windows: don’t set `softspace` attribute in `winstdout` Python 2 file objects have the `softspace` attribute (https://docs.python.org/2/library/stdtypes.html#file.softspace), which is used by the print statement to track its internal state. The documentation demands from file-like objects only that the attribute is writable and initialized to 0. Method `file.write()` sets it to 0, but this is not documented. Historically, sys.stdout was replaced by an instance of the `winstdout` class, so it needed to behave exactly the same (the softspace fix was introduced in 705278e70457). Nowadays we don’t replace sys.stdout and don’t use the print statement on `winstdout` instances, so we can safely drop it.

windows: handle file-like objects without isatty() method Copying the function is not nice, but moving around stuff to avoid the circular import didn’t seem to be worth the effort.

exchange: check actually missing revs for obsolete / unstable revs (issue6372) The previous code was using `outgoing.ancestorsof`, which was originally called `outgoing.missingheads` although not containing the missing heads. This confusion was probably the reason why the buggy code was written. The actually outgoing changesets are stored in `outgoing.missing`. By checking all outgoing changesets, we avoid the problem and can show the list of all obsolete or unstable changesets, which is more helpful for the user.

tests: test that push doesn’t complain about unstable changesets if no changes When there’re no outgoing changes, push doesn’t complain about unstable changesets. There is currently a bug (see issue6372) that causes that there is an abort on push when the outgoing changes contain another changeset even if that is not obsolete or unstable. A test case and fix for that is sent in the next patch.

diff: move no-eol text constant to a common location Differential Revision: https://phab.mercurial-scm.org/D8763

revert: fix interactive reverting of end-of-file newline changes The chunk reversal used by `revert -i` in Curses mode was not taking this case into account. Differential Revision: https://phab.mercurial-scm.org/D8762

phabricator: clarify the multiple heads/roots error message for phabsend As pointed out in followup feedback for c1c922391314, it's confusing to say there are multiple items and then only list one. Differential Revision: https://phab.mercurial-scm.org/D8761

error: normalize "unresolved conflicts" error messages with a custom class Differential Revision: https://phab.mercurial-scm.org/D8713

error: unify the error message formats for 'rebase' and 'unshelve' Differential Revision: https://phab.mercurial-scm.org/D8730

debugcommands: create new debugantivirusrunning command This writes the EICAR test file to .hg/cache, in an attempt to trigger an AV scanner's scanning engine. This should let us (in theory) detect some cases when a user's slowness is a result of AV scanning. Differential Revision: https://phab.mercurial-scm.org/D8353

windows: always work around EINVAL in case of broken pipe for stdout / stderr In 29a905fe23ae, I missed the fact that the `winstdout` class works around two unrelated bugs (size limit when writing to consoles and EINVAL in case of broken pipe) and that the latter bug happens even when no console is involved. When writing a test for this, I realized that the same problem applies to stderr, so I applied the workaround for EINVAL to both stdout and stderr. The size limit is worked around in the same case as before (consoles on Windows on Python 2). For that, I changed the `winstdout` class.

tests: make pipes / PTYs non-inheritable in test-stdio.py A following patch requires that to test closing the receiving end of the pipe / PTYs. Even for existing tests, it might be safer to make the lifetime of the pipes / PTYs as short as possible.

util: enhance `nullcontextmanager` to be able to return __enter__ result This makes its functionality and signature equivalent to Python 3.7’s contextlib.nullcontext().

windows: augment docstring of `winstdout` class

discovery: change users of `outgoing.missingheads` to `outgoing.ancestorsof` The attribute `missingheads` was recently renamed to `ancestorsof`, as it, despite the old name, doesn’t contain the missing heads but the changesets that were requested (including ancestors) for the outgoing operation. Changing all the users enables to print a warning if the old name is used. There is a good chance that some of the users are buggy because of the old name. Changing them to use the new name makes it more obvious that they are buggy. All users need to be reviewed for bugs. When sending patches for fixing them, the change will be more obvious without having to explain again and again the discrepancy of the old attribute name and what it actually contained.

discovery: fix docstring of `outgoing` class Also, introduce a more correct name `ancestorsof` for what was named `missingheads` before. For now, we just forward `ancestorsof` to `missingheads` until all users are changed. There were some mistakes in the old docstring / name: * `missingheads` (new name: `ancestorsof`) contains the revs whose ancestors are included in the outgoing operation. It may contain non-head revs and revs which are already on the remote, so the name "missingheads" is wrong in two ways. * `missing` contains only ancestors of `missingheads`, so not *all nodes* present in local but not in remote. * `common` might not contain all common revs, e.g. not some that are not an ancestor of `missingheads`. It seems like the misleading name have fostered an actual bug (issue6372), where `outgoing.missingheads` was used assuming that it contains the heads of the missing changesets.

discovery: weaken claim about returned common heads if ancestorsof are given As the test case shows, the claim is not true in general.

cext: remove unused variables Differential Revision: https://phab.mercurial-scm.org/D8760

phabupdate: allow resigning from revisions Differential Revision: https://phab.mercurial-scm.org/D8756

phabupdate: allow revisions to be commandeered Differential Revision: https://phab.mercurial-scm.org/D8755

phabupdate: allow revisions to be reopened Differential Revision: https://phab.mercurial-scm.org/D8754

phabupdate: allow revisions to be marked "closed" (Yes, the transaction name and final state in the comment here do differ.) Differential Revision: https://phab.mercurial-scm.org/D8753

phabupdate: allows revisions to be marked "request-review" Differential Revision: https://phab.mercurial-scm.org/D8752

phabupdate: allow revisions to be marked with "plan changes" Differential Revision: https://phab.mercurial-scm.org/D8751

status: match category text in the option description The ! category in the main status help text is defined as "missing", so use the same text for the help text of --delete. Differential Revision: https://phab.mercurial-scm.org/D8759

purge: classify as a "working directory management" command in help It seems to me that `hg purge` is clearly a "working directory management" command and not a "repository management" command. The working copy is all that's affected, after all; the repo is not affected at all. Differential Revision: https://phab.mercurial-scm.org/D8757

extensions: make `hg help extensions` list disabled extensions with PyOxidizer `setup.py` has a mechanism for generating a list of bundled extensions and their documenation and putting it in a `hgext/__index__.py` file. That file is then read from `extensions.py`, which makes `hg help extensions` work in py2exe binaries. This patch makes it so `setup.py` produces the `hgext/__index__.py` file also when called by PyOxidizer. Thanks to Matt Harbison for pointing out the existence of `__index__.py`! Differential Revision: https://phab.mercurial-scm.org/D8758

phases: sparsify phaseroots and phasesets As final step of dealing with the holes in the phase numbers, make phaseroots and phasesets both dictionaries indexed by the phase number. Further adjust the interface of the C module by pushing the node to revision mapping down as it is cheaper on the C side to deal with revision numbers. Overall, the patch series improves a no-change "hg up" for my NetBSD test repository from 4.7s to 1.3s. Differential Revision: https://phab.mercurial-scm.org/D8698

extdiff: add some comments in diffrevs() It was not obvious to understand the code so I added some comments. Differential Revision: https://phab.mercurial-scm.org/D8690

extdiff: add comments and minor variable renames diffpatch() Some variable names were now confusing as we refactored the code in a separate function. For example, `node1a` leads to ideas why `1a` and not `1`. The variable storing path to patch file was named as `dirX` instead of `fileX`. Renamed these variables and added couple of comments. Differential Revision: https://phab.mercurial-scm.org/D8689

extdiff: remove unrequired do3way argument to diffpatch() When we are diffing patches, there is no 3 way diff. Differential Revision: https://phab.mercurial-scm.org/D8688

extdiff: refactor logic to diff revs of versions of files Now that code for both cases, diffing patches or files is in separate function, it will be better to refactor them more and understand. Differential Revision: https://phab.mercurial-scm.org/D8687

extdiff: refactor logic which does diff of patches The current extdiff code is hard to understand on first look. Took me few hours to grasp the code. Before adding more things, decided to do some refactoring. Differential Revision: https://phab.mercurial-scm.org/D8686

absorb: make it explicit if empty changeset was created If the config rewrite.empty-successor=skip is set, a message "became empty and was dropped" is shown if the changeset became empty. If the config rewrite.empty-successor=keep is set, absorb may create changesets even if they became empty. It’s probably a good idea to make that explicit. Therefore the message is changed to be a combination of both: "became empty and became ...". Repeating the word "became" is not very elegant. This results from the fact that "became" was and is overloaded to indicate both the change from non-empty to empty and the successor relation. In the combinated message, both meanings are used in one sentence.

absorb: consider rewrite.empty-successor configuration This adds support for the recently added rewrite.empty-successor configuration.

rebase: consider rewrite.empty-successor configuration This adds support for the recently added rewrite.empty-successor configuration.

rewriteutil: add utility to check whether empty successors should be skipped

config: add option to control creation of empty successors during rewrite The default for many history-rewriting commands (e.g. rebase and absorb) is that changesets which would become empty are not created in the target branch. This makes sense if the source branch consists of small fix-up changes. For more advanced workflows that make heavy use of history-editing to create curated patch series, dropping empty changesets is not as important or even undesirable. Some users want to keep the meta-history, e.g. to make finding comments in a code review tool easier or to avoid that divergent bookmarks are created. For that, obsmarkers from the (to-be) empty changeset to the changeset(s) that already made the changes should be added. If a to-be empty changeset is pruned without a successor, adding the obsmarkers is hard because the changeset has to be found within the hidden part of the history. If rebasing in TortoiseHg, it’s easy to miss the fact that the to-be empty changeset was pruned. An empty changeset will function as a reminder that obsmarkers should be added. Martin von Zweigbergk mentioned another advantage. Stripping the successor will de-obsolete the predecessor. If no (empty) successor is created, this won’t be possible. In the future, we may want to consider other behaviors, like e.g. creating the empty successor, but pruning it right away. Therefore this configuration accepts 'skip' and 'keep' instead of being a boolean configuration.

commands: use any() instead of `if a or b or c` Small cleanup for future when we have an option to show configs from shared rc. Differential Revision: https://phab.mercurial-scm.org/D8658

manifest: use the same logic for handling flags in _parse as elsewhere Differential Revision: https://phab.mercurial-scm.org/D8684

manifest: tigher manifest parsing and flag use In the manifest line, flags are put directly after the hash, so the parser has been guessing the presence of flags based on the length of the hash. Replace this assumption by an enumeration of the valid flags and removing them from the hash first as they are distinct input values. Consistently handle the expected 256bit length of the SHA1-replacement in the pure Python parser. Check that setting flags will use one of the blessed values. Extend write logic in the C version to handle 256bit hashes as well. Verify that hashes always have exactly the expected length. Since 1070df141718 we should no longer depend on the old extra-byte hack. Differential Revision: https://phab.mercurial-scm.org/D8679

phases: sparsify phase lists When the internal and archived phase was added, allphase became a large, sparsely populated list. This dramatically increased the number of lookup operations for public relations in `phasecache.phase`. As a first step, define allphases and related lists explicitly to contain only the actual phases. Make phasenames a dictionary and create corresponding dictionaries for mapping phase names back to numbers. Adjust various list to be sparse as well with the exception of phaseroots and phasesets members of phasecache. Keep those as a separate step as it involves changes to the C module. Differential Revision: https://phab.mercurial-scm.org/D8697

phases: updatephases should not skip internal phase Historically, updatephases used to skip the secret phase, but wasn't updated when archived and internal were added. Differential Revision: https://phab.mercurial-scm.org/D8696

repoview: use the phasecache directly to determine mutable revisions This speeds up no-change updates from 1.3s to 0.85s for my NetBSD test repository. Differential Revision: https://phab.mercurial-scm.org/D8670

phases: provide a test and accessor for non-public phase roots This decouples users from the implementation details of the phasecache. Also document a historic artifact about the stored phaseroots. Differential Revision: https://phab.mercurial-scm.org/D8694

hg-core: define a `dirstate_status` `Operation` This is 3/3 in a series of patches to improve dirstate status' code. Following in the footsteps of a46e36b82461, we move the main status functionality to an `Operation`. This will most likely be subject to change in the future (what function signature, what parameters, etc., but we will see when `rhg` gets `hg status` support. Differential Revision: https://phab.mercurial-scm.org/D8663

rust-status: improve documentation and readability This patch is 2/3 in the series to improve the dirstate status code. It adds a number of common type aliases to add more obvious semantics to function signatures, improves/adds documentation where necessary and improves one or two patterns to be more idiomatic. Differential Revision: https://phab.mercurial-scm.org/D8662

rust-status: refactor status into a struct The code for `dirstate/status` has grown too large for comfort, this is the first of three patches that try to improve maintainability. In this patch, refactoring dirstate's status into a struct allows for slimming down function signatures drastically, keeping the mental (and maintenance) burden lower, since pretty much all of them shared a few common arguments. This had the pleasant side-effect of simplifying lifetimes a little. This has no observable impact on performance. The next patch will add/improve documentation and refactor some types. I tried to keep new code down to a minimum in this patch because it's already pretty big. Differential Revision: https://phab.mercurial-scm.org/D8661

tests: avoid "magic" nodeids in test-rebase-legacy.t This helps with readability. Differential Revision: https://phab.mercurial-scm.org/D8735

tests: avoid a "magic" nodeid in test-wireproto-command-lookup.t This helps with readability. Differential Revision: https://phab.mercurial-scm.org/D8734

run-tests: replace '#' with '-' in temp path of repos created for tests If we have multiple cases in a test, that leads us to a temp path of format "<temp-path>-<case1>#<case2>". This leads to hg.parseurl() parsing the path and take part after `#` as a branch name. I encountered this bug while adding support for share-safe case in next patch. Differential Revision: https://phab.mercurial-scm.org/D8647

debugcommands: introduce new debugrequirements command This for now just prints out the list of current requirements. In future this will be helpful in reading requirements from couple of sources, and checking which requirement comes from where. Differential Revision: https://phab.mercurial-scm.org/D8632

scmutil: add writereporequirements() and route requires writing through it In upcoming patches, to implement Share Safe plan we will be introducing requires file in store. We need to route all callers to a single function to check for a share-safe requirement and if present, write requirements to .hg/store/requires instead. After this patch, callers directly calling scmutil.writerequires() are only those where we don't have the repo object, for example when initializing the repository object itself. Differential Revision: https://phab.mercurial-scm.org/D8631

extensions: make `hg nonexistent` not crash with PyOxidizer When running `hg nonexistent`, we try to look for extensions that provide that command. We do that by looking for files in the `hgext.__file__` directory. However, PyOxidizer doesn't provide a `__file__`, so we crash when running with PyOxidizer. We should be able to look for the command in built-in extensions, but we seem to already have code for skipping the scan when running in a frozen binary, so I just modified that code instead. By the way, it also seems like we should be able to search for extensions in the `hgext3rd` module, but we don't do that yet either (before or after this patch). Differential Revision: https://phab.mercurial-scm.org/D8750

procutil: avoid use of deprecated tempfile.mktemp() In the previous version, I used tempfile.mktemp() because it seemed to be the only way to open a file from two processes (the Python documentation says the file backing NamedTemporaryFile can’t be opened a second time on Windows). However, it’s possible when passing the O_TEMPORARY flag to the second open. Source: https://stackoverflow.com/a/15235559/6366251

procutil: make _make_write_all() function private Because this function isn’t meant for general use (e.g., it’s Python 2-only), make in a module-private function by prefixing it with `_`.

dispatch: handle late KeyboardInterrupt occurred in run() User can press Ctrl+C while flushing streams in dispatch.run(). In such case, I think exiting with 255 is better than printing Python traceback and exiting with 1.

dispatch: indent run() function I'll add KeyboardInterrupt handling there.

debuginstall: don't translate encoding messages While Microsoft trained us to read mojibake text, it doesn't make sense to print mojibake messages when debugging the exact issue.

merge with stable