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author Jeff Hammel <jhammel@mozilla.com>
date Fri, 10 May 2013 12:36:13 -0700
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1 Making your own cheeseshop
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2
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3 It is a common misconception that the cheeseshop (pypi.python.org) is
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4 *the* place to go for python packages. This is only true by
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5 convention. I won't go into the history of
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6 distutils/setuptools/distribute/pip packaging fiasco. Suffice it to
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7 say that (I hope) things are slowly converging and that both pip and
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8 easy_install, the two major ways of installing python software, both
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9 support a -i option to specify the URL of the package index (which is,
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10 by default http://pypi.python.org/simple).
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11
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12 In its base form, easy_install and pip just crawl links. You look at
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13 the base URL (see above) /<package>/<package>-<version>-<extension>
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14 and download this, unzip, run `python setup.py install` on it and
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15 you're done. So if you want to make a cheeseshop, there are two
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16 essential tasks:
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17
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18 1. Generating e.g. tarballs for a package and all of its dependencies
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19 2. Putting these tarballs on the web with some appropriate parent
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20 directory
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21
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22 Not rocket science...barely computer science, really.
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23
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24 For generating packages and their dependencies, I used pip. pip is
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25 really great for this. I only used the command line interface, though
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26 if I was smarter, I probably should have looked at the API and figured
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27 out what pip is doing internally and I could have avoided a few
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28 steps. Basically, using the --no-install option downloads the package
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29 and its dependencies for you and lets you do what you want with it.
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30
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31 I made a program for this, see http://k0s.org/hg/stampit . It's a
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32 python package, but it doesn't really do anything python-y. It was
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33 just easier to write than a shell script for my purposes. Basically
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34 it makes a virtualenv (probably overkill already), downloads the
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35 packages and their dependencies into it, runs `python setup.py sdist`
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36 on each package so that you have a source distribution, and prints out
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37 the location of each tarball.
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38
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39 The source distribution is very important as we want packages that
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40 will work independent of platform. These should. If they don't, we
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41 can make them.
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42
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43 So problem #1 solved. Let's move on to problem #2: putting them
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44 somewhere on the web.
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45
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46 Mozilla is so kind as to have given me a URL space on
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47 people.mozilla.org. Since easy_install and pip are really dumb and
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48 basically just crawl links, and since Apache is smart enough to
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49 generate index pages for directories that don't have index.html files
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50 in them, the hard part is already solved. I will note that
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51 people.mozilla.org is not intended as a permanant place for these
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52 tarballs, just an interim instance until we decide where we really
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53 want to put them.
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54
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55 Since I like to write scripts, I wrote a script that will run stampit
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56 and copy the resulting tarballs to a place appropriate to a
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57 cheeseshop. You can see the code here:
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58
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59 http://k0s.org/mozilla/package-it.sh
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60
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61 The variables are pretty specialized to my setup, but of course that's fixable.
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62
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63 Does it really work?
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64
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65 Yes! You can try it for yourself. Try:
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66
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67 ``easy_install -i http://people.mozilla.org/~jhammel/packages/ mozmill``
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68
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69 Watch where the links come from. Surprise! They're all from
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70 http://people.mozilla.org/~jhammel/packages/ !
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71 I would *highly advise* doing this (and just about everything else in
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72 python) in a virtualenv so that you don't pollute your global
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73 site-packages.
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74
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75 Why am I doing this?
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76
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77 The Firefox buildslaves are supposed to fetch data only from mozilla
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78 URLs for stability. So, if python packages need to be installed, they
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79 need to be available internal to Mozilla. If a package didn't have
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80 dependencies, then this is a no-brainer. But packages do have
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81 dependencies. Mozmill depends jsbridge, simplejson, and mozrunner.
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82 While this is a lot of work for just one package, if we want more
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83 python stuff in our buildbot tests, we'll need to do more of this, and
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84 I'd rather have a good solid methodology to do so. I also imagine
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85 this growing as a place to put all of our python packages for internal
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86 Mozilla needs.
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87
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88 I will note that I did this in a few hours from basically knowing the
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89 problem space but never having actually done it. None of this is
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90 supposed to be a clean and polished solution. But really, its not
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91 bad. We did something similar but less functional at my last job, The
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92 Open Planning Project, for similar reasons, so its not like I tackled
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93 this blindly. This is not as fully functional as the cheeseshop. A maintainer
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94 needs to run the package-it.sh script for each package (and its deps)
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95 they want installed. There's no accounts or any of the other features
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96 the cheeseshop has. But for a simple prototype and a way to move the
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97 discussion forward, its actually not that bad of a solution. There
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98 are more robust ways of really doing the cheeseshop, such as
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99 http://github.com/ask/chishop , but for a package dumping ground, this
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100 solution works and its really not even that hacky (in my opinion
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101 anyway).
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