tracked-key: make it possible to upgrade to and downgrade from the feature This seems rather important if we want people to start using it. Differential Revision: https://phab.mercurial-scm.org/D12198

obsolete: don't use os.stat in repo.obsstore.__nonzero__ if it's static HTTP If a repo is accessed via static HTTP, then we obviously can't use os.stat() to just peek at the file size. Let's download the entire file to check its size. Yes, this feels wasteful, but: 1. If we're cloning or pulling a repo from a static HTTP server, we need the contents of the obsstore anyway. 2. Implementing statichttpvfs.stat() that uses HEAD will result in one more request to a static-only HTTP server, which is already slow. Also parsing a response to a HEAD request to construct os.stat_result is pretty hacky. There's also a question of the remote server properly supporting HEAD method and reporting at least file size. 3. Implementing statichttpvfs.stat() that uses GET is pretty much the same thing as we do here, except we can't even cache the response easily, unlike simply accessing obsstore._data, which is @propertycache'd. Importing statichttprepo locally to avoid circular import. See also: 4507bc001365 and commit message of f8f2ecdde4b5. Differential Revision: https://phab.mercurial-scm.org/D12195

filemerge: make `_maketempfiles()` more reusable `_maketempfiles()` is very specialized for its current use. I hope to use it also when creating temporary files for input for tools that do partial conflict resolution. That'll be possible if the function is more generic. Instead of passing in two contexts (for "other" and "base") and an optional path (for "local"), let's pass a single list of files to make backups for. Even if we don't end up using for partial conflict resolution, this is still a simplification (but I do have a WIP patch for partial conflict resolution and it is able to benefit from this). Differential Revision: https://phab.mercurial-scm.org/D12193

filemerge: reduce some duplication in `_maketempfiles()` The two callers of the local `maketempfrompath()` function used the returned file object in the same way. We can reduce duplication by moving that code into the function. Differential Revision: https://phab.mercurial-scm.org/D12192

filemerge: use leverage `util.readfile()` in `_maketempfiles()` Differential Revision: https://phab.mercurial-scm.org/D12191

filemerge: move removal of `.orig` extension on temp file close to context The place where the `.orig` extension is removed in `_maketempfiles()` doesn't make it clear that it's the backup path, which is why we have a comment in the code explaining it. Let's instead move it out of the function and close to where we get it from `backup.path()`, so that becomes clear. Differential Revision: https://phab.mercurial-scm.org/D12190