pull: improved message issued in case of failed update When running `hg pull --update`, the update step may fail. Nothing in the error message help to understand the abort is related to the secondary step (update) instead of the primary step (pull). We now add some information to the error message to clarify it comes from the update part. It is useful in various situation (uncommitted changes blocking the update, update to hidden destination, etc...) The pull output is updated from: $ hg pull ../repo-Bob --rev 956063ac4557 --update pulling from ../repo-Bob searching for changes adding changesets adding manifests adding file changes added 2 changesets with 0 changes to 2 files (+1 heads) (2 other changesets obsolete on arrival) abort: filtered revision '6'! to: $ hg pull ../repo-Bob --rev 956063ac4557 --update pulling from ../repo-Bob searching for changes adding changesets adding manifests adding file changes added 2 changesets with 0 changes to 2 files (+1 heads) (2 other changesets obsolete on arrival) abort: cannot update to target: filtered revision '6'! (I am not sure why the actual error, "filtered revision '6'", is not using the more modern format mentioning the obsolescence fate of '6')

pull: deal with locally filtered changeset passed into --rev Nowadays, it is possible to explicitly pull a remote revision that end up being hidden locally (eg: obsoleted locally). However before this patch, some internal processing where crashing trying to resolve a filtered revision. Without this patches, the pull output result a confusing output: $ hg pull ../repo-Bob --rev 956063ac4557 pulling from ../repo-Bob searching for changes adding changesets adding manifests adding file changes added 2 changesets with 0 changes to 2 files (+1 heads) (2 other changesets obsolete on arrival) abort: 00changelog.i@956063ac4557828781733b2d5677a351ce856f59: filtered node!

absorb: aborting if another operation is in progress This increases safety of using absorb by both aborting when another operation is in progress (since the absorption could confuse any other command a lot) and holding the locks throughout the reading of the working directory (for which changes to absorb) and the reading of the repo (for which changes to absorb into). Differential Revision: https://phab.mercurial-scm.org/D6237

repoview: keep the branchmap cache for the `served.hidden` view warm For the same reason we want to keep the cache for the `served` view up to date, we want to also keep the `served.hidden` view up to date. If some processes with a readonly access to the repo needs to access it, we better have the cache warm to avoid computing the same data over and over and over. In most case (no secret changesets), the "served" and "served.hidden" set will be identical and no cache will actually have to be updated.

repoview: introduce a filter for serving hidden changesets There are multiple usecase for being able to explicitly view or pull obsolete from a server. We need to be able to do so without exposing the secret changesets. We introduces a dedicated repository "view" to do so. Way to expose this "view" to the user will come later. To keep a behavior consistent with expected client/server behavior, the general idea is for the obsolete access to be explicitly requested by the code generating the request. In addition, the will be server side configuration to restrict the access to this feature.

repoview: fix conditional around unserved changesets The conditional could lead to wrong computation since we have more unserved changesets than just the "secret" phase. In addition, now that we have efficient caching of phased changesets, we don't need the conditional anymore.

branch: return early if we find an open named branch apart from default The current code builds a list of all the open named branches except default and then bool that. This is mostly fine until you get a repo which has thousands of named branches. Differential Revision: https://phab.mercurial-scm.org/D6211

branchcache: don't verify closed nodes in _branchtip() We only do membership testing there. Differential Revision: https://phab.mercurial-scm.org/D6210