#require no-chg

  $ filterlog () {

  >   sed -e 's!^[0-9/]* [0-9:]* ([0-9]*)>!YYYY/MM/DD HH:MM:SS (PID)>!'

  > }

ensure that failing ui.atexit handlers report sensibly

  $ cat > $TESTTMP/bailatexit.py <<EOF

  > from mercurial import util

  > def bail():

  >     raise RuntimeError('ui.atexit handler exception')

  > 

  > def extsetup(ui):

  >     ui.atexit(bail)

  > EOF

  $ hg -q --config extensions.bailatexit=$TESTTMP/bailatexit.py \

  >  help help

  hg help [-eck] [-s PLATFORM] [TOPIC]

  show help for a given topic or a help overview

  error in exit handlers:

  Traceback (most recent call last):

    File "*/mercurial/dispatch.py", line *, in _runexithandlers (glob) (no-pyoxidizer !)

    File "mercurial.dispatch", line *, in _runexithandlers (glob) (pyoxidizer !)

      func(*args, **kwargs)

    File "$TESTTMP/bailatexit.py", line *, in bail (glob)

      raise RuntimeError('ui.atexit handler exception')

  RuntimeError: ui.atexit handler exception

  [255]

  $ rm $TESTTMP/bailatexit.py

another bad extension

  $ echo 'raise Exception("bit bucket overflow")' > badext.py

  $ abspathexc=`pwd`/badext.py

  $ cat >baddocext.py <<EOF

  > """

  > baddocext is bad

  > """

  > EOF

  $ abspathdoc=`pwd`/baddocext.py

  $ cat <<EOF >> $HGRCPATH

  > [extensions]

  > gpg =

  > hgext.gpg =

  > badext = $abspathexc

  > baddocext = $abspathdoc

  > badext2 =

  > EOF

  $ hg -q help help 2>&1 |grep extension

  *** failed to import extension "badext" from $TESTTMP/badext.py: bit bucket overflow

  *** failed to import extension "badext2": No module named 'badext2' (py3 !)

show traceback

  $ hg -q help help --traceback 2>&1 | egrep ' extension|^Exception|Traceback|ImportError|ModuleNotFound'

  *** failed to import extension "badext" from $TESTTMP/badext.py: bit bucket overflow

  Traceback (most recent call last):

  Exception: bit bucket overflow

  *** failed to import extension "badext2": No module named 'badext2' (py3 !)

  Traceback (most recent call last):

  ImportError: No module named 'hgext.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext.badext2' (py36 !)

  Traceback (most recent call last): (py3 !)

  ImportError: No module named 'hgext3rd.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext3rd.badext2' (py36 !)

  Traceback (most recent call last): (py3 !)

  ImportError: No module named 'badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'badext2' (py36 !)

names of extensions failed to load can be accessed via extensions.notloaded()

  $ cat <<EOF > showbadexts.py

  > from mercurial import commands, extensions, registrar

  > cmdtable = {}

  > command = registrar.command(cmdtable)

  > @command(b'showbadexts', norepo=True)

  > def showbadexts(ui, *pats, **opts):

  >     ui.write(b'BADEXTS: %s\n' % b' '.join(sorted(extensions.notloaded())))

  > EOF

  $ hg --config extensions.badexts=showbadexts.py showbadexts 2>&1 | grep '^BADEXTS'

  BADEXTS: badext badext2

#if no-extraextensions

show traceback for ImportError of hgext.name if devel.debug.extensions is set

  $ (hg help help --traceback --debug --config devel.debug.extensions=yes 2>&1) \

  > | grep -v '^ ' \

  > | filterlog \

  > | egrep 'extension..[^p]|^Exception|Traceback|ImportError|^YYYY|not import|ModuleNotFound'

  YYYY/MM/DD HH:MM:SS (PID)> loading extensions

  YYYY/MM/DD HH:MM:SS (PID)> - processing 5 entries

  YYYY/MM/DD HH:MM:SS (PID)>   - loading extension: gpg

  YYYY/MM/DD HH:MM:SS (PID)>   > gpg extension loaded in * (glob)

  YYYY/MM/DD HH:MM:SS (PID)>     - validating extension tables: gpg

  YYYY/MM/DD HH:MM:SS (PID)>     - invoking registered callbacks: gpg

  YYYY/MM/DD HH:MM:SS (PID)>     > callbacks completed in * (glob)

  YYYY/MM/DD HH:MM:SS (PID)>   - loading extension: badext

  *** failed to import extension "badext" from $TESTTMP/badext.py: bit bucket overflow

  Traceback (most recent call last):

  Exception: bit bucket overflow

  YYYY/MM/DD HH:MM:SS (PID)>   - loading extension: baddocext

  YYYY/MM/DD HH:MM:SS (PID)>   > baddocext extension loaded in * (glob)

  YYYY/MM/DD HH:MM:SS (PID)>     - validating extension tables: baddocext

  YYYY/MM/DD HH:MM:SS (PID)>     - invoking registered callbacks: baddocext

  YYYY/MM/DD HH:MM:SS (PID)>     > callbacks completed in * (glob)

  YYYY/MM/DD HH:MM:SS (PID)>   - loading extension: badext2

  YYYY/MM/DD HH:MM:SS (PID)>     - could not import hgext.badext2 (No module named *badext2*): trying hgext3rd.badext2 (glob)

  Traceback (most recent call last):

  ImportError: No module named 'hgext.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext.badext2' (py36 !)

  YYYY/MM/DD HH:MM:SS (PID)>     - could not import hgext3rd.badext2 (No module named *badext2*): trying badext2 (glob)

  Traceback (most recent call last):

  ImportError: No module named 'hgext.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext.badext2' (py36 !)

  Traceback (most recent call last): (py3 !)

  ImportError: No module named 'hgext3rd.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext3rd.badext2' (py36 !)

  *** failed to import extension "badext2": No module named 'badext2' (py3 !)

  Traceback (most recent call last):

  ImportError: No module named 'hgext.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext.badext2' (py36 !)

  Traceback (most recent call last): (py3 !)

  ImportError: No module named 'hgext3rd.badext2' (py3 no-py36 !)

  ModuleNotFoundError: No module named 'hgext3rd.badext2' (py36 !)

  Traceback (most recent call last): (py3 !)

  ModuleNotFoundError: No module named 'badext2' (py36 !)

  ImportError: No module named 'badext2' (py3 no-py36 !)

  YYYY/MM/DD HH:MM:SS (PID)> > loaded 2 extensions, total time * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> - loading configtable attributes

  YYYY/MM/DD HH:MM:SS (PID)> - executing uisetup hooks

  YYYY/MM/DD HH:MM:SS (PID)>   - running uisetup for gpg

  YYYY/MM/DD HH:MM:SS (PID)>   > uisetup for gpg took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)>   - running uisetup for baddocext

  YYYY/MM/DD HH:MM:SS (PID)>   > uisetup for baddocext took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> > all uisetup took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> - executing extsetup hooks

  YYYY/MM/DD HH:MM:SS (PID)>   - running extsetup for gpg

  YYYY/MM/DD HH:MM:SS (PID)>   > extsetup for gpg took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)>   - running extsetup for baddocext

  YYYY/MM/DD HH:MM:SS (PID)>   > extsetup for baddocext took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> > all extsetup took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> - executing remaining aftercallbacks

  YYYY/MM/DD HH:MM:SS (PID)> > remaining aftercallbacks completed in * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> - loading extension registration objects

  YYYY/MM/DD HH:MM:SS (PID)> > extension registration object loading took * (glob)

  YYYY/MM/DD HH:MM:SS (PID)> > extension baddocext take a total of * to load (glob)

  YYYY/MM/DD HH:MM:SS (PID)> > extension gpg take a total of * to load (glob)

  YYYY/MM/DD HH:MM:SS (PID)> extension loading complete

#endif

confirm that there's no crash when an extension's documentation is bad

  $ hg help --keyword baddocext

  *** failed to import extension "badext" from $TESTTMP/badext.py: bit bucket overflow

  *** failed to import extension "badext2": No module named 'badext2' (py3 !)

  Topics:

   extensions Using Additional Features