[cap-talk] plash (or bash) and undo/redo

[John Carlson]

Since plash replaces glibc with it's own version of glibc to run  
programs, wouldn't it be possible to add undo, redo, commit, and  
rollback commands to plash?  I know it would be hard (but not  
impossible) to undo/redo networking commands, but it seems like you  
could undo/redo a lot of file system stuff.  For writes, you would do  
a read first, and store the underlying data being written in an undo  
object.  For reads, you could reset the file pointer backwards.  You'd  
have to figure out the opposite of the fcntl and ioctl stuff.  And  
opens might have to store file system contents for undo as well.   
tells would keep where they tell'ed from.

Is this an impossible task, or can we take a hint from the application  
side that such things are possible, and should be attempted?

I understand you would normally have to do stuff at the operating  
system level, but apparently this has been vetoed, so I'm looking for  
a modified glibc (or libc).

John