Valentin Gatien-Baron <valentin.gatienbaron@gmail.com> [Sun, 09 Feb 2020 15:50:36 -0500] rev 44341
help: add a mechanism to change flags' help depending on config
It seems reasonable to have a similar mechanism for the rest of the
help, but no such thing is implemented.
The goal is to make the help of commands clearer in the presence of
significant default changes, like tweakdefaults or with company-wide
hgrcs. In these cases, a user looking at the help of a command doesn't
exactly know what his hgrc is doing.
Apply to this to the --git option of commands that display diffs, as
this option in particular causes confusion for some reason.
Differential Revision: https://phab.mercurial-scm.org/D8100
Matt Harbison <matt_harbison@yahoo.com> [Sat, 08 Feb 2020 23:39:55 -0500] rev 44340
lfs: use str for the open() mode when opening a blob for py3
The other fix for this was to leave the mode as bytes, and import
`pycompat.open()` like a bunch of other modules do. But I think it's confusing
to still use bytes at the python boundary, and obviously error prone. Grepping
for ` open\(.+, ['"][a-z]+['"]\)` and ` open\(.+, b['"][a-z]+['"]\)` outside of
`tests`, there are 51 and 87 uses respectively, so it's not like this is a rare
direct usage.
Differential Revision: https://phab.mercurial-scm.org/D8099
Raphaël Gomès <rgomes@octobus.net> [Thu, 30 Jan 2020 14:57:02 +0100] rev 44339
rust-dirstatemap: cache non normal and other parent set
Performance of `hg update` was significantly worse since the introduction of
the Rust `dirstatemap`. This regression was noticed by Valentin Gatien-Baron
when working on a large repository, as it goes unnoticed for smaller
repositories like Mercurial itself.
This fix introduces the same getter/setter mechanism at `hg-core` level as
for `set/get_dirs`.
While this technique is, as previously discussed, quite suboptimal, it fixes an
important enough problem. Refactoring `hg-core` to use the typestate
pattern could be a good approach to improving code quality in a future patch.
Differential Revision: https://phab.mercurial-scm.org/D8048
Valentin Gatien-Baron <vgatien-baron@janestreet.com> [Fri, 07 Feb 2020 16:01:32 -0500] rev 44338
tags: behave better if a tags cache entry is partially written
This is done by discarding any partial cache entry, instead of
filling the partial cache entry with 0xff before.
Differential Revision: https://phab.mercurial-scm.org/D8095
Valentin Gatien-Baron <vgatien-baron@janestreet.com> [Fri, 07 Feb 2020 15:55:26 -0500] rev 44337
tags: show how hg behaves if a tags cache entry is truncated
I'm seeing an error of this form in production on the order of once a
month. I'm not sure how it happens, but I suspect interrupting a pull
might result in half written cache entries.
Differential Revision: https://phab.mercurial-scm.org/D8094
Valentin Gatien-Baron <vgatien-baron@janestreet.com> [Fri, 07 Feb 2020 13:54:09 -0500] rev 44336
tags: add a debug command to display .hg/cache/hgtagsfnodes1
Differential Revision: https://phab.mercurial-scm.org/D8093
Valentin Gatien-Baron <valentin.gatienbaron@gmail.com> [Sat, 08 Feb 2020 10:22:47 -0500] rev 44335
purge: add -i flag to delete ignored files instead of untracked files
It's convenient for deleting build artifacts. Using --all instead
would delete other things too.
Differential Revision: https://phab.mercurial-scm.org/D8096
Matt Harbison <matt_harbison@yahoo.com> [Thu, 30 Jan 2020 19:50:43 -0500] rev 44334
pyoxidizer: use `legacy_windows_stdio` on Windows
The C executable sets this too, otherwise no output shows up (when paging?).
There is also `legacy_windows_fs_encoding`, but I'm not setting that for now
because the C executable doesn't either.
Differential Revision: https://phab.mercurial-scm.org/D8053
Augie Fackler <augie@google.com> [Wed, 05 Feb 2020 17:12:39 -0500] rev 44333
merge: use manifestdict.walk() instead of manifestdict.matches()
As with other patches in this series, this avoids making a
potentially-expensive copy of a manifest.
Differential Revision: https://phab.mercurial-scm.org/D8084
Augie Fackler <augie@google.com> [Wed, 05 Feb 2020 16:58:50 -0500] rev 44332
manifest: rewrite filesnotin to not make superfluous manifest copies
This also skips using diff() when all we care about is the filenames. I'm
expecting the built in set logic to be plenty fast. For really large manifests
with a matcher in play this should copy substantially less data around.
Differential Revision: https://phab.mercurial-scm.org/D8082
Pulkit Goyal <7895pulkit@gmail.com> [Sat, 08 Feb 2020 03:13:45 +0530] rev 44331
merge with stable
Augie Fackler <augie@google.com> [Thu, 06 Feb 2020 16:55:39 -0500] rev 44330
archival: use walk() instead of matches() on manifest
All we care about is the filepaths, so this avoids a pointless copy of the
manifest that we only used to extract matching filenames.
Differential Revision: https://phab.mercurial-scm.org/D8090
Raphaël Gomès <rgomes@octobus.net> [Fri, 24 Jan 2020 11:10:07 +0100] rev 44329
rust-dirs-multiset: improve temporary error message
While we wait on a future patch that could verify that the paths passed to
`DirsMultiset` have been audited, we still need to handle this error.
This patch makes it easier to bubble up and makes the error clearer.
Also, this patch introduces the `subslice_index` function that could be useful
for other - albeit niche - purposes.
Differential Revision: https://phab.mercurial-scm.org/D7921
Matt Harbison <matt_harbison@yahoo.com> [Wed, 22 Jan 2020 12:11:35 -0500] rev 44328
exchange: check the `ui.clonebundleprefers` form while processing (issue6257)
Otherwise the clone command will emit a long stacktrace if there is no `=`
character.
Differential Revision: https://phab.mercurial-scm.org/D7969
Pierre-Yves David <pierre-yves.david@octobus.net> [Fri, 13 Dec 2019 16:49:05 +0100] rev 44327
copies: add a new test dedicated to testing chain of changeset with merge
The copies test we currently have usually focus on simple case that do not dive
too much into longer chains involving merges. This new test file focus on
extensive testing of these case to validate their behavior and make sure the
various copies algorithm have the same behavior.
And… actually these test are currently broken for the changeset centric
algorithm since 99ebde4fec99, but it went undetected because these case were not
tested.
Differential Revision: https://phab.mercurial-scm.org/D8078
Joerg Sonnenberger <joerg@bec.de> [Wed, 18 Sep 2019 06:07:09 +0200] rev 44326
hgext: initial version of fastexport extension
Differential Revision: https://phab.mercurial-scm.org/D7733
Julien Cristau <jcristau@mozilla.com> [Fri, 07 Feb 2020 15:55:21 +0100] rev 44325
hghave: cache the result of gethgversion
hghave --test-features calls it 90 times, each one calling hg --version
which takes a tenth of a second on my workstation, adding up to about
10s win on test-hghave.t.
Fixes https://bugs.debian.org/939756
Differential Revision: https://phab.mercurial-scm.org/D8092
Martin von Zweigbergk <martinvonz@google.com> [Fri, 24 Jan 2020 14:11:43 -0800] rev 44324
clean: delete obsolete unlinking of .hg/graftstate
The responsibility for clearing it is now in
`cmdutil.clearunfinished()`, so we shouldn't have to unlink it in
`hg.clean()`.
Differential Revision: https://phab.mercurial-scm.org/D7992
Martin von Zweigbergk <martinvonz@google.com> [Tue, 04 Feb 2020 10:16:30 -0800] rev 44323
copies: avoid filtering by short-circuit dirstate-only copies earlier
The call to `y.ancestor(x)` triggered repo filtering, which we'd like
to avoid in the simple `hg status --copies` case.
Differential Revision: https://phab.mercurial-scm.org/D8071
Martin von Zweigbergk <martinvonz@google.com> [Tue, 04 Feb 2020 10:14:44 -0800] rev 44322
tests: add test showing that repo filter is calculated for `hg st --copies`
Differential Revision: https://phab.mercurial-scm.org/D8070
Matt Harbison <matt_harbison@yahoo.com> [Tue, 21 Jan 2020 11:40:15 -0500] rev 44321
lfs: enable workers by default
With the stall issue seemingly fixed, there's no reason not to use workers. The
setting is left for now to keep the test output deterministic, and in case other
issues come up. If none do, this can be converted to a developer setting for
usage with the tests.
Differential Revision: https://phab.mercurial-scm.org/D7963
Matt Harbison <matt_harbison@yahoo.com> [Tue, 21 Jan 2020 11:32:33 -0500] rev 44320
lfs: fix the stall and corruption issue when concurrently uploading blobs
We've avoided the issue up to this point by gating worker usage with an
experimental config. See 10e62d5efa73, and the thread linked there for some of
the initial diagnosis, but essentially some data was being read from the blob
before an error occurred and `keepalive` retried, but didn't rewind the file
pointer. So the leading data was lost from the blob on the server, and the
connection stalled, trying to send more data than available.
In trying to recreate this, I was unable to do so uploading from Windows to
CentOS 7. But it reproduced every time going from CentOS 7 to another CentOS 7
over https.
I found recent fixes in the FaceBook repo to address this[1][2]. The commit
message for the first is:
The KeepAlive HTTP implementation is bugged in it's retry logic, it supports
reading from a file pointer, but doesn't support rewinding of the seek cursor
when it performs a retry. So it can happen that an upload fails for whatever
reason and will then 'hang' on the retry event.
The sequence of events that get triggered are:
- Upload file A, goes OK. Keep-Alive caches connection.
- Upload file B, fails due to (for example) failing Keep-Alive, but LFS file
pointer has been consumed for the upload and fd has been closed.
- Retry for file B starts, sets the Content-Length properly to the expected
file size, but since file pointer has been consumed no data will be uploaded,
causing the server to wait for the uploaded data until either client or
server reaches a timeout, making it seem as our mercurial process hangs.
This is just a stop-gap measure to prevent this behavior from blocking Mercurial
(LFS has retry logic). A proper solutions need to be build on top of this
stop-gap measure: for upload from file pointers, we should support fseek() on
the interface. Since we expect to consume the whole file always anyways, this
should be safe. This way we can seek back to the beginning on a retry.
I ported those two patches, and it works. But I see that `url._sendfile()` does
a rewind on `httpsendfile` objects[3], so maybe it's better to keep this all in
one place and avoid a second seek. We may still want the first FaceBook patch
as extra protection for this problem in general. The other two uses of
`httpsendfile` are in the wire protocol to upload bundles, and to upload
largefiles. Neither of these appear to use a worker, and I'm not sure why
workers seem to trigger this, or if this could have happened without a worker.
Since `httpsendfile` already has a `close()` method, that is dropped. That
class also explicitly says there's no `__len__` attribute, so that is removed
too. The override for `read()` is necessary to avoid the progressbar usage per
file.
[1] https://github.com/facebookexperimental/eden/commit/c350d6536d90c044c837abdd3675185644481469
[2] https://github.com/facebookexperimental/eden/commit/77f0d3fd0415e81b63e317e457af9c55c46103ee
[3] https://www.mercurial-scm.org/repo/hg/file/5.2.2/mercurial/url.py#l176
Differential Revision: https://phab.mercurial-scm.org/D7962
Matt Harbison <matt_harbison@yahoo.com> [Tue, 21 Jan 2020 10:34:15 -0500] rev 44319
lfs: add a method to the local blobstore to convert OIDs to file paths
This is less ugly than passing an open callback to the `httpsendfile`
constuctor.
Differential Revision: https://phab.mercurial-scm.org/D7961
Martin von Zweigbergk <martinvonz@google.com> [Wed, 15 Jan 2020 14:47:38 -0800] rev 44318
merge: introduce a revert_to() for that use-case
In the same vein as the previous patch.
Differential Revision: https://phab.mercurial-scm.org/D7901
Martin von Zweigbergk <martinvonz@google.com> [Wed, 15 Jan 2020 15:30:25 -0800] rev 44317
merge: introduce a clean_update() for that use-case
I find it hard to understand what value to pass for all the arguments
to `merge.update()`. I would like to introduce functions that are more
specific to each use-case. We already have `graft()`. This patch
introduces a `clean_update()` and uses it in some places to show that
it works.
Differential Revision: https://phab.mercurial-scm.org/D7902
Augie Fackler <augie@google.com> [Wed, 05 Feb 2020 16:16:15 -0500] rev 44316
manifest: fix _very_ subtle bug with exact matchers passed to walk()
Prior to this fix, manifestdict.walk() with an exact matcher would blindly
list the files in the matcher, even if they weren't in the manifest. This was
exposed by my next patch where I rewrite filesnotin() to use walk() instead of
matches().
Differential Revision: https://phab.mercurial-scm.org/D8081
Raphaël Gomès <rgomes@octobus.net> [Tue, 14 Jan 2020 17:08:45 +0100] rev 44315
rust-utils: add `Escaped` trait
This will be used as a general interface for displaying things to the user.
The upcoming `IncludeMatcher` will use it to store its patterns in a
user-displayable string.
Differential Revision: https://phab.mercurial-scm.org/D7870
Raphaël Gomès <rgomes@octobus.net> [Tue, 14 Jan 2020 17:04:32 +0100] rev 44314
rust-dirs-multiset: add `DirsChildrenMultiset`
In a future patch, this structure will be needed to store information needed by
the (also upcoming) `IgnoreMatcher`.
Differential Revision: https://phab.mercurial-scm.org/D7869
Raphaël Gomès <rgomes@octobus.net> [Tue, 14 Jan 2020 16:50:35 +0100] rev 44313
rust-hg-path: add useful methods to `HgPath`
This changeset introduces the use of the `pretty_assertions` crate for easier
to read test output.
Differential Revision: https://phab.mercurial-scm.org/D7867
Raphaël Gomès <rgomes@octobus.net> [Wed, 05 Feb 2020 17:05:37 +0100] rev 44312
rust-pathauditor: add Rust implementation of the `pathauditor`
It does not offer the same flexibility as the Python implementation, but
should check incoming paths just as well.
Differential Revision: https://phab.mercurial-scm.org/D7866
Pulkit Goyal <7895pulkit@gmail.com> [Wed, 22 Jan 2020 03:17:06 +0530] rev 44311
py3: catch AttributeError too with ImportError
Looks like py3 raises AttributeError instead of ImportError. This is caught on
windows.
Differential Revision: https://phab.mercurial-scm.org/D7965
Augie Fackler <augie@google.com> [Wed, 05 Feb 2020 15:15:18 -0500] rev 44310
context: use manifest.walk() instead of manifest.match() to get file list
The former doesn't create a whole extra manifest in order to produce the
matching file list, which is all we actually cared about here. Sigh.
Differential Revision: https://phab.mercurial-scm.org/D8080
Augie Fackler <augie@google.com> [Wed, 05 Feb 2020 15:01:22 -0500] rev 44309
manifest: remove `.new()` from the interface
Nothing used it.
Differential Revision: https://phab.mercurial-scm.org/D8079
Kyle Lippincott <spectral@google.com> [Wed, 29 Jan 2020 13:39:50 -0800] rev 44308
chg: force-set LC_CTYPE on server start to actual value from the environment
Python 3.7+ will "coerce" the LC_CTYPE variable in many instances, and this can
cause issues with chg being able to start up. D7550 attempted to fix this, but a
combination of a misreading of the way that python3.7 does the coercion and an
untested state (LC_CTYPE being set to an invalid value) meant that this was
still not quite working.
This change will cause differences between chg and hg: hg will have the LC_CTYPE
environment variable coerced, while chg will not. This is unlikely to cause any
detectable behavior differences in what Mercurial itself outputs, but it does
have two known effects:
- When using hg, the coerced LC_CTYPE will be passed to subprocesses, even
non-python ones. Using chg will remove the coercion, and this will not
happen. This is arguably more correct behavior on chg's part.
- On macOS, if you set your region to Brazil but your language to English,
this isn't representable in locale strings, so macOS sets LC_CTYPE=UTF-8. If
this value is passed along when ssh'ing to a non-macOS machine, some
functions (such as locale.setlocale()) may raise an exception due to an
unsupported locale setting. This is most easily encountered when doing an
interactive commit/split/etc. when using ui.interface=curses.
Differential Revision: https://phab.mercurial-scm.org/D8039
Pierre-Yves David <pierre-yves.david@octobus.net> [Mon, 03 Feb 2020 09:00:05 +0100] rev 44307
perf: fix list formatting in perfindex documentation
Differential Revision: https://phab.mercurial-scm.org/D8067
Pierre-Yves David <pierre-yves.david@octobus.net> [Sat, 01 Feb 2020 09:14:36 +0100] rev 44306
test: simplify test-amend.t to avoid race condition
Insted on relying on sleep, we could simply have the editor do the file change.
This remove the reliance on "sleep" and avoid test failing on heavy load
machine.
To test this, I reverted the code change in 5558e3437872 and the test started
failing again.
Differential Revision: https://phab.mercurial-scm.org/D8065
Pierre-Yves David <pierre-yves.david@octobus.net> [Fri, 13 Dec 2019 11:32:36 +0100] rev 44305
test: document test-copy-move-merge.t
Differential Revision: https://phab.mercurial-scm.org/D8077
Augie Fackler <augie@google.com> [Mon, 03 Feb 2020 22:16:36 -0500] rev 44304
manifest: remove optional default= argument on flags(path)
It had only one caller inside manifest.py, and treemanifest was
actually incorrectly implemented. treemanifest is still missing the
fastdelta() method from the interface (and so doesn't yet conform),
but this is at least progress.
Differential Revision: https://phab.mercurial-scm.org/D8069
Augie Fackler <augie@google.com> [Mon, 03 Feb 2020 11:56:02 -0500] rev 44303
resourceutil: blacken
Augie Fackler <augie@google.com> [Mon, 03 Feb 2020 11:51:52 -0500] rev 44302
merge with stable
Martin von Zweigbergk <martinvonz@google.com> [Fri, 31 Jan 2020 10:53:50 -0800] rev 44301
rebase: abort if the user tries to rebase the working copy
I think it's more correct to treat `hg rebase -r 'wdir()' -d foo`
as `hg co -m foo`, but I'm instead making it error out. That's partly
because it's probably what the user wanted (in the case I heard from a
user, they had done `hg rebase -s f` where `f` resolved to `wdir()`)
and partly because I don't want to think about more complicated cases
where the user specifies the working copy together with other commits.
Differential Revision: https://phab.mercurial-scm.org/D8057
Martin von Zweigbergk <martinvonz@google.com> [Fri, 31 Jan 2020 10:41:50 -0800] rev 44300
tests: add tests for rebasing wdir() revision
Differential Revision: https://phab.mercurial-scm.org/D8056
Martin von Zweigbergk <martinvonz@google.com> [Wed, 22 Jan 2020 13:29:26 -0800] rev 44299
merge: when rename was made on both sides, use ancestor as merge base
When both sides of a merge have renamed a file to the same place, we
would treat that as a "both created" action in merge.py. That means
that we'd use an empty diffbase. It seems better to use the copy
source as diffbase. That can be done by simply dropping code that
prevented us from doing that. I think I did it that way in
57203e0210f8 (copies: calculate mergecopies() based on pathcopies(),
2019-04-11) only to preserve the existing behavior. I also suspect it
was just an accident that it behaved that way before that commit.
Note that until fa9ad1da2e77 (merge: start using the per-side copy
dicts, 2020-01-23), it was non-deterministic (depending on iteration
order of the `allsources` set in `copies._fullcopytracing()`) which
source was used in the affected test case in test-rename-merge1.t. We
could easily have fixed that by sorting them, but now we can instead
detect the case (the TODO added in the previous patch).
Differential Revision: https://phab.mercurial-scm.org/D7974
Martin von Zweigbergk <martinvonz@google.com> [Fri, 31 Jan 2020 08:47:32 -0800] rev 44298
absorb: graduate -i flag from experimental
The interactive mode seems to work well. I have previously thought
that `-i` should be what `-e` does, but the current behavior matches
what other `-i` flags do (select a subset of the hunks), so I think
that is what we want.
Differential Revision: https://phab.mercurial-scm.org/D8055
Yuya Nishihara <yuya@tcha.org> [Sat, 25 Jan 2020 17:30:24 +0900] rev 44297
rust-cpython: remove PySharedRefCell and its companion structs
Also updates py_shared_iterator!() documentation accordingly.
Yuya Nishihara <yuya@tcha.org> [Sat, 25 Jan 2020 17:26:23 +0900] rev 44296
rust-cpython: switch to upstreamed version of PySharedRefCell
Our PyLeaked is identical to cpython::UnsafePyLeaked. I've renamed it because
it provides mostly unsafe functions.
Yuya Nishihara <yuya@tcha.org> [Sat, 25 Jan 2020 17:21:06 +0900] rev 44295
rust-cpython: rename inner_shared() to inner()
The "shared" accessor will be automatically generated, and will have the
same name as the data itself.
Yuya Nishihara <yuya@tcha.org> [Fri, 31 Jan 2020 00:08:30 +0900] rev 44294
rust-cpython: use PyList.insert() instead of .insert_item()
Silences the deprecated warning.
https://github.com/dgrunwald/rust-cpython/commit/e8cbe864841714c5555db8c90e057bd11e360c7f
Yuya Nishihara <yuya@tcha.org> [Fri, 31 Jan 2020 00:01:29 +0900] rev 44293
rust-cpython: bump cpython to 0.4 to switch to upstreamed PySharedRef
Yuya Nishihara <yuya@tcha.org> [Thu, 30 Jan 2020 23:57:19 +0900] rev 44292
rust: update dependencies
For no particular reason, but just because I'll bump the rust-cpython version.
Pierre-Yves David <pierre-yves.david@octobus.net> [Fri, 24 Jan 2020 12:50:27 +0100] rev 44291
contrib: a small script to nudge lingering diff
After a discussion on IRC with various reviewers. It seems like a good idea to
have some automatic cleanup of old, inactive diffs.
Here is a small script able to do so. I am preparing to unleash it on our
phabricator instance.
Gregory Szorc <gregory.szorc@gmail.com> [Sun, 26 Jan 2020 16:23:57 -0800] rev 44290
packaging: add support for PyOxidizer
I've successfully built Mercurial on the development tip of
PyOxidizer on Linux and Windows. It mostly "just works" on Linux.
Windows is a bit more finicky.
In-memory resource files are probably not all working correctly
due to bugs in PyOxidizer's naming of modules. PyOxidizer now
now supports installing files next to the produced binary. (We
do this for templates in the added file.) So a workaround
should be available.
Also, since the last time I submitted support for PyOxidizer,
PyOxidizer gained the ability to auto-generate Rust projects
to build executables. So we don't need to worry about vendoring
any Rust code to initially support PyOxidizer. However, at some
point we will likely want to write our own command line driver
that embeds a Python interpreter via PyOxidizer so we can run
Rust code outside the confines of a Python interpreter. But that
will be a follow-up.
I would also like to add packaging.py CLI commands to build
PyOxidizer distributions. This can come later, if ever.
PyOxidizer's new "targets" feature makes it really easy to define
packaging tasks in its Starlark configuration file. While not
much is implemented yet, eventually we should be able to produce
MSIs, etc using a `pyoxidizer build` one-liner. We'll get there...
Differential Revision: https://phab.mercurial-scm.org/D7450
Martin von Zweigbergk <martinvonz@google.com> [Wed, 29 Jan 2020 11:30:16 -0800] rev 44289
mergestate: add accessors for local and other nodeid, not just contexts
The mergestate can contain invalid nodeids. In that case,
`mergestate.localctx` or `mergestate.otherctx` will fail. This patch
provides a way of accessing the nodeid without failing in such cases.
Differential Revision: https://phab.mercurial-scm.org/D8040
Martin von Zweigbergk <martinvonz@google.com> [Wed, 15 Jan 2020 22:24:16 -0800] rev 44288
rebase: define base in only place in defineparents()
Just a little refactoring to prepare for the next patch.
Differential Revision: https://phab.mercurial-scm.org/D7906
Martin von Zweigbergk <martinvonz@google.com> [Fri, 20 Dec 2019 16:16:57 -0800] rev 44287
tests: use full `uncommit` command name in tests
I'm about to add a `hg uncopy`, so the `hg unc` we used for `hg
uncommit` would become ambiguous.
Differential Revision: https://phab.mercurial-scm.org/D8028
Martin von Zweigbergk <martinvonz@google.com> [Tue, 28 Jan 2020 14:53:23 -0800] rev 44286
graft: default `base` argument to common case of `ctx.p1()`
I also updated the callers that wanted that, partly to simplify and
partly to show that it works.
Differential Revision: https://phab.mercurial-scm.org/D8027
Martin von Zweigbergk <martinvonz@google.com> [Fri, 10 Jan 2020 13:12:24 -0800] rev 44285
graft: let caller pass in overlayworkingctx to merge.graft()
Passing in a different `wctx` than `repo[None]` is useful because it
allows the caller to decide to not touch the working directory.
Differential Revision: https://phab.mercurial-scm.org/D8026
Martin von Zweigbergk <martinvonz@google.com> [Wed, 29 Jan 2020 23:14:31 -0800] rev 44284
copies: fix crash when copy source is not in graft base
Differential Revision: https://phab.mercurial-scm.org/D8046
Martin von Zweigbergk <martinvonz@google.com> [Wed, 29 Jan 2020 23:05:02 -0800] rev 44283
tests: add test showing crash when shelving ghosted rename target
When you `hg rename` a file and then delete the rename target, `hg
shelve` will give you a traceback.
Note that the shelve succeeds and the shelve is correct, it's just the
update to the parent that fails (i.e. to the parent of the commit that
was created for the shelve).
This can be squashed into the next commit if the reviewer prefers.
Differential Revision: https://phab.mercurial-scm.org/D8045
Yuya Nishihara <yuya@tcha.org> [Tue, 22 Oct 2019 16:04:34 +0900] rev 44282
rust-cpython: mark all PyLeaked methods as unsafe
Unfortunately, these methods can be abused to obtain the inner 'static
reference. The simplest (pseudo-code) example is:
let leaked: PyLeaked<&'static _> = shared.leak_immutable();
let static_ref: &'static _ = &*leaked.try_borrow(py)?;
// PyLeakedRef::deref() tries to bound the lifetime to itself, but
// the underlying data is a &'static reference, so the returned
// reference can be &'static.
This problem can be easily fixed by coercing the lifetime, but there are
many other ways to achieve that, and there wouldn't be a generic solution:
let leaked: PyLeaked<&'static [_]> = shared.leak_immutable();
let leaked_iter: PyLeaked<slice::Iter<'static, _>>
= unsafe { leaked.map(|v| v.iter()) };
let static_slice: &'static [_] = leaked_iter.try_borrow(py)?.as_slice();
So basically I failed to design the safe borrowing interface. Maybe we'll
instead have to add much more restricted interface on top of the unsafe
PyLeaked methods? For instance, Iterator::next() could be implemented if
its Item type is not &'a (where 'a may be cheated.)
Anyway, this seems not an easy issue, so it's probably better to leave the
current interface as unsafe, and get broader comments while upstreaming this
feature.
Yuya Nishihara <yuya@tcha.org> [Sat, 19 Oct 2019 17:01:28 +0900] rev 44281
rust-cpython: make PySharedRef::try_borrow_mut() return BorrowMutError
As I said, it shouldn't be an error of Python layer, but is something like
a coding error. Returning BorrowMutError makes more sense.
There's a weird hack to propagate the borrow-by-leaked state to RefCell
to obtain BorrowMutError. If we don't like it, maybe we can add our own
BorrowMutError.
Yuya Nishihara <yuya@tcha.org> [Sat, 19 Oct 2019 16:48:34 +0900] rev 44280
rust-cpython: inline PySharedState::leak_immutable() and PyLeaked::new()
For the same reason as the previous patch. The unsafe stuff can be better
documented if these functions are inlined.
Yuya Nishihara <yuya@tcha.org> [Sat, 19 Oct 2019 16:34:02 +0900] rev 44279
rust-cpython: inline PySharedState::try_borrow_mut()
Since the core borrowing/leaking logic has been moved to PySharedRef* and
PyLeaked*, it doesn't make sense that PySharedState had a function named
"try_borrow_mut". Let's turn it into a pure data struct.
Yuya Nishihara <yuya@tcha.org> [Sat, 12 Oct 2019 23:34:05 +0900] rev 44278
rust-cpython: add panicking version of borrow_mut() and use it
The original borrow_mut() is renamed to try_borrow_mut().
Since leak_immutable() no longer incref the borrow count, the caller should
know if the underlying value is borrowed or not. No Python world is involved.
That's why we can simply use the panicking borrow_mut().