#29774: `django-admin shell` hangs if the user starts typing before shell is
ready
-------------------------------------+-------------------------------------
Reporter: Craig de | Owner: nobody
Stigter |
Type: Bug | Status: new
Component: Core | Version: master
(Management commands) |
Severity: Normal | Keywords: hang, shell
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
We have a large project with a fairly slow startup time:
{{{
$ time bash -c "echo 'pass' | django-admin shell"
real 0m5.596s
user 0m1.080s
sys 0m1.548s
}}}
As a habit, I tend to run `django-admin shell`, and while it's loading,
begin to type my first command.
Since upgrading from django 1.8 to 1.11, this causes the whole process to
hang with no output. After about 30s I notice and ctrl+C, but it's
incredibly frustrating:
{{{
$ django-admin shell
typing while i wait...
^CTraceback (most recent call last):
File "/kx/dandelion/venv/bin/django-admin", line 11, in <module>
sys.exit(execute_from_command_line())
File "/kx/dandelion/venv/local/lib/python2.7/site-
packages/django/core/management/__init__.py", line 364, in
execute_from_command_line
utility.execute()
File "/kx/dandelion/venv/local/lib/python2.7/site-
packages/django/core/management/__init__.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/kx/dandelion/venv/local/lib/python2.7/site-
packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/kx/dandelion/venv/local/lib/python2.7/site-
packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/kx/dandelion/venv/local/lib/python2.7/site-
packages/django/core/management/commands/shell.py", line 101, in handle
exec(sys.stdin.read())
KeyboardInterrupt
}}}
Multiple people on our team have experienced this.
It seems to happen if I manage to type at least one line before it loads.
If I just type a few characters not including a newline, the hang doesn't
occur.
I traced the issue to
[https://github.com/django/django/commit/bf6392bb7565c21f01ed6f682b8558dcf1cc8070
#diff-e38db80a1fef4134e3850b467d8d2344R127 this addition] in the django
1.10 release. It is still present in master.
--
Ticket URL: <https://code.djangoproject.com/ticket/29774>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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