Commits on May 3, 2017

1. main: synchronize writes to VT100-faker on Windows …

   We use a third-party library "colorable" to translate VT100 color
   sequences into Windows console attribute-setting calls when Terraform is
   running on Windows.
   
   colorable is not concurrency-safe for multiple writes to the same console,
   because it writes to the console one character at a time and so two
   concurrent writers get their characters interleaved, creating unreadable
   garble.
   
   Here we wrap around it a synchronization mechanism to ensure that there
   can be only one Write call outstanding across both stderr and stdout,
   mimicking the usual behavior we expect (when stderr/stdout are a normal
   file handle) of each Write being completed atomically.

   

   apparentlymart committed May 3, 2017
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