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Release Notes

Features and bugfixes in our latest releases. Please see the Download page for links to source and binaries.

Note that Mercurial follows a time-based release plan with major releases every three months and minor (bugfix) releases on the first of every month (see TimeBasedReleasePlan).

Be sure to read the upgrade notes when upgrading.

(See the archive for older versions)

1. Mercurial 4.3.3 (2017-10-01)

• Prevent crashes when clearing progress bar. (issue5684)

• rebase: move bookmarks with --keep (issue5682)

2. Mercurial 4.3.2 (2017-09-18)

• restore compatibility with older versions of Python 2.7 by not using a bytearray with struct.unpack_from()
• restore mingw compatibility for setup.py
• hgwebdir: read 'web.template' untrusted (plugs potential security issue)

• repair: preserve phase when not using generaldelta (issue5678)

• ssh: fix flakey ssh errors on BSD systems

• restore error handling behavior around certain I/O errors; the regressed behavior could result in transactions not being properly rolled back if stdio handles encountered errors (issue5658)

• templatekw: choose {latesttag} by len(changes), not date (issue5659)

• record: fix revert -i for lines without newline (issue5651)

• mq: create non-lossy patches, also with custom global diff configuration

3. Mercurial 4.3 / 4.3.1 (2017-08-10)

(4.3.1 was released immediately after 4.3 to fix a release oversight.)

An overview of new features available. This is a regularly-scheduled quarterly feature release.

3.1. Notable changes

• experimental amend extension providing the amend command
• experimental sparse extension
• Support for Python 2.6 has been dropped.
• Bundles created by the strip extension now store phase information. It will be restored when unbundling.
• The strip extension now removes relevant obsmarkers. If a backup requested (the default), the obsmarkers are stored in the backup bundle and will be restored when unbundling.

• hg show work (from the experimental show extension) now displays more info

• hg show stack is a new view for the current, in-progress changeset and others around it

• Mitigation for two security vulnerabilities

3.2. CVE-2017-1000115

Mercurial's symlink auditing was incomplete prior to 4.3, and could be abused to write to files outside the repository.

3.3. CVE-2017-1000116

Mercurial was not sanitizing hostnames passed to ssh, allowing shell injection attacks on clients by specifying a hostname starting with -oProxyCommand. This is also present in Git (CVE-2017-1000117) and Subversion (CVE-2017-9800), so please patch those tools as well if you have them installed.

4. Mercurial 4.2.3 (2017-08-10)

This was an out-of-cycle backport of security fixes from 4.3 for users stuck on Python 2.6.

5. Mercurial 4.2.2 (2017-07-05)

This is a regularly-scheduled bugfix release.

• largefiles: avoid a crash when archiving a subrepo with largefiles disabled
• rebase: also test abort from pretxnclose error

• rebase: backed out changes 2519994d25ca and cf8ad0e6c0e4 (issue5610)

• rebase: reinforce testing around precommit hook interrupting a rebase

6. Mercurial 4.2.1 (2017-6-4)

This is a regularly-scheduled bugfix release.

• hg graft now works when grafting across merges that were problematic before (b4e1e30528c7).

• A race condition in hg status was partially fixed (issue5584).

• The message about deprecated SHA-1 hashes in the [hostfingerprints] config section now references the correct syntax for replacing them with SHA-256 hashes (issue5559).

7. Mercurial 4.2 (2017-5-2)

An overview of new features available. This is a regularly-scheduled quarterly feature release.

7.1. Notable changes

• Pager support has been moved into core and is now enabled by default. This is now controlled with the ui.paginate setting.
  • Note that in 4.2-rc, the ui.paginate option was named pager.enable. The old name has been dropped in the final release. If you had turned pagination off using pager.enable=False, please update your config.
• Color support has also been moved into core and is now enabled by default (the ui.color setting now defaults to 'auto').

• The new experimental 'show' extension provides a way to view various information about your repository in an ergonomic way. It is deliberately designed for human consumption and not for scripting, so it doesn't carry the same backward compatibility guarantees as other commands. See 'hg help -e show' for more information.

• Mercurial now requires setuptools on Windows.

7.2. commands

• Pager support has been added to the 'log', 'diff', 'branches', 'files', 'status', 'summary', and 'tags' commands, as well as the '--patch', '--list', and '--stat' options of hg shelve.
• bisect: set a blockedtag when running the check command
• bookmarks: check HG_PENDING strictly
• branches: populate all template keywords in formatter
• commandserver: handle backlog before exiting
• commandserver: prevent unlinking socket twice
• commit: optionally strip quotes from commit template (BC)
• diff: add --binary option for git mode diffs

• help: add pointer how to narrow list of resolved/unresolved files (issue5469)

• pager: advertise the config option in the default hgrc

• pager: avoid shell=True on subprocess.Popen for better errors (issue5491)

• pager: don't terminate with extreme prejudice on SIGPIPE (BC)
• pager: exit cleanly on SIGPIPE (BC)
• pager: improve support for various flavors of 'more' on Windows
• pager: use less as a fallback on Unix

• pull: abort pull --update if config requires destination (issue5528)

• serve: add support for Mercurial subrepositories
• status: handle more node indicators in buildstatus
• status: support commands.status.relative config

• update: accept --merge to allow merging across topo branches (issue5125)

• verify: fix length check

7.3. core

• bundle2: ignore errors seeking a bundle after an exception (issue4784)

• checkheads: upgrade the obsolescence postprocessing logic (issue4354)

• color: insert color code after every "\e[0m" (issue5413)

• color: sync text attributes and buffered text output on Windows (issue5508)

• config: use "churn" as an example extension
• config: drop pager from the recommended extension

• context: optimize linkrev adjustment in blockancestors() (issue5538)

• crecord: avoid setting non-existing SIGTSTP signal on windows (issue5512)

• debian: configure editor and pager to sensible-editor and sensible-pager by default

• dispatch: ignore further SIGPIPE while handling KeyboardInterrupt

• dispatch: protect against malicious 'hg serve --stdio' invocations (SEC)
• dispatch: start profiling earlier
• filemerge: optionally strip quotes from merge marker template (BC)
• formatter: add support for changeset templating
• formatter: support json formatting of long type

• graphlog: draw multiple edges towards null node (issue5440)

• graphlog: optionally strip quotes from graphnode template (BC)
• localrepo: deprecate 'repo.join' in favor of 'repo.vfs.join'
• localrepo: deprecate 'repo.opener' (API)
• localrepo: deprecate 'wfile'
• localrepo: deprecated 'repo.wopener' (API)
• match: adding support for matching files inside a directory
• packaging: add make target for linux wheels

• patch: make diff in git mode respect --text option (issue5510)

• plain: ignore [commands] config
• profiling: add statprof support for Chrome trace viewer rendering

• progress: retry ferr.flush() and .write() on EINTR (issue5532)

• py3: stop exporting urlparse from pycompat and util (API)
• rcutil: let environ override system configs (BC)
• rcutil: let rccomponents return different types of configs (API)
• rcutil: move scmutil.*rcpath to rcutil (API)
• rcutil: rename rcpath to rccomponents (API)
• rcutil: split osrcpath to return default.d paths (API)

• record: update help message to use operation instead of "record" (issue5432)

• revlog: avoid applying delta chain on cache hit
• revset: split language services to revsetlang module (API)
• revset: stop supporting plain list as input set (API)
• revset: stop supporting predicate that returns plain list (API)

• setup: use setuptools on Windows (issue5400)

• smartset: move set classes and related functions from revset module (API)
• sshpeer: try harder to snag stderr when stdout closes unexpectedly
• templatefilter: add support for 'long' to json()
• templatekw: have showlist() take mapping dict with no **kwargs expansion (API)

• templatekw: make join() escape values of extras (BC) (issue5504)

• templater: make pad() strip color codes before computing width (issue5416)

• test-profile: allow negative time in JSON output (issue5542)
• track-tags: write all tag changes to a file
• util: always force line buffered stdout when stdout is a tty (BC)
• vfs: extract 'vfs' class and related code to a new 'vfs' module (API)

7.4. extensions

• histedit: log the time taken to read in the commands list

• histedit: make check for unresolved conflicts explicit (issue5545)

• histedit: modify rollup to discard date from the rollup commit (issue4820)

• histedit: use safecleanupnode in _aborthistedit (issue5500)

• largefiles: add copytostore() fstandin argument to replace readstandin() (API)
• largefiles: add lfile argument to updatestandin() for efficiency (API)
• largefiles: make copytostore() accept only changectx as the 2nd argument (API)
• largefiles: omit updating newly added standin at linear merging
• largefiles: remove unused keyword argument of copytostore() (API)
• largefiles: replace hashrepofile by hashfile (API)
• largefiles: set the extension as enabled locally after a share requiring it

• patchbomb: add config knob to generate flags by template (issue5354)

• patchbomb: drop internal option for pbranch extension (API)
• patchbomb: use modern pager to display -n/--test result (BC)

• rebase: abort hg pull --rebase if rebase.requiredest is set (issue5514)

• rebase: abort if *any* commit in rebase set is public
• rebase: add flag to require destination
• rebase: allow aborting if last-message.txt is missing

• rebase: allow destination-free continue and abort (issue5513)

• rebase: allow rebasing children of wd to wd if a new branch has been set (BC)

• rebase: unhide original working directory node as well (issue5219)

• shelve: add -n/--name option to unshelve (issue5475)

• shelve: add logic to preserve active bookmarks
• show: new extension for displaying various repository data

7.5. hgweb

• hgweb: add a "patch" query parameter to filelog command
• hgweb: do not show "descending" link in followlines UI for filelog heads
• hgweb: handle a "descend" query parameter in filelog command
• hgweb: handle a "linerange" request parameter in filelog command
• hgwebdir: add support for explicit index files

7.6. Behavior changes

• commit: optionally strip quotes from commit template (BC)
• filemerge: optionally strip quotes from merge marker template (BC)
• graphlog: optionally strip quotes from graphnode template (BC)
• pager: don't terminate with extreme prejudice on SIGPIPE (BC)
• pager: exit cleanly on SIGPIPE (BC)
• patchbomb: use modern pager to display -n/--test result (BC)
• rcutil: let environ override system configs (BC)
• rebase: allow rebasing children of wd to wd if a new branch has been set (BC)

• templatekw: make join() escape values of extras (BC) (issue5504)

• util: always force line buffered stdout when stdout is a tty (BC)

7.7. Internal API changes

• largefiles: add copytostore() fstandin argument to replace readstandin() (API)
• largefiles: add lfile argument to updatestandin() for efficiency (API)
• largefiles: make copytostore() accept only changectx as the 2nd argument (API)
• largefiles: remove unused keyword argument of copytostore() (API)
• largefiles: replace hashrepofile by hashfile (API)
• localrepo: deprecate 'repo.opener' (API)
• localrepo: deprecated 'repo.wopener' (API)
• patchbomb: drop internal option for pbranch extension (API)
• py3: stop exporting urlparse from pycompat and util (API)
• rcutil: let rccomponents return different types of configs (API)
• rcutil: move scmutil.*rcpath to rcutil (API)
• rcutil: rename rcpath to rccomponents (API)
• rcutil: split osrcpath to return default.d paths (API)
• revset: split language services to revsetlang module (API)
• revset: stop supporting plain list as input set (API)
• revset: stop supporting predicate that returns plain list (API)
• smartset: move set classes and related functions from revset module (API)
• templatekw: have showlist() take mapping dict with no **kwargs expansion (API)
• vfs: extract 'vfs' class and related code to a new 'vfs' module (API)

8. Mercurial 4.1.3 (2017-4-18)

This is an out of cycle release to address a security issue:

• hg serve --stdio could be tricked into granting authorized users access to the Python debugger. Thanks to Jonathan Claudius of Mozilla for reporting this issue. This issue is only a security issue for repositories served using --stdio, which includes ssh but *not* http. This is CVE-2017-9462.

9. Mercurial 4.1.2 (2017-4-3)

This is a regularly-scheduled bugfix release.

• Mercurial should work inside IIS on Windows again. (issue5493)

• zstd support now refuses to work on old bundle formats. (issue5506)

• Merges involving subrepositories no longer crash in some cases. (issue5505)

• Checking for new heads during push is no longer accidentally quadratic

10. Mercurial 4.1.1 (2017-3-2)

This is a regularly-scheduled bugfix release.

• Several incorrect mailing list addresses have been corrected.
• Various error cases have been corrected during push and pull.
• Minor issues that happened when Mercurial spawned worker processes have been fixed.

11. Mercurial 4.1 (2017-2-1)

An overview of new features available. This is a regularly-scheduled quarterly feature release.

11.1. commands

• commands: config option to control bundle compression level
• crecord: add an experimental option for space key to move cursor down
• crecord: rewrite status line text (BC)
• diff: add experimental support for more git-diff extended diff features

• graft: support grafting changes to new file in renamed directory (issue5436)

• help: show help for disabled extensions (issue5228)

• help: update help for 'hg update' which was misleading (issue5427)

• merge: fix crash on criss cross merge with dir move and delete (issue5020)

• summary: add evolution "troubles" information to summary output
• summary: use the same labels as log command in "parent: " line
• templates: display evolution "troubles" in command line style

11.2. core

• changelog: keep track of file end in appender (issue5444)

• dispatch: stop supporting non-use of @command (API)
• hook: do not redirect stdout/err/in to ui while running in-process hooks (BC)
• httppeer: advertise and support application/mercurial-0.2
• localrepo: experimental support for non-zlib revlog compression
• manifest: add bundlemanifestlog support
• manifest: add unionmanifestlog support
• manifest: make revlog verification optional
• patch: add experimental config knob for displaying the index header
• patch: add similarity config knob in experimental section
• patch: add label for coloring the index extended header
• patch: add label for coloring the similarity extended header
• profiling: make statprof the default profiler (BC)
• profiling: use vendored statprof and upstream enhancements (BC)
• revlog: REVIDX_EXTSTORED flag
• revlog: add clone method
• revlog: ensure that flags do not overflow 2 bytes
• revlog: flag processor
• revlog: inline start() and end() for perf reasons
• revlog: make compressed size comparisons consistent
• revlog: merge hash checking subfunctions
• revlog: move decompress() from module to revlog class (API)
• revlog: optimize _chunkraw when startrev==endrev
• revlog: pass revlog flags to addrevision
• revlog: reorder index accessors to match data structure order
• revlog: use compression engine API for compression
• revlog: use compression engine APIs for decompression
• revset: add regular expression support to 'desc'

• revset: make children() not look at p2 if null (issue5439)

• run-tests: forward Python USER_BASE from site (issue5425)

• server: move cmdutil.service() to new module (API)

• templatekw: force noprefix=False to insure diffstat consistency (issue4755)

• ui: check EOF of getpass() response read from command-server channel
• ui: do not translate empty configsource() to 'none' (API)
• ui: factor out ui.load() to create a ui without loading configs (API)
• util: compression APIs to support revlog compression and decompression
• util: declare wire protocol support of compression engines
• wireproto: advertise supported media types and compression formats
• wireproto: only advertise HTTP-specific capabilities to HTTP peers (BC)
• wireproto: perform chunking and compression at protocol layer (API)

11.3. extensions

• convert: add config option to control storing original revision
• convert: add config option to copy extra keys from Git commits
• convert: config option for git rename limit
• convert: config option to control Git committer actions

• rebase: calculate ancestors for --base separately (issue5420)

• rebase: check for conflicts before continuing
• rebase: fail-fast the pull if working dir is not clean (BC)
• shelve: allow multiple shelves with --patch and --stat

• shelve: choose a legal shelve name when no name is passed (issue5112)

• shelve: make --keep option survive user intervention (issue5431)

• shelve: make unshelve not crash when there are missing files (issue4176)

11.4. hgweb

• hgweb: link to raw-file on annotation page (BC)
• hgweb: make log streams compatible with command server
• hgweb: restore ascending iteration on revs in filelog web command
• hgweb: support Content Security Policy

11.5. chg

• chg: send type information via S channel (BC)
• chg: support long socket path
• chgserver: make S channel support pager request
• chgserver: override runcommand

11.6. Behavior Changes

• chg: send type information via S channel (BC)
• crecord: rewrite status line text (BC)
• hgweb: link to raw-file on annotation page (BC)
• hook: do not redirect stdout/err/in to ui while running in-process hooks (BC)
• profiling: make statprof the default profiler (BC)
• profiling: use vendored statprof and upstream enhancements (BC)
• rebase: fail-fast the pull if working dir is not clean (BC)
• wireproto: only advertise HTTP-specific capabilities to HTTP peers (BC)

11.7. Internal API Changes

• bookmarks: make bookmarks.comparebookmarks accept binary nodes (API)
• bookmarks: rename 'compare()' to 'comparebookmarks()' (API)
• revlog: move decompress() from module to revlog class (API)
• server: move cmdutil.service() to new module (API)
• ui: do not translate empty configsource() to 'none' (API)
• ui: factor out ui.load() to create a ui without loading configs (API)
• util: remove compressors dict (API)
• util: remove decompressors dict (API)
• wireproto: perform chunking and compression at protocol layer (API)
• dispatch: stop supporting non-use of @command (API)

12. Mercurial 4.0.2 (2017-01-04)

This is a regularly-scheduled bugfix release.

• demandimport: do not raise ImportError for unknown item in fromlist

• posix: make poll() restart on interruption by signal (issue5452)

• hgweb: add missing slash to file log url in rss style

13. Mercurial 4.0.1 (2016-12-1)

This is a regularly-scheduled bugfix release.

• hgweb: cache fctx.parents() in annotate command (issue5414)

• vfs, scmutil: ignore EPERM at os.utime, which avoids ambiguity (issue5418)

14. Mercurial 4.0 (2016-11-1)

An overview of new features available. This is a regularly-scheduled quarterly feature release. Unlike other 4.0 software releases, this is simply 3.9 + .1, so it should be the usual pain-free upgrade.

14.1. commands

• annotate: calculate line count correctly
• branchmap: acquires lock before writting the rev branch cache

• clone: set default path correctly when doing a clone+share (issue5378)

• copy: distinguish "file exists" cases and add a hint (BC)

• commit: return 1 for interactive commit with no changes (issue5397)

• config: add template support

• debugobsolete: add formatter support (issue5134)

• files: change documentation to match its behaviour (issue5276)

• grep: add formatter support

• help: show content for explicitly disabled extension (issue5228)

• import: abort instead of crashing when copy source does not exist (issue5375)

• import: report directory-relative paths in error messages (issue5224)

• log: copy the way of ancestor traversal to --follow matcher (issue5376)

• log: preserve topo sort in graph even if additional filter options specified
• merge: add conflict labels to merge command

• merge: avoid superfluous filemerges when grafting through renames (issue5407)

• strip: report both bundle files in case of exception (issue5368)

• tag: clarify warning about making a tag on a branch head
• version: add formatter support
• flags: allow specifying --no-boolean-flag on the command line (BC)

14.2. core

• changelog: disable delta chains

• copies: make _checkcopies handle copy sequences spanning the TCA (issue4028)

• formatter: add function to convert list to appropriate format (issue5217)

• lock: show more detail for new-style locks in lock waiting message (issue4752)

• revset: do not rewrite ':y' to '0:y' (issue5385)

• revset: fix order of nested '_(|int|hex)list' expression (BC)
• revset: fix order of nested 'or' expression (BC)
• revset: fix order of nested 'range' expression (BC)
• revset: make reverse() and sort() no-ops when ordering requirement allows (BC)

• revset: support "follow(renamed.py, e22f4f3f06c3)" (issue5334)

• templater: provide a termwidth keyword (issue5395)

• templater: add inheritance support to style maps

• templater: add relpath() to convert repo path to relative path (issue5394)

• templater: make pad() evaluate boolean argument (BC)
• wireproto: unescape argument names in batch command (BC)

14.3. extensions

• journal: properly check for held lock (issue5349)

• journal: use fm.formatdate() to pass date tuple in appropriate type (BC)
• journal: use fm.formatlist() to pass hashes in appropriate type (BC)
• journal: use fm.hexfunc() to get full hash in JSON/template output (BC)
• largefiles: fix 'deleted' files sometimes persistently appearing with R status
• largefiles: handle that a found standin file doesn't exist when removing it
• largefiles: more safe handling of interruptions while updating modifications
• largefiles: when setting/clearing x bit on largefiles, don't change other bits
• mq: release lock after transaction in qrefresh
• mq: take wlock when 'qqueue' is doing write operations

• rebase: properly calculate total commits to rebase (issue5347)

• rebase: rebase changesets in topo order (issue5370) (BC)

14.4. hgweb

• hgweb: avoid line wrap between revision and annotate-info (issue5398)

• hgweb: config option to control zlib compression level