The download strategy will print the cached location if we've already
fetched it, so avoid printing redundant information.
Also just "puts" it instead of using a second `ohai` line.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
Mirrors can now be declared using the `mirror` method which works similar to
`depends_on` and takes the same arguments as `url`.
The formula class now has a public `fetch` method that cycles through the
mirror list if the downloader for the primary URL throws a `DownloadError`.
Other brew commands, like brew-fetch, also benefit from mirror support by using
this method.
ClosesHomebrew/homebrew#7574.
`brew fetch --force` was a no-op for formula pathnames when that formula
did not exist in Library/Formula, because `brew --cache #{f.name}`
results in an error for that case.
Fix it by always using f.cached_download.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
