discovery: port _postprocessobsolete() changes from evolve, add tests Let's make this function obsolescence-aware as well. Now we check that revisions are not obsolete first, and only then check that they are going to be common after exchange. The tests make sure that rewriting changesets doesn't confuse head computation. They rely on experimental.single-head-per-branch feature to show that remote correctly sees the expected result (i.e. either aborts the push or allows it to succeed). They are ported from evolve as well. Differential Revision: https://phab.mercurial-scm.org/D12098

branchmap: skip obsolete revisions while computing heads It's time to make this part of core Mercurial obsolescence-aware. Not considering obsolete revisions when computing heads is clearly what Mercurial should do. But there are a couple of small issues: - Let's say tip of the repo is obsolete. There are two ways of finding tiprev for branchcache (both are in use): looking at input data for update() and looking at computed heads after update(). Previously, repo tip would be tiprev of the branchcache. With this patch, an obsolete revision can no longer be tiprev. And depending on what way we use for finding tiprev (input data vs computed heads) we'll get a different result. This is relevant when recomputing cache key from cache contents, and may lead to updating cache for obsolete revisions multiple times (not from scratch, because it still would be considered valid for a subset of revisions in the repo). - If all commits on a branch are obsolete, the branchcache will include that branch, but the list of heads will be empty (that's why there's now `if not heads` when recomputing tiprev/tipnode from cache contents). Having an entry for every branch is currently required for notify extension (and test-notify.t to pass), because notify doesn't handle revsets in its subscription config very well and will throw an error if e.g. a branch doesn't exist. - Cloning static HTTP repos may try to stat() a non-existent obsstore file. The issue is that we now care about obsolescence during clone, but statichttpvfs doesn't implement a stat method, so a regular vfs.stat() is used, and it assumes that file is local and calls os.stat(). During a clone, we're trying to stat() .hg/store/obsstore, but in static HTTP case we provide a literal URL to the obsstore file on the remote as if it were a local file path. On windows it actually results in a failure in test-static-http.t. The first issue is going to be addressed in a series dedicated to making sure branchcache is properly and timely written on disk (it wasn't perfect even before this patch, but there aren't enough tests to demonstrate that). The second issue will be addressed in a future patch for notify extension that will make it not raise an exception if a branch doesn't exist. And the third one was partially addressed in the previous patch in this series and will be properly fixed in a future patch when this series is accepted. filteredhash() grows a keyword argument to make sure that branchcache is also invalidated when there are new obsolete revisions in its repo view. This way the on-disk cache format is unchanged and compatible between versions (although it will obviously be recomputed when switching versions before/after this patch and the repo has obsolete revisions). There's one test that uses plain `hg up` without arguments while updated to a pruned commit. To make this test pass, simply return current working directory parent. Later in this series this code will be replaced by what prune command does: updating to the closest non-obsolete ancestor. Test changes: test-branch-change.t: update branch head and cache update message. The head of default listed in hg heads is changed because revision 2 was rewritten as 7, and 1 is the closest ancestor on the same branch, so it's the head of default now. The cache invalidation message appears now because of the cache hash change, since we're now accounting for obsolete revisions. Here's some context: "served.hidden" repo filter means everything is visible (no filtered revisions), so before this series branch2-served.hidden file would not contain any cache hash, only revnum and node. Now it also has a hash when there are obsolete changesets in the repo. The command that the message appears for is changing branch of 5 and 6, which are now obsolete, so the cache hash changes. In general, when cache is simply out-of-date, it can be updated using the old version as a base. But if cache hash differs, then the cache for that particular repo filter is recomputed (at least with the current implementation). This is what happens here. test-obsmarker-template.t: the pull reports 2 heads changed, but after that the repo correctly sees only 1. The new message could be better, but it's still an improvement over the previous one where hg pull suggested merging with an obsolete revision. test-obsolete.t: we can see these revisions in hg log --hidden, but they shouldn't be considered heads even with --hidden. test-rebase-obsolete{,2}.t: there were new heads created previously after making new orphan changesets, but they weren't detected. Now we are properly detecting and reporting them. test-rebase-obsolete4.t: there's only one head now because the other head is pruned and was falsely reported before. test-static-http.t: add obsstore to the list of requested files. This file doesn't exist on the remotes, but clients want it anyway (they get 404). This is fine, because there are other nonexistent files that clients request, like .hg/bookmarks or .hg/cache/tags2-served. Differential Revision: https://phab.mercurial-scm.org/D12097

obsolete: make sure windows tests pass when stat() is given a URL This is a temporary fix for an issue that's only visible on windows, but exists on other platforms as well. The issue is if we're trying to use obsstore from a remote peer and that peer is a static HTTP repo, vfs tries to os.stat() a remote file using a URL to that file (e.g. http://localhost/repo/.hg/store/obsstore). The next patch in this series makes branchcache obsolescence-aware, so in certain situations exchange process will try os.stat()ing a URL. On windows this will produce an OSError that is not ENOENT, but EINVAL instead (because of `:` symbol, for example). Differential Revision: https://phab.mercurial-scm.org/D12100

transaction: do not rely on a global variable to post_finalize file We can just add a new argument to the `addfilegenerator` function. This is more explicit and therefor clearer and less error prone. Differential Revision: https://phab.mercurial-scm.org/D12125

dirstate: introduce a "tracked-key" feature A new format variant is introduced. When used, a `tracked-key` file will be generated. That file will be update when the set of tracked file might have changed. This will be useful for external automation (e.g. build tool) to be notified when the set of relevant files changes. One of the motivation for this changes is to mitigate effect dirstate-v2 has on such automation. Since the dirstate file is updated much more frequently on dirstate-v2, monitoring update to that file is no longer a viable strategy. See the associated documentation for details about the feature To prevent older client to update the repository without updating that file, a new requirements is introduced. The `postfinalizegenerators` business is a bit weird, so I'll likely clean that up soon. Differential Revision: https://phab.mercurial-scm.org/D12124

dirstate: rename the filegenerator used for writing We will need a different name in the next changesets. Changing the name is actually not that trivial so we do it in its own changeset. Differential Revision: https://phab.mercurial-scm.org/D12123