tests/test-extension-timing.t

narrow: don't send the changelog information when widening without ellipses

When we widen anon-ellipses narrow copy, the server sends the changelog
information of all the changesets. The code was copied from ellipses case and in
ellipses cases, it's required to send the new changelog data.

But in non-ellipses cases, we don't need to send the changelog data as we will
have all the changesets locally.

Before this patch, there was a overhead of ~8-10 mins on each widening call
because of all the changelog information being pulled and being applied. After
this patch, we no more pull the changelog information. So this patch can save ~5
mins on Mozilla repo on each widening and more on repos which have more
changesets.

When we apply an empty changelog from changegroup, there is a devel-warn. This
patch kind of hacks to silence that devel-warn.

Differential Revision: https://phab.mercurial-scm.org/D4639

Test basic extension support

  $ cat > foobar.py <<EOF
  > import os
  > from mercurial import commands, registrar
  > cmdtable = {}
  > command = registrar.command(cmdtable)
  > configtable = {}
  > configitem = registrar.configitem(configtable)
  > configitem(b'tests', b'foo', default=b"Foo")
  > def uisetup(ui):
  >     ui.debug(b"uisetup called [debug]\\n")
  >     ui.write(b"uisetup called\\n")
  >     ui.status(b"uisetup called [status]\\n")
  >     ui.flush()
  > def reposetup(ui, repo):
  >     ui.write(b"reposetup called for %s\\n" % os.path.basename(repo.root))
  >     ui.write(b"ui %s= repo.ui\\n" % (ui == repo.ui and b"=" or b"!"))
  >     ui.flush()
  > @command(b'foo', [], b'hg foo')
  > def foo(ui, *args, **kwargs):
  >     foo = ui.config(b'tests', b'foo')
  >     ui.write(foo)
  >     ui.write(b"\\n")
  > @command(b'bar', [], b'hg bar', norepo=True)
  > def bar(ui, *args, **kwargs):
  >     ui.write(b"Bar\\n")
  > EOF
  $ abspath=`pwd`/foobar.py

  $ mkdir barfoo
  $ cp foobar.py barfoo/__init__.py
  $ barfoopath=`pwd`/barfoo

  $ hg init a
  $ cd a
  $ echo foo > file
  $ hg add file
  $ hg commit -m 'add file'

  $ echo '[extensions]' >> $HGRCPATH
  $ echo "foobar = $abspath" >> $HGRCPATH

Test extension setup timings

  $ hg foo --traceback --config devel.debug.extensions=yes --debug 2>&1
  debug.extensions: loading extensions
  debug.extensions: - processing 1 entries
  debug.extensions:   - loading extension: 'foobar'
  debug.extensions:   > 'foobar' extension loaded in * (glob)
  debug.extensions:     - validating extension tables: 'foobar'
  debug.extensions:     - invoking registered callbacks: 'foobar'
  debug.extensions:     > callbacks completed in * (glob)
  debug.extensions: > loaded 1 extensions, total time * (glob)
  debug.extensions: - loading configtable attributes
  debug.extensions: - executing uisetup hooks
  debug.extensions:   - running uisetup for 'foobar'
  uisetup called [debug]
  uisetup called
  uisetup called [status]
  debug.extensions:   > uisetup for 'foobar' took * (glob)
  debug.extensions: > all uisetup took * (glob)
  debug.extensions: - executing extsetup hooks
  debug.extensions:   - running extsetup for 'foobar'
  debug.extensions:   > extsetup for 'foobar' took * (glob)
  debug.extensions: > all extsetup took * (glob)
  debug.extensions: - executing remaining aftercallbacks
  debug.extensions: > remaining aftercallbacks completed in * (glob)
  debug.extensions: - loading extension registration objects
  debug.extensions: > extension registration object loading took * (glob)
  debug.extensions: > extension foobar take a total of * to load (glob)
  debug.extensions: extension loading complete
  debug.extensions: loading additional extensions
  debug.extensions: - processing 1 entries
  debug.extensions: > loaded 0 extensions, total time * (glob)
  debug.extensions: - loading configtable attributes
  debug.extensions: - executing uisetup hooks
  debug.extensions: > all uisetup took * (glob)
  debug.extensions: - executing extsetup hooks
  debug.extensions: > all extsetup took * (glob)
  debug.extensions: - executing remaining aftercallbacks
  debug.extensions: > remaining aftercallbacks completed in * (glob)
  debug.extensions: - loading extension registration objects
  debug.extensions: > extension registration object loading took * (glob)
  debug.extensions: extension loading complete
  debug.extensions: - executing reposetup hooks
  debug.extensions:   - running reposetup for foobar
  reposetup called for a
  ui == repo.ui
  debug.extensions:   > reposetup for 'foobar' took * (glob)
  debug.extensions: > all reposetup took * (glob)
  Foo

  $ cd ..

  $ echo 'foobar = !' >> $HGRCPATH