nodemap require a compeling performance boost and an existing implementation. The benefit of the persistent nodemap for pure python code is unclear and we don't have a C implementation for it. Yet we would like to actually start testing it in more details and define an API for using that persistent nodemap. We introduce a new `devel` config option to use an index class dedicated to Nodemap Testing. This feature is "pure" only because having using a pure-python index with the `cext` policy proved more difficult than I would like. There is nothing going on in that class for now, but the coming changeset will change that. Differential Revision: https://phab.mercurial-scm.org/D7840

nodemap: delete older raw data file when creating a new ones When we write new full files, it replace an older one with a different name. We add the associated cleanup for the older file to be removed after the transaction. We delete all file matching the expected pattern to give use extra chance to delete orphan files we might have failed to delete earlier. Note: eventually we won't rewrite all data for each transaction. This is coming in later changesets. Differential Revision: https://phab.mercurial-scm.org/D7839

nodemap: use an intermediate "docket" file to carry small metadata This intermediate file will make mmapping, transaction and content validation easier. (Most of this usefulness will arrive gradually in later changeset). In particular it will become very useful to append new data are the end of raw file instead of rewriting on the file on each transaction. See in code comments for details. Differential Revision: https://phab.mercurial-scm.org/D7838

nodemap: only use persistent nodemap for non-inlined revlog Revlog are inlined while they are small (to avoid having too many file to deal with). The persistent nodemap will only provides a significant boost for large enough revlog index. So it does not make sens to add an extra file to store nodemap for small revlog. We could consider inclining the nodemap data inside the revlog itself, but the benefit is unclear so let it be an adventure for another time. Differential Revision: https://phab.mercurial-scm.org/D7837

nodemap: add a function to read the data from disk This changeset is small and mostly an excuse to introduce an API function reading the data from disk. Differential Revision: https://phab.mercurial-scm.org/D7836

nodemap: write nodemap data on disk Let us start writing data on disk (so that we can read it from there later). This series of changeset is going to focus first on having data on disk and updating it. Right now the data is written right next to the revlog data, in the store. We might move it to cache (with proper cache validation mechanism) later, but for now revlog have a storevfs instance and it is simpler to us it. The right location for this data is not the focus of this series. Differential Revision: https://phab.mercurial-scm.org/D7835

nodemap: have some python code writing a nodemap in persistent binary form This python code aims to be as "simple" as possible. It is a reference implementation of the data we are going to write on disk (and possibly, later a way for pure python install to make sure the on disk data are up to date). It is not optimized for performance and rebuild the full data structure from the index every time. This is a stepping stone toward a persistent nodemap on disk. Differential Revision: https://phab.mercurial-scm.org/D7834

cleanup: re-run black on the codebase Looks like a few patches have landed without having been blackened. I strongly suspect I should write a patch for baymax that blackens things on the way in... # skip-blame automatic formatting Differential Revision: https://phab.mercurial-scm.org/D8104

rust-re2: add wrapper for calling Re2 from Rust This assumes that Re2 is installed following Google's guide. I am not sure how we want to integrate it in the project, but I think a follow-up patch would be more appropriate for such work. As it stands, *not* having Re2 installed results in a compilation error, which is a problem as it breaks install compatibility. Hence, this is gated behind a non-default `with-re2` compilation feature. Differential Revision: https://phab.mercurial-scm.org/D7910

rust-filepatterns: add support for `include` and `subinclude` patterns This prepares a future patch for `IncludeMatcher` on the road to bare `hg status` support. Differential Revision: https://phab.mercurial-scm.org/D7909

rust-filepatterns: improve API and robustness for pattern files parsing Within the next few patches we will be using this new API. Differential Revision: https://phab.mercurial-scm.org/D7908

tests: add workaround for bzr bug This started failing for me today. I guess my bzr was upgraded. Differential Revision: https://phab.mercurial-scm.org/D8105

rust-utils: add util for canonical path Differential Revision: https://phab.mercurial-scm.org/D7871

test: simplify test-amend.t to avoid race condition Insted on relying on sleep, we could simply have the editor do the file change. This remove the reliance on "sleep" and avoid test failing on heavy load machine. To test this, I reverted the code change in 5558e3437872 and the test started failing again. This is a graft on stable of 141ceec06b55 which should have targeted for stable. Differential Revision: https://phab.mercurial-scm.org/D8103

remotefilelog-test: glob some flaky output line (issue6083) The two following lines are flaky underload, yet the final result is correct. The command involves background pre-check of output, these are not stable probably because they run in parallel in multiple process. I spent a couple of hours trying to understand the pattern and gave up. The documented intend of these tests is safely guaranteed by checking the cache content after the command. If it become useful to start testing precise internal details of the, they will have to be tested in a more appropriate framework than `.t` tests. Differential Revision: https://phab.mercurial-scm.org/D8102

httpconnection: allow `httpsendfile` subclasses to suppress the progressbar This will be neccessary for LFS, which manages the progressbar outside of the file. Differential Revision: https://phab.mercurial-scm.org/D7960

rust-dirstatemap: add `NonNormalEntries` class This fix introduces the same encapsulation as the `copymap`. There is no easy way of doing this any better for now. `hg up -r null && time HGRCPATH= HGMODULEPOLICY=rust+c hg up tip` on Mozilla Central, (not super recent, but it doesn't matter): Before: 7:44,08 total After: 1:03,23 total Pretty brutal regression! Differential Revision: https://phab.mercurial-scm.org/D8049

help: when possible, indicate flags implied by tweakdefaults Differential Revision: https://phab.mercurial-scm.org/D8101

help: add a mechanism to change flags' help depending on config It seems reasonable to have a similar mechanism for the rest of the help, but no such thing is implemented. The goal is to make the help of commands clearer in the presence of significant default changes, like tweakdefaults or with company-wide hgrcs. In these cases, a user looking at the help of a command doesn't exactly know what his hgrc is doing. Apply to this to the --git option of commands that display diffs, as this option in particular causes confusion for some reason. Differential Revision: https://phab.mercurial-scm.org/D8100

lfs: use str for the open() mode when opening a blob for py3 The other fix for this was to leave the mode as bytes, and import `pycompat.open()` like a bunch of other modules do. But I think it's confusing to still use bytes at the python boundary, and obviously error prone. Grepping for ` open\(.+, ['"][a-z]+['"]\)` and ` open\(.+, b['"][a-z]+['"]\)` outside of `tests`, there are 51 and 87 uses respectively, so it's not like this is a rare direct usage. Differential Revision: https://phab.mercurial-scm.org/D8099

rust-dirstatemap: cache non normal and other parent set Performance of `hg update` was significantly worse since the introduction of the Rust `dirstatemap`. This regression was noticed by Valentin Gatien-Baron when working on a large repository, as it goes unnoticed for smaller repositories like Mercurial itself. This fix introduces the same getter/setter mechanism at `hg-core` level as for `set/get_dirs`. While this technique is, as previously discussed, quite suboptimal, it fixes an important enough problem. Refactoring `hg-core` to use the typestate pattern could be a good approach to improving code quality in a future patch. Differential Revision: https://phab.mercurial-scm.org/D8048

tags: behave better if a tags cache entry is partially written This is done by discarding any partial cache entry, instead of filling the partial cache entry with 0xff before. Differential Revision: https://phab.mercurial-scm.org/D8095

tags: show how hg behaves if a tags cache entry is truncated I'm seeing an error of this form in production on the order of once a month. I'm not sure how it happens, but I suspect interrupting a pull might result in half written cache entries. Differential Revision: https://phab.mercurial-scm.org/D8094

tags: add a debug command to display .hg/cache/hgtagsfnodes1 Differential Revision: https://phab.mercurial-scm.org/D8093

purge: add -i flag to delete ignored files instead of untracked files It's convenient for deleting build artifacts. Using --all instead would delete other things too. Differential Revision: https://phab.mercurial-scm.org/D8096