Michael Jurisch wrote:
Hi!
You probably need to explain why you want to do this. For example - why
would you need to change the file permissions? If squid created the
file in the cache, it can read it back - why would you want to change
the permissions?
Ok, I try to keep it short:
We want to deliever specific content via the proxy, so that the original server
hasn't to handle all the load. But we also want that a web editor can decide,
that a certain file will be deleted from the cache within seconds manually and
also lock (change file permission) the files, which means the file should
remain in cache, but surfers can't access them (= stoping delivering the
content). That later one was just a thought of mine, I want to test whether it
works or not.
In the end we want to have a web front end for customers who can easily do that
things describe above.
Riiight.... well the first bit is possible.
Seeing as your system knows which file is now obsolete you can use any
of the the cache-manager systems to drop individual URI out of the
cache. Next request squid will fetch from the authoritative server again
as per normal.
Altering the cache directly is NOT recommended. Squid is not guaranteed
to use the same filing system in two given cache-dirs and not all squid
fs match OS fs. If a file is altered in-cache it may cause serious problems.
'Locking' of files like that makes no sense in HTTP. Either a URI is
available or its dead. If you are really wanting an archive of old
content you should be looking elsewhere than the web proxy.
You're better off locking it on the origin server fs and following the
same procedure on the proxy as for changed files.
Amos
