make brew cask install --force to redownload the file

[voanhduy1512]

As suggestion in #1692, i make brew install --force to redownload file. With this we will one step nearer to brew cask upgrade #309

[phinze]

This seems like reasonable behavior, and I'd be +1 to merge it if we can get covering tests and some docs for the option. 🎨

[rolandwalker]

👍 from me as well -- the user needs this ability -- but I think that --force is not the right interface. Some downloads are very long, and the user does not need to repeat the download merely to do a --force for other reasons.

Some alternative interfaces could be

• new option --force-download . One could also imagine --force-checksum and --force-all
• new command verb brew cask download <cask>

In part the user finds this to be a problem because downloads hang around too long, which we are starting to address in #2759. Both directions are good.

[voanhduy1512]

i wonder do --force-download must go with --force, because if i --force-download but don't --force then it just download and don't install.
So do you want --force-download included --force or we remind user to declare them together?

[voanhduy1512]

And i can provide the doc (once we solve problem above), but i don't know how to test redownload. Can you give me some advise?

[rolandwalker]

@voanhduy1512 I lost you on IRC -- call me back.

I looked up how Homebrew handles this functionality: the fetch command, documented here https://github.com/Homebrew/homebrew/blob/master/Library/Contributions/manpages/brew.1.md#commands . fetch usually happens automatically when the user gives install, but it is possible to give fetch by itself. If you give fetch --force, then it forces the download.

So for consistency with Homebrew, we should probably follow that interface. (BTW it is the same interface as the BSD port package manager.)

[voanhduy1512]

Closed this issue as interface change, see #2970