Commits on Jun 10, 2022

1. Introduce mechanism to provide resiliency for inputs changing while t… …

   …he build runs
   
   When an edge starts to run, create a temporary lock file in the build
   directory, stat it, and cache its mtime. When the command finishes, use
   the temporary lock file's mtime from when the edge started running as
   the mtime that is recorded in the build log for each of the edge's
   output(s). Subsequent runs will use that as the mtime for the output(s).
   
   This provides robustness against inputs changing while the command
   itself is running. If an input is changed, the subsequent run will
   detect the output as dirty since its recorded mtime reflects when the
   build command began, not when the output was actually written to disk.
   
   Generator and restat rules are exempt from this and will continue to
   record their actual mtime on disk at the time the command finished in
   the build log (unless the restat rule cleans the output). This avoids
   potential infinite loops when the generator rule touches input
   dependencies of the output(s) or a restat rule intentionally changes
   implicit dependencies of its output.

   

   jdrouhard committed Jun 10, 2022
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