If the deletion of `HOMEBREW_CACHE` fails then the
`.migration_attempted` file will have still been deleted so ensure it is
recreated.

It defaults to being in $HOME but we override this meaning that we would
destroy the cache every time.

* cleanup: accept cache as an argument.

* config: move default HOMEBREW_CACHE to ~/Library.

* brew.1: document new default Homebrew cache.

* update-report: migrate legacy Homebrew cache.

Prior to this change there were only 3 instances of `STD(IN|OUT|ERR)`
versus 74 instances of `$std(in|out|err)` in the Homebrew code base. The
latter variant is also strongly suggested by bbatsov's Ruby Style Guide.

Some elements already used two-space indentation and we also prefer two
spaces in our Ruby code.

Closes #306.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

Some Git versions create absolute `gitdir:` pointers in a submodule's
`.git` file, which can be problematic once the resource is staged and
causes various Git operations for those submodules to fail. Work around
this issue by fixing the submodule `.git` files after submodule update.

See Homebrew/homebrew-core#1520 for details and an affected formula.

Closes #302.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

The FTP protocol is prone to getting firewalled to death in places, so where
we know we can avoid that by using either secure or more commonly accepted
protocols let's do so.

Examples of output:

```
* Stable: ftp://ftp.cpan.org/pub/CPAN/authors/id/N/NE/NEILB/Time-Duration-1.20.tar.gz should be `http://search.cpan.org/CPAN/authors/id/N/NE/NEILB/Time-Duration-1.20.tar.gz`
* Stable: Please use https:// for ftp://ftp.mirrorservice.org/sites/lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_4.89.tar.bz2
```

mirrorservice accepts `http://ftp.mirrorservice.org` as well, apparently.

This reverts commit 7bbcf9ca.

This reverts commit 146a16d6.

These aren't targeted at end users.

You need a non-shallow clone to push branches upstream so if you often
tap and untap taps (e.g. `homebrew/boneyard`) then you need to remember
to manually `fetch -unshallow`.

Check the syntax for Homebrew/brew and don't bother for taps.

This is not a command designed for end-users.

This will almost certainly fail every time so let's disable this error.

Based on how it's used to construct URLs, the bintray "package" should
be the formula name not the formula full_name. For core formulae, there
is no difference, but that's not the case in other taps.

See https://github.com/Homebrew/homebrew-gui/pull/10



Closes #301.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

As mentioned in:
https://github.com/Homebrew/homebrew-core/pull/1396#discussion_r64774080

This adds >1m to every build on every node and it can't actually be
affected/fixed by formula PRs.

There's no more pull requests left to pull on this repository.

This job takes almost a minute and it's not useful for all core taps
to run this.

We're not really getting any more PRs here and this code makes this file
harder to follow and refactor.

This means that we do not need to read formulae or evaluate Ruby at
upload time.

Both the `CctoolsMachO` and `RubyMachO` module implement a common set of
methods that simplify querying `mach_data`. Move these into a shared
module, that gets included after either of these implementations is
loaded and included in `Pathname`.

The check that `t4` is not an external command would always succeed, but
not because the file wasn't executable, but because it wasn't even found
due to the missing `brew-` prefix.

Also change the valid but atypical file mode from 0744 to 0755 and apply
minor code style fixes.

Affects only legacy systems that don't have a `/usr/bin/cc` binary.