# Mercurial 6.7 (2024-03-15)

## Mercurial 6.7.4 

Exceptional release following a critical regression causing possible data loss
in certain conditions:

- inline-changelog: fix a critical bug in write_pending that delete data (3cf9e52f5e27)
- inline-changelog: fix pending transaction visibility when splitting (1721d983dd6d)

Other changes in this release:

- exchange: fix locking to actually be scoped
- chistedit: change action for the correct item
- rust-status: sort the failed matches when printing them
- hooks: add a prewlock and a prelock hooks
- bookmark: fix remote bookmark deletion when the push is raced

## Mercurial 6.7.3 

⚠️ This release contains a bug causing possible data loss, use 6.7.4 instead.

- setup: display return code information about failed `hg` call
- bundle-spec: properly identify changegroup-less bundle
- bundle-spec: properly parse boolean configuration as boolean
- matchers: fix the bug in rust PatternMatcher that made it cut off early
- match: fix the "visitdir" method on "rootfilesin" matchers
- match: fix the rust-side bug in visit_children_set for rootfilesin matchers
- match: strengthen visit_children_set invariant, Recursive means "all files"
- wireprotoserver: ensure that output stream gets flushed on exception
- re2: make errors quiet
- dirstate-v2: add check of parent/child nodes being related when writing
- dirstate-v2: check that root nodes are at the root before writing
- rust-cpython: don't swallow the dirstate error message
- rust: blanket implementation of Graph for Graph references
- Various fixes to `admin::verify`

## Mercurial 6.7.2 

⚠️ This release contains a bug causing possible data loss, use 6.7.4 instead.

Exceptional release following a large performance regression when cloning.

We are setting up automated benchmarks to reduce the likelihood of regressions
of the sort from happening in the future.

- phases: avoid a potentially costly dictionary interation in some case
- phases: update the phase set as we go during retract boundary
- bundle2: make the "hgtagsfnodes" part advisory

## Mercurial 6.7.1 

⚠️ This release contains a bug causing possible data loss, use 6.7.4 instead.

Exceptional release following a crash found in delta code that can be triggered
with complex repository shapes.

- delta-search: fix crash caused by unbound variable
- sshpeer: fix path when handling invalid url exception
- subrepo: fix normalizing paths with scheme

## Mercurial 6.7 

⚠️ This release contains a bug causing possible data loss, use 6.7.4 instead.

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

### New Features 

- JSON templates can now use structured diffstat data
- Support rhg status --rev --rev
- The index for REVLOGv1 now has a Rust implementation
- Improved `hg censor`'s output
- censor: add a command flag to skip the head checks
- censor: accept multiple revision in a single call
- usage: add a `usage.repository-role` config
- branchmap: use mmap for faster revbranchcache loading
- crecord: enable search hotkeys (issue6834)
- hg-core: separate timestamp and extra methods
- annotate: limit output to range of lines
- unbundle: faster computation of changed heads
- Large improvements of some of the phases code (23950e39281f)
- rust-filepatterns: export glob_to_re function

### New Experimental Features 

- Introduce `hg admin::chainsaw-update` for automation and *advanced* users

### Bug Fixes 

- templatekw: fix inconsistency of diffstat with diff.merge
- The endless stream of Python 3 cleanups continues
- Improved setup.py robustness
- Improved test suite robustness
- add: don't attempt to add back removed files unless explicitly listed
- statprof: handle `lineno == None` in more cases
- rust: fix cargo doc for hg-cpython
- rust-python-index: don't panic on a corrupted index when calling from Python
- debugindexstats: handle the lack of Rust support better
- matchers: use correct method for finding index in vector
- narrow: strip trailing `/` from manifest dir before matching it
- cext: fix potential memory leaks of list items appended with PyList_Append
- doc: document that labels must have a dot in them to have an effect
- debugformat: fix formatting for compression level
- obsutil: sort metadata before comparing in geteffectflag()
- crecord: drop calls to `curses.endwin()`
- rust-index: don't use mutable borrow for head-diff computation
- rust-index: don't use mutable borrow to computed filtered heads


### Backwards Compatibility Changes 

Users of the Rust extensions and/or `rhg` should be aware that the new Rust
index can result in a performance degradation for push/pull on repositories
- not* using `persistent-nodemap` (see `hg help config.format.use-persistent-nodemap`).

If this is something that matters to you, please reach out to us as this is not
an insurmountable obstacle. This is a choice base on the assumption that
there are few people in this situation and our time should be spent on more
pressing matters.

### Internal API Changes 

- 62913:498017baa34b "cleanup: remove some code scheduled to be removed after 5.9"
- 62914:88ef80210d67 "cleanup: drop `dirstate.is_changing_parent` deprecated since 6.5"
- 62915:591845f89ada "cleanup: drop `path.pushloc` deprecated since 6.5"
- 62916:d8f65fc72e7b "cleanup: drop deprecated config attribute on the revlog class"
- 62917:5c9c41273367 "cleanup: turn `pathsuboption` deprecation warning into an error"
- 62918:7b837fabc990 "cleanup: turn `wrappedfunction` deprecation warning into an error"
- 62919:eda075d7b2ac "cleanup: turn `wrapfunction` deprecation warning into an error"
- 62920:c845479fc64d "cleanup: drop the `bytes` compatibility for attribute related function"
- 63464:dcaa2df1f688 "changelog: never inline changelog"
- 63465:a93e52f0b6ff "changelog: disallow delayed write on inline changesets"
- 63825:79cd29d598af "dirstate: make the `transaction` argument of `setbranch` mandatory"

### Miscellaneous 

- perf: support --template on perf::phases
- perf: add a --as-push option to perf::unbundle
- debug: add a debug::unbundle command that simulate the unbundle from a push
- Lots of refactorings to prepare for performance improvements and remove tech debt
