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

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

hgext: initial version of fastexport extension Differential Revision: https://phab.mercurial-scm.org/D7733

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

resourceutil: blacken

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

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

tests: add test showing that repo filter is calculated for `hg st --copies` Differential Revision: https://phab.mercurial-scm.org/D8070

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

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

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

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

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

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

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

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

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

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

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

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

manifest: remove `.new()` from the interface Nothing used it. Differential Revision: https://phab.mercurial-scm.org/D8079

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

perf: fix list formatting in perfindex documentation Differential Revision: https://phab.mercurial-scm.org/D8067

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

test: document test-copy-move-merge.t Differential Revision: https://phab.mercurial-scm.org/D8077

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

py3: fully fix bundlepart.__repr__ to return str not bytes My previous fix did not fully fix the issue: it would attempt to use %-formatting to combine two strs into a bytes, which won't work. Let's just switch the entire function to operating in strs. This can cause a small output difference that will likely not be noticed since no one noticed that the method wasn't working at all before: if `id` or `type` are not-None, they'll be shown as `b'val'` instead of `val`. Since this is a debugging aid and these strings shouldn't be shown to the user, slightly rough output is most likely fine and it's likely not worthwhile to add the necessary conditionals to marginally improve it. Differential Revision: https://phab.mercurial-scm.org/D8091

heptapod-ci: add a job to test the rust version of Mercurial The rust version of Mercurial is not currently tested by anything else. So it get quite important that developer runs it. Differential Revision: https://phab.mercurial-scm.org/D8017

heptapod-ci: run the --pure test too These are usually rarely run by individual developper because they are slow. However it is important that they stay happy. Differential Revision: https://phab.mercurial-scm.org/D8016

heptapod-ci: run the normal test suite The usual tests should be run too. We skip the "tests-check*.t" one because their are already covered by another Ci step. Differential Revision: https://phab.mercurial-scm.org/D8015