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slapos.buildout
Commit f16efa06 authored by Jim Fulton's avatar Jim Fulton
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Added support for a download cache.

parent 06ecdb42
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CHANGES.txt
View file @ f16efa06
......@@ -14,6 +14,15 @@ Change History
1.0.0b23 (2007-03-??)
=====================
Feature Changes
---------------
- Added support for download caches. A buildout can specify a cache
for distribution downloads. The cache can be shared among buildouts
to reduce network access and to support creating source
distributions for applications allowing install without network
access.
Bugs Fixed
----------
......
src/zc/buildout/buildout.py
View file @ f16efa06
......@@ -149,6 +149,29 @@ class Buildout(UserDict.DictMixin):
if versions:
zc.buildout.easy_install.default_versions(dict(self[versions]))
download_cache = options.get('download-cache')
if download_cache:
download_cache = os.path.join(options['directory'], download_cache)
if not os.path.isdir(download_cache):
raise zc.buildout.UserError(
'The specified download cache:\n'
'%r\n'
"Doesn't exist.\n"
% download_cache)
download_cache = os.path.join(download_cache, 'dist')
if not os.path.isdir(download_cache):
os.mkdir(download_cache)
zc.buildout.easy_install.download_cache(download_cache)
install_from_cache = options.get('install-from-cache')
if install_from_cache:
if install_from_cache not in ('true', 'false'):
self._error('Invalid value for install-from-cache option: %s',
install_from_cache)
if install_from_cache == 'true':
zc.buildout.easy_install.install_from_cache(True)
# "Use" each of the defaults so they aren't reported as unused options.
for name in _buildout_default_options:
options[name]
......
src/zc/buildout/downloadcache.txt 0 → 100644
View file @ f16efa06
Using a 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.
The buildout download-cache option can be used to specify a directory
to be used as a download cache.
In this example, we'll create a directory to hold the cache:
>>> cache = tmpdir('cache')
And set up a buildout that downloads some eggs:
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = eggs
... download-cache = %(cache)s
... find-links = %(link_server)s
...
... [eggs]
... recipe = zc.recipe.egg
... eggs = demo ==0.2
... ''' % globals())
We specified a link server that has some distributions available for
download:
>>> print get(link_server),
<html><body>
<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="demoneeded-1.0.zip">demoneeded-1.0.zip</a><br>
<a href="demoneeded-1.1.zip">demoneeded-1.1.zip</a><br>
<a href="extdemo-1.4.zip">extdemo-1.4.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>
We'll enable logging on the link server so we can see what's going on:
>>> get(link_server+'enable_server_logging')
GET 200 /enable_server_logging
''
We also specified a download cache.
If we run the buildout, we'll see the eggs installed from the link
server as usual:
>>> print system(buildout),
GET 200 /
GET 200 /demo-0.2-py2.4.egg
GET 200 /demoneeded-1.1.zip
buildout: Installing eggs
zc.buildout.easy_install: Getting new distribution for demo==0.2
zc.buildout.easy_install: Got demo 0.2
zc.buildout.easy_install: Getting new distribution for demoneeded
zc.buildout.easy_install: Got demoneeded 1.1
We'll also get the download cache populated. The buildout doesn't put
files in the cache directly. It creates an intermediate directory,
dist:
>>> ls(cache)
d dist
>>> ls(cache, 'dist')
- demo-0.2-py2.4.egg
- demoneeded-1.1.zip
If we remove the installed eggs from eggs directory and re-run the buildout:
>>> import os
>>> for f in os.listdir('eggs'):
... if f.startswith('demo'):
... remove('eggs', f)
>>> print system(buildout),
GET 200 /
buildout: Updating eggs
zc.buildout.easy_install: Getting new distribution for demo==0.2
zc.buildout.easy_install: Got demo 0.2
zc.buildout.easy_install: Getting new distribution for demoneeded
zc.buildout.easy_install: Got demoneeded 1.1
We see that the distributions aren't downloaded, because they're
downloaded from the 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 buildout with download cache and tell the
buildout to install from the download cache only, without making
network accesses. The buildout install-from-cache option can be used
to signal that packages should be installed only from the download
cache.
Let's remove our installed eggs and run the buildout with the
install-from-cache option set to true:
>>> for f in os.listdir('eggs'):
... if f.startswith('demo'):
... remove('eggs', f)
>>> write('buildout.cfg',
... '''
... [buildout]
... parts = eggs
... download-cache = %(cache)s
... install-from-cache = true
... find-links = %(link_server)s
...
... [eggs]
... recipe = zc.recipe.egg
... eggs = demo
... ''' % globals())
>>> print system(buildout),
buildout: Uninstalling eggs
buildout: Installing eggs
zc.buildout.easy_install: Getting new distribution for demo
zc.buildout.easy_install: Got demo 0.2
zc.buildout.easy_install: Getting new distribution for demoneeded
zc.buildout.easy_install: Got demoneeded 1.1
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