configitems: add an official API for extensions to register config item Extensions can have a 'configtable' mapping and use 'registrar.configitem(table)' to retrieve the registration function. This behave in the same way as the other way for extensions to register new items (commands, colors, etc).

configitems: extract the logic to build a registrar on any configtable Having the logic available independently from the mapping used is a necessary step toward extensions support.

obsolete: skip 'changectx' usage in unstable computation We simplify the unstable computation code, skipping the expensive creation of changectx object. We focus on efficient set operation and revnumber centric functions. In my mercurial development repository, this provides a 3x speedup to the function: before: 5.319 ms after: 1.844 ms repo details: total changesets: 40886 obsolete changesets: 7756 mutable (not obsolete): 293 unstable: 30

obsolete: provide a small function to retrieve all mutable revisions More obsolescence related algorithm focus on the mutable revision. We provide a tiny utility function to make it easy to access this set.

bundle2: add debug info about the number of stream params Seems like the %i was never substituted.

bundle2: add some debugging information to the not-a-bundle error I found this useful while trying to debug wireproto-related issues.

tests: more completely restore the environment in syshgenv Update the syshgenv function to attempt to completely restore the original environment, rather than only updating a few specific variables. run_tests.py now generates a shell script that can be used to restore the original environment, and syshgenv sources it. This is a bit more complicated than the previous code, but should do a better job of running the system hg in the correct environment. I've tested it on Linux using python 2.x, but let me know if it causes issues in other environments. I'm not terribly familiar with how the tests get run on Windows, for instance, and how the environment needs to be updated there.

tests: do not use system hg if it does not have "files" command Ancient hg does not have "hg files" so test-check-*.t will fail with "unknown command 'files'": $ hg files hg: unknown command 'files' $ hg --version Mercurial Distributed SCM (version 2.6.2) Test "hg files" and give up using syshg if it does not have "files" command.

setup: fix runcmd() usage on darwin Fix one invocation of runcmd() that was missed in the recent change to make runcmd() also return the process exit status.

py3: update the python3-whitelist with new tests which pass on Python 3 We have now 34 tests passing on Python 3.

setup: fix localhgenv It should return env as a dict instead of None.

tests: use the system hg for examining the local repository Most test scripts use "hg" to interact with a temporary test repository. However a few tests also want to run hg commands to interact with the local repository containing the mercurial source code. Notably, many of the test-check-* tests want to check local files and commit messages. These tests were previously using the version of hg being tested to query the source repository. However, this will fail if the source repository requires extensions or other settings not supported by the version of mercurial being tested. The source repository was typically initially cloned using the system hg installation, so we should use the system hg installation to query it. There was already a helpers-testrepo.sh script designed to help cope with different requirements for the source repository versus the test repositories. However, it only handled the evolve extension. This new behavior works with any extensions that are different between the system installation and the test installation.

tests: save the original PATH and PYTHONPATH variables When running the tests, define ORIG_PATH and ORIG_PYTHONPATH environment variables that contain the original contents of PATH and PYTHONPATH, before they were modified by run-tests.py This will make it possible for tests to refer to the original contents of these variables if necessary. In particular, this is necessary for invoking the correct version of hg for examining the local repository (the mercurial repository itself, not the temporary test repositories). Various tests examine the local repository to check the file lists and contents of commit messages.

setup: prefer using the system hg to interact with the local repository Add a findhg() function that tries to be smarter about figuring out how to run hg for examining the local repository. It first tries running "hg" from the user's PATH, with the default HGRCPATH settings intact, but with HGPLAIN enabled. This will generally use the same version of mercurial and the same settings used to originally clone the repository, and should have a higher chance of working successfully than trying to run the hg script from the local repository. If that fails findhg() falls back to the existing behavior of running the local hg script.