Jc2k

Batching migrations

The idea here is that if you know which migrations were in version 2.0.3 of your project and which were in version 2.0.4 then setA - setB gives you the list of migrations you need to undo.

Django migrations give you a directed acyclic graph which describes how to get from the current database state to the target state. But there is no mechanism by which you can perform tasks like revert all the migrations that just ran in the last deployment.

Here is a quick recipe for batching Django migrations to allow you to do things like that.

Before you tag your project you do:

Jc2k

from gevent.monkey import patch_all
patch_all()

import json
import socket
import struct
import ssl
import logging
import uuid

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# https://raw.githubusercontent.com/pixelb/ps_mem/master/ps_mem.py
# https://people.gnome.org/~federico/misc/memstats.py
# http://brightbox.com/blog/2012/11/28/measuring-shared-ram-usage/

import itertools
import os
import operator

SUPPORTED_SMAPS_BUCKETS =  [
    'AnonHugePages', 'Anonymous', 'KernelPageSize', 'Locked',

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"""
This demo expects the following directory structure:

    /bundle/ - empty directory
    /library/
        /app1/
           RANDOM FILES
        /app2/
           RANDOM FILES
        /empty/

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import asyncio

from systemd import journal

class Journal(object):

    def __init__(self, unit):
        self.journal = journal.Reader()
        # self.journal.log_level(journal.LOG_INFO)
        self.journal.add_match(_SYSTEMD_UNIT=unit)

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import logger

log = logger.getLogger(__name__)

def log_calls(fn):
    def inner(*args, **kwargs):
        f = inspect.currentframe()
        frame, filename, line, func_name, lines, index = inspect.getouterframes(f)[1]
        args = inspect.getargvalues(f)

Jc2k

import requests
import json

issue = 104
branch = "BRANCH_TO_MERGE"
username = "USERNAME"
repo = "REPO"

url = "https://api.github.com/repos/%(username)s/%(repo)s/pulls" % locals()

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Keybase proof

I hereby claim:

• I am jc2k on github.
• I am jc2k (https://keybase.io/jc2k) on keybase.
• I have a public key whose fingerprint is A262 1F7E 9964 9468 FBE8 1555 EB27 AB01 4FB6 76F4

To claim this, I am signing this object:

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from pip.req import InstallRequirement, RequirementSet, parse_requirements
from pip.index import PackageFinder

import tempfile
import shutil

build_dir = tempfile.mkdtemp()
src_dir = tempfile.mkdtemp()
download_dir = tempfile.mkdtemp()

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import socket
if not hasattr(socket, "inet_pton"):  # pragma: no cover
    import ctypes

    WSAStringToAddressA = ctypes.windll.ws2_32.WSAStringToAddressA

    class sockaddr(ctypes.Structure):
        _fields_ = [
            ("sa_family", ctypes.c_short),
            ("__pad1", ctypes.c_ushort),