histedit: conditionalize the imports of 'fcntl' and 'termios' The recent import of chistedit in c36175456350 made Windows sad. I'm not sure if there's other stuff that needs to be done here (e.g. change the default interface), but this makes the tests run again. It would have been nicer if the error message indicated these modules were the problem, but instead it said "*** failed to import extension histedit: No module named histedit". I'm not sure if there's anything we can do about that.

logtoprocess: update commandfinish options arguments d2c997b8001f changed the logtoprocess API with the effect of not exposing the positional arguments to the logtoprocess scripts anymore. We have some scripts that use the duration and return code of the "commandfinish" event to monitor hg calls. Update the logging of the "commandfinish" to expose those values as options argument, which will be accessible as `OPT_RETURN_CODE` and `OPT_DURATION` in logtoprocess arguments. The code has been formatted with Black. Differential Revision: https://phab.mercurial-scm.org/D5282

rebase: fix two ui.logs to actually have text when using default blackbox log Some implementations of ui.log record structured information along with the ui.log which can be used for metrics, but ui.log() as implemented by the blackbox logging does not do anything special with this, and we end up with a log line with no text (not even a line break) so it ends up looking something like: date time user @node (pid) [rebase]> date time user @node (pid) ... Differential Revision: https://phab.mercurial-scm.org/D5279

wireprotov2server: let repo.narrowmatch(match) do matcher intersection This is supported since 4fd0fac48922 (localrepo: allow narrowmatch() to accept matcher to intersect with, 2018-09-28). Differential Revision: https://phab.mercurial-scm.org/D5281

blackbox: extract function to test if log event is tracked This will be a required method of the logger interface.

blackbox: initialize inlog flag properly And ditch the "bb" prefix as it's no longer a ui extension class.

blackbox: initialize repo attribute properly And ditch the "bb" prefix as it's no longer a ui extension class.

blackbox: unindent "if True" block

blackbox: extract logger class from ui wrapper This moves most functions to new blackboxlogger class. The ui wrapper will be removed later.

blackbox: rename variables to prepare extracting core logic from ui wrapper I'm going to add ui.setlogger() function so that I can enable logging feature in command server without extending ui.__class__. This prepares for it. "self" will be a logger instance, so this patch renames some of them to "ui".

sparse-revlog: rework the way we enforce chunk size limit We move from a O(N) algorithm to a O(log(N)) algorithm. The previous algorithm was traversing the whole delta chain, looking for the exact point where it became too big. This would result in most of the delta chain to be traversed. Instead, we now use a "binary" approach, slicing the chain in two until we have a chunk of the appropriate size. We still keep the previous algorithm for the snapshots part. There are few of them and they are large bits of data distant from each other. So the previous algorithm should work well in that case. To take a practical example of restoring manifest revision '59547c40bc4c' for a reference NetBeans repository (using sparse-revlog). The media time of the step `slice-sparse-chain` of `perfrevlogrevision` improve from 1.109 ms to 0.660 ms.

doctest: add a `issnapshot` method to _testrevlog We'll need it soon.

tests: add `revlogutils.deltas` module to doctests The doctest in these module have been from `mercurial.revlog` but the module was not added to the doctests. Spotted by Yuya Nishihara.

merge with stable

mergetools: adjust Beyond Compare config on Mac/Linux Set the labels of the Linux and Mac versions of Beyond Compare from Mercurial's builtin variables, same as the Windows version. Differential Revision: https://phab.mercurial-scm.org/D5255

rewriteutil: move publicrevs closer to where it's used

requires: use atomictemp=True when writing .hg/requires We use an unusual file system at Google that allows writes (and renames) but not deletions (for certain paths). That causes problems when writing the requires files without atomictemp=True. There doesn't appear to be any real drawbacks to using atomictemp, so I'm hoping we can just change it in core. Differential Revision: https://phab.mercurial-scm.org/D5274

blackbox: extract _log() function which is called after lastui is resolved This makes sure that self is the solo ui instance used in _log().

blackbox: inline temporary variables which are referenced only once

blackbox: simply update global lastui variable at once

blackbox: consolidate conditions for early return Just pick the lastui only if it is usable.

blackbox: remove redundant check for unassigned repo Since ui._bbvfs is looked through ui._bbrepo, the repo instance should exist if ui._bbvfs isn't None.

tests: fix bytes/str issue I introduced when adding this test # skip-blame just b prefixes for py3 Differential Revision: https://phab.mercurial-scm.org/D5271

shelve: use matcher to restrict prefetch to just the modified files Shelve currently operates by: - make a temp commit - identify all the bases necessary to shelve, put them in the bundle - use exportfile to export the temp commit to the bundle ('file' here means "export to this fd", not "export this file") - remove the temp commit exportfile calls prefetchfiles, and prefetchfiles uses a matcher to restrict what files it's going to prefetch; if it's not provided, it's alwaysmatcher. This means that `hg shelve` in a remotefilelog repo can possibly download the file contents of everything in the repository, even when it doesn't need to. It luckily is restricted to the narrowspec (if there is one), but this is still a lot of downloading that's just unnecessary, especially if there's a "smart" VCS-aware filesystem involved. exportfile is called with exactly one revision to emit, so we're just restricting it to prefetching the files from that revision. The base revisions having separate files should not be a concern since they're handled already; example: commit 10 is draft and modifies foo/a.txt and foo/b.txt commit 11 is draft and modifies foo/a.txt my working directory that I'm shelving modifies foo/b.txt By the time we get to exportfile, commit 10 and 11 are already handled, so the matcher only specifying foo/b.txt does not cause any problems. I verified this by doing an `hg unbundle` on the bundle that shelve produces, and getting the full contents of those commits back out, instead of just the files that were modified in the shelve. Differential Revision: https://phab.mercurial-scm.org/D5268

revlog: automatically read from opened file handles The revlog reading code commonly opens a new file handle for reading on demand. There is support for passing a file handle to revlog.revision(). But it is marked as an internal argument. When revlogs are written, we write() data as it is available. But we don't flush() data until all revisions are written. Putting these two traits together, it is possible for an in-process revlog reader during active writes to trigger the opening of a new file handle on a file with unflushed writes. The reader won't have access to all "available" revlog data (as it hasn't been flushed). And with the introduction of the previous patch, this can lead to the revlog raising an error due to a partial read. I witnessed this behavior when applying changegroup data (via `hg pull`) before issue6006 was fixed via different means. Having this and the previous patch in play would have helped cause errors earlier rather than manifesting as hash verification failures. While this has been a long-standing issue, I believe the relatively new delta computation code has tickled it into being more common. This is because the new delta computation code will compute deltas in more scenarios. This can lead to revlog reading. While the delta computation code is probably supposed to reuse file handles, it appears it isn't doing so in all circumstances. But the issue runs deeper than that. Theoretically, any code can access revision data during revlog writes. It appears we were just getting lucky that it wasn't. (The "add revision callback" passed to addgroup() provides an avenue to do this.) If I changed the revlog's behavior to not cache the full revision text or to clear caches after revision insertion during addgroup(), I was able to produce crashes 100% of the time when writing changelog revisions. This is because changelog's add revision callback attempts to resolve the revision data to access the changed files list. And without the revision's fulltext being cached, we performed a revlog read, which required opening a new file handle. This attempted to read unflushed data, leading to a partial read and a crash. This commit teaches the revlog to store the file handles used for writing multiple revisions during addgroup(). It also teaches the code for resolving a file handle when reading to use these handles, if available. This ensures that *any* reads (regardless of their source) use the active writing file handles, if available. These file handles have access to the unflushed data because they wrote it. This allows reads to complete without issue. Differential Revision: https://phab.mercurial-scm.org/D5267

revlog: detect incomplete revlog reads _readsegment() is supposed to return N bytes of revlog revision data starting at a file offset. Surprisingly, its behavior before this patch never verified that it actually read and returned N bytes! Instead, it would perform the read(), then return whatever data was available. And even more surprisingly, nothing in the call chain appears to have been validating that it received all the data it was expecting. This behavior could lead to partial or incomplete revision chunks being operated on. This could result in e.g. cached deltas being applied against incomplete base revisions. The delta application process would happily perform this operation. Only hash verification would detect the corruption and save us. This commit changes the behavior of raw revlog reading to validate that we actually read() the number of bytes that were requested. We will raise a more specific error faster, rather than possibly have it go undetected or manifest later in the call stack, at delta application or hash verification. Differential Revision: https://phab.mercurial-scm.org/D5266

revlog: use single file handle when de-inlining revlog _getsegmentforrevs() will eventually call into _datareadfp() to resolve a file handle to read revision data. If no file handle is passed into _getsegmentforrevs(), it opens a new one. Explicit is better than implicit. This commit changes _enforceinlinesize() to open a file handle explicitly when converting inline revlogs to split revlogs and to pass this file handle into _getsegmentforrevs(). I haven't measured, but this change should improve performance, as we no longer reopen the revlog for reading for every revision in the revlog when it is converted from inline to split. Instead, we open it at most once and use it for the duration of the operation. That being said, I /think/ the chunk cache may mitigate the number of file opens required. Differential Revision: https://phab.mercurial-scm.org/D5265

store: raise ProgrammingError if unable to decode a storage path Right now, the function magically return False which is dangerous, so let's raise ProgrammingError. Suggested by Augie in D5139. Differential Revision: https://phab.mercurial-scm.org/D5264

tests: document a known failing interaction between narrow and lfs This is one of the two remaining aborts I found looking into issue5794. I've got no idea what's wrong with the hook, since the changes there fixed the other two problems noted in that bug report. It seems like it might go away when the narrow issue is fixed, but let's make sure this doesn't get lost. The stacktrace for the hook seems to indicate that the missing file *is* in ctx: remote: Traceback (most recent call last): remote: File "c:\Users\Matt\projects\hg\hgext\lfs\__init__.py", line 253, in checkrequireslfs remote: if any(f in ctx and match(f) and ctx[f].islfs() for f in ctx.files()): remote: File "c:\Users\Matt\projects\hg\hgext\lfs\__init__.py", line 253, in <genexpr> remote: if any(f in ctx and match(f) and ctx[f].islfs() for f in ctx.files()): remote: File "c:\Users\Matt\projects\hg\hgext\lfs\wrapper.py", line 191, in filectxislfs remote: return _islfs(self.filelog(), self.filenode()) remote: File "c:\Users\Matt\projects\hg\mercurial\context.py", line 631, in filenode remote: return self._filenode remote: File "c:\Users\Matt\projects\hg\mercurial\util.py", line 1528, in __get__ remote: result = self.func(obj) remote: File "c:\Users\Matt\projects\hg\mercurial\context.py", line 579, in _filenode remote: return self._filelog.lookup(self._fileid) remote: File "c:\Users\Matt\projects\hg\mercurial\filelog.py", line 68, in lookup remote: self._revlog.indexfile) remote: File "c:\Users\Matt\projects\hg\mercurial\utils\storageutil.py", line 218, in fileidlookup remote: raise error.LookupError(fileid, identifier, _('no match found')) remote: LookupError: data/inside2/f.i@f59b4e021835: no match found

logtoprocess: drop support for ui.log() call with invalid msg arguments (BC) Before, the logtoprocess extension put a formatted message into $MSG1, and its arguments to $MSG2... If the specified arguments couldn't be formatted because of a caller bug, an unformatted message was passed in to $MSG1 instead of exploding. This behavior doesn't make sense. Since I'm planning to formalize the ui.log() interface such that we'll no longer have to extend the ui class, I want to remove any features not conforming to the ui.log() API. So this patch removes the support for ill-formed arguments, and $MSG{n} (where n > 1) parameters which seems useless as long as the message can be formatted. The $MSG1 variable isn't renamed for the maximum compatibility. In future patches, a formatted msg will be passed to a processlogger object, instead of overriding the ui.log() function. .. bc:: The logtoprocess extension no longer supports invalid ``ui.log()`` arguments. A log message is always formatted and passed in to the ``$MSG1`` environment variable.

py3: byte-stringify inline extension in test-logtoprocess.t

logtoprocess: rewrite dict building in py3-compatible way

logtoprocess: leverage procutil.shellenviron() to stringify variables (BC) This should make the extension more Py3 friendly. The environment variables of the main process are copied to the dict by shellenviron(). .. bc:: Boolean options passed to the logtoprocess extension are now formatted as ``0`` or ``1`` instead of ``None``, ``False``, or ``True``.

templater: check invalid use of list expression properly (issue5920) The error message is still cryptic, but it should be better.

py3: add b suffix to make sure file is opened in bytes mode Differential Revision: https://phab.mercurial-scm.org/D5263

py3: don't use dict.iterkeys() dict.iterkeys() is not present on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5262

py3: use node.hex(h.digest()) instead of h.hexdigest() hashlib.sha1.hexdigest() returns str on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5261

py3: make second argument of fdopen() a str # skip-blame as just r'' prefixes Differential Revision: https://phab.mercurial-scm.org/D5260

py3: fix keyword arguments handling in hgext/remotefilelog/ Keys of kwargs on Python 3 should be strings. This patch fixes them by appending r'' prefixes, and using pycompat.byteskwargs() and pycompat.strkwargs(). Differential Revision: https://phab.mercurial-scm.org/D5259

py3: add __pycache__ to .hgignore Something changed with Python 3 just like million on things. Maybe they should named Python 3 as anaconda or cobra instead of just increasing the version number. This makes test-custom-filters.t pass on Python 3. Differential Revision: https://phab.mercurial-scm.org/D5039

sparse-revlog: stop using a heap to track selected gap Same logic as for 'gapsheap', we don't actually need a heap.

sparse-revlog: stop using a heap to track gaps The heap doesn't bring any performance advantage as we can simply sort the final list. Moreover, the lesser complexity helps a lot when we later implement it in C.

sparse-revlog: fast-path before computing payload size In this fast-path case, we do not need to compute the full delta chain payload. Since it comes with a significant cost, we avoid doing so if possible.

sparse-revlog: drop unused deltainfo parameter from segmentspan We no longer need to deal with slicing logic including uncommitted revision. We drop the associated code.

sparse-revlog: drop unused deltainfo parameter from _slicechunktodensity We no longer need to deal with slicing logic including uncommitted revision. We drop the associated code.

sparse-revlog: skip the span check in the sparse-revlog case This significantly improves the performance on unbundling on smaller repositories. Mercurial: unbundling 1K revisions no-sparse-revlog: 500 ms sparse-revlog-before: 689 ms sparse-revlog-after: 484 ms Pypy: unbundling 1K revisions no-sparse-revlog: 1.242 s sparse-revlog-before: 1.135 s sparse-revlog-after: 0.860 s NetBeans: unbundling 1K revisions no-sparse-revlog: 1.386 s sparse-revlog-before: 2.368 s sparse-revlog-after: 1.191 s Mozilla: unbundling 1K revisions no-sparse-revlog: 3.103 s sparse-revlog-before: 3.367 s sparse-revlog-after: 3.093 s

histedit: import chistedit curses UI from hg-experimental I don't tend to like curses interfaces, but this gets enough use at work that it seems like it's worth bringing into core. This is a minimal import from hg-experimental revision 4c7f33bf5f00, in that I've done the smallest amount of code movement and editing in order to import the functionality. .. feature:: `hg histedit` will now present a curses UI if curses is available and `ui.interface` or `ui.interface.histedit` is set to `curses`. Differential Revision: https://phab.mercurial-scm.org/D5146

manifest: perform cheap checks before potentially allocating memory Differential Revision: https://phab.mercurial-scm.org/D5258

manifest: also reject obviously-too-short lines when parsing lines Differential Revision: https://phab.mercurial-scm.org/D5257

manifest: make sure there's a filename before bothering to look for newline There's no valid manifest that would have no characters before the NUL byte on a line, and this fixes some erratic timeouts in the fuzzer. Differential Revision: https://phab.mercurial-scm.org/D5256

revlog: replace PyInt_AS_LONG with a more portable helper function PyInt_AS_LONG disappears on Python, and our previous #define was producing some problems on Python 3. Let's give up and make an inline helper function that makes this more sane. Differential Revision: https://phab.mercurial-scm.org/D5235

help: document weird behavior of uisetup() While refactoring ui.log() API, it was really annoying that uisetup() is actually an extsetup() the phase 1. Let's document that. I'm planning to add another uisetup() which is called per ui instance, though I can't think of a good name for it.

help: merge section about uisetup() and extsetup() They are technically the same callback, called only once per process. The section name "ui setup" is confusing, so shouldn't be used.

help: add internals.extensions topic I think it's better to include the API overview in core as we now have the internals section in our help system. Retrieved from the wiki, and formatted as reST. Several wiki links are removed since they are invalid in the help. The sections about example extension are removed at all as they seemed too verbose. https://www.mercurial-scm.org/wiki/WritingExtensions

commandserver: send raw progress information to message channel This is pretty basic implementation to support GUI progress bar.

commandserver: make getpass() request distinct from normal prompt Otherwise, GUI clients would have to parse the prompt text.

commandserver: attach prompt default and choices to message These attributes are important to provide a GUI prompt to user.

test-commandserver: clean up quoting and location of dbgui extension This helps embedding '$' in the script.

ui: extract helpers to write message with type or label This provides a 'type' attribute to command-server clients, which seems more solid than relying on 'ui.<type>' labels. In future patches, type='progress' will be added to send raw progress information.

commandserver: add experimental option to use separate message channel This is loosely based on the idea of the TortoiseHg's pipeui extension, which attaches ui.label to message text so the command-server client can capture prompt text, for example. https://bitbucket.org/tortoisehg/thg/src/4.7.2/tortoisehg/util/pipeui.py I was thinking that this functionality could be generalized to templating, but changed mind as doing template stuff would be unnecessarily complex. It's merely a status message, a simple serialization option should suffice. Since this slightly changes the command-server protocol, it's gated by a config knob. If the config is enabled, and if it's supported by the server, "message-encoding: <name>" is advertised so the client can stop parsing 'o'/'e' channel data and read encoded messages from the 'm' channel. As we might add new message encodings in future releases, client can specify a list of encoding names in preferred order. This patch includes 'cbor' encoding as example. Perhaps, 'json' should be supported as well.

commandserver: fix reference before assignment error in pipeservice cleanup Spotted by the next patch.

dispatch: pass around ui.fmsg channel This will be set by the command server. See the next patch.

test-subrepo: document why share magically works even if subrepos are missing I was confused how it's working while reviewing fb490d798be0, "share: reload repo after adjusting it in postshare()."

packaging: add Fedora 29 target Differential Revision: https://phab.mercurial-scm.org/D5254