storageutil: match node length with repository

dirstate: enforce holding the lock while doing any changes This seems like a sensible sanity check. This already caught the issue in largefile. This will catch more issue when we start using similar context manager for operation other than the parent changes.

largefile: make sure we hold the lock when updating the second dirstate The largefile extension uses a second dirstate file (and object) to track some states. In some situations, it is lazily updated when needed. These operations might not have the lock taken. This means they might conflict and race with other ongoing operations. So we now take the lock to do these operations. This was caught by the next commit.

dirstate: rename `@requires_no_parents_change` too This match the rename of the context manager.

dirstate: rename `@requires_parents_change` to `@requires_changing_parents` This match the rename of the context manager.

dirstate: write dirstate on successful exit of changing_parents context This is the first step toward having more sensible and predicatable write patterns for the dirstate. Having better write/rollback patterns will greatly reduce and clarify the needs to backup the dirstate.

dirstate: rename parentchange to changing_parents Since the new argument breaks the API anyway, we can rename it to a better name. The previous name `parentchange` might be seen as something active, a function that would directly change the parents, however this is just a context manager to frame the operation that will change the parents and adjust the dirstate content accordingly. In addition, the future sister method that will be about changes to tracking and files would have a hard time fitting in the same naming scheme in a clear way. The new naming uses a clear prefix will make it more distinct from other dirstate methods and easier to extend with other similar contexts.

dirstate: pass the repo to the `changeparent` method If we want the context to be responsible for writing (and we want it), we need to have access to a localrepository object. So we now requires a localrepository object as an argument to this context manager.

dirstate: warn about non-explicitly rolledback parent-change Now that the invalidation is dealt with by the context manager itself, we should no longer need this in the unlocking code. We start with issuing a warning if this is the case before actually dropping this code later.

dirstate: invalidate changes when parent-change fails When an error occurs during changing parents, we should invalidate all dirstate modifications and reload the dirstate. This is currently done by a `unlock` callback on the `wlock`. To fix this anomaly, we start dealing with the error directly in the context manager and its potential nesting. The "hard" part is to make sure that, when the parent-change context are nested, we and higher level nesting do not continue to use the invalidated dirstate. We introduce dedicated code to enforce that.

setup: Ensure target directory exists with building rust extension When the rust extension is the first to be build, the target directory may not exist so the copy fails.

filemerge: add union-other-first as internal merge tool See inline documentation for details.

rust-narrow: fix loop that never loops This was caught by `clippy`. I guess the narrow tests leave something to be desired, since this previously only checked the first valid pattern.

rust: use `peek_mut` from the standard lib now that it's stable Just a little cleanup of a TODO found along the way.

hghave: refactor checks for pygments versions using checkvers()

hghave: make different has_pyoxidizer functions have different names There are 3 of them, and them all having the same name triggered code checkers.

tests: pygments 2.14+ highlight whitespace in python code

tests: make sure pygments can detect python script without extension This .t file was failing for me when running run-tests.py with python3.11. Then I tried to run it with python3.10 and it failed anyway, even though it's the default python3 interpreter. But with `python3 ./run-tests.py` it worked fine. And this is what I found while looking at the way pygments lexer checks if a file without extension is likely to be a python script: shebang_matches(text, r'pythonw?(3(\.\d)?)?') Take guess why it doesn't work for python >= 3.10. To work around this issue, we can simply hardcode an "easier" shebang for pygments. This path to python interpreter obviously doesn't need to be accurate, since we're not running this script.

clippy: actually fail if there are any warnings So far, only errors would trip the CI, this makes it so all warnings are elevated to errors, making it a CI fail if any warnings are present. This was the intended behavior, I just missed this when adding clippy.

rust-clippy: fix warning about nested ifs

convert: brz 3.3.0 moved NoSuchFile exception to breezy.transport

revset: the `random` sort should not depend on sys.maxsize (issue6770)

contrib: adjust heptapod CI flavor sizes Our CI currently runs on a number of different runners, some of which are run by Clever Cloud. By setting this environement variable, we're asking for a smaller size runner for our smaller jobs, which puts less load on the Clever Cloud infrastructure, while not affecting our overall pipeline times.

debugshell: allow commands to be specified as a CLI argument Add a `--command` option to `hg debugshell` that allows the user to pass in Python code to evaluate directly from the command line. This was inspired by the `--command` option present in Facebook's Sapling fork of Mercurial, which in turn was inspired by the `-c` option of the Python interpreter itself. It is particularly useful for writing tests, especially for getting visibility into things that otherwise aren't exposed via debug commands.

resourceutil: start using importlib.resources.files() when possible This avoids DeprecationWarnings related to our use of resources.open_binary() on Python 3.11.

tests: fix a typo in test-demandimport.t I guess we figured out why it wasn't lazy.

tests: os module is frozen in Python 3.11 (issue6786)

heptapod-ci: add `clippy` to the CI This linter mostly makes our code more idiomatic, less surprising, has good suggestions and catches bugs. It's widely used in the Rust community and now part of the default toolchain when using `rustup`.