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Commit e0aa402a authored by Jim Fulton's avatar Jim Fulton
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Removed some extra indentation that slipped in at some point

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src/zc/buildout/easy_install.txt
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......@@ -107,1218 +107,1218 @@ We have a link server that has a number of eggs:
<a href="other-1.0-py2.4.egg">other-1.0-py2.4.egg</a><br>
</body></html>
Let's make a directory and install the demo egg to it, using the demo:
>>> dest = tmpdir('sample-install')
>>> import zc.buildout.easy_install
>>> ws = zc.buildout.easy_install.install(
... ['demo==0.2'], dest,
... links=[link_server], index=link_server+'index/')
We requested version 0.2 of the demo distribution to be installed into
the destination server. We specified that we should search for links
on the link server and that we should use the (empty) link server
index directory as a package index.
The working set contains the distributions we retrieved.
>>> for dist in ws:
... print_(dist)
demo 0.2
demoneeded 1.1
We got demoneeded because it was a dependency of demo.
And the actual eggs were added to the eggs directory.
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
If we remove the version restriction on demo, but specify a false
value for newest, no new distributions will be installed:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... newest=False)
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
If we leave off the newest option, we'll get an update for demo:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/')
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.1-py2.4.egg
Note that we didn't get the newest versions available. There were
release candidates for newer versions of both packages. By default,
final releases are preferred. We can change this behavior using the
prefer_final function:
>>> zc.buildout.easy_install.prefer_final(False)
True
The old setting is returned.
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/')
>>> for dist in ws:
... print_(dist)
demo 0.4c1
demoneeded 1.2c1
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demo-0.4c1-py2.4.egg
d demoneeded-1.1-py2.4.egg
d demoneeded-1.2c1-py2.4.egg
Let's put the setting back to the default.
>>> zc.buildout.easy_install.prefer_final(True)
False
We can supply additional distributions. We can also supply
specifications for distributions that would normally be found via
dependencies. We might do this to specify a specific version.
>>> ws = zc.buildout.easy_install.install(
... ['demo', 'other', 'demoneeded==1.0'], dest,
... links=[link_server], index=link_server+'index/')
>>> for dist in ws:
... print_(dist)
demo 0.3
other 1.0
demoneeded 1.0
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demo-0.4c1-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d demoneeded-1.2c1-py2.4.egg
d other-1.0-py2.4.egg
>>> rmdir(dest)
Specifying version information independent of requirements
----------------------------------------------------------
Sometimes it's useful to specify version information independent of
normal requirements specifications. For example, a buildout may need
to lock down a set of versions, without having to put put version
numbers in setup files or part definitions. If a dictionary is passed
to the install function, mapping project names to version numbers,
then the versions numbers will be used.
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... versions = dict(demo='0.2', demoneeded='1.0'))
>>> [d.version for d in ws]
['0.2', '1.0']
In this example, we specified a version for demoneeded, even though we
didn't define a requirement for it. The versions specified apply to
dependencies as well as the specified requirements.
If we specify a version that's incompatible with a requirement, then
we'll get an error:
>>> from zope.testing.loggingsupport import InstalledHandler
>>> handler = InstalledHandler('zc.buildout.easy_install')
>>> import logging
>>> logging.getLogger('zc.buildout.easy_install').propagate = False
>>> ws = zc.buildout.easy_install.install(
... ['demo >0.2'], dest, links=[link_server],
... index=link_server+'index/',
... versions = dict(demo='0.2', demoneeded='1.0'))
Traceback (most recent call last):
...
IncompatibleVersionError: Bad version 0.2
>>> print_(handler)
zc.buildout.easy_install DEBUG
Installing 'demo >0.2'.
zc.buildout.easy_install ERROR
The version, 0.2, is not consistent with the requirement, 'demo>0.2'.
>>> handler.clear()
If no versions are specified, a debugging message will be output
reporting that a version was picked automatically:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
>>> print_(handler) # doctest: +ELLIPSIS
zc.buildout.easy_install DEBUG
Installing 'demo'.
zc.buildout.easy_install INFO
Getting distribution for 'demo'.
zc.buildout.easy_install INFO
Got demo 0.3.
zc.buildout.easy_install DEBUG
Picked: demo = 0.3
zc.buildout.easy_install DEBUG
Getting required 'demoneeded'
zc.buildout.easy_install DEBUG
required by demo 0.3.
zc.buildout.easy_install INFO
Getting distribution for 'demoneeded'.
zc.buildout.easy_install DEBUG
Running easy_install:...
zc.buildout.easy_install INFO
Got demoneeded 1.1.
zc.buildout.easy_install DEBUG
Picked: demoneeded = 1.1
zc.buildout.easy_install DEBUG
Installing 'demo'.
zc.buildout.easy_install DEBUG
We have the best distribution that satisfies 'demo'.
zc.buildout.easy_install DEBUG
Picked: demo = 0.3
zc.buildout.easy_install DEBUG
Getting required 'demoneeded'
zc.buildout.easy_install DEBUG
required by demo 0.3.
zc.buildout.easy_install DEBUG
We have the best distribution that satisfies 'demoneeded'.
zc.buildout.easy_install DEBUG
Picked: demoneeded = 1.1
>>> handler.uninstall()
>>> logging.getLogger('zc.buildout.easy_install').propagate = True
We can request that we get an error if versions are picked:
>>> zc.buildout.easy_install.allow_picked_versions(False)
True
(The old setting is returned.)
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
Traceback (most recent call last):
...
UserError: Picked: demo = 0.3
>>> zc.buildout.easy_install.allow_picked_versions(True)
False
The function default_versions can be used to get and set default
version information to be used when no version information is passes.
If called with an argument, it sets the default versions:
>>> zc.buildout.easy_install.default_versions(dict(demoneeded='1'))
... # doctest: +ELLIPSIS
{...}
It always returns the previous default versions. If called without an
argument, it simply returns the default versions without changing
them:
>>> zc.buildout.easy_install.default_versions()
{'demoneeded': '1'}
So with the default versions set, we'll get the requested version even
if the versions option isn't used:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
>>> [d.version for d in ws]
['0.3', '1.0']
Of course, we can unset the default versions by passing an empty
dictionary:
>>> zc.buildout.easy_install.default_versions({})
{'demoneeded': '1'}
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
>>> [d.version for d in ws]
['0.3', '1.1']
Dependency links
----------------
Setuptools allows metadata that describes where to search for package
dependencies. This option is called dependency_links. Buildout has its
own notion of where to look for dependencies, but it also uses the
setup tools dependency_links information if it's available.
Let's demo this by creating an egg that specifies dependency_links.
To begin, let's create a new egg repository. This repository hold a
newer version of the 'demoneeded' egg than the sample repository does.
>>> repoloc = tmpdir('repo')
>>> from zc.buildout.tests import create_egg
>>> create_egg('demoneeded', '1.2', repoloc)
>>> link_server2 = start_server(repoloc)
Turn on logging on this server so that we can see when eggs are pulled
from it.
Let's make a directory and install the demo egg to it, using the demo:
>>> dest = tmpdir('sample-install')
>>> import zc.buildout.easy_install
>>> ws = zc.buildout.easy_install.install(
... ['demo==0.2'], dest,
... links=[link_server], index=link_server+'index/')
We requested version 0.2 of the demo distribution to be installed into
the destination server. We specified that we should search for links
on the link server and that we should use the (empty) link server
index directory as a package index.
The working set contains the distributions we retrieved.
>>> for dist in ws:
... print_(dist)
demo 0.2
demoneeded 1.1
We got demoneeded because it was a dependency of demo.
And the actual eggs were added to the eggs directory.
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
If we remove the version restriction on demo, but specify a false
value for newest, no new distributions will be installed:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... newest=False)
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
If we leave off the newest option, we'll get an update for demo:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/')
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.1-py2.4.egg
Note that we didn't get the newest versions available. There were
release candidates for newer versions of both packages. By default,
final releases are preferred. We can change this behavior using the
prefer_final function:
>>> zc.buildout.easy_install.prefer_final(False)
True
The old setting is returned.
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/')
>>> for dist in ws:
... print_(dist)
demo 0.4c1
demoneeded 1.2c1
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demo-0.4c1-py2.4.egg
d demoneeded-1.1-py2.4.egg
d demoneeded-1.2c1-py2.4.egg
Let's put the setting back to the default.
>>> zc.buildout.easy_install.prefer_final(True)
False
We can supply additional distributions. We can also supply
specifications for distributions that would normally be found via
dependencies. We might do this to specify a specific version.
>>> ws = zc.buildout.easy_install.install(
... ['demo', 'other', 'demoneeded==1.0'], dest,
... links=[link_server], index=link_server+'index/')
>>> for dist in ws:
... print_(dist)
demo 0.3
other 1.0
demoneeded 1.0
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demo-0.4c1-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d demoneeded-1.2c1-py2.4.egg
d other-1.0-py2.4.egg
>>> rmdir(dest)
Specifying version information independent of requirements
----------------------------------------------------------
Sometimes it's useful to specify version information independent of
normal requirements specifications. For example, a buildout may need
to lock down a set of versions, without having to put put version
numbers in setup files or part definitions. If a dictionary is passed
to the install function, mapping project names to version numbers,
then the versions numbers will be used.
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... versions = dict(demo='0.2', demoneeded='1.0'))
>>> [d.version for d in ws]
['0.2', '1.0']
In this example, we specified a version for demoneeded, even though we
didn't define a requirement for it. The versions specified apply to
dependencies as well as the specified requirements.
If we specify a version that's incompatible with a requirement, then
we'll get an error:
>>> from zope.testing.loggingsupport import InstalledHandler
>>> handler = InstalledHandler('zc.buildout.easy_install')
>>> import logging
>>> logging.getLogger('zc.buildout.easy_install').propagate = False
>>> ws = zc.buildout.easy_install.install(
... ['demo >0.2'], dest, links=[link_server],
... index=link_server+'index/',
... versions = dict(demo='0.2', demoneeded='1.0'))
Traceback (most recent call last):
...
IncompatibleVersionError: Bad version 0.2
>>> print_(handler)
zc.buildout.easy_install DEBUG
Installing 'demo >0.2'.
zc.buildout.easy_install ERROR
The version, 0.2, is not consistent with the requirement, 'demo>0.2'.
>>> handler.clear()
If no versions are specified, a debugging message will be output
reporting that a version was picked automatically:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
>>> print_(handler) # doctest: +ELLIPSIS
zc.buildout.easy_install DEBUG
Installing 'demo'.
zc.buildout.easy_install INFO
Getting distribution for 'demo'.
zc.buildout.easy_install INFO
Got demo 0.3.
zc.buildout.easy_install DEBUG
Picked: demo = 0.3
zc.buildout.easy_install DEBUG
Getting required 'demoneeded'
zc.buildout.easy_install DEBUG
required by demo 0.3.
zc.buildout.easy_install INFO
Getting distribution for 'demoneeded'.
zc.buildout.easy_install DEBUG
Running easy_install:...
zc.buildout.easy_install INFO
Got demoneeded 1.1.
zc.buildout.easy_install DEBUG
Picked: demoneeded = 1.1
zc.buildout.easy_install DEBUG
Installing 'demo'.
zc.buildout.easy_install DEBUG
We have the best distribution that satisfies 'demo'.
zc.buildout.easy_install DEBUG
Picked: demo = 0.3
zc.buildout.easy_install DEBUG
Getting required 'demoneeded'
zc.buildout.easy_install DEBUG
required by demo 0.3.
zc.buildout.easy_install DEBUG
We have the best distribution that satisfies 'demoneeded'.
zc.buildout.easy_install DEBUG
Picked: demoneeded = 1.1
>>> handler.uninstall()
>>> logging.getLogger('zc.buildout.easy_install').propagate = True
We can request that we get an error if versions are picked:
>>> zc.buildout.easy_install.allow_picked_versions(False)
True
(The old setting is returned.)
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
Traceback (most recent call last):
...
UserError: Picked: demo = 0.3
>>> zc.buildout.easy_install.allow_picked_versions(True)
False
The function default_versions can be used to get and set default
version information to be used when no version information is passes.
If called with an argument, it sets the default versions:
>>> zc.buildout.easy_install.default_versions(dict(demoneeded='1'))
... # doctest: +ELLIPSIS
{...}
It always returns the previous default versions. If called without an
argument, it simply returns the default versions without changing
them:
>>> zc.buildout.easy_install.default_versions()
{'demoneeded': '1'}
So with the default versions set, we'll get the requested version even
if the versions option isn't used:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
>>> [d.version for d in ws]
['0.3', '1.0']
Of course, we can unset the default versions by passing an empty
dictionary:
>>> zc.buildout.easy_install.default_versions({})
{'demoneeded': '1'}
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest, links=[link_server], index=link_server+'index/',
... )
>>> [d.version for d in ws]
['0.3', '1.1']
Dependency links
----------------
Setuptools allows metadata that describes where to search for package
dependencies. This option is called dependency_links. Buildout has its
own notion of where to look for dependencies, but it also uses the
setup tools dependency_links information if it's available.
Let's demo this by creating an egg that specifies dependency_links.
To begin, let's create a new egg repository. This repository hold a
newer version of the 'demoneeded' egg than the sample repository does.
>>> repoloc = tmpdir('repo')
>>> from zc.buildout.tests import create_egg
>>> create_egg('demoneeded', '1.2', repoloc)
>>> link_server2 = start_server(repoloc)
Turn on logging on this server so that we can see when eggs are pulled
from it.
>>> _ = get(link_server2 + 'enable_server_logging')
GET 200 /enable_server_logging
>>> _ = get(link_server2 + 'enable_server_logging')
GET 200 /enable_server_logging
Now we can create an egg that specifies that its dependencies are
found on this server.
Now we can create an egg that specifies that its dependencies are
found on this server.
>>> repoloc = tmpdir('repo2')
>>> create_egg('hasdeps', '1.0', repoloc,
... install_requires = "'demoneeded'",
... dependency_links = [link_server2])
>>> repoloc = tmpdir('repo2')
>>> create_egg('hasdeps', '1.0', repoloc,
... install_requires = "'demoneeded'",
... dependency_links = [link_server2])
Let's add the egg to another repository.
Let's add the egg to another repository.
>>> link_server3 = start_server(repoloc)
>>> link_server3 = start_server(repoloc)
Now let's install the egg.
Now let's install the egg.
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest,
... links=[link_server3], index=link_server3+'index/')
GET 200 /
GET 200 /demoneeded-1.2-pyN.N.egg
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest,
... links=[link_server3], index=link_server3+'index/')
GET 200 /
GET 200 /demoneeded-1.2-pyN.N.egg
The server logs show that the dependency was retrieved from the server
specified in the dependency_links.
The server logs show that the dependency was retrieved from the server
specified in the dependency_links.
Now let's see what happens if we provide two different ways to retrieve
the dependencies.
Now let's see what happens if we provide two different ways to retrieve
the dependencies.
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3])
GET 200 /
GET 200 /demoneeded-1.2-pyN.N.egg
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3])
GET 200 /
GET 200 /demoneeded-1.2-pyN.N.egg
Once again the dependency is fetched from the logging server even
though it is also available from the non-logging server. This is
because the version on the logging server is newer and buildout
normally chooses the newest egg available.
Once again the dependency is fetched from the logging server even
though it is also available from the non-logging server. This is
because the version on the logging server is newer and buildout
normally chooses the newest egg available.
If you wish to control where dependencies come from regardless of
dependency_links setup metadata use the 'use_dependency_links' option
to zc.buildout.easy_install.install().
If you wish to control where dependencies come from regardless of
dependency_links setup metadata use the 'use_dependency_links' option
to zc.buildout.easy_install.install().
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3],
... use_dependency_links=False)
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3],
... use_dependency_links=False)
Notice that this time the dependency egg is not fetched from the
logging server. When you specify not to use dependency_links, eggs
will only be searched for using the links you explicitly provide.
Notice that this time the dependency egg is not fetched from the
logging server. When you specify not to use dependency_links, eggs
will only be searched for using the links you explicitly provide.
Another way to control this option is with the
zc.buildout.easy_install.use_dependency_links() function. This
function sets the default behavior for the zc.buildout.easy_install()
function.
Another way to control this option is with the
zc.buildout.easy_install.use_dependency_links() function. This
function sets the default behavior for the zc.buildout.easy_install()
function.
>>> zc.buildout.easy_install.use_dependency_links(False)
True
>>> zc.buildout.easy_install.use_dependency_links(False)
True
The function returns its previous setting.
The function returns its previous setting.
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3])
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3])
It can be overridden by passing a keyword argument to the install
function.
It can be overridden by passing a keyword argument to the install
function.
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3],
... use_dependency_links=True)
GET 200 /demoneeded-1.2-pyN.N.egg
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3],
... use_dependency_links=True)
GET 200 /demoneeded-1.2-pyN.N.egg
To return the dependency_links behavior to normal call the function again.
To return the dependency_links behavior to normal call the function again.
>>> zc.buildout.easy_install.use_dependency_links(True)
False
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3])
GET 200 /demoneeded-1.2-pyN.N.egg
>>> zc.buildout.easy_install.use_dependency_links(True)
False
>>> rmdir(example_dest)
>>> example_dest = tmpdir('example-install')
>>> workingset = zc.buildout.easy_install.install(
... ['hasdeps'], example_dest, index=link_server+'index/',
... links=[link_server, link_server3])
GET 200 /demoneeded-1.2-pyN.N.egg
Script generation
-----------------
Script generation
-----------------
The easy_install module provides support for creating scripts from
eggs. It provides a function similar to setuptools except that it
provides facilities for baking a script's path into the script. This
has two advantages:
The easy_install module provides support for creating scripts from
eggs. It provides a function similar to setuptools except that it
provides facilities for baking a script's path into the script. This
has two advantages:
- The eggs to be used by a script are not chosen at run time, making
startup faster and, more importantly, deterministic.
- The eggs to be used by a script are not chosen at run time, making
startup faster and, more importantly, deterministic.
- The script doesn't have to import pkg_resources because the logic
that pkg_resources would execute at run time is executed at
script-creation time.
- The script doesn't have to import pkg_resources because the logic
that pkg_resources would execute at run time is executed at
script-creation time.
The scripts method can be used to generate scripts. Let's create a
destination directory for it to place them in:
>>> import tempfile
>>> bin = tmpdir('bin')
Now, we'll use the scripts method to generate scripts in this directory
from the demo egg:
The scripts method can be used to generate scripts. Let's create a
destination directory for it to place them in:
>>> import tempfile
>>> bin = tmpdir('bin')
Now, we'll use the scripts method to generate scripts in this directory
from the demo egg:
>>> import sys
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin)
>>> import sys
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin)
the three arguments we passed were:
the three arguments we passed were:
1. A sequence of distribution requirements. These are of the same
form as setuptools requirements. Here we passed a single
requirement, for the version 0.1 demo distribution.
2. A working set,
3. The destination directory.
The bin directory now contains a generated script:
>>> ls(bin)
- demo
The return value is a list of the scripts generated:
>>> import os, sys
>>> if sys.platform == 'win32':
... scripts == [os.path.join(bin, 'demo.exe'),
... os.path.join(bin, 'demo-script.py')]
... else:
... scripts == [os.path.join(bin, 'demo')]
True
Note that in Windows, 2 files are generated for each script. A script
file, ending in '-script.py', and an exe file that allows the script
to be invoked directly without having to specify the Python
interpreter and without having to provide a '.py' suffix.
The demo script run the entry point defined in the demo egg:
>>> cat(bin, 'demo') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Some things to note:
- The demo and demoneeded eggs are added to the beginning of sys.path.
- The module for the script entry point is imported and the entry
point, in this case, 'main', is run.
Rather than requirement strings, you can pass tuples containing 3
strings:
- A script name,
- A module,
- An attribute expression for an entry point within the module.
For example, we could have passed entry point information directly
rather than passing a requirement:
>>> scripts = zc.buildout.easy_install.scripts(
... [('demo', 'eggrecipedemo', 'main')], ws,
... sys.executable, bin)
>>> cat(bin, 'demo') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Passing entry-point information directly is handy when using eggs (or
distributions) that don't declare their entry points, such as
distributions that aren't based on setuptools.
The interpreter keyword argument can be used to generate a script that can
be used to invoke the Python interactive interpreter with the path set
based on the working set. This generated script can also be used to
run other scripts with the path set on the working set:
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, interpreter='py')
>>> ls(bin)
- demo
- py
>>> if sys.platform == 'win32':
... scripts == [os.path.join(bin, 'demo.exe'),
... os.path.join(bin, 'demo-script.py'),
... os.path.join(bin, 'py.exe'),
... os.path.join(bin, 'py-script.py')]
... else:
... scripts == [os.path.join(bin, 'demo'),
... os.path.join(bin, 'py')]
True
The py script simply runs the Python interactive interpreter with
the path set:
>>> cat(bin, 'py') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
<BLANKLINE>
sys.path[0:0] = [
'/sample-install/demo-0.3-pyN.N.egg',
'/sample-install/demoneeded-1.1-pyN.N.egg',
]
<BLANKLINE>
_interactive = True
if len(sys.argv) > 1:
_options, _args = __import__("getopt").getopt(sys.argv[1:], 'ic:m:')
_interactive = False
for (_opt, _val) in _options:
if _opt == '-i':
_interactive = True
elif _opt == '-c':
exec(_val)
elif _opt == '-m':
sys.argv[1:] = _args
_args = []
__import__("runpy").run_module(
_val, {}, "__main__", alter_sys=True)
<BLANKLINE>
if _args:
sys.argv[:] = _args
__file__ = _args[0]
del _options, _args
__file__f = open(__file__)
exec(compile(__file__f.read(), __file__, "exec"))
__file__f.close(); del __file__f
<BLANKLINE>
if _interactive:
del _interactive
__import__("code").interact(banner="", local=globals())
If invoked with a script name and arguments, it will run that script, instead.
>>> write('ascript', r'''
... "demo doc"
... import sys
... print_ = lambda *a: sys.stdout.write(' '.join(map(str, a))+'\n')
... print_(sys.argv)
... print_((__name__, __file__, __doc__))
... ''')
>>> print_(system(join(bin, 'py')+' ascript a b c'), end='')
['ascript', 'a', 'b', 'c']
('__main__', 'ascript', 'demo doc')
For Python 2.5 and higher, you can also use the -m option to run a
module:
>>> if sys.version_info < (2, 5):
... print ('usage: pdb.py blah blah blah')
... else:
... print_(system(join(bin, 'py')+' -m pdb'), end='')
... # doctest: +ELLIPSIS
usage: pdb.py ...
>>> print_(system(join(bin, 'py')+' -m pdb what'), end='')
Error: what does not exist
An additional argument can be passed to define which scripts to install
and to provide script names. The argument is a dictionary mapping
original script names to new script names.
>>> bin = tmpdir('bin2')
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'))
>>> if sys.platform == 'win32':
... scripts == [os.path.join(bin, 'run.exe'),
... os.path.join(bin, 'run-script.py')]
... else:
... scripts == [os.path.join(bin, 'run')]
True
>>> ls(bin)
- run
>>> print_(system(os.path.join(bin, 'run')), end='')
3 1
Including extra paths in scripts
--------------------------------
We can pass a keyword argument, extra paths, to cause additional paths
to be included in the a generated script:
>>> foo = tmpdir('foo')
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'),
... extra_paths=[foo])
>>> cat(bin, 'run') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
'/foo',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Providing script arguments
--------------------------
An "argument" keyword argument can be used to pass arguments to an
entry point. The value passed is a source string to be placed between the
parentheses in the call:
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'),
... arguments='1, 2')
>>> cat(bin, 'run') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main(1, 2))
Passing initialization code
---------------------------
You can also pass script initialization code:
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'),
... arguments='1, 2',
... initialization='import os\nos.chdir("foo")')
>>> cat(bin, 'run') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import os
os.chdir("foo")
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main(1, 2))
Relative paths
--------------
Sometimes, you want to be able to move a buildout directory around and
have scripts still work without having to rebuild them. We can
control this using the relative_paths option to install. You need
to pass a common base directory of the scripts and eggs:
>>> bo = tmpdir('bo')
>>> ba = tmpdir('ba')
>>> mkdir(bo, 'eggs')
>>> mkdir(bo, 'bin')
>>> mkdir(bo, 'other')
>>> ws = zc.buildout.easy_install.install(
... ['demo'], join(bo, 'eggs'), links=[link_server],
... index=link_server+'index/')
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, join(bo, 'bin'), dict(demo='run'),
... extra_paths=[ba, join(bo, 'bar')],
... interpreter='py',
... relative_paths=bo)
>>> cat(bo, 'bin', 'run')
#!/usr/local/bin/python2.7
<BLANKLINE>
import os
<BLANKLINE>
join = os.path.join
base = os.path.dirname(os.path.abspath(os.path.realpath(__file__)))
base = os.path.dirname(base)
<BLANKLINE>
import sys
sys.path[0:0] = [
join(base, 'eggs/demo-0.3-pyN.N.egg'),
join(base, 'eggs/demoneeded-1.1-pyN.N.egg'),
'/ba',
join(base, 'bar'),
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Note that the extra path we specified that was outside the directory
passed as relative_paths wasn't converted to a relative path.
Of course, running the script works:
>>> print_(system(join(bo, 'bin', 'run')), end='')
3 1
We specified an interpreter and its paths are adjusted too:
>>> cat(bo, 'bin', 'py')
#!/usr/local/bin/python2.7
<BLANKLINE>
import os
<BLANKLINE>
join = os.path.join
base = os.path.dirname(os.path.abspath(os.path.realpath(__file__)))
base = os.path.dirname(base)
<BLANKLINE>
import sys
<BLANKLINE>
sys.path[0:0] = [
join(base, 'eggs/demo-0.3-pyN.N.egg'),
join(base, 'eggs/demoneeded-1.1-pyN.N.egg'),
'/ba',
join(base, 'bar'),
]
<BLANKLINE>
_interactive = True
if len(sys.argv) > 1:
_options, _args = __import__("getopt").getopt(sys.argv[1:], 'ic:m:')
_interactive = False
for (_opt, _val) in _options:
if _opt == '-i':
_interactive = True
elif _opt == '-c':
exec(_val)
elif _opt == '-m':
sys.argv[1:] = _args
_args = []
__import__("runpy").run_module(
_val, {}, "__main__", alter_sys=True)
<BLANKLINE>
if _args:
sys.argv[:] = _args
__file__ = _args[0]
del _options, _args
__file__f = open(__file__)
exec(compile(__file__f.read(), __file__, "exec"))
__file__f.close(); del __file__f
<BLANKLINE>
if _interactive:
del _interactive
__import__("code").interact(banner="", local=globals())
Installing distutils-style scripts
----------------------------------
Most python libraries use the console_scripts entry point nowadays. But
several still have a ``scripts=['bin/something']`` in their setup() call.
Buildout also installs those:
>>> distdir = tmpdir('distutilsscriptdir')
>>> distbin = tmpdir('distutilsscriptbin')
>>> ws = zc.buildout.easy_install.install(
... ['other'], distdir,
... links=[link_server], index=link_server+'index/')
>>> scripts = zc.buildout.easy_install.scripts(
... ['other'], ws, sys.executable, distbin)
>>> ls(distbin)
- distutilsscript
It also works for zipped eggs:
>>> distdir2 = tmpdir('distutilsscriptdir2')
>>> distbin2 = tmpdir('distutilsscriptbin2')
>>> ws = zc.buildout.easy_install.install(
... ['du_zipped'], distdir2,
... links=[link_server], index=link_server+'index/')
>>> scripts = zc.buildout.easy_install.scripts(
... ['du_zipped'], ws, sys.executable, distbin2)
>>> ls(distbin2)
- distutilsscript
Distutils copies the script files verbatim, apart from a line at the top that
looks like ``#!/usr/bin/python``, which gets replaced by the actual python
interpreter. Buildout does the same, but additionally also adds the sys.path
like for the console_scripts:
>>> cat(distbin, 'distutilsscript')
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/distutilsscriptdir/other-1.0-pyN.N.egg',
]
<BLANKLINE>
<BLANKLINE>
import sys; sys.stdout.write("distutils!\n")
Due to the nature of distutils scripts, buildout cannot pass arguments as
there's no specific method to pass them to.
Handling custom build options for extensions provided in source distributions
-----------------------------------------------------------------------------
Sometimes, we need to control how extension modules are built. The
build function provides this level of control. It takes a single
package specification, downloads a source distribution, and builds it
with specified custom build options.
The build function takes 3 positional arguments:
spec
A package specification for a source distribution
dest
A destination directory
build_ext
A dictionary of options to be passed to the distutils build_ext
command when building extensions.
It supports a number of optional keyword arguments:
links
a sequence of URLs, file names, or directories to look for
links to distributions,
index
The URL of an index server, or almost any other valid URL. :)
If not specified, the Python Package Index,
http://pypi.python.org/simple/, is used. You can specify an
alternate index with this option. If you use the links option and
if the links point to the needed distributions, then the index can
be anything and will be largely ignored. In the examples, here,
we'll just point to an empty directory on our link server. This
will make our examples run a little bit faster.
path
A list of additional directories to search for locally-installed
distributions.
newest
A boolean value indicating whether to search for new distributions
when already-installed distributions meet the requirement. When
this is true, the default, and when the destination directory is
not None, then the install function will search for the newest
distributions that satisfy the requirements.
versions
A dictionary mapping project names to version numbers to be used
when selecting distributions. This can be used to specify a set of
distribution versions independent of other requirements.
Our link server included a source distribution that includes a simple
extension, extdemo.c::
#include <Python.h>
#include <extdemo.h>
static PyMethodDef methods[] = {};
PyMODINIT_FUNC
initextdemo(void)
{
PyObject *m;
m = Py_InitModule3("extdemo", methods, "");
#ifdef TWO
PyModule_AddObject(m, "val", PyInt_FromLong(2));
#else
PyModule_AddObject(m, "val", PyInt_FromLong(EXTDEMO));
#endif
}
The extension depends on a system-dependent include file, extdemo.h,
that defines a constant, EXTDEMO, that is exposed by the extension.
We'll add an include directory to our sample buildout and add the
needed include file to it:
>>> mkdir('include')
>>> write('include', 'extdemo.h',
... """
... #define EXTDEMO 42
... """)
Now, we can use the build function to create an egg from the source
distribution:
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
['/sample-install/extdemo-1.4-py2.4-unix-i686.egg']
The function returns the list of eggs
Now if we look in our destination directory, we see we have an extdemo egg:
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.4-py2.4-unix-i686.egg
Let's update our link server with a new version of extdemo:
>>> update_extdemo()
>>> print_(get(link_server), end='')
<html><body>
<a href="bigdemo-0.1-py2.4.egg">bigdemo-0.1-py2.4.egg</a><br>
<a href="demo-0.1-py2.4.egg">demo-0.1-py2.4.egg</a><br>
<a href="demo-0.2-py2.4.egg">demo-0.2-py2.4.egg</a><br>
<a href="demo-0.3-py2.4.egg">demo-0.3-py2.4.egg</a><br>
<a href="demo-0.4c1-py2.4.egg">demo-0.4c1-py2.4.egg</a><br>
<a href="demoneeded-1.0.zip">demoneeded-1.0.zip</a><br>
<a href="demoneeded-1.1.zip">demoneeded-1.1.zip</a><br>
<a href="demoneeded-1.2c1.zip">demoneeded-1.2c1.zip</a><br>
<a href="du_zipped-1.0-pyN.N.egg">du_zipped-1.0-pyN.N.egg</a><br>
<a href="extdemo-1.4.zip">extdemo-1.4.zip</a><br>
<a href="extdemo-1.5.zip">extdemo-1.5.zip</a><br>
<a href="index/">index/</a><br>
<a href="other-1.0-py2.4.egg">other-1.0-py2.4.egg</a><br>
</body></html>
The easy_install caches information about servers to reduce network
access. To see the update, we have to call the clear_index_cache
function to clear the index cache:
>>> zc.buildout.easy_install.clear_index_cache()
If we run build with newest set to False, we won't get an update:
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/',
... newest=False)
['/sample-install/extdemo-1.4-py2.4-linux-i686.egg']
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.4-py2.4-unix-i686.egg
But if we run it with the default True setting for newest, then we'll
get an updated egg:
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
['/sample-install/extdemo-1.5-py2.4-unix-i686.egg']
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.4-py2.4-unix-i686.egg
d extdemo-1.5-py2.4-unix-i686.egg
The versions option also influences the versions used. For example,
if we specify a version for extdemo, then that will be used, even
though it isn't the newest. Let's clean out the destination directory
first:
>>> import os
>>> for name in os.listdir(dest):
... remove(dest, name)
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/',
... versions=dict(extdemo='1.4'))
['/sample-install/extdemo-1.4-py2.4-unix-i686.egg']
>>> ls(dest)
d extdemo-1.4-py2.4-unix-i686.egg
Handling custom build options for extensions in develop eggs
------------------------------------------------------------
The develop function is similar to the build function, except that,
rather than building an egg from a source directory containing a
setup.py script.
The develop function takes 2 positional arguments:
setup
The path to a setup script, typically named "setup.py", or a
directory containing a setup.py script.
dest
The directory to install the egg link to
It supports some optional keyword argument:
build_ext
A dictionary of options to be passed to the distutils build_ext
command when building extensions.
We have a local directory containing the extdemo source:
>>> ls(extdemo)
- MANIFEST
- MANIFEST.in
- README
- extdemo.c
- setup.py
Now, we can use the develop function to create a develop egg from the source
distribution:
>>> zc.buildout.easy_install.develop(
... extdemo, dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')})
'/sample-install/extdemo.egg-link'
1. A sequence of distribution requirements. These are of the same
form as setuptools requirements. Here we passed a single
requirement, for the version 0.1 demo distribution.
2. A working set,
3. The destination directory.
The bin directory now contains a generated script:
>>> ls(bin)
- demo
The return value is a list of the scripts generated:
>>> import os, sys
>>> if sys.platform == 'win32':
... scripts == [os.path.join(bin, 'demo.exe'),
... os.path.join(bin, 'demo-script.py')]
... else:
... scripts == [os.path.join(bin, 'demo')]
True
Note that in Windows, 2 files are generated for each script. A script
file, ending in '-script.py', and an exe file that allows the script
to be invoked directly without having to specify the Python
interpreter and without having to provide a '.py' suffix.
The demo script run the entry point defined in the demo egg:
>>> cat(bin, 'demo') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Some things to note:
- The demo and demoneeded eggs are added to the beginning of sys.path.
- The module for the script entry point is imported and the entry
point, in this case, 'main', is run.
Rather than requirement strings, you can pass tuples containing 3
strings:
- A script name,
- A module,
- An attribute expression for an entry point within the module.
For example, we could have passed entry point information directly
rather than passing a requirement:
>>> scripts = zc.buildout.easy_install.scripts(
... [('demo', 'eggrecipedemo', 'main')], ws,
... sys.executable, bin)
>>> cat(bin, 'demo') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Passing entry-point information directly is handy when using eggs (or
distributions) that don't declare their entry points, such as
distributions that aren't based on setuptools.
The interpreter keyword argument can be used to generate a script that can
be used to invoke the Python interactive interpreter with the path set
based on the working set. This generated script can also be used to
run other scripts with the path set on the working set:
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, interpreter='py')
>>> ls(bin)
- demo
- py
>>> if sys.platform == 'win32':
... scripts == [os.path.join(bin, 'demo.exe'),
... os.path.join(bin, 'demo-script.py'),
... os.path.join(bin, 'py.exe'),
... os.path.join(bin, 'py-script.py')]
... else:
... scripts == [os.path.join(bin, 'demo'),
... os.path.join(bin, 'py')]
True
The py script simply runs the Python interactive interpreter with
the path set:
>>> cat(bin, 'py') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
<BLANKLINE>
sys.path[0:0] = [
'/sample-install/demo-0.3-pyN.N.egg',
'/sample-install/demoneeded-1.1-pyN.N.egg',
]
<BLANKLINE>
_interactive = True
if len(sys.argv) > 1:
_options, _args = __import__("getopt").getopt(sys.argv[1:], 'ic:m:')
_interactive = False
for (_opt, _val) in _options:
if _opt == '-i':
_interactive = True
elif _opt == '-c':
exec(_val)
elif _opt == '-m':
sys.argv[1:] = _args
_args = []
__import__("runpy").run_module(
_val, {}, "__main__", alter_sys=True)
<BLANKLINE>
if _args:
sys.argv[:] = _args
__file__ = _args[0]
del _options, _args
__file__f = open(__file__)
exec(compile(__file__f.read(), __file__, "exec"))
__file__f.close(); del __file__f
<BLANKLINE>
if _interactive:
del _interactive
__import__("code").interact(banner="", local=globals())
If invoked with a script name and arguments, it will run that script, instead.
>>> write('ascript', r'''
... "demo doc"
... import sys
... print_ = lambda *a: sys.stdout.write(' '.join(map(str, a))+'\n')
... print_(sys.argv)
... print_((__name__, __file__, __doc__))
... ''')
>>> print_(system(join(bin, 'py')+' ascript a b c'), end='')
['ascript', 'a', 'b', 'c']
('__main__', 'ascript', 'demo doc')
For Python 2.5 and higher, you can also use the -m option to run a
module:
>>> if sys.version_info < (2, 5):
... print ('usage: pdb.py blah blah blah')
... else:
... print_(system(join(bin, 'py')+' -m pdb'), end='')
... # doctest: +ELLIPSIS
usage: pdb.py ...
>>> print_(system(join(bin, 'py')+' -m pdb what'), end='')
Error: what does not exist
An additional argument can be passed to define which scripts to install
and to provide script names. The argument is a dictionary mapping
original script names to new script names.
>>> bin = tmpdir('bin2')
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'))
>>> if sys.platform == 'win32':
... scripts == [os.path.join(bin, 'run.exe'),
... os.path.join(bin, 'run-script.py')]
... else:
... scripts == [os.path.join(bin, 'run')]
True
>>> ls(bin)
- run
>>> print_(system(os.path.join(bin, 'run')), end='')
3 1
Including extra paths in scripts
--------------------------------
We can pass a keyword argument, extra paths, to cause additional paths
to be included in the a generated script:
>>> foo = tmpdir('foo')
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'),
... extra_paths=[foo])
>>> cat(bin, 'run') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
'/foo',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Providing script arguments
--------------------------
An "argument" keyword argument can be used to pass arguments to an
entry point. The value passed is a source string to be placed between the
parentheses in the call:
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'),
... arguments='1, 2')
>>> cat(bin, 'run') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main(1, 2))
Passing initialization code
---------------------------
You can also pass script initialization code:
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, bin, dict(demo='run'),
... arguments='1, 2',
... initialization='import os\nos.chdir("foo")')
>>> cat(bin, 'run') # doctest: +NORMALIZE_WHITESPACE
#!/usr/local/bin/python2.7
import sys
sys.path[0:0] = [
'/sample-install/demo-0.3-py2.4.egg',
'/sample-install/demoneeded-1.1-py2.4.egg',
]
<BLANKLINE>
import os
os.chdir("foo")
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main(1, 2))
Relative paths
--------------
Sometimes, you want to be able to move a buildout directory around and
have scripts still work without having to rebuild them. We can
control this using the relative_paths option to install. You need
to pass a common base directory of the scripts and eggs:
>>> bo = tmpdir('bo')
>>> ba = tmpdir('ba')
>>> mkdir(bo, 'eggs')
>>> mkdir(bo, 'bin')
>>> mkdir(bo, 'other')
>>> ws = zc.buildout.easy_install.install(
... ['demo'], join(bo, 'eggs'), links=[link_server],
... index=link_server+'index/')
>>> scripts = zc.buildout.easy_install.scripts(
... ['demo'], ws, sys.executable, join(bo, 'bin'), dict(demo='run'),
... extra_paths=[ba, join(bo, 'bar')],
... interpreter='py',
... relative_paths=bo)
>>> cat(bo, 'bin', 'run')
#!/usr/local/bin/python2.7
<BLANKLINE>
import os
<BLANKLINE>
join = os.path.join
base = os.path.dirname(os.path.abspath(os.path.realpath(__file__)))
base = os.path.dirname(base)
<BLANKLINE>
import sys
sys.path[0:0] = [
join(base, 'eggs/demo-0.3-pyN.N.egg'),
join(base, 'eggs/demoneeded-1.1-pyN.N.egg'),
'/ba',
join(base, 'bar'),
]
<BLANKLINE>
import eggrecipedemo
<BLANKLINE>
if __name__ == '__main__':
sys.exit(eggrecipedemo.main())
Note that the extra path we specified that was outside the directory
passed as relative_paths wasn't converted to a relative path.
Of course, running the script works:
>>> print_(system(join(bo, 'bin', 'run')), end='')
3 1
We specified an interpreter and its paths are adjusted too:
>>> cat(bo, 'bin', 'py')
#!/usr/local/bin/python2.7
<BLANKLINE>
import os
<BLANKLINE>
join = os.path.join
base = os.path.dirname(os.path.abspath(os.path.realpath(__file__)))
base = os.path.dirname(base)
<BLANKLINE>
import sys
<BLANKLINE>
sys.path[0:0] = [
join(base, 'eggs/demo-0.3-pyN.N.egg'),
join(base, 'eggs/demoneeded-1.1-pyN.N.egg'),
'/ba',
join(base, 'bar'),
]
<BLANKLINE>
_interactive = True
if len(sys.argv) > 1:
_options, _args = __import__("getopt").getopt(sys.argv[1:], 'ic:m:')
_interactive = False
for (_opt, _val) in _options:
if _opt == '-i':
_interactive = True
elif _opt == '-c':
exec(_val)
elif _opt == '-m':
sys.argv[1:] = _args
_args = []
__import__("runpy").run_module(
_val, {}, "__main__", alter_sys=True)
<BLANKLINE>
if _args:
sys.argv[:] = _args
__file__ = _args[0]
del _options, _args
__file__f = open(__file__)
exec(compile(__file__f.read(), __file__, "exec"))
__file__f.close(); del __file__f
<BLANKLINE>
if _interactive:
del _interactive
__import__("code").interact(banner="", local=globals())
Installing distutils-style scripts
----------------------------------
Most python libraries use the console_scripts entry point nowadays. But
several still have a ``scripts=['bin/something']`` in their setup() call.
Buildout also installs those:
>>> distdir = tmpdir('distutilsscriptdir')
>>> distbin = tmpdir('distutilsscriptbin')
>>> ws = zc.buildout.easy_install.install(
... ['other'], distdir,
... links=[link_server], index=link_server+'index/')
>>> scripts = zc.buildout.easy_install.scripts(
... ['other'], ws, sys.executable, distbin)
>>> ls(distbin)
- distutilsscript
It also works for zipped eggs:
>>> distdir2 = tmpdir('distutilsscriptdir2')
>>> distbin2 = tmpdir('distutilsscriptbin2')
>>> ws = zc.buildout.easy_install.install(
... ['du_zipped'], distdir2,
... links=[link_server], index=link_server+'index/')
>>> scripts = zc.buildout.easy_install.scripts(
... ['du_zipped'], ws, sys.executable, distbin2)
>>> ls(distbin2)
- distutilsscript
Distutils copies the script files verbatim, apart from a line at the top that
looks like ``#!/usr/bin/python``, which gets replaced by the actual python
interpreter. Buildout does the same, but additionally also adds the sys.path
like for the console_scripts:
>>> cat(distbin, 'distutilsscript')
#!/usr/local/bin/python2.7
<BLANKLINE>
import sys
sys.path[0:0] = [
'/distutilsscriptdir/other-1.0-pyN.N.egg',
]
<BLANKLINE>
<BLANKLINE>
import sys; sys.stdout.write("distutils!\n")
Due to the nature of distutils scripts, buildout cannot pass arguments as
there's no specific method to pass them to.
Handling custom build options for extensions provided in source distributions
-----------------------------------------------------------------------------
Sometimes, we need to control how extension modules are built. The
build function provides this level of control. It takes a single
package specification, downloads a source distribution, and builds it
with specified custom build options.
The build function takes 3 positional arguments:
spec
A package specification for a source distribution
dest
A destination directory
build_ext
A dictionary of options to be passed to the distutils build_ext
command when building extensions.
The name of the egg link created is returned.
It supports a number of optional keyword arguments:
links
a sequence of URLs, file names, or directories to look for
links to distributions,
index
The URL of an index server, or almost any other valid URL. :)
If not specified, the Python Package Index,
http://pypi.python.org/simple/, is used. You can specify an
alternate index with this option. If you use the links option and
if the links point to the needed distributions, then the index can
be anything and will be largely ignored. In the examples, here,
we'll just point to an empty directory on our link server. This
will make our examples run a little bit faster.
path
A list of additional directories to search for locally-installed
distributions.
newest
A boolean value indicating whether to search for new distributions
when already-installed distributions meet the requirement. When
this is true, the default, and when the destination directory is
not None, then the install function will search for the newest
distributions that satisfy the requirements.
versions
A dictionary mapping project names to version numbers to be used
when selecting distributions. This can be used to specify a set of
distribution versions independent of other requirements.
Our link server included a source distribution that includes a simple
extension, extdemo.c::
#include <Python.h>
#include <extdemo.h>
static PyMethodDef methods[] = {};
PyMODINIT_FUNC
initextdemo(void)
{
PyObject *m;
m = Py_InitModule3("extdemo", methods, "");
#ifdef TWO
PyModule_AddObject(m, "val", PyInt_FromLong(2));
#else
PyModule_AddObject(m, "val", PyInt_FromLong(EXTDEMO));
#endif
}
The extension depends on a system-dependent include file, extdemo.h,
that defines a constant, EXTDEMO, that is exposed by the extension.
We'll add an include directory to our sample buildout and add the
needed include file to it:
>>> mkdir('include')
>>> write('include', 'extdemo.h',
... """
... #define EXTDEMO 42
... """)
Now, we can use the build function to create an egg from the source
distribution:
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
['/sample-install/extdemo-1.4-py2.4-unix-i686.egg']
The function returns the list of eggs
Now if we look in our destination directory, we see we have an extdemo egg:
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.4-py2.4-unix-i686.egg
Let's update our link server with a new version of extdemo:
>>> update_extdemo()
>>> print_(get(link_server), end='')
<html><body>
<a href="bigdemo-0.1-py2.4.egg">bigdemo-0.1-py2.4.egg</a><br>
<a href="demo-0.1-py2.4.egg">demo-0.1-py2.4.egg</a><br>
<a href="demo-0.2-py2.4.egg">demo-0.2-py2.4.egg</a><br>
<a href="demo-0.3-py2.4.egg">demo-0.3-py2.4.egg</a><br>
<a href="demo-0.4c1-py2.4.egg">demo-0.4c1-py2.4.egg</a><br>
<a href="demoneeded-1.0.zip">demoneeded-1.0.zip</a><br>
<a href="demoneeded-1.1.zip">demoneeded-1.1.zip</a><br>
<a href="demoneeded-1.2c1.zip">demoneeded-1.2c1.zip</a><br>
<a href="du_zipped-1.0-pyN.N.egg">du_zipped-1.0-pyN.N.egg</a><br>
<a href="extdemo-1.4.zip">extdemo-1.4.zip</a><br>
<a href="extdemo-1.5.zip">extdemo-1.5.zip</a><br>
<a href="index/">index/</a><br>
<a href="other-1.0-py2.4.egg">other-1.0-py2.4.egg</a><br>
</body></html>
The easy_install caches information about servers to reduce network
access. To see the update, we have to call the clear_index_cache
function to clear the index cache:
>>> zc.buildout.easy_install.clear_index_cache()
If we run build with newest set to False, we won't get an update:
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/',
... newest=False)
['/sample-install/extdemo-1.4-py2.4-linux-i686.egg']
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.4-py2.4-unix-i686.egg
But if we run it with the default True setting for newest, then we'll
get an updated egg:
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
['/sample-install/extdemo-1.5-py2.4-unix-i686.egg']
>>> ls(dest)
d demo-0.2-py2.4.egg
d demo-0.3-py2.4.egg
d demoneeded-1.0-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.4-py2.4-unix-i686.egg
d extdemo-1.5-py2.4-unix-i686.egg
The versions option also influences the versions used. For example,
if we specify a version for extdemo, then that will be used, even
though it isn't the newest. Let's clean out the destination directory
first:
>>> import os
>>> for name in os.listdir(dest):
... remove(dest, name)
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/',
... versions=dict(extdemo='1.4'))
['/sample-install/extdemo-1.4-py2.4-unix-i686.egg']
>>> ls(dest)
d extdemo-1.4-py2.4-unix-i686.egg
Handling custom build options for extensions in develop eggs
------------------------------------------------------------
The develop function is similar to the build function, except that,
rather than building an egg from a source directory containing a
setup.py script.
The develop function takes 2 positional arguments:
setup
The path to a setup script, typically named "setup.py", or a
directory containing a setup.py script.
dest
The directory to install the egg link to
It supports some optional keyword argument:
build_ext
A dictionary of options to be passed to the distutils build_ext
command when building extensions.
We have a local directory containing the extdemo source:
>>> ls(extdemo)
- MANIFEST
- MANIFEST.in
- README
- extdemo.c
- setup.py
Now, we can use the develop function to create a develop egg from the source
distribution:
>>> zc.buildout.easy_install.develop(
... extdemo, dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')})
'/sample-install/extdemo.egg-link'
The name of the egg link created is returned.
Now if we look in our destination directory, we see we have an extdemo
egg link:
>>> ls(dest)
d extdemo-1.4-py2.4-unix-i686.egg
- extdemo.egg-link
And that the source directory contains the compiled extension:
>>> contents = os.listdir(extdemo)
>>> bool([f for f in contents if f.endswith('.so') or f.endswith('.pyd')])
True
Download cache
--------------
Now if we look in our destination directory, we see we have an extdemo
egg link:
>>> ls(dest)
d extdemo-1.4-py2.4-unix-i686.egg
- extdemo.egg-link
And that the source directory contains the compiled extension:
>>> contents = os.listdir(extdemo)
>>> bool([f for f in contents if f.endswith('.so') or f.endswith('.pyd')])
True
Download cache
--------------
Normally, when distributions are installed, if any processing is
needed, they are downloaded from the internet to a temporary directory
and then installed from there. A download cache can be used to avoid
the download step. This can be useful to reduce network access and to
create source distributions of an entire buildout.
Normally, when distributions are installed, if any processing is
needed, they are downloaded from the internet to a temporary directory
and then installed from there. A download cache can be used to avoid
the download step. This can be useful to reduce network access and to
create source distributions of an entire buildout.
A download cache is specified by calling the download_cache
function. The function always returns the previous setting. If no
argument is passed, then the setting is unchanged. If an argument is
passed, the download cache is set to the given path, which must point
to an existing directory. Passing None clears the cache setting.
A download cache is specified by calling the download_cache
function. The function always returns the previous setting. If no
argument is passed, then the setting is unchanged. If an argument is
passed, the download cache is set to the given path, which must point
to an existing directory. Passing None clears the cache setting.
To see this work, we'll create a directory and set it as the cache
directory:
To see this work, we'll create a directory and set it as the cache
directory:
>>> cache = tmpdir('cache')
>>> zc.buildout.easy_install.download_cache(cache)
We'll recreate our destination directory:
>>> cache = tmpdir('cache')
>>> zc.buildout.easy_install.download_cache(cache)
We'll recreate our destination directory:
>>> remove(dest)
>>> dest = tmpdir('sample-install')
>>> remove(dest)
>>> dest = tmpdir('sample-install')
We'd like to see what is being fetched from the server, so we'll
enable server logging:
We'd like to see what is being fetched from the server, so we'll
enable server logging:
>>> _ = get(link_server+'enable_server_logging')
GET 200 /enable_server_logging
>>> _ = get(link_server+'enable_server_logging')
GET 200 /enable_server_logging
Now, if we install demo, and extdemo:
Now, if we install demo, and extdemo:
>>> ws = zc.buildout.easy_install.install(
... ['demo==0.2'], dest,
... links=[link_server], index=link_server+'index/')
GET 200 /
GET 404 /index/demo/
GET 200 /index/
GET 200 /demo-0.2-py2.4.egg
GET 404 /index/demoneeded/
GET 200 /demoneeded-1.1.zip
>>> ws = zc.buildout.easy_install.install(
... ['demo==0.2'], dest,
... links=[link_server], index=link_server+'index/')
GET 200 /
GET 404 /index/demo/
GET 200 /index/
GET 200 /demo-0.2-py2.4.egg
GET 404 /index/demoneeded/
GET 200 /demoneeded-1.1.zip
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
GET 404 /index/extdemo/
GET 200 /extdemo-1.5.zip
['/sample-install/extdemo-1.5-py2.4-linux-i686.egg']
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
GET 404 /index/extdemo/
GET 200 /extdemo-1.5.zip
['/sample-install/extdemo-1.5-py2.4-linux-i686.egg']
Not only will we get eggs in our destination directory:
Not only will we get eggs in our destination directory:
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.5-py2.4-linux-i686.egg
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.5-py2.4-linux-i686.egg
But we'll get distributions in the cache directory:
But we'll get distributions in the cache directory:
>>> ls(cache)
- demo-0.2-py2.4.egg
- demoneeded-1.1.zip
- extdemo-1.5.zip
>>> ls(cache)
- demo-0.2-py2.4.egg
- demoneeded-1.1.zip
- extdemo-1.5.zip
The cache directory contains uninstalled distributions, such as zipped
eggs or source distributions.
The cache directory contains uninstalled distributions, such as zipped
eggs or source distributions.
Let's recreate our destination directory and clear the index cache:
Let's recreate our destination directory and clear the index cache:
>>> remove(dest)
>>> dest = tmpdir('sample-install')
>>> zc.buildout.easy_install.clear_index_cache()
>>> remove(dest)
>>> dest = tmpdir('sample-install')
>>> zc.buildout.easy_install.clear_index_cache()
Now when we install the distributions:
Now when we install the distributions:
>>> ws = zc.buildout.easy_install.install(
... ['demo==0.2'], dest,
... links=[link_server], index=link_server+'index/')
GET 200 /
GET 404 /index/demo/
GET 200 /index/
GET 404 /index/demoneeded/
>>> ws = zc.buildout.easy_install.install(
... ['demo==0.2'], dest,
... links=[link_server], index=link_server+'index/')
GET 200 /
GET 404 /index/demo/
GET 200 /index/
GET 404 /index/demoneeded/
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
GET 404 /index/extdemo/
['/sample-install/extdemo-1.5-py2.4-linux-i686.egg']
>>> zc.buildout.easy_install.build(
... 'extdemo', dest,
... {'include-dirs': os.path.join(sample_buildout, 'include')},
... links=[link_server], index=link_server+'index/')
GET 404 /index/extdemo/
['/sample-install/extdemo-1.5-py2.4-linux-i686.egg']
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.5-py2.4-linux-i686.egg
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
d extdemo-1.5-py2.4-linux-i686.egg
Note that we didn't download the distributions from the link server.
Note that we didn't download the distributions from the link server.
If we remove the restriction on demo, we'll download a newer version
from the link server:
If we remove the restriction on demo, we'll download a newer version
from the link server:
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest,
... links=[link_server], index=link_server+'index/')
GET 200 /demo-0.3-py2.4.egg
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest,
... links=[link_server], index=link_server+'index/')
GET 200 /demo-0.3-py2.4.egg
Normally, the download cache is the preferred source of downloads, but
not the only one.
Normally, the download cache is the preferred source of downloads, but
not the only one.
Installing solely from a download cache
---------------------------------------
Installing solely from a download cache
---------------------------------------
A download cache can be used as the basis of application source
releases. In an application source release, we want to distribute an
application that can be built without making any network accesses. In
this case, we distribute a download cache and tell the easy_install
module to install from the download cache only, without making network
accesses. The install_from_cache function can be used to signal that
packages should be installed only from the download cache. The
function always returns the previous setting. Calling it with no
arguments returns the current setting without changing it:
A download cache can be used as the basis of application source
releases. In an application source release, we want to distribute an
application that can be built without making any network accesses. In
this case, we distribute a download cache and tell the easy_install
module to install from the download cache only, without making network
accesses. The install_from_cache function can be used to signal that
packages should be installed only from the download cache. The
function always returns the previous setting. Calling it with no
arguments returns the current setting without changing it:
>>> zc.buildout.easy_install.install_from_cache()
False
>>> zc.buildout.easy_install.install_from_cache()
False
Calling it with a boolean value changes the setting and returns the
previous setting:
Calling it with a boolean value changes the setting and returns the
previous setting:
>>> zc.buildout.easy_install.install_from_cache(True)
False
>>> zc.buildout.easy_install.install_from_cache(True)
False
Let's remove demo-0.3-py2.4.egg from the cache, clear the index cache,
recreate the destination directory, and reinstall demo:
>>> for f in os.listdir(cache):
... if f.startswith('demo-0.3-'):
... remove(cache, f)
Let's remove demo-0.3-py2.4.egg from the cache, clear the index cache,
recreate the destination directory, and reinstall demo:
>>> for f in os.listdir(cache):
... if f.startswith('demo-0.3-'):
... remove(cache, f)
>>> zc.buildout.easy_install.clear_index_cache()
>>> remove(dest)
>>> dest = tmpdir('sample-install')
>>> zc.buildout.easy_install.clear_index_cache()
>>> remove(dest)
>>> dest = tmpdir('sample-install')
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest,
... links=[link_server], index=link_server+'index/')
>>> ws = zc.buildout.easy_install.install(
... ['demo'], dest,
... links=[link_server], index=link_server+'index/')
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
>>> ls(dest)
d demo-0.2-py2.4.egg
d demoneeded-1.1-py2.4.egg
This time, we didn't download from or even query the link server.
This time, we didn't download from or even query the link server.
.. Disable the download cache:
.. Disable the download cache:
>>> zc.buildout.easy_install.download_cache(None)
'/cache'
>>> zc.buildout.easy_install.download_cache(None)
'/cache'
>>> zc.buildout.easy_install.install_from_cache(False)
True
>>> zc.buildout.easy_install.install_from_cache(False)
True
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