util: implement pop() on lrucachedict This moves __delitem__() to pop() as the requirement is pretty much the same, and reimplement __delitem__() by using pop().

util: add method to peek item in lrucachedict I want a function that doesn't unnecessarily update the internal state of the cache dict after fork().

commandserver: loop over selector events An IPC socket will be waited by the same selector.

commandserver: remove redundant "if True" block

commandserver: extract handler of new socket connection This prepares for adding an IPC socket.

commandserver: pass around option to hook repo instance creation This is necessary to wrap a repo instance so the master process will be notified on repo.close().

py3: stop subscripting socket.error In 3.3 and later, this is now an alias for OSError. I hacked up the server code enough that I was able to trigger the exception handler in server.py from test-http-bundle1.t. Other instances of this either subscript through the `args` member, or reference the errno or strerror attributes. Note that on Windows, the errno value seems to reflect the Winsock error, so the various tests for EPIPE seem like they would always fail. But that seems to be the case in py2 as well.

test: update test-logtoprocess.t to not requires less The test previously assumed that a working pager was present in the test environment. Update it to use the fakepager instead. Differential Revision: https://phab.mercurial-scm.org/D5399

py3: quote several instances of $PYTHON for Windows Python3 lives in Program Files by default. The last remaining unquoted instance is in test-hghave.t. I can't figure out how to quote that, as it either complains: 'c:\\Program' is not recognized as an internal or external command, operable program or batch file. or $TESTTMP.sh: line 22: "C:/Program Files/Python37/python.exe": $ENOENT$

py3: adapt test-largefiles-wireproto.t to python3

py3: byteify test-push-race.t

py3: convert filename to bytes in test-hardlinks.t Windows was complaining about passing str to CreateFileA() in win32.py.

narrow: keep bookmarks temporarily stripped for as long as commits are The narrow extension also has support for shallowness and for inserting older commits on pull. It works by temporarily stripping newer commits, adding the older commits, then re-applying the stripped bundle. The regular Mercurial server uses that when you widen, although it shouldn't be necessary there. Our Google-internal server does it when the user requests an older commit. Our Google-internal tests fail since 7caf632e30c3 (filecache: unimplement __set__() and __delete__() (API), 2018-10-20). I haven't quite understood the problem, but it's related to the way we temporarily hide bookmarks while the commits they point to are stripped. When a transaction is started, Mercurial tries to read various things from the repo for the transaction summary. That leads to computation of hidden commits, which leads to an attempt to find commits pinned by bookmarks. This is the reason we temporarily hide the bookmarks. I think the aforementioned commit makes the restored bookmarks visible earlier than before (which seems like an improvement), so we can no longer incorrectly rely on the repo._bookmarks field being cached too long (IIUC). This patch makes it so we restore the temporarily hidden bookmarks only after the temporary bundle has been re-applied. It also adapts the code to update the repo.__bookmarks field using the pattern described in the aforementioned commit instead of writing directly to the fiels. I have spent many hours trying to understand what was going on here, but I still don't know if this can also happen without our custom server. So this patch unfortunately does not add any tests; I have only been able to test the fix using our Google-internal tests. Differential Revision: https://phab.mercurial-scm.org/D5398

narrow: drop obsolete support for old Mercurial Not needed since narrow is shipped with core. Differential Revision: https://phab.mercurial-scm.org/D5397

tests: test that narrow preserves bookmarks on widen When widening inserts older commits in the changelog, we have to preserve bookmarks so they are not removed by the call to repair.strip() we temporarily do. We didn't have any tests for that before. Differential Revision: https://phab.mercurial-scm.org/D5396

rebase: clarify that commits that become empty are skipped Our message just said that it created no changes, but we didn't explicitly say that that meant that the the commit was not rebased. It also wasn't clear why it created no changes, so this patch also clarifies that that was because the changes were already in the destination. Differential Revision: https://phab.mercurial-scm.org/D5395

rebase: format commit in usual way when explaining that it became empty We use the _ctxdesc() for other similar messages, so it seems we should use it here too. Differential Revision: https://phab.mercurial-scm.org/D5394

rust: propagate error of index_get_parents() properly Before, rustla_contains() would return 0 on error, and the exception would be cleared or noticed somewhere else. We need to propagate the error from AncestorsIterator up to the FFI surface.

rust: look up HgRevlogIndex_GetParents() from symbol table And removes the unused index_get_parents_checked() function. I expect the Index struct will be turned into a pyobject type, though I haven't written any PoC-level patches yet.

revlog: add public CPython function to get parent revisions Since this is a public function, it validates the input revision, and supports nullrev. index_get_parents_checked() will be replaced by this function.

revlog: rename indexType to HgRevlogIndex_Type as it's a global symbol It follows the CPython naming convention, but uses Hg instead of Py.

revlog: export symbol of indexType The idea is to wrap the index object with rust-cpython. I haven't tried it, but it should be doable. We'll probably need a better interface than raw function pointers to do more in Rust.

setup: fix path of rust source dependencies Appears that they were screwed up while moving the source files around. Since rust-direct-ffi sources are automatically added to the depends list, we only need to list hg-core sources.

rebase: remove now-unnecessary arguments to _abort() Since _abort() is now an instance method, we don't need to pass state that's available on "self". Differential Revision: https://phab.mercurial-scm.org/D5393

rebase: move abort() onto rebaseruntime The function depends on a lot of the state of rebaseruntime, so it makes sense for it to be an instance method. This will let us remove many of the arguments to the method. That will be done in a later patch. Differential Revision: https://phab.mercurial-scm.org/D5392

cleanupnodes: trust caller when "moves" is not None If "moves" (indicating how to move bookmarks) is None, we fill it out based on "replacements" (indicating which obsmarkers to add). If "moves" is not None, we would still add items based on "replacements". This makes it impossible to pass "moves={}" and not move bookmarks, which surprised me. The only caller that currently passes a value for "moves" was the rebase extension and there we were already adding bookmark moves corresponding to obsmarker additions, so it should not be impacted. Differential Revision: https://phab.mercurial-scm.org/D5391

shelve: change transaction description from "commit" to "shelve" "commit" was probably a copy&paste mistake. Differential Revision: https://phab.mercurial-scm.org/D5390

shelve: drop unnecessary backup of dirstate for phase-based case Regular shelve has a hack using an uncommitted transaction that's then aborted at the end of the operation. It preserves the dirstate across the abort, however, by saving a backup copy of it. Phase-based shelve instead commits the transaction, so the hack shouldn't be necessary there. Differential Revision: https://phab.mercurial-scm.org/D5389

tests: split test-shelve.t in two test-shelve.t dominated run time for all shelve tests. Before: # Ran 9 tests, 1 skipped, 0 failed. real 0m43.568s user 2m15.822s sys 0m40.857s After: # Ran 11 tests, 1 skipped, 0 failed. real 0m24.574s user 2m21.354s sys 0m40.435s Differential Revision: https://phab.mercurial-scm.org/D5388

remotefilelog: rely on progress helper for keeping track of position The progress helper class keeps track of its current position, so we don't need a "count" variable for that. Differential Revision: https://phab.mercurial-scm.org/D5386