New Features
Added a way of specifying required extensions that prevent
Mercurial from starting if they are not found. See hg help
config.extensions.
Merge conflict markers have been made clearer (see backwards
compatibility below)
Improve detailed error codes
Added a hint about mangled whitespace on bad patch
Explain which order the commits are presented in chistedit
Introduce a dirstate-tracked-hint feature to help automation
keep track of changes to tracked files. See hg help
config.use-dirstate-tracked-hint.
Shared repositories can be upgraded if the upgrade is specific
to the share. For now, this only applies to dirstate-v2 and
dirstate-tracked-hint.
When using the narrow extension, non-conflicting changes to
files outside of the narrow specification can now be merged.
When cloning a repository using stream-clone, the client can
now control the repository format variants to use as long as
the stream content does not restrict that variant.
Default Format Change
These changes affect newly created repositories (or new clones)
done with Mercurial 6.1.
The share-safe format variant is now enabled by default. It
makes configuration and requirements more consistent across
repository and their shares. This introduces a behavior change
as shares from a repository using the new format will also use
their main repository's configuration. See hg help
config.format.use-share-safe for details about the feature and
the available options for auto-upgrading existing shares.
New Experimental Features
The pure Rust version of Mercurial called rhg added support
for most common invocations of hg status. See hg help rust.rhg
for details on how to try it out.
rhg supports narrow clones and sparse checkouts.
Bug Fixes
Obsolete revisions are skipped while computing heads. In
conjunction with the evolve extension >= 10.5.0, this leads to
massive exchange (push/pull) speedups in repositories with a
lot of heads and/or obsolete revisions.
Stream-clones now properly advertise all requirements needed.
This can result in the stream-clone feature being disabled for
some clients using < 6.0.2. A small bugfix patch for these
older client is available if necessary.
The --no-check and --no-merge flags now properly overwrite the
behavior from commands.update.check
rhg's fallback detection is more robust in general in the
presence of more advanced configs
rhg's blackbox now supports milliseconds by default and uses
the same ISO 8601 format as the Python implementation
Fix rhg crash on non-generaldelta revlogs
The lfs, largefiles and sparse extensions now correctly take
the appropriate lock before writing requirements
The notify extension does not produce errors anymore if a
revision is not found
Remove unnecessary and overly strict check for divergence in
hg fix
Windows compatibility improvements
Miscellaneous Python 3 and typing improvements
Many other small or internal fixes
Backwards Compatibility Changes
The use of share-safe, means shares (of new repositories) will
also use their main repository's configuration see the Default
Format Change section for details.
The fix to stream-clone requirements advertising means some
requirements previously (wronly) omitted are now sent. This
can confuse client using a Mercurial version < 6.0.2. The client
would consider these requirements unsupported even if it actually
know them. If you encounter this, either upgrade your client
or apply the necessary patch.
The labels passed to merge tools have changed slightly. Merge
tools can get labels passed to them if you include $labellocal,
$labelbase, and/or $labelother in the merge-tool.<tool name>.args
configuration. These labels used to have some space-padding,
and truncation to fit within 72 columns. Both the padding and
the truncation has been removed.
Some of the text in labels passed to merge tools has changed.
For example, in conflicts while running hg histedit, the labels
used to be "local", "base", and "histedit". They are now "already
edited", "parent of current change", and "current change",
respectively.
The computation of namedbranch heads now ignores obsolete
revisions. User of the Changeset Evolution feature may see a
change in location and numbers of heads of each named branches
(and topic).
The remotefilelog extension now requires an appropriate
excludepattern for subrepositories.
debugsparse's interface has been reworked to be more flexible.
Since it's a debug command it is not actually a breaking change,
but it is worth noting here.
Temporary files for merges are now all inside a hgmerge directory
instead of at the root of TMPDIR. The corresponding experimental
mergetempdirprefix config option has been removed.
Internal API Changes
The dirstate API received minor modifications.
Miscellaneous
Removed exchange-v2. It was a prototype that had never been in
a working state and had been left untouched since 2017.
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