author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
c6bca38c1cbf
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1 |
Repeatable buildouts: controlling eggs used |
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2 |
=========================================== |
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3 |
|
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4 |
One of the goals of zc.buildout is to provide enough control to make |
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5 |
buildouts repeatable. It should be possible to check the buildout |
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6 |
configuration files for a project into a version control system and |
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7 |
later use the checked in files to get the same buildout, subject to |
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8 |
changes in the environment outside the buildout. |
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9 |
|
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10 |
An advantage of using Python eggs is that depenencies of eggs used are |
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11 |
automatically determined and used. The automatic inclusion of |
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12 |
depenent distributions is at odds with the goal of repeatable |
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13 |
buildouts. |
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14 |
|
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15 |
To support repeatable buildouts, a versions section can be created |
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16 |
with options for each distribution name whos version is to be fixed. |
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17 |
The section can then be specified via the buildout versions option. |
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18 |
|
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19 |
To see how this works, we'll create two versions of a recipe egg: |
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20 |
|
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21 |
>>> mkdir('recipe') |
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22 |
>>> write('recipe', 'recipe.py', |
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23 |
... ''' |
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24 |
... class Recipe: |
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25 |
... def __init__(*a): pass |
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26 |
... def install(self): |
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27 |
... print 'recipe v1' |
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28 |
... return () |
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29 |
... update = install |
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30 |
... ''') |
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31 |
|
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32 |
>>> write('recipe', 'setup.py', |
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33 |
... ''' |
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34 |
... from setuptools import setup |
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35 |
... setup(name='spam', version='1', py_modules=['recipe'], |
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36 |
... entry_points={'zc.buildout': ['default = recipe:Recipe']}, |
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37 |
... ) |
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38 |
... ''') |
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39 |
|
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40 |
>>> write('recipe', 'README', '') |
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41 |
|
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42 |
>>> print system(buildout+' setup recipe bdist_egg'), # doctest: +ELLIPSIS |
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43 |
Running setup script 'recipe/setup.py'. |
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44 |
... |
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45 |
|
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46 |
>>> rmdir('recipe', 'build') |
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47 |
|
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48 |
>>> write('recipe', 'recipe.py', |
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49 |
... ''' |
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50 |
... class Recipe: |
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51 |
... def __init__(*a): pass |
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52 |
... def install(self): |
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53 |
... print 'recipe v2' |
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54 |
... return () |
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55 |
... update = install |
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56 |
... ''') |
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57 |
|
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58 |
>>> write('recipe', 'setup.py', |
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59 |
... ''' |
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60 |
... from setuptools import setup |
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61 |
... setup(name='spam', version='2', py_modules=['recipe'], |
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62 |
... entry_points={'zc.buildout': ['default = recipe:Recipe']}, |
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63 |
... ) |
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64 |
... ''') |
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65 |
|
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66 |
|
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67 |
>>> print system(buildout+' setup recipe bdist_egg'), # doctest: +ELLIPSIS |
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68 |
Running setup script 'recipe/setup.py'. |
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69 |
... |
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70 |
|
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71 |
and we'll configure a buildout to use it: |
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72 |
|
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73 |
>>> write('buildout.cfg', |
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74 |
... ''' |
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75 |
... [buildout] |
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76 |
... parts = foo |
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77 |
... find-links = %s |
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78 |
... |
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79 |
... [foo] |
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80 |
... recipe = spam |
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81 |
... ''' % join('recipe', 'dist')) |
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82 |
|
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83 |
If we run the buildout, it will use version 2: |
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84 |
|
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85 |
>>> print system(buildout), |
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86 |
Getting distribution for 'spam'. |
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87 |
Got spam 2. |
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88 |
Installing foo. |
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89 |
recipe v2 |
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90 |
|
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91 |
We can specify a versions section that lists our recipe and name it in |
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92 |
the buildout section: |
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93 |
|
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94 |
>>> write('buildout.cfg', |
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95 |
... ''' |
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96 |
... [buildout] |
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97 |
... parts = foo |
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98 |
... find-links = %s |
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99 |
... versions = release-1 |
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100 |
... |
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101 |
... [release-1] |
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102 |
... spam = 1 |
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103 |
... eggs = 2.2 |
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104 |
... |
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105 |
... [foo] |
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106 |
... recipe = spam |
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107 |
... ''' % join('recipe', 'dist')) |
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108 |
|
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109 |
Here we created a release-1 section listing the version 1 for the spam |
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110 |
distribution. We told the buildout to use it by specifying release-1 |
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111 |
as in the versions option. |
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112 |
|
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113 |
Now, if we run the buildout, we'll use version 1 of the spam recipe: |
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114 |
|
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115 |
>>> print system(buildout), |
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116 |
Getting distribution for 'spam==1'. |
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117 |
Got spam 1. |
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118 |
Uninstalling foo. |
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119 |
Installing foo. |
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120 |
recipe v1 |
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Running the buildout in verbose mode will help us get information |
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about versions used. If we run the buildout in verbose mode without |
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specifying a versions section: |
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>>> print system(buildout+' buildout:versions= -v'), # doctest: +ELLIPSIS |
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Installing 'zc.buildout', 'setuptools'. |
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We have a develop egg: zc.buildout 1.0.0. |
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We have the best distribution that satisfies 'setuptools'. |
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Picked: setuptools = 0.6 |
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Installing 'spam'. |
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We have the best distribution that satisfies 'spam'. |
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Picked: spam = 2. |
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Uninstalling foo. |
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135 |
Installing foo. |
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136 |
recipe v2 |
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137 |
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We'll get output that includes lines that tell us what versions |
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buildout chose a for us, like:: |
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zc.buildout.easy_install.picked: spam = 2 |
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This allows us to discover versions that are picked dynamically, so |
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that we can fix them in a versions section. |
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If we run the buildout with the versions section: |
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>>> print system(buildout+' -v'), # doctest: +ELLIPSIS |
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Installing 'zc.buildout', 'setuptools'. |
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We have a develop egg: zc.buildout 1.0.0. |
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We have the best distribution that satisfies 'setuptools'. |
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Picked: setuptools = 0.6 |
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Installing 'spam'. |
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We have the distribution that satisfies 'spam==1'. |
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Uninstalling foo. |
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156 |
Installing foo. |
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157 |
recipe v1 |
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158 |
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We won't get output for the spam distribution, which we didn't pick, |
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but we will get output for setuptools, which we didn't specify |
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versions for. |
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You can request buildout to generate an error if it picks any |
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versions: |
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>>> write('buildout.cfg', |
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... ''' |
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... [buildout] |
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... parts = foo |
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... find-links = %s |
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... versions = release-1 |
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... allow-picked-versions = false |
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... |
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... [release-1] |
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... spam = 1 |
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... eggs = 2.2 |
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... |
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... [foo] |
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... recipe = spam |
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... ''' % join('recipe', 'dist')) |