Hi,
On 04/04/2011 08:19 AM, [email protected] wrote:
Wicd runs as root. The demon is written in Python. When python runs it
likes to write new .pyc and/or .pyo files into the store. Since wicd is
running as root it obliges and modifies the store directory. Clearly
this is bad.
This has been fixed in the modular-python branch with this patch:
https://svn.nixos.org/repos/nix/nixpkgs/branches/modular-python/pkgs/development/interpreters/python/2.7/nix-store-mtime.patch
The problem was that *.pyc files contain the timestamp of the
corresponding .py file. If the stored timestamp doesn't match the
actual timestamp of the .py file, then the .pyc file is considered out
of date and will be regenerated. However in Nix we change the timestamp
to 1 after the pyc files have been generated. So the entire pyc
mechanism was broken in Nixpkgs. The patch fixes this by special-casing
timestamps of 1.
On a more general note, it would be nice if we could prevent accidental
changes to store paths by root. On ext2/3/4 this can be done by setting
the immutable bit on a file. Unfortunately, it also prevents additional
hard links to the file, so it breaks `nix-store --optimise'.
--
Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/
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