arbitraryfilecontext: skip the cmp fast path if any side is a symlink `filecmp` follows symlinks by default, which a `filectx.cmp()` call should not be doing as it should only compare the requested entry. After this patch, only the contexts' data are compared, which is the correct contract. This is a corrected version of D1122. Differential Revision: https://phab.mercurial-scm.org/D1165

test-clang-format: new test to verify that files stay clang-formatted For now all .c and .h files are blacklisted. As they become clang-formatted, we'll remove them from the blacklist,and then this test will produce output if there are diffs. Differential Revision: https://phab.mercurial-scm.org/D1133

context: audit paths before clearing unknown files and dirs Fix regression introduced in D785. In some circumstances, context.clearunknown can be called before the path is audited. Audit the path before deleting any conflicting files. Differential Revision: https://phab.mercurial-scm.org/D1157

tests: add test demonstrating regression in path audit D785 regressed behavior in path auditing: files can be deleted if they have a path that conflicts with a filename from a malicious remote or bundle. This test demonstrates the problem - the file should not have been deleted. Differential Revision: https://phab.mercurial-scm.org/D1156

configitems: move rebase config into core The shelve extensions import and call rebase content without loading the extension. This is problematic as the config items rebase uses are not declared and the default value are not set, etc... The shelve extension should be using core utilities only and the necessary bit should be moved from rebase into core. In the meantime, I'm taking a small step to get config registration completed with minimal overhead. The rebase extension is shipped with core so registering its config option within core is not a big issue. This is the last step needed before we can install a warning that enforces all config to be registered.

eol: ensure the eol extensions is loaded when hooks run Similar to the change we did to the 'acl' extensions, we want to make sure the config items are registered before we run the hooks.

acl: make sure the extensions is enabled when the acl-hooks run The acl extension is usually setup through hooks and never directly activated. This means the config item declared in the extension are not loaded. We add the necessary logic to make sure the extensions are loaded before the hook run.

configitems: register the 'web.archivesubrepos' config

configitems: register the 'experimental.effect-flags' config

configitems: register the full 'merge-tools' config and sub-options We register the merge-tools config section (which has an arbitrary base config value) and the possible sub-attribute. The sub-attribute has to be registered first or at the same time otherwise the '.*' item would shadow them. Merge tools could include "." in their name so we can't constrain any more than just ".*".