sharesafe: add functionality to automatically downgrade shares Reasoning is same as previous patch which adds automatic upgrade support. Downgrade is required as if automatic upgrade is enabled, all shares upgrade and then source repository downgrades, shares won't work. We need to downgrade them. Differential Revision: https://phab.mercurial-scm.org/D9680

sharesafe: introduce functionality to automatically upgrade shares In past few months, we have developed a `share-safe` mode for sharing repository in which share source requirements and config values are shared with the shares. To get it rolling, an important task is to get these shares automatically upgraded. We are focusing on an installation where shares are created by scripts and test jobs. It will be difficult to manually upgrade these and we need some functionality to do so automatically. This patch introduces a config option to deal with it. If all of the following conditions are met, we upgrade the share repository automatically: * If the config option is enabled * Share source repository is share-safe enabled * Share is not share-safe enabled * Any command is run in the share Upgrading the share is pretty easy as it involves only editing the requirements file. Differential Revision: https://phab.mercurial-scm.org/D9679

localrepo: move storevfs calculation out of if statement In next patch, we will need this variable in else statement too. So, let's take it out. Differential Revision: https://phab.mercurial-scm.org/D9681

setup: don't import distutils prior to checking FORCE_SETUPTOOLS I've seen warnings about importing distutils before setuptools, although I can't reproduce them at the moment. Differential Revision: https://phab.mercurial-scm.org/D9722

largefiles: remove unused imports This fixes test-check-pyflakes.t Differential Revision: https://phab.mercurial-scm.org/D9747

upgrade: don't perform anything if nothing to do Before this patch, upgrade will process everything, re-clone all revlogs, write requirements file again even there is no change to be made. This patch makes it exit earlier. Differential Revision: https://phab.mercurial-scm.org/D9695

downgrade: if a compression is removed, consider that too For compression format variant, the result of `fromrepo()` and `fromconfig()` is not a boolean and we have to actually equate those to find change. Differential Revision: https://phab.mercurial-scm.org/D9693

engine: prevent a function call for each store file Python function calls are not cheap. Instead of calling the function once for each file in store, we use a dedicated function which filters and yields the required files. Differential Revision: https://phab.mercurial-scm.org/D9673

rhg: use a release-mode executable in tests This allows the rhg build for test-rhg.t to share compiled dependencies such as hg-core with the hg-cpython build for other tests. For context, my wrapper script for the typical edit-compile-test cycle now looks like this: (cd rust && cargo +nightly-2020-10-04 fmt) (cd rust && cargo build --release -p rhg) make --silent local PURE=--rust python test/run-tests.py --local "$@" Differential Revision: https://phab.mercurial-scm.org/D9728

rust: fix file folding map The file folding map, frequently used on macOS, had two issues: * the means for converting it to Python didn't work * a minor typo when copying the python code, where `!=` became `==` With this, the rust code passes all tests on macOS. Test Plan: I'm currently doing a full test run on a case-insensitive file system. If it passes, perhaps we can change the platform check from an error to a warning? Differential Revision: https://phab.mercurial-scm.org/D9671