[PATCH] zorg: jenkins: Rewrite 'derive' to be more flexible

[Chris Matthews]

Thanks. I committed with some little fixups.

> On Dec 6, 2014, at 10:44 AM, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
> 
> This patch series adds a `derive-llvm+clang` command to the
> Jenkins build.py.
> 
>  - 0001: Refactor `derive()` and `derive_lldb()` to share
>    code and stop hardcoding expectations.  Although the
>    exact rsync commands will change slightly (with some
>    redundant excludes), there should be no effective
>    functionality change.
> 
>    @Sean: you might want to check the `lldb`-related logic.
>    If you want I can leave `derive_lldb()` just as I found
>    it; maybe it's not valuable to share code there.
> 
>  - 0002: Change `check_repo_state()` to log what it finds
>    instead of giving an error when something is missing.
> 
>    IMO, the sanity check only provides value on builders
>    that aren't mature.  Builders that are "working" should
>    fail in the "acquire" step.  Logging what's going on
>    seems sufficient.
> 
>    Another approach would be to thread the set of repos
>    through the `build()` step, but I think that would be
>    pretty awkward.
> 
>  - 0003: Add `derive-llvm+clang()`.
> 
> The end goal is to enable Jenkins to checkout just llvm and
> clang for a faster incremental builder.
> 
> (I didn't find any tests... did I miss them somewhere?)
> 
> <0001-jenkins-Factor-out-hard-coded-logic-NFC.patch><0002-jenkins-Loosen-restriction-on-checked-out-repos.patch><0003-jenkins-Add-derive-llvm-clang.patch>