Mercurial 6.8rc0

This is a tentative release, any and all notes below are subject to change or removal.

As usual, a *lot* of patches don't make it to this list.

New Features or performance improvements

• Phases have been reworked to improve their general performance
  • revset: stop serializing node when using "%ln"
  • phases: convert remote phase root to node while reading them
  • phases: use revision number in new_heads
  • phases: use revision number in analyze_remote_phases

  • phases: stop using repo.set in remotephasessummary

  • phases: move RemotePhasesSummary to revision number

  • phases: use revision number in _pushdiscoveryphase

  • phases: introduce a performant efficient way to access revision in a set
  • phases: rework the logic of _pushdiscoveryphase to bound complexity
• The Rust working copy code is being used by more places now:
  • matchers: support patternmatcher in rust
  • dirstate: remove the python-side whitelist of allowed matchers

• stream-clone: disable gc for _entries_walk duration

• stream-clone: disable gc for the initial section for the v3 format
• postincoming: avoid computing branchhead if no report will be posted
• stream-clone: disable gc for the entry listing section for the v2 format
• perf: allow profiling of more than one run
• perf: run the gc before each run
• perf: start recording total time after warming
• perf: clear vfs audit_cache before each run

• outgoing: rework the handling of the missingroots case to be faster

• outgoing: add a simple fastpath when there is no common
• tags-cache: skip the filternode step if we are not going to use it
• tags-cache: directly operate on rev-num warming hgtagsfnodescache
• tags-cache: directly perform a monimal walk for hgtagsfnodescache warming
• exchange: improve computation of relevant markers for large repos

New Experimental Features

• Introduce a new experimental branch cache "v3":
  • branchcache: add more test for the logic around obsolescence and branch heads
  • branchcache: skip entries that are topological heads in the on disk file
  • branchcache: add a "pure topological head" fast path
  • branchcache: allow to detect "pure topological case" for branchmap

Bug Fixes

• perf-stream-locked-section: actually use v1 generation when requested
• perf-stream-locked-section: fix the call to the v3 generator
• perf-stream-locked-section: advertise the right version key in the help
• stream: in v3, skip the "size" fast path if the entries have some unknown size
• stream-clone: stop getting the file size of all file in v3
• streamclone: stop listing files for entries that have no volatile files
• perf-stream-consume: use the source repository config when applying
• bundle: do no check the changegroup version if no changegroup is included
• perf: create the temporary target next to the source in stream-consume
• bundlespec: fix the "streamv2" and "streamv3-exp" variant
• push: rework the computation of fallbackheads to be correct
• profiler: flush after writing the profiler output
• base-revsets: use an author that actually exercises a lot of changesets
• hgrc: search XDG_CONFIG_HOME on mac
• clonebundles: add missing newline to legacy response
• narrow: add a test for linkrev computation done during widen

Backwards Compatibility Changes

Internal API Changes

Miscellaneous

• obsolete: quote the feature name