errors: move similarity_hint() to error module I want to be able to reuse it from `UnknownIdentifier`'s constructor. Moving it results in a new import of `difflib` in the `error` module. There was a comment at the top of `error.py` saying "Do not import anything but pycompat here, please", which was added (except for the "pycompat" bit) in 08cabecfa8a8 (errors: move revlog errors, 2009-01-11). I don't know the reason for the comment. I'm guessing the point was to not make the module depend on other Mercurial modules. If that was it, then importing `difflib` should be fine. Sorry about the churn (I moved this code from the `dispatch` module to the `scmutil` module very recently). Differential Revision: https://phab.mercurial-scm.org/D9345

errors: morph reportsimilar() into similarity_hint() The next step is to eagerly create the hint in `UnknownIdentifier`'s constructor. Differential Revision: https://phab.mercurial-scm.org/D9344

errors: restructure formatparse() to clarify conditions a bit The `similar` list will be calculated only for `error.UnknownIdentifier`. It was then printed only if `inst.location is None`, which is true for that exception type, but it's an indirect condition to rely on. Also, it looked from the code like it could both report similarities and print a hint. That would be a little awkward because the similarity report looks similar to the hint (both are printed within parentheses). I also added a `elif` to clarify that. I plan to refactor this more coming patches so the similarity report actually is a hint. Differential Revision: https://phab.mercurial-scm.org/D9343

pyoxidizer: run buildifier Differential Revision: https://phab.mercurial-scm.org/D9342

errors: raise InputError in `hg absorb` Differential Revision: https://phab.mercurial-scm.org/D9340

errors: introduce CanceledError and use it in a few places This very similar to earlier patches (e.g. for `InputError`) and part of https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan. Differential Revision: https://phab.mercurial-scm.org/D9339

errors: raise InputError in `hg split` Differential Revision: https://phab.mercurial-scm.org/D9338

errors: raise StateError in `hg bisect` Differential Revision: https://phab.mercurial-scm.org/D9337

errors: raise InputError in `hg debugobsolete` Differential Revision: https://phab.mercurial-scm.org/D9336

errors: raise InputError when line range to followlines() is out of bounds Differential Revision: https://phab.mercurial-scm.org/D9333

transaction: split new files into a separate set Journal entries with size 0 are common as they represent new revlog files. Move them from the dictionary into a set as the former is more dense. This reduces peak RSS by 70MB for the NetBSD test repository with around 450k files under .hg/store. Differential Revision: https://phab.mercurial-scm.org/D9278

transaction: change list of journal entries into a dictionary The transaction object used to keep a mapping table of path names to journal entries and a list of journal entries consisting of path and file offset to truncate on rollback. The offsets are used in three cases. repair.strip and rollback process all of them in one go, but they care about the order. For them, it is perfectly reasonable to read the journal back from disk as both operations already involve at least one system call per journal entry. The other consumer is the revlog logic for moving from inline to external data storage. It doesn't care about the order of the journal and just needs to original offset stored. Further optimisations are possible here to move the in-memory journal to a set(), but without memoisation of the original revlog size this could turn it into O(n^2) behavior in worst case when many revlogs need to migrated. Differential Revision: https://phab.mercurial-scm.org/D9277

transaction: rename find to findoffset and drop backup file support transaction.find used to support access to both the regular file and backup file list. They have different formats, so any consumer has to be aware of the difference alredy. There is no in-core consumer for the backup file access, so don't provide it. Differential Revision: https://phab.mercurial-scm.org/D9276

transaction: drop per-file extra data support At the moment, transactions support an optional extra data argument for all files to be stored in addition to the original offset. This is used in core only by the revlog inline to external data migration. It is used to memoize the number of revisions before the transaction. That number of can be computed during the walk easily, so drop the requirement. Differential Revision: https://phab.mercurial-scm.org/D9275

templates: define a {onelinesummary} keyword It is sometimes useful to be able to use the configured `command-template.oneline-summary` in higher-level templates. For example, I would like to use it in an internal template that lists commits in a "review unit" (kind of a pull request). This patch adds support for that. We may want to define a way of formatting a context using a command-specific override (from `command-templates.oneline-summary.<command>`), but that will have to be a template function instead. I don't plan to do that, but I'm mentioning it now in case reviewers would prefer that we use a no-arg function (i.e. `{onelinesummary()}`) already today to prepare for that. Differential Revision: https://phab.mercurial-scm.org/D9314

relnotes: document new [command-templates] section Differential Revision: https://phab.mercurial-scm.org/D9266

help: document the new [command-templates] config section Differential Revision: https://phab.mercurial-scm.org/D9265

strip: move into core As discussed at the 5.2 sprint, replace strip extension by a core command, debugstrip. Obviously, the extension stays for backwards compatibility. As an implementation note, I moved the strip file as is into core, which is not done elsewhere, AFAIK. I could have inlined it into debugcommands, but that doesn't sound great. Differential Revision: https://phab.mercurial-scm.org/D9285

revlog: pass sidedata argument to flagutil.processflagswrite() Bug found through pytype. Differential Revision: https://phab.mercurial-scm.org/D9280

pure: guard against empty blocks If blocks is empty, we append `None` to the returned list, which is incorrect. This subtle issue was caught by pytype, which correctly identified the return value as List[Optional[Tuple]] because of this possibility. Differential Revision: https://phab.mercurial-scm.org/D9279

rust-status: don't bubble up os errors, translate them to bad matches In the rare cases when either the OS/filesystem throws an error on an otherwise valid action, or because a path is not representable on the filesystem, or because of concurrent actions in the filesystem, we want to warn the user about said path instead of bubbling up the error, causing an exception to be raised in the Python layer. Differential Revision: https://phab.mercurial-scm.org/D9320

rust-status: properly translate OSError to Python This is probably never going to be called after the next few patches, but we might as well make sure this is done correctly for the future rewrite. Differential Revision: https://phab.mercurial-scm.org/D9319

shelve: clear merge state after partial shelve Differential Revision: https://phab.mercurial-scm.org/D9335

tests: show that interactive shelve can leave the repo with a merge state If part of a file is shelved (as we already do in a test), there will be an unfinished merge state left after `hg shelve` finishes. There should never be a merge conflict and there should never be a reason that the user would like to re-resolve conflicts, so we should clear that state (see next patch). Differential Revision: https://phab.mercurial-scm.org/D9334

histedit: disable color while rendering template for use in plan Differential Revision: https://phab.mercurial-scm.org/D9324

tests: show how `hg histedit` can put color codes in histedit plan Differential Revision: https://phab.mercurial-scm.org/D9323

split: disable color while rendering template for use in commit message Differential Revision: https://phab.mercurial-scm.org/D9322

tests: show how `hg split` can put color codes in commit template With D9255, I made it so `hg split` respects the `commmand-templates.oneline-summary` config. I don't think I realized that the output I modified was being put in a commit message template. The result was that if you have coloring enabled, you get colors in the commit template. This patch show that. The test is unfortunately pretty verbose (like most other `hg split` tests) and shows a bunch of irrelevant "color codes" (templater labels). Differential Revision: https://phab.mercurial-scm.org/D9321

dispatch: move some helper functions down into scmutil I plan to reuse `formatparse()` in the next patch. Differential Revision: https://phab.mercurial-scm.org/D9331

errors: raise more specific errors from rewriteutil Differential Revision: https://phab.mercurial-scm.org/D9330

chgserver: backport py3 buffered I/O workarounds from procutil I've recently switched to new machine and I found chg's stdout is fully buffered. Even though chg server is a daemon process, it inherits the environment where the chg client originally forked the server. This means the server's stdout might have been wrapped by LineBufferedWrapper. That's why we need to do wrap/unwrap in both ways. The "if" condition in _restoreio() looks weird, but I'm not willing to clean things up because stdio behavior is fundamentally different between py2 and py3, and py2 support will be dropped anyway.

errors: use InputError for some errors on `hg clone` Differential Revision: https://phab.mercurial-scm.org/D9329

errors: raise InputError when given non-existent paths etc Differential Revision: https://phab.mercurial-scm.org/D9328

errors: use InputError for errors about bad label names (tags etc) Differential Revision: https://phab.mercurial-scm.org/D9327

errors: use InputError for errors about bad paths Differential Revision: https://phab.mercurial-scm.org/D9326

destutil: raise more specific error when histedit.defaultrev is empty Differential Revision: https://phab.mercurial-scm.org/D9313

errors: raise more specific errors when default remote not configured Differential Revision: https://phab.mercurial-scm.org/D9312

errors: set detailed exit code to 30 for config errors This is per https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan. Differential Revision: https://phab.mercurial-scm.org/D9311

errors: introduce StateError and use it from commands and cmdutil This very similar to an earlier patch (which was for `InputError`). In this patch, I also updated the transplant extension only because `test-transplant.t` would otherwise have needed a `#if continueflag`. Differential Revision: https://phab.mercurial-scm.org/D9310

errors: set detailed exit code to 100 for some remote errors This is per https://www.mercurial-scm.org/wiki/ErrorCategoriesPlan. Differential Revision: https://phab.mercurial-scm.org/D9309

errors: catch urllib errors specifically instead of using safehasattr() Before this patch, we would catch `IOError` and `OSError` and check if the instance had a `.code` member (indicates `HTTPError`) or a `.reason` member (indicates the more generic `URLError`). It seems to me that can simply catch those exception specifically instead, so that's what this code does. The existing code is from fbe8834923c5 (commands: report http exceptions nicely, 2005-06-17), so I suspect it's just that there was no `urllib2` (where `URLError` lives) back then. The old code mentioned `SSLError` in a comment. The new code does *not* try to catch that. The documentation for `ssl.SSLError` says that it has a `.reason` property, but `python -c 'import ssl; print(dir(ssl.SSLError("foo", Exception("bar"))))` doesn't mention that property on either Python 2 or Python 3 on my system. It also seems that `sslutil` is pretty careful about converting `ssl.SSLError` to `error.Abort`. It also is carefult to not assume that instances of the exception have a `.reason`. So I at least don't want to catch `ssl.SSLError` and handle it the same way as `URLError` because that would likely result in a crash. I also wonder if we don't need to handle it at all (because `sslutil` might handle all the cases). It's now early in the release cycle, so perhaps we can just see how it goes? Differential Revision: https://phab.mercurial-scm.org/D9318

errors: raise InputError in fancyopts If a value of wrong type is passed to a command line flag, that's cleary an InputError. Differential Revision: https://phab.mercurial-scm.org/D9308

packaging: switch centos 7 packaging to python 3 Differential Revision: https://phab.mercurial-scm.org/D9293

packaging: remove centos5 and centos6 support Differential Revision: https://phab.mercurial-scm.org/D9292

test-filecache: use sys.executable to call python As was mentioned in c102b704edb5, test scripts calling 'python' or 'python3' might use the wrong python. For test-filecache.py, this causes a failed test on CentOS 7. Differential Revision: https://phab.mercurial-scm.org/D9295

make: add a pyoxidizer target Differential Revision: https://phab.mercurial-scm.org/D9291

pyoxidizer: switch to modern config using run_command instead of run_mode Differential Revision: https://phab.mercurial-scm.org/D9290

pyoxidizer: default to one-file binary on non-Windows platforms Windows has some extra constraints that require a multi-file install, but we expect folks to use an MSI or similar installer there so it's less of a big deal. Differential Revision: https://phab.mercurial-scm.org/D9289