Overhaul Xcode/CLT config and doctor checks

[jacknagel]

Clearly this has become an annoyance for debugging things. Here are my suggestions:

• Stop reporting the "guessed" Xcode version in --config for CLT-only systems. Xcode.version has to retain its current semantics for compatibility reasons, but this is an implementation detail that we don't need to expose to the user.
• Distinguish between standalone CLT and Xcode CLT in --config output
• Rework the doctor checks to avoid suggesting "reinstallng Xcode" on CLT-only systems when the CLT is outdated

[mistydemeo]

Distinguish between standalone CLT and Xcode CLT in --config output

We should start tracking version numbers for both standalone CLT and Xcode CLT.

[jacknagel]

Deconstructing a CLT version string,

CLT: 4.4.0.0.1.1249367152

at first glance the last component appears to be a timestamp, but...

[irb(main)]$ Time.at(1249367152)
 ====> Tue Aug 04 01:25:52 -0500 2009

and that last component can be seen in 4.3 and 4.4 versions of the CLT, so I'm lost.

I've tried to find listing of canonical CLT versions, but it doesn't seem to exist.

[jacknagel]

Some early cleanups here: https://github.com/jacknagel/homebrew/compare/config

[jacknagel]

Went through all the standalone CLT packages and extracted the "version" numbers of the DeveloperToolsCLI pkg:

Standalone CLT (DeveloperToolsCLI) version numbers

Xcode   Month       Version
4.5 September   4.5.0.0.1.1249367152
4.4 August      4.4.0.0.1.1249367152
4.4 July        4.4.0.0.1.1249367152
4.3 June        4.3.0.0.1.1249367152
4.3 Late March  4.3.0.0.1.1249367152
4.3 March       4.3.0.0.1.1249367152
4.3 February    1.0.0.9000000000.1.1249367152

So basically they are useless.

[jacknagel]

Kinda want to delete every xcode/clt related doctor check and start over.

[jacknagel]

Questions:

• What do the version strings for CLT-from-Xcode ("DeveloperToolsCLILeo") look like these days?
• How do we differentiate between e.g. July and August CLT when the version string is identical?

[MikeMcQuaid]

My CLT-from-Xcode is:
package-id: com.apple.pkg.DeveloperToolsCLI
version: 4.5.0.0.1.1249367152

We could differentiate between them by using a hash of a particular file (or the file list or something)?

[jacknagel]

Here's a patch that implements the first and part of the second of my initial suggestions:

https://github.com/jacknagel/homebrew/compare/config

In short, The "Xcode" line is omitted from --config output unless real Xcode is installed, which lets us easily distinguish between Xcode-only, CLT-only, and Xcode-and-CLT configurations.

[jacknagel]

Pushed 2c1ad3c. I'd still like to rework the doctor checks to be less confusing, but I'm lacking the motivation to sort that out.

[samueljohn]

Good work!