revset: stop serializing node when using "%ln"
Turning hundred of thousand of node from node to hex and back can be slow… what
about we stop doing it?
In many case were we are using node id we should be using revision id. However
this is not a good reason to have a stupidly slow implementation of "%ln".
This caught my attention again because the phase discovery during push make an
extensive use of "%ln" or huge set. In absolute, that phase discovery probably
should use "%ld" and need to improves its algorithmic complexity, but improving
"%ln" seems simple and long overdue. This greatly speeds up `hg push` on
repository with many drafts.
Here are some relevant poulpe benchmarks:
### data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
# benchmark.name = hg.command.push
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.explicit-rev = all-out-heads
# benchmark.variants.issue6528 = disabled
# benchmark.variants.protocol = ssh
# benchmark.variants.reuse-external-delta-parent = default
## benchmark.variants.revs = any-1-extra-rev
before: 44.235070
after: 20.416329 (-53.85%, -23.82)
## benchmark.variants.revs = any-100-extra-rev
before: 49.234697
after: 26.519829 (-46.14%, -22.71)
### benchmark.name = hg.command.bundle
# bin-env-vars.hg.flavor = default
# bin-env-vars.hg.py-re2-module = default
# benchmark.variants.revs = all
# benchmark.variants.type = none-streamv2
## data-env-vars.name = heptapod-public-2024-03-25-zstd-sparse-revlog
before: 10.138396
after: 7.750458 (-23.55%, -2.39)
## data-env-vars.name = mercurial-public-2024-03-22-zstd-sparse-revlog
before: 1.263859
after: 0.700229 (-44.60%, -0.56)
## data-env-vars.name = mozilla-try-2023-03-22-zstd-sparse-revlog
before: 399.484481
after: 346.5089 (-13.26%, -52.98)
## data-env-vars.name = pypy-2024-03-22-zstd-sparse-revlog
before: 4.540080
after: 3.401700 (-25.07%, -1.14)
## data-env-vars.name = tryton-public-2024-03-22-zstd-sparse-revlog
before: 2.975765
after: 1.870798 (-37.13%, -1.10)
$ cat << EOF > buggylocking.py
> """A small extension that tests our developer warnings
> """
>
> from mercurial import error, registrar, repair, util
>
> cmdtable = {}
> command = registrar.command(cmdtable)
>
> @command(b'buggylocking', [], '')
> def buggylocking(ui, repo):
> lo = repo.lock()
> wl = repo.wlock()
> wl.release()
> lo.release()
>
> @command(b'buggytransaction', [], '')
> def buggylocking(ui, repo):
> tr = repo.transaction(b'buggy')
> # make sure we rollback the transaction as we don't want to rely on the__del__
> tr.release()
>
> @command(b'properlocking', [], '')
> def properlocking(ui, repo):
> """check that reentrance is fine"""
> wl = repo.wlock()
> lo = repo.lock()
> tr = repo.transaction(b'proper')
> tr2 = repo.transaction(b'proper')
> lo2 = repo.lock()
> wl2 = repo.wlock()
> wl2.release()
> lo2.release()
> tr2.close()
> tr.close()
> lo.release()
> wl.release()
>
> @command(b'nowaitlocking', [], '')
> def nowaitlocking(ui, repo):
> lo = repo.lock()
> wl = repo.wlock(wait=False)
> wl.release()
> lo.release()
>
> @command(b'no-wlock-write', [], '')
> def nowlockwrite(ui, repo):
> with repo.vfs(b'branch', b'a'):
> pass
>
> @command(b'no-lock-write', [], '')
> def nolockwrite(ui, repo):
> with repo.svfs(b'fncache', b'a'):
> pass
>
> @command(b'stripintr', [], '')
> def stripintr(ui, repo):
> lo = repo.lock()
> tr = repo.transaction(b'foobar')
> try:
> repair.strip(repo.ui, repo, [repo[b'.'].node()])
> finally:
> lo.release()
> @command(b'oldanddeprecated', [], '')
> def oldanddeprecated(ui, repo):
> """test deprecation warning API"""
> def foobar(ui):
> ui.deprecwarn(b'foorbar is deprecated, go shopping', b'42.1337')
> foobar(ui)
> @command(b'nouiwarning', [], '')
> def nouiwarning(ui, repo):
> util.nouideprecwarn(b'this is a test', b'13.37')
> @command(b'programmingerror', [], '')
> def programmingerror(ui, repo):
> raise error.ProgrammingError(b'something went wrong', hint=b'try again')
> EOF
$ cat << EOF >> $HGRCPATH
> [extensions]
> buggylocking=$TESTTMP/buggylocking.py
> mock=$TESTDIR/mockblackbox.py
> blackbox=
> [devel]
> all-warnings=1
> [blackbox]
> track = command, commandexception, commandfinish, develwarn
> EOF
$ hg init lock-checker
$ cd lock-checker
$ hg buggylocking
devel-warn: "wlock" acquired after "lock" at: $TESTTMP/buggylocking.py:* (buggylocking) (glob)
$ cat << EOF >> $HGRCPATH
> [devel]
> all=0
> check-locks=1
> EOF
$ hg buggylocking
devel-warn: "wlock" acquired after "lock" at: $TESTTMP/buggylocking.py:* (buggylocking) (glob)
#if no-chg no-pyoxidizer
$ hg buggylocking --traceback
devel-warn: "wlock" acquired after "lock" at:
*/hg:* in <module> (glob) (?)
*/mercurial/dispatch.py:* in run (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
$TESTTMP/buggylocking.py:* in buggylocking (glob)
#endif
#if chg no-pyoxidizer
$ hg buggylocking --traceback
devel-warn: "wlock" acquired after "lock" at:
*/hg:* in <module> (glob) (?)
*/mercurial/dispatch.py:* in run (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py:* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
*/mercurial/commands.py:* in serve (glob)
*/mercurial/server.py:* in runservice (glob)
*/mercurial/commandserver.py:* in run (glob)
*/mercurial/commandserver.py:* in _mainloop (glob)
*/mercurial/commandserver.py:* in _acceptnewconnection (glob)
*/mercurial/commandserver.py:* in _runworker (glob)
*/mercurial/commandserver.py:* in _serverequest (glob)
*/mercurial/commandserver.py:* in serve (glob)
*/mercurial/commandserver.py:* in serveone (glob)
*/mercurial/chgserver.py:* in runcommand (glob)
*/mercurial/commandserver.py:* in runcommand (glob)
*/mercurial/commandserver.py:* in _dispatchcommand (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py:* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
$TESTTMP/buggylocking.py:* in buggylocking (glob)
#endif
#if pyoxidizer
$ hg buggylocking --traceback
devel-warn: "wlock" acquired after "lock" at:
<string>:* (glob)
mercurial.dispatch:* in run (glob)
mercurial.dispatch:* in dispatch (glob)
mercurial.dispatch:* in _rundispatch (glob)
mercurial.dispatch:* in _runcatch (glob)
mercurial.dispatch:* in _callcatch (glob)
mercurial.scmutil:* in callcatch (glob)
mercurial.dispatch:* in _runcatchfunc (glob)
mercurial.dispatch:* in _dispatch (glob)
mercurial.dispatch:* in runcommand (glob)
mercurial.dispatch:* in _runcommand (glob)
mercurial.dispatch:* in <lambda> (glob)
mercurial.util:* in check (glob)
$TESTTMP/buggylocking.py:* in buggylocking (glob)
#endif
$ hg properlocking
$ hg nowaitlocking
Writing without lock
$ hg no-wlock-write
devel-warn: write with no wlock: "branch" at: $TESTTMP/buggylocking.py:* (nowlockwrite) (glob)
$ hg no-lock-write
devel-warn: write with no lock: "fncache" at: $TESTTMP/buggylocking.py:* (nolockwrite) (glob)
Stripping from a transaction
$ echo a > a
$ hg add a
$ hg commit -m a
$ hg stripintr 2>&1 | grep -E -v '^(\*\*| )'
Traceback (most recent call last):
*ProgrammingError: cannot strip from inside a transaction (glob)
$ hg oldanddeprecated
devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at: $TESTTMP/buggylocking.py:* (oldanddeprecated) (glob)
#if no-chg no-pyoxidizer
$ hg oldanddeprecated --traceback
devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at:
*/hg:* in <module> (glob) (?)
*/mercurial/dispatch.py:* in run (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
$TESTTMP/buggylocking.py:* in oldanddeprecated (glob)
#endif
#if chg no-pyoxidizer
$ hg oldanddeprecated --traceback
devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at:
*/hg:* in <module> (glob)
*/mercurial/dispatch.py:* in run (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py:* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
*/mercurial/commands.py:* in serve (glob)
*/mercurial/server.py:* in runservice (glob)
*/mercurial/commandserver.py:* in run (glob)
*/mercurial/commandserver.py:* in _mainloop (glob)
*/mercurial/commandserver.py:* in _acceptnewconnection (glob)
*/mercurial/commandserver.py:* in _runworker (glob)
*/mercurial/commandserver.py:* in _serverequest (glob)
*/mercurial/commandserver.py:* in serve (glob)
*/mercurial/commandserver.py:* in serveone (glob)
*/mercurial/chgserver.py:* in runcommand (glob)
*/mercurial/commandserver.py:* in runcommand (glob)
*/mercurial/commandserver.py:* in _dispatchcommand (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py:* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
$TESTTMP/buggylocking.py:* in oldanddeprecated (glob)
#endif
#if pyoxidizer
$ hg oldanddeprecated --traceback
devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at:
<string>:* (glob)
mercurial.dispatch:* in run (glob)
mercurial.dispatch:* in dispatch (glob)
mercurial.dispatch:* in _rundispatch (glob)
mercurial.dispatch:* in _runcatch (glob)
mercurial.dispatch:* in _callcatch (glob)
mercurial.scmutil:* in callcatch (glob)
mercurial.dispatch:* in _runcatchfunc (glob)
mercurial.dispatch:* in _dispatch (glob)
mercurial.dispatch:* in runcommand (glob)
mercurial.dispatch:* in _runcommand (glob)
mercurial.dispatch:* in <lambda> (glob)
mercurial.util:* in check (glob)
$TESTTMP/buggylocking.py:* in oldanddeprecated (glob)
#endif
#if no-chg no-pyoxidizer
$ hg blackbox -l 7
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at: $TESTTMP/buggylocking.py:* (oldanddeprecated) (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated exited 0 after * seconds (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated --traceback
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at:
*/hg:* in <module> (glob) (?)
*/mercurial/dispatch.py:* in run (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
$TESTTMP/buggylocking.py:* in oldanddeprecated (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated --traceback exited 0 after * seconds (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> blackbox -l 7
#endif
#if chg no-pyoxidizer
$ hg blackbox -l 7
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at: $TESTTMP/buggylocking.py:* (oldanddeprecated) (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated exited 0 after * seconds (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated --traceback
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at:
*/hg:* in <module> (glob)
*/mercurial/dispatch.py:* in run (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py:* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
*/mercurial/commands.py:* in serve (glob)
*/mercurial/server.py:* in runservice (glob)
*/mercurial/commandserver.py:* in run (glob)
*/mercurial/commandserver.py:* in _mainloop (glob)
*/mercurial/commandserver.py:* in _acceptnewconnection (glob)
*/mercurial/commandserver.py:* in _runworker (glob)
*/mercurial/commandserver.py:* in _serverequest (glob)
*/mercurial/commandserver.py:* in serve (glob)
*/mercurial/commandserver.py:* in serveone (glob)
*/mercurial/chgserver.py:* in runcommand (glob)
*/mercurial/commandserver.py:* in runcommand (glob)
*/mercurial/commandserver.py:* in _dispatchcommand (glob)
*/mercurial/dispatch.py:* in dispatch (glob)
*/mercurial/dispatch.py:* in _rundispatch (glob)
*/mercurial/dispatch.py:* in _runcatch (glob)
*/mercurial/dispatch.py:* in _callcatch (glob)
*/mercurial/scmutil.py:* in callcatch (glob)
*/mercurial/dispatch.py:* in _runcatchfunc (glob)
*/mercurial/dispatch.py:* in _dispatch (glob)
*/mercurial/dispatch.py:* in runcommand (glob)
*/mercurial/dispatch.py:* in _runcommand (glob)
*/mercurial/dispatch.py:* in <lambda> (glob)
*/mercurial/util.py:* in check (glob)
$TESTTMP/buggylocking.py:* in oldanddeprecated (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated --traceback exited 0 after * seconds (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> blackbox -l 7
#endif
#if pyoxidizer
$ hg blackbox -l 7
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at: $TESTTMP/buggylocking.py:* (oldanddeprecated) (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated exited 0 after * seconds (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated --traceback
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> devel-warn: foorbar is deprecated, go shopping
(compatibility will be dropped after Mercurial-42.1337, update your code.) at:
<string>:* in <module> (glob)
mercurial.dispatch:* in run (glob)
mercurial.dispatch:* in dispatch (glob)
mercurial.dispatch:* in _rundispatch (glob)
mercurial.dispatch:* in _runcatch (glob)
mercurial.dispatch:* in _callcatch (glob)
mercurial.scmutil* in callcatch (glob)
mercurial.dispatch:* in _runcatchfunc (glob)
mercurial.dispatch:* in _dispatch (glob)
mercurial.dispatch:* in runcommand (glob)
mercurial.dispatch:* in _runcommand (glob)
mercurial.dispatch:* in <lambda> (glob)
mercurial.util:* in check (glob)
$TESTTMP/buggylocking.py:* in oldanddeprecated (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> oldanddeprecated --traceback exited 0 after * seconds (glob)
1970-01-01 00:00:00.000 bob @cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b (5000)> blackbox -l 7
#endif
Test programming error failure:
$ hg buggytransaction 2>&1 | grep -E -v '^ '
** Unknown exception encountered with possibly-broken third-party extension "buggylocking" (version N/A)
** which supports versions unknown of Mercurial.
** Please disable "buggylocking" and try your action again.
** If that fixes the bug please report it to the extension author.
** Python * (glob)
** Mercurial Distributed SCM (*) (glob)
** Extensions loaded: * (glob)
** ProgrammingError: transaction requires locking
Traceback (most recent call last):
*ProgrammingError: transaction requires locking (glob)
$ hg programmingerror 2>&1 | grep -E -v '^ '
** Unknown exception encountered with possibly-broken third-party extension "buggylocking" (version N/A)
** which supports versions unknown of Mercurial.
** Please disable "buggylocking" and try your action again.
** If that fixes the bug please report it to the extension author.
** Python * (glob)
** Mercurial Distributed SCM (*) (glob)
** Extensions loaded: * (glob)
** ProgrammingError: something went wrong
** (try again)
Traceback (most recent call last):
*ProgrammingError: something went wrong (glob)
Old style deprecation warning
$ hg nouiwarning
$TESTTMP/buggylocking.py:*: DeprecationWarning: this is a test (glob)
(compatibility will be dropped after Mercurial-13.37, update your code.)
util.nouideprecwarn(b'this is a test', b'13.37')
(disabled outside of test run)
$ HGEMITWARNINGS= hg nouiwarning
Test warning on config option access and registration
$ cat << EOF > ${TESTTMP}/buggyconfig.py
> """A small extension that tests our developer warnings for config"""
>
> from mercurial import configitems, registrar
>
> cmdtable = {}
> command = registrar.command(cmdtable)
>
> configtable = {}
> configitem = registrar.configitem(configtable)
>
> configitem(b'test', b'some', default=b'foo')
> configitem(b'test', b'dynamic', default=configitems.dynamicdefault)
> configitem(b'test', b'callable', default=list)
> # overwrite a core config
> configitem(b'ui', b'quiet', default=False)
> configitem(b'ui', b'interactive', default=None)
>
> @command(b'buggyconfig')
> def cmdbuggyconfig(ui, repo):
> repo.ui.config(b'ui', b'quiet', True)
> repo.ui.config(b'ui', b'interactive', False)
> repo.ui.config(b'test', b'some', b'bar')
> repo.ui.config(b'test', b'some', b'foo')
> repo.ui.config(b'test', b'dynamic', b'some-required-default')
> repo.ui.config(b'test', b'dynamic')
> repo.ui.config(b'test', b'callable', [])
> repo.ui.config(b'test', b'callable', b'foo')
> repo.ui.config(b'test', b'unregistered')
> repo.ui.config(b'unregistered', b'unregistered')
> EOF
$ hg --config "extensions.buggyconfig=${TESTTMP}/buggyconfig.py" buggyconfig
devel-warn: extension 'buggyconfig' overwrites config item 'ui.interactive' at: */mercurial/extensions.py:* (_loadextra) (glob) (no-pyoxidizer !)
devel-warn: extension 'buggyconfig' overwrites config item 'ui.quiet' at: */mercurial/extensions.py:* (_loadextra) (glob) (no-pyoxidizer !)
devel-warn: extension 'buggyconfig' overwrites config item 'ui.interactive' at: mercurial.extensions:* (_loadextra) (glob) (pyoxidizer !)
devel-warn: extension 'buggyconfig' overwrites config item 'ui.quiet' at: mercurial.extensions:* (_loadextra) (glob) (pyoxidizer !)
devel-warn: specifying a mismatched default value for a registered config item: 'ui.quiet' 'True' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
devel-warn: specifying a mismatched default value for a registered config item: 'ui.interactive' 'False' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
devel-warn: specifying a mismatched default value for a registered config item: 'test.some' 'bar' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
devel-warn: config item requires an explicit default value: 'test.dynamic' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
devel-warn: specifying a mismatched default value for a registered config item: 'test.callable' 'foo' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
devel-warn: accessing unregistered config item: 'test.unregistered' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
devel-warn: accessing unregistered config item: 'unregistered.unregistered' at: $TESTTMP/buggyconfig.py:* (cmdbuggyconfig) (glob)
$ cd ..