At 09:29 AM 10/26/2010 +0300, anatoly techtonik wrote:
Hello,
How come that packages are unable to write into TEMP directory during
installation?
Because projects that write anything outside of distutils-defined
directories are breaking the implicit contract of a distutils-based
installation, and that means that easy_install cannot guarantee that
the installation will proceed correctly. That is why the message
says the package "cannot be safely installed by EasyInstall".
(I suppose it could say instead that EasyInstall cannot be sure
whether installation is safe, and is thus refusing the temptation to
guess, but that would make the message a bit longer.)
In this specific case ("Gerald"), the package has two problems that
are causing this error: first, it is trying to import the package
before it is installed, and second, it writes files as a side-effect
of this importing. (The author seems to have tried to work around
the usual consequences of the first problem, but that can't mitigate
the second problem.)
While neither of these things is technically illegal, they are in the
first case bad practice for installation, and in the second case, bad
programming practice for a library. ("Gerald" appears to be an
application rather than a library, of course, but even so, an
application shouldn't be started up before it's been installed --
especially not if it's writing files outside the build/install directory.)
All this being said -- a future version of easy_install could (and
perhaps should) reset TEMP/TMP in the installation sandbox to
something that's actually usable.
>python -m easy_install gerald
...
Downloading
http://pypi.python.org/packages/source/g/gerald/gerald-0.4.1.zip#md5=1b29e97c0077282a26829693fb07dca1
Processing gerald-0.4.1.zip
Running gerald-0.4.1\setup.py -q bdist_egg --dist-dir
c:\users\user\appdata\local\temp\easy_install-1jedvu\gerald-0.4.1\egg-dist-tmp-wg8yyn
error: SandboxViolation:
open('C:\\Users\\user\\AppData\\Local\\Temp\\gerald.log', 'a') {}
The package setup script has attempted to modify files on your system
that are not within the EasyInstall build area, and has been aborted.
This package cannot be safely installed by EasyInstall, and may not
support alternate installation locations even if you run its setup
script by hand. Please inform the package's author and the EasyInstall
maintainers to find out if a fix or workaround is available.
--
anatoly t.
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