subject:"\"\\\\\\\[Django\\\\\\\] #23406\\\\\\\: Migrations not found when only .pyc files are available \\\\\\\(e.g. in a frozen environment\\\\\\\)\""

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Ready for
  frozen, cx_Freeze  |  checkin
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Tim Graham):

 Would you like to offer a patch that reverts
 51673c146e48ff6230eace39bac18fd555607bee and makes the migration loader
 catch a `ImportError: bad magic number` exception and reraise it with a
 message that informs the user to delete pyc files?

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

Comment (by Dan Watson):

The only time I could see `.pyc` files hanging around is if you're sharing
a local copy of a third-party application between two different versions
of Python (i.e. `pip install -e` in both environments). And presumably the
main motivation behind the original decision to ignore `.pyc` files
(switching branches leaving stale files) does not apply nearly as much to
third-party apps you are using as code you are developing. But like
Carlton said, programming is weird and wonderful, so nothing would
surprise me.

I think the biggest "risk" in reverting
51673c146e48ff6230eace39bac18fd555607bee is for a project initially
switching to Python 3 (and Django 2.x), where the migrations directories
may already contain stale `.pyc` files. Seems like a documentation note
about clearing out `.pyc` files might be in order. If I'm not mistaken, we
have similar issues with templatetags - the templatetags loader uses
`pkgutil`:

https://github.com/django/django/blob/master/django/template/backends/django.py#L114

So I think a note about clearing out `.pyc` files is a good idea
regardless. Obviously I'm biased, but I think the fact that this has been
an issue for 3-4 years is not a good reason to wait 2 more years to rip
off the bandaid. Unless Django as a project decides it doesn't want to
officially "support" frozen/sourceless environments, which I think would
also be a shame, given how close it already is.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

Comment (by Tim Graham):

If third-party apps continue to support Python 2 until it's EOL in 2020,
then there's a possibility pyc files will be generated. If we revert
51673c146e48ff6230eace39bac18fd555607bee, then using a version of Django
that doesn't ignore pyc files will given an exception like `ImportError:
bad magic number in 'polls.migrations.0002_auto_20180312_1426':
b'\x03\xf3\r\n'` if a Python 2 pyc file is present. Manually removing pyc
files fixes that. If we decided to revert
51673c146e48ff6230eace39bac18fd555607bee for Django 2.1, I think it would
be useful to add a more helpful message about the magic number error
instructing the user to manually remove pyc files. I'm not sure if the
extra hassle in that use case is worth the trade off of supporting frozen
environments (assuming that Python 3 frozen environments generate pyc
files -- I'm not sure about this as I haven't used frozen environments
before).

By Django 3.1 (released August 2020), I think we can safely assume most
apps won't support Python 2, so we could revert the pyc ignoring in Django
without much concern. The `MIGRATIONS_INCLUDE_PYC` setting would allow
more easily using frozen environments in Django 2.1 (to be released August
2018), two years earlier than if we take the alternate route. Given the
problem is there since Django 1.7 (September 2014), I don't know if two
more years makes much difference.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

Comment (by Carlton Gibson):

The "some advantage" is in being able to ship a `.pyc` only version of you
code. This isn't something I've done but, reviewing the issue it seemed a
reasonable use-case. (The discussion ≈3 years ago didn't close...)

As far as I can see, in this Python 3 world you're only going to run into
this if you're deliberately creating the legacy `.pyc` files. In that case
you should already know what you're doing.
You're not going to hit anything that a `find . -name '*.pyc' -delete`
won't fix.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Ready for
  frozen, cx_Freeze  |  checkin
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Tim Graham):

 I also don't see the purpose of adding the setting at this point. If
 there's some advantage to reverting the ignoring of pyc files, then I'd
 rather do that now instead of adding a setting for it.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Ready for
  frozen, cx_Freeze  |  checkin
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Claude Paroz):

 Adding a new setting around `.pyc` files in Django 2.1 looks very
 outdated. I'm in favour of `won't fix`.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Ready for
  frozen, cx_Freeze  |  checkin
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Carlton Gibson):

 * stage:  Accepted => Ready for checkin


Comment:

 I don't want this one to slip through the cracks because of the revert
 /not-revert question.

 I've re-opened Dan's PR and marked it RFC. We should either merge it, or
 decide that reverting is OK (or close as `wontfix`).

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

Comment (by Carlton Gibson):

Replying to [comment:28 Tim Graham]:
> Is there a disadvantage to waiting to revert
51673c146e48ff6230eace39bac18fd555607bee until after Python 2 is end-of-
life in 2020? I'm not really sure, but ignoring of pyc files may still
have some value as long as third-party apps support Python 2 and 3.

I can't quite see how an issue would come up (given that this would go
into Django 2.1, which is Python 3 only) but I can't rule it out either.
(There's nothing so weird and wonderful as programming. :)

There's no disadvantage really. Dan's PR is clean enough. If we're not
going to revert 51673c14 (and not go for wontfix) I think we should re-
open the PR and treat it as Ready for checkin, for a final review from
you. (I was at the point of marking it so, bar the revert option coming
up.)

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Tim Graham):

 Is there a disadvantage to waiting to revert
 51673c146e48ff6230eace39bac18fd555607bee until after Python 2 is end-of-
 life in 2020? I'm not really sure, but ignoring of pyc files may still
 have some value as long as third-party apps  support Python 2 and 3.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Carlton Gibson):

 * has_patch:  1 => 0


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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Carlton Gibson):

 Dan can you close your existing PR and open a new one reverting the
 original change (explaining why that's OK now)?

 From there we'll mark that RFC and get Tim to make a final review.

 (We'll either revert, or say "no, lets take the patch", or failing that
 the only other option is `wontfix` — either way we'll get this one
 resolved.)

 Thanks!

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2018-03-07 Thread Django

Comment (by Dan Watson):

I'm actually in favor of reverting. Hadn't considered that now that Django
is Python 3 only. If you have legacy stale pyc files, it's because you
compiled them yourself now, which means you'd probably be using this
setting. So why have the setting at all :)

I wonder what Python 3 does when it sees a pyc file compiled with Python
2. That would be the only place I could see breakage for existing projects
with old Python 2 pyc files hanging around, but my guess is that they'd be
ignored (or fail loudly and hopefully obviously).

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2018-03-07 Thread Django

* cc: Carlton Gibson (added)

Comment:

The patch as presented, and given the history of the ticket, looks great.

Ref [comment:22 comment from Andrew Godwin]:
> ... there are no longer any .pyc files in the migrations directory (they
go into __pycache__) in Python 3 ...

So, maybe the original problem (of stale .pyc files when switching
branches) has gone away? They'll only be there if you've taken deliberate
steps to make sure they are.

So can we just load them? Do we still need the setting? Do we need the
warning around the setting? Could we not now revert

[https://github.com/django/django/commit/51673c146e48ff6230eace39bac18fd555607bee
51673c14], which was Andrew's commit restricting the search to just `.py`
files?

Assuming we don't want to revert, I'm inclined to call this Ready for
checkin.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

Comment (by Dan Watson):

It's true that by default, pyc files are compiled into `__pycache__`
directories, but there are explicit affordances made to import pyc files
that exist **in place of** the original py file. See
https://www.python.org/dev/peps/pep-3147/#case-4-legacy-pyc-files-and-
source-less-imports

This is the case for frozen or sourceless distributions. There are
switches in `compileall` to output legacy pyc files for this purpose (and
in fact this is what the unit test does). Whether frozen or sourceless
distributions are a good idea is a much more subjective and (seemingly)
controversial issue, but they are still possible, and this is how.

This setting is pretty narrow in scope, just to allow frozen distributions
(and is off by default with a warning in the docs about the problems it
may cause).

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by Andrew Godwin):

 Well, the problem we have these days is that there are no longer any .pyc
 files in the migrations directory (they go into __pycache__) in Python 3 -
 your patch does not seem to address this, so it'll never work unless
 people manually move them into place.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  Daniel Menzel|Owner:  Dan
 |  Watson
 Type:  Bug  |   Status:  assigned
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  1|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-
Changes (by Dan Watson):

 * cc: Dan Watson (added)


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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

* owner: nobody => Dan Watson
* status: new => assigned
* has_patch: 0 => 1

Comment:

Reviving this ticket a little bit. I think something like this can be
useful in container environments, where you can guarantee pyc files are
generated with the same python binary being used to run them, mitigating
most of the drawbacks listed in
https://www.curiousefficiency.org/posts/2011/04/benefits-and-limitations-
of-pyc-only.html (an oldie but a goodie).

Created a pull request for a new `MIGRATIONS_INCLUDE_PYC` setting,
complete with docs and tests:

https://github.com/django/django/pull/9718

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2017-03-06 Thread Django

Comment (by Dylan Young):

While I don't agree with the conclusion here (migration files *are*
explicitly imported when you run migrate; leftover .pyc files are a
tooling problem... think post checkout hooks), if this is the route to go
(and it's probably wise to do this anyways for other use-cases), I would
suggest that the setting to control this behaviour simply be
MIGRATION_LOADERS (as opposed to a tuple of extensions to support, for
example) and supply default loaders (.py, .pyc, archive) with hooks for
subclassing/creating new migration loaders. The setting would be a
tuple/list and the loaders would be consulted in list order (avoids the
need to mixin for every extension you want to support). This would also
allow things like a network loader for example.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-02-01 Thread Django

Comment (by carljm):

I understand the use case. (I would guess that none of your other six
dependencies have a situation with similar constraints to Django migration
files). As I said before, I'm in favor of a patch that would change your
case from "Django needs patching" to "Django needs a non-default
flag/setting." That's why this ticket is in Accepted state. It's just
waiting for a patch that implements it as a non-default option.

I also agree with Shai that a setting is more appropriate than a flag,
because this is a property of a deployment, not a particular invocation.

(There remains an open question about zipfiles, I guess. I have no problem
with supporting zip-import by default, but I'm not sure if it's possible
to do that without also supporting `.pyc` by default, which is
problematic.)

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-02-01 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by jdetaeye):

 Fair enough, I understand the arguments.

 My use case is somewhat different. I'm packaging my product with py2exe as
 an easy-to-install application (especially for Windows users).  Out of the
 7 python packages it needs, only Django needs patching to behave nicely in
 a frozen zip-file...

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-01-29 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by aaugustin):

 I agree with Carl.

 Arguments along the lines of "it's the user's problem" are a red flag when
 the problem is likely to affect the vast majority of users — in this case,
 everyone who uses a VCS and doesn't have `PYTHONDONTWRITEBYTECODE` set.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-01-29 Thread Django

Comment (by carljm):

Replying to [comment:14 jdetaeye]:
> IMHO, a migration is a python package just like any other, and should be
treated as such.

It's not a package like any other, because normal Python packages don't
have an effect on the system unless explicitly imported.

> If some development practices have an issue with that it's their problem
- not django's.

Your patch will cause serious, difficult to debug problems for any
development practice which involves adding and removing Python modules
(including migrations) from source code under local development, while
ignoring `pyc` files. (I know this is the case, because for a period of
time in the 1.7 development process, orphan `pyc` files were loaded as
migrations, and it did cause these problems.) I think you would be hard
pressed to find any current common Django development process that doesn't
fit that description.

If you have a practical proposal for how to address that problem (whether
with documentation changes or otherwise) in your patch, I'm interested in
discussing it. If you think it's "not Django's problem" and can be
ignored, I'm afraid we just disagree, and I have to remain -1 on merging
your patch.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-01-29 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by jdetaeye):

 For what it's worth, a patch is attached for this issue. It allows
 migrations in any package format to be picked up, be it zip, egg, file,
 ...

 > I think the practical hassles that causes to daily development with e.g.
 git branches outweigh the purity of using the proper Python API for module
 discovery."
 I don't agree with this comment.
 IMHO, a migration is a python package just like any other, and should be
 treated as such.If some development practices have an issue with that it's
 their problem - not django's.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-01-28 Thread Django

Comment (by carljm):

I'm not sure the fix for #8280 is actually appropriate here - I don't
believe that by default orphan `.pyc` files should be considered as
present migrations. I think the practical hassles that causes to daily
development with e.g. git branches outweigh the purity of using the proper
Python API for module discovery.

The distinction here is that usually the presence or absence of a module
that hasn't been explicitly requested doesn't fundamentally alter the
behavior of the system. With management commands, it does a bit (they'll
show up in help) but not in a way that's likely to break anything. Here,
having extra migrations around that shouldn't be around in this branch
seriously breaks things.

If we made migrations discover `.pyc` by default, we would basically have
to document that `PYTHONDONTWRITEBYTECODE=1` is required for effective
local development in Django.

I'm not opposed to an option to enable `.pyc` discovery, but I am opposed
to making it the default.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2015-01-28 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by jdetaeye):

 The Django commands had the same issue:  The code scanned for files in the
 folder with a certain extension, rather than using the proper Python API
 to peek inside the contents of the package.
 Please have a look at ticket #8280 and its resolution.

 6(!) years after reporting, this got fixed. And history repeats itself now
 with the migrations...

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2014-12-29 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |
Has patch:  0|  Needs documentation:  0
  Needs tests:  0|  Patch needs improvement:  0
Easy pickings:  0|UI/UX:  0
-+-

Comment (by andreydani):

 I agree a setting for the file extension would be better.

 I would like to use *.pyc on production (frozen) environments, but not
 when developing or testing.

 I have also made a small '''os.listdir''' replacement that searches for
 modules inside zip files.

 {{{
 def listdir(path):
 if not os.path.isdir(path):
 pos = path.lower().find('.zip')
 if pos >= 0:
 pos += 4
 zip = path[:pos]
 path_within = path[pos + 1:].replace('\\', '/')
 from zipfile import ZipFile
 zip = ZipFile(zip)
 return [a[len(path_within)+1:] for a in zip.namelist() if
 a.startswith(path_within)]
 return os.listdir(path)
 }}}

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2014-10-10 Thread Django

Comment (by shaib):

Yeah, the idea to add an app was mostly a way to do this in settings.py
without introducing a new setting.

So I take that back. But the main point remains: The determination of how
migrations are found is a property of the deployment, not a property of a
single invocation of migration commands. A setting is much better than a
flag.

On a related note, the setting should probably be more general than just
"use .pyc's". What about finding migrations in zip files? I can come up
with a couple of less likely candidates as well.

So yes, scratch the app overriding the commands. We need a setting to
specify the path to a migration loader, and we probably need to ship,
along with the standard loader, one which picks up .pyc files (and maybe
one which peeks in archives).

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2014-09-07 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by thedrow):

 +1 for --pyc. I think it's a good idea.
 Having to extend anything in the code in order to migrate on frozen
 environments seems like a bit too much work.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

2014-09-05 Thread Django

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by andrewgodwin):

 Well, there's definitely a call here to have the underlying implementation
 (i.e. `MigrationLoader`) take a list of extensions to allow, and then I
 think we may as well go the extra leg and add a --pyc flag; I'd hate to
 have people have to override the entire command just to get this
 behaviour.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

Comment (by shaib):

I think migrate and sqlmigrate are the only required ones for the use-case
(you don't generate or manipulate migrations in a frozen environment).

But I don't like the flag approach -- it essentially passes the problem
from the developer to their user.

I think the correct approach is an app that overrides ("enhances", if you
like) the built-in migration commands, in much the same way that South
enhanced `syncdb`. If it is hard to write as a 3rd-party app, we should
make the changes required to make it easy.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by andrewgodwin):

 If it was to work correctly, it would need to be passed to
 `makemigrations`, `migrate`, `sqlmigrate` and `squashmigrations`, but I
 suspect we could get away with just adding it to `migrate` and
 `sqlmigrate`? I'm still not sure about that, but seems better than a
 setting.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by danielmenzel):

 Or perhaps add the list of searched extensions as a class attribute, so
 that monkey-patching is made easier?

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by bmispelon):

 Can't we get away with an option passed to the command (something like
 `--pyc`)?

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by andrewgodwin):

 Well, we'd have to introduce a setting if we wanted to make this work (a
 la SOUTH_INCLUDE_PYC), and I'm somewhat averse to adding more settings
 than necessary. We definitely can't change the default behaviour back;
 people were seeing all sorts of bugs when switching branches due to .pyc
 files.

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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-

Comment (by carljm):

 The reason for the change was because treating an orphan `.pyc` as a real
 migration causes too many problems with things like switching branches in
 git.

 I think not looking for `.pyc` files is the right default behavior, but I
 wouldn't have any problem with some form of configurability to support
 things like cx_Freeze.

--
Ticket URL: 
Django 
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Re: [Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)

#23406: Migrations not found when only .pyc files are available (e.g. in a 
frozen
environment)
-+-
 Reporter:  danielmenzel |Owner:  nobody
 Type:  Bug  |   Status:  new
Component:  Migrations   |  Version:  1.7
 Severity:  Normal   |   Resolution:
 Keywords:  migrations, .pyc,| Triage Stage:  Accepted
  frozen, cx_Freeze  |  Needs documentation:  0
Has patch:  0|  Patch needs improvement:  0
  Needs tests:  0|UI/UX:  0
Easy pickings:  0|
-+-
Changes (by timgraham):

 * cc: andrewgodwin (added)
 * needs_docs:   => 0
 * needs_better_patch:   => 0
 * needs_tests:   => 0
 * stage:  Unreviewed => Accepted


Comment:

 I forget the reasoning, but I believe the decision was not to support
 frozen environments. We should at least document this.

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Ticket URL: 
Django 
The Web framework for perfectionists with deadlines.

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[Django] #23406: Migrations not found when only .pyc files are available (e.g. in a frozen environment)