When I see posts like this, one of 3 things happens.

1. I look at the problem and think it looks like obvious homework, in which case I silently agree.
2. I look at the problme and think that it doesn't look like obvious homework, in which case I disagree and often post.
3. I look at the problem and think it is unclear whether it is possibly not homework. What I do then is somewhat random.

I look at this and definitely think it is not homework.

My criteria for something looking like obvious homework is that it looks like homework if it is a well-specified problem, that looks somewhat artificial (eg a dead giveaway is that it says you must approach it with tactic X), which clearly will have a straightforward "set-piece" solution. The above problem looks pretty well specified, is a problem I could easily see coming up in real life, and does not have a clear set-piece solution. (FWIW CPAN's real life solution to almost this exact problem is to have the user send a compressed tar which is exploded on the server.) Therefore I don't think it looks much like homework.

I am honestly curious. By what criteria would you think that this looked like homework? There seem to be a lot of people who want to jump on a bandwagon and yell Homework! with no real reason. :-(

UPDATE
And if you are going to admit your mistake, please, please, please just add an UPDATE but leave your original message. "Changing history out from under people" is something that I happen to strongly dislike having done without good reason.