dirstate-item: allow mtime to be None in "parentdata" This will be useful to filter out unreliable mtime. Differential Revision: https://phab.mercurial-scm.org/D11782

dirstate: add a comment about a racy piece of code during updates This is a bit that is not really correct but works "fine" in practice. Let us write the details down so that people stop wondering how that logic might be correct… It is not. Differential Revision: https://phab.mercurial-scm.org/D11781

tests: add missing `head` for when things go wrong See comment above the changed line, you can get a millions of line of output in case of failure. When don't need to have them all. Differential Revision: https://phab.mercurial-scm.org/D11780

tests: ensure a status will have non ambiguous mtime in some race test For the test to work, we need some mtime to be recorded. For them to be recorded, they need to be "clearly in the past", otherwise edit with the same mtime would be possible. Strictly speaking there might be file system with a minimal mtime increment longer than one second. However it is unlikely that we will run the test on them for now. We can be smarter about this in the future if it becomes necessary. Differential Revision: https://phab.mercurial-scm.org/D11779

tests: make sure no ambiguities remains after the commit This will help to stabilize part of the test that are not relevant for what is actually tested. Differential Revision: https://phab.mercurial-scm.org/D11778

dirstate: clarify a `hg update` invocation in a test It is common for readers of that test to confuse the `hg co` call with a `hg commit`, while it actually means `hg checkout`, an alias for the more common `hg update. So let us use the clearer version. Differential Revision: https://phab.mercurial-scm.org/D11777

test: mark rhg output as flaky rhg is not updating the dirstate on status yet, which make this part of the test flaky. This will be fixed soon. Differential Revision: https://phab.mercurial-scm.org/D11833

chistedit: explain which order the commits are presented in It's not obvious which order the commits in chistedit (and text-based histedit), so let's add a note about it. Differential Revision: https://phab.mercurial-scm.org/D11832

errors: use detailed error for invalid commit-extras argument Differential Revision: https://phab.mercurial-scm.org/D11831

errors: use detailed exit code in pathauditor Differential Revision: https://phab.mercurial-scm.org/D11830

errors: use detailed exit code for RepoLookupError Differential Revision: https://phab.mercurial-scm.org/D11829

errors: use detailed exit code for detected case-collision Differential Revision: https://phab.mercurial-scm.org/D11828

errors: use detailed exit code when trying to merge file outside narrowspec Differential Revision: https://phab.mercurial-scm.org/D11827

errors: use detailed exit code for non-integer number of diff context lines Differential Revision: https://phab.mercurial-scm.org/D11826

patch: add hint about mangled whitespace on bad patch One of the most common reasons that a patch doesn't apply is because its whitespace has been mangled (e.g. by their mail client or though copy&paste). Let's provide a hint about that. Differential Revision: https://phab.mercurial-scm.org/D11825

errors: return more detailed errors when failing to parse or apply patch This patch adds subclasses of `PatchError` so we can distinguish between failure to parse a patch from failure to apply it. It updates the callers to raise either `InputError` or `StateError` depending on which type of error occurred. Differential Revision: https://phab.mercurial-scm.org/D11824

extensions: add a default "*" suboptions prefix This is similar to what we do in other section (e.g. `paths`) and allow to change the behavior for all extensions. Sub options on individual extensions overwrite the default settings. Differential Revision: https://phab.mercurial-scm.org/D11823

extension: add a `required` suboption to enforce the use of an extensions If `required` is set, failing to load an extensions will abort. See the test and documentation for details. Differential Revision: https://phab.mercurial-scm.org/D11822

extensions: highlight the name of the faulty extensions in the error message This make it easier to understand the message when the extensions name is common. Differential Revision: https://phab.mercurial-scm.org/D11821

extensions: refactor handling of loading error make it reusable We will need this in the next patch. Differential Revision: https://phab.mercurial-scm.org/D11820

extensions: ignore "sub-options" when looking for extensions config suboptions are separated by ":" (see the path one for example). So we dont want to confuse these config with actual extensions. We don't have extensions sub option yet, but I am about to introduce one for making sure an extensions can load. So lets level the floor first. Differential Revision: https://phab.mercurial-scm.org/D11819

automation: support Python 3.10 on Windows Python 3.10 is out and we should support it. This commit teaches the automation code to install and support building for Python 3.10. Differential Revision: https://phab.mercurial-scm.org/D11776

contrib: update Windows environment to Python 3.9.9 Let's keep the environment modern. Differential Revision: https://phab.mercurial-scm.org/D11775

rhg: implement the debugignorerhg subcommand This can be used to inspect the generated pattern, but also to benchmark the time it takes to parse hgignore. Differential Revision: https://phab.mercurial-scm.org/D11722