Gallery

All multisites share the same modules/ and themes/ folder in the codebase.
Each multisite can add/remove plugins via "site admin -> plugins" and this
just removes the whole plugin for other multisites without proper
uninstallation.

Requirements:
- Multisite G2
- The modules/ & themes/ folders must be writeable (e.g. usually the case
with php-cgi, when installed with the preinstaller or when the
administrator makes them writeable).

Workaround:
Lock down the codebase, don't make it writeable for multisites (filesystem
permissions).

Suggested solution:
- The codebase should be read-only and interpreted as "managed plugins".
Managed by the provider/administrator.
- Either disable DP for multisites or use a dedicated modules/ and themes/
folder for each multisite such that they don't interfere.
- Also consider the case where multisite A) is running a different version
of a plugin than multisite B). So maybe say that the code of managed
plugins can only be updated by the manager.

Reported in the forums:
http://gallery.menalto.com/node/58633

Verified by andy_st