Commits on Aug 7, 2023

1. Avoid unnecessary map allocation when writing progress …

   `MultiWriter` would create an unnecessary map allocation when the
   `Write` method was used. The `Write` method would create a progress
   object with the meta field initialized to the meta field of the writer
   itself. It then invoked its own `WriteRawProgress` method which would
   see two maps with the metadata and erroneously believe that they were
   different and needed to be merged into a single metadata map.
   
   Since this map is initialized with the metadata of the writer before
   `WriteRawProgress` is invoked, this merge was unnecessary and could add
   a lot of unnecessary memory allocations during a build.
   
   This changes the `MultiWriter.Write` method to invoke the private
   `writeRawProgress` which performs the actual write and avoids the
   metadata merge.
   
   Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

   

   jsternberg committed Aug 7, 2023
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