Commits on Aug 27, 2018

1. Snapshot only specific files for COPY …

   Before GoogleContainerTools#289 was merged, when copying over directories for COPY kaniko
   would get a list of all files at the destination specified and add them
   to the list of files to be snapshotted. If the destination was root it
   would add all files. This worked because the snapshotter made sure the
   file had been changed before adding it to the layer.
   
   After GoogleContainerTools#289, we changed the logic to add all files snapshotted to a layer
   without checking if the files had been changed. This created the bug in
   got all the files at root and added them to the layer without checking
   if they had been changed.
   
   This change should fix this bug. Now, the CopyDir function returns a
   list of files it copied over and only those files are added to the list
   of files to be snapshotted.
   
   Should fix GoogleContainerTools#314

   Priya Wadhwa committed Aug 27, 2018
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2. Add specific files from tar archives to list of snapshotted filesa …

   I changed UnpackLocalTarArchive to return a list of files that were
   extracted, so that the list of snapshotted files for ADD is more
   accurate. Previously, we used to add all files in the extracted dir to
   be snapshotted, but this could result in preexisting files being
   snapshotted again.

   Priya Wadhwa committed Aug 27, 2018
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