[dx2] Browse should have a cache cleaning policy

[m_anish]

Browse cache can bloat up with time consuming valuable space on the laptop.

On one laptop me and tch checked, there were 400MB of unaccessible files (mostly multimedia) in the Browse instance folder.

Thus, Browse should have some kind of cache cleaning policy. For example, we could clean the cache after every one week or so.

[RafaelOrtiz]

Also we can look in ways of setting preferences (or combination of preferences) as per

​http://kb.mozillazine.org/About:config_entries

[m_anish]

This seems to be a bigger issue than we initially anticipated. Many kids in Caacupe have bloated up browser caches and the space on an XO-1 runs out real quick.

I'd also be interested in knowing whether this exists on other releases 0.84/OLPC, 0.88/OLPC 0.92.1/OLPC 0.92.1/DX3 as well.

Adding erikos in cc, since this is might be a big real world problem.

[RafaelOrtiz]

Testing big downloads with icarito, seems to have brought this problem into surface,specially when a download is cancelled or interrupted for example due to a network disconnection. Browse should erase cache when either this situations occur.

[RafaelOrtiz]

Well, it's not exactly cache that bloats out the filesystem, are partial downloads.
there is a commit on mainline to address this.

[RafaelOrtiz]

Fix packaged in browse 121.

[icarito]

Partial fix in ​http://git.sugarlabs.org/browse/mainline/commit/cc38d3bdc7f7f3ab4ed166166e0a8a71c2cbeaf0

However, this does not cover the case when Browse or Sugar crash. We need a procedure to clean instance/ when starting browse (needs to check it is the only instance to avoid corner case of more than one browse instance). Another option is to check the date of partial files...

Leaving open, adding me as cc.

[godiard]

Browse already have a mechanism to delete old files

​https://github.com/sugarlabs/browse-activity/blob/master/webactivity.py#L245

If any file is missed, we need open a bug with information about how reproduce the problem