author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
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1 |
Automatic Buildout Updates |
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2 |
========================== |
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3 |
|
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4 |
When a buildout is run, one of the first steps performed is to check |
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5 |
for updates to either zc.buildout or setuptools. To demonstrate this, |
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6 |
we've created some "new releases" of buildout and setuptools in a |
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7 |
new_releases folder: |
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8 |
|
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9 |
>>> ls(new_releases) |
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10 |
d setuptools |
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11 |
- setuptools-99.99-py2.4.egg |
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12 |
d zc.buildout |
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13 |
- zc.buildout-100.0b1-pyN.N.egg |
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14 |
- zc.buildout-99.99-py2.4.egg |
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15 |
|
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Let's update the sample buildout.cfg to look in this area: |
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17 |
|
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18 |
>>> write(sample_buildout, 'buildout.cfg', |
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19 |
... """ |
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20 |
... [buildout] |
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21 |
... find-links = %(new_releases)s |
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... index = %(new_releases)s |
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23 |
... parts = show-versions |
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24 |
... develop = showversions |
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25 |
... |
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26 |
... [show-versions] |
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27 |
... recipe = showversions |
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28 |
... """ % dict(new_releases=new_releases)) |
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29 |
|
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30 |
We'll also include a recipe that echos the versions of setuptools and |
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31 |
zc.buildout used: |
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32 |
|
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>>> mkdir(sample_buildout, 'showversions') |
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35 |
>>> write(sample_buildout, 'showversions', 'showversions.py', |
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36 |
... """ |
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37 |
... import pkg_resources |
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38 |
... |
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39 |
... class Recipe: |
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40 |
... |
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... def __init__(self, buildout, name, options): |
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... pass |
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... |
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... def install(self): |
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45 |
... for project in 'zc.buildout', 'setuptools': |
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46 |
... req = pkg_resources.Requirement.parse(project) |
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... print project, pkg_resources.working_set.find(req).version |
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... return () |
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... update = install |
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... """) |
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>>> write(sample_buildout, 'showversions', 'setup.py', |
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... """ |
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... from setuptools import setup |
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... |
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... setup( |
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... name = "showversions", |
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59 |
... entry_points = {'zc.buildout': ['default = showversions:Recipe']}, |
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... ) |
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... """) |
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Now if we run the buildout, the buildout will upgrade itself to the |
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65 |
new versions found in new releases: |
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|
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67 |
>>> print system(buildout), |
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68 |
Getting distribution for 'zc.buildout'. |
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69 |
Got zc.buildout 99.99. |
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70 |
Getting distribution for 'setuptools'. |
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71 |
Got setuptools 99.99. |
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72 |
Upgraded: |
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73 |
zc.buildout version 99.99, |
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74 |
setuptools version 99.99; |
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75 |
restarting. |
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76 |
Generated script '/sample-buildout/bin/buildout'. |
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77 |
Develop: '/sample-buildout/showversions' |
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78 |
Installing show-versions. |
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79 |
zc.buildout 99.99 |
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80 |
setuptools 99.99 |
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81 |
|
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82 |
Notice that, even though we have a newer beta version of zc.buildout |
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83 |
available, the final "99.99" was selected. If you want to get non-final |
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84 |
versions, specify a specific version in your buildout's versions |
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85 |
section, you typically want to use the --accept-buildout-test-releases |
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86 |
option to the bootstrap script, which internally uses the |
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87 |
``accept-buildout-test-releases = true`` discussed below. |
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88 |
|
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89 |
Our buildout script's site.py has been updated to use the new eggs: |
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90 |
|
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91 |
>>> cat(sample_buildout, 'parts', 'buildout', 'site.py') |
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92 |
... # doctest: +NORMALIZE_WHITESPACE +ELLIPSIS |
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93 |
"... |
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94 |
def addsitepackages(known_paths): |
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95 |
"""Add site packages, as determined by zc.buildout. |
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96 |
<BLANKLINE> |
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97 |
See original_addsitepackages, below, for the original version.""" |
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98 |
setuptools_path = '/sample-buildout/eggs/setuptools-99.99-pyN.N.egg' |
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99 |
sys.path.append(setuptools_path) |
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100 |
known_paths.add(os.path.normcase(setuptools_path)) |
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101 |
import pkg_resources |
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102 |
buildout_paths = [ |
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103 |
'/sample-buildout/eggs/zc.buildout-99.99-pyN.N.egg', |
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'/sample-buildout/eggs/setuptools-99.99-pyN.N.egg' |
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] |
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106 |
for path in buildout_paths: |
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107 |
sitedir, sitedircase = makepath(path) |
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108 |
if not sitedircase in known_paths and os.path.exists(sitedir): |
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109 |
sys.path.append(sitedir) |
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110 |
known_paths.add(sitedircase) |
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111 |
pkg_resources.working_set.add_entry(sitedir) |
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sys.__egginsert = len(buildout_paths) # Support setuptools. |
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113 |
original_paths = [ |
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... |
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115 |
] |
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for path in original_paths: |
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117 |
if path == setuptools_path or path not in known_paths: |
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118 |
addsitedir(path, known_paths) |
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119 |
return known_paths |
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120 |
... |
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121 |
|
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122 |
Now, let's recreate the sample buildout. If we specify constraints on |
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123 |
the versions of zc.buildout and setuptools (or distribute) to use, |
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124 |
running the buildout will install earlier versions of these packages: |
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125 |
|
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126 |
>>> write(sample_buildout, 'buildout.cfg', |
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127 |
... """ |
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128 |
... [buildout] |
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129 |
... find-links = %(new_releases)s |
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130 |
... index = %(new_releases)s |
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131 |
... parts = show-versions |
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132 |
... develop = showversions |
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133 |
... zc.buildout-version = < 99 |
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134 |
... setuptools-version = < 99 |
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135 |
... distribute-version = < 99 |
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136 |
... |
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137 |
... [show-versions] |
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138 |
... recipe = showversions |
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139 |
... """ % dict(new_releases=new_releases)) |
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140 |
|
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141 |
Now we can see that we actually "upgrade" to an earlier version. |
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142 |
|
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143 |
>>> print system(buildout), |
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144 |
Upgraded: |
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145 |
zc.buildout version 1.0.0, |
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146 |
setuptools version 0.6; |
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147 |
restarting. |
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148 |
Develop: '/sample-buildout/showversions' |
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149 |
Updating show-versions. |
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150 |
zc.buildout 1.0.0 |
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151 |
setuptools 0.6 |
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152 |
|
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153 |
There are a number of cases, described below, in which the updates |
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154 |
don't happen. |
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155 |
|
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156 |
We won't upgrade in offline mode: |
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157 |
|
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158 |
>>> write(sample_buildout, 'buildout.cfg', |
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159 |
... """ |
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160 |
... [buildout] |
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161 |
... find-links = %(new_releases)s |
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162 |
... index = %(new_releases)s |
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163 |
... parts = show-versions |
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164 |
... develop = showversions |
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165 |
... |
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166 |
... [show-versions] |
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167 |
... recipe = showversions |
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168 |
... """ % dict(new_releases=new_releases)) |
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169 |
|
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170 |
>>> print system(buildout+' -o'), |
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171 |
Develop: '/sample-buildout/showversions' |
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172 |
Updating show-versions. |
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173 |
zc.buildout 1.0.0 |
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174 |
setuptools 0.6 |
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175 |
|
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176 |
Or in non-newest mode: |
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177 |
|
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178 |
>>> print system(buildout+' -N'), |
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179 |
Develop: '/sample-buildout/showversions' |
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180 |
Updating show-versions. |
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181 |
zc.buildout 1.0.0 |
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182 |
setuptools 0.6 |
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183 |
|
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184 |
We also won't upgrade if the buildout script being run isn't in the |
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185 |
buildout's bin directory. To see this we'll create a new buildout |
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186 |
directory: |
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187 |
|
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188 |
>>> sample_buildout2 = tmpdir('sample_buildout2') |
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189 |
>>> write(sample_buildout2, 'buildout.cfg', |
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190 |
... """ |
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191 |
... [buildout] |
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192 |
... find-links = %(new_releases)s |
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193 |
... index = %(new_releases)s |
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194 |
... parts = |
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195 |
... """ % dict(new_releases=new_releases)) |
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196 |
|
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197 |
>>> cd(sample_buildout2) |
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198 |
>>> print system(buildout), |
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199 |
Creating directory '/sample_buildout2/bin'. |
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200 |
Creating directory '/sample_buildout2/parts'. |
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201 |
Creating directory '/sample_buildout2/eggs'. |
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202 |
Creating directory '/sample_buildout2/develop-eggs'. |
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203 |
Getting distribution for 'zc.buildout'. |
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204 |
Got zc.buildout 99.99. |
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205 |
Getting distribution for 'setuptools'. |
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206 |
Got setuptools 99.99. |
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207 |
Not upgrading because not running a local buildout command. |
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208 |
|
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209 |
>>> ls('bin') |
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210 |
|
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211 |
As mentioned above, the ``accept-buildout-test-releases = true`` means that |
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212 |
newer non-final versions of these dependencies are preferred. Typically |
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213 |
users are not expected to actually manipulate this value. Instead, the |
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214 |
bootstrap script creates a buildout buildout script that passes in the |
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215 |
value as a command line override. This then results in the buildout |
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216 |
script being rewritten to remember the decision. |
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217 |
|
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218 |
We'll mimic this by passing the argument actually in the command line. |
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219 |
|
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220 |
>>> cd(sample_buildout) |
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221 |
>>> write(sample_buildout, 'buildout.cfg', |
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222 |
... """ |
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223 |
... [buildout] |
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224 |
... find-links = %(new_releases)s |
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225 |
... index = %(new_releases)s |
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226 |
... parts = show-versions |
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227 |
... develop = showversions |
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228 |
... |
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229 |
... [show-versions] |
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230 |
... recipe = showversions |
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231 |
... """ % dict(new_releases=new_releases)) |
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232 |
|
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233 |
>>> print system(buildout + |
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234 |
... ' buildout:accept-buildout-test-releases=true'), |
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235 |
... # doctest: +NORMALIZE_WHITESPACE |
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236 |
Getting distribution for 'zc.buildout'. |
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Got zc.buildout 100.0b1. |
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Upgraded: |
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zc.buildout version 100.0b1, |
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setuptools version 99.99; |
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restarting. |
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Generated script '/sample-buildout/bin/buildout'. |
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NOTE: Accepting early releases of build system packages. Rerun bootstrap |
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without --accept-buildout-test-releases (-t) to return to default |
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behavior. |
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Develop: '/sample-buildout/showversions' |
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Updating show-versions. |
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zc.buildout 100.0b1 |
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setuptools 99.99 |
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|
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The buildout script shows the change. |
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|
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>>> buildout_script = join(sample_buildout, 'bin', 'buildout') |
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>>> import sys |
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>>> if sys.platform.startswith('win'): |
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... buildout_script += '-script.py' |
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>>> print open(buildout_script).read() # doctest: +ELLIPSIS |
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#... |
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sys.argv.insert(1, 'buildout:accept-buildout-test-releases=true') |
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print ('NOTE: Accepting early releases of build system packages. Rerun ' |
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'bootstrap without --accept-buildout-test-releases (-t) to return to ' |
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'default behavior.') |
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... |