[Distutils] Can you collapse easy-install.pth somehow?
pje at telecommunity.com
Wed Mar 4 17:29:51 CET 2009
At 12:11 AM 3/4/2009 -0600, skip at pobox.com wrote:
>So I have rather casually installed a bunch of packages from PyPI using
>easy_install. It now contains 23 eggs, all of which get used a bit, but
>nowhere near as often as the standard lib or our internal stuff.
>Unsuccessfully stat()ing in all those egg directories was really starting to
>hammer our NFS server (we often start up hundreds of Python processes at a
>time), so I commented out the second import line at the end which serves to
>leave the eggs at the end of sys.path. Now every time I install a package I
>have to quickly edit easy-install.path to remove the import line the install
>I wonder though... Is there some alternate way to install stuff from PyPI
>which reduces the number of directories on sys.path? Maybe some
>post-processing step which takes the current set of eggs, creates a single
>directory into which they are all unfolded? That single directory could
>then be added to sys.path.
You could use Ian Bicking's 'pip' installer. It can't install from
eggs, but it does do source installs this way.
There is a very straightforward mapping from zipped eggs to "flat"
files, btw. For a given .egg file or directory, the mapping is
simply to unzip it, renaming its EGG-INFO subdirectory to the
original egg's filename with '-info' appended. E.g.
"foobar-1.2-py2.5.egg-info/". Everything else remains exactly the same.
It wouldn't be hard to make a tool that does this; in fact, the
setuptools.archive_util module has an 'extract_archive' function that
works on directories as well as zipfiles, and can be passed a filter
function that can change the extraction location for any given
file. Something like:
def flatten_egg(egg_filename, extract_dir):
eggbase = os.path.filename(egg_filename)+'-info'
def file_filter(src, dst):
src = eggbase+s[8:]
dst = os.path.join(extract_dir, *src.split('/'))
return extract_archive(egg_filename, extract_dir, file_filter)
Of course, this will only work if 'egg_filename' is a valid .egg file
or directory; the results are otherwise pretty unpredictable. This
also doesn't check for overwriting other files, deal with
permissions, etc. Ergo, making this production-ready is left as an
exercise for the implementer. ;-)
More information about the Distutils-SIG