{"action":"created","comment":{"url":"https://api.github.com/repos/openshift/origin/pulls/comments/170491355","pull_request_review_id":99182045,"id":170491355,"diff_hunk":"@@ -609,16 +609,33 @@ type BuildSource struct {\n \tSecrets []SecretBuildSource\n }\n \n-// ImageSource describes an image that is used as source for the build\n+// ImageSource is used to describe build source that will be extracted from an image or used during a\n+// multi stage build. A reference of type ImageStreamTag, ImageStreamImage or DockerImage may be used.\n+// A pull secret can be specified to pull the image from an external registry or override the default\n+// service account secret if pulling from the internal registry. Image sources can either be used to\n+// extract content from an image and place it into the build context along with the repository source,\n+// or used directly during a multi-stage Docker build to allow content to be copied without overwriting\n+// the contents of the repository source (see the 'paths' and 'as' fields).\n type ImageSource struct {\n-\t// From is a reference to an ImageStreamTag, ImageStreamImage, or DockerImage to\n+\t// from is a reference to an ImageStreamTag, ImageStreamImage, or DockerImage to\n \t// copy source from.\n \tFrom kapi.ObjectReference\n \n-\t// Paths is a list of source and destination paths to copy from the image.\n+\t// A list of image names that this source will be used in place of during a multi-stage Docker image\n+\t// build. For instance, a Dockerfile that uses \"COPY --from=nginx:latest\" will first check for an image\n+\t// source that has \"nginx:latest\" in this field before attempting to pull directly. If the Dockerfile\n+\t// does not reference an image source it is ignored. This field and paths may both be set, in which case\n+\t// the contents will be used twice.\n+\t// +optional\n+\tAs []string\n+\n+\t// paths is a list of source and destination paths to copy from the image. This content will be copied\n+\t// into the build context prior to starting the build. If no paths are set, the build context will\n+\t// not be altered.\n+\t// +optional","path":"pkg/build/apis/build/types.go","position":30,"original_position":30,"commit_id":"22cb127b32e234f7d0a16bcd7b60e8ad6297978e","original_commit_id":"68319da90e7c0a016ad9a8387b96e7dd8d1ac8e6","user":{"login":"smarterclayton","id":1163175,"avatar_url":"https://avatars0.githubusercontent.com/u/1163175?v=4","gravatar_id":"","url":"https://api.github.com/users/smarterclayton","html_url":"https://github.com/smarterclayton","followers_url":"https://api.github.com/users/smarterclayton/followers","following_url":"https://api.github.com/users/smarterclayton/following{/other_user}","gists_url":"https://api.github.com/users/smarterclayton/gists{/gist_id}","starred_url":"https://api.github.com/users/smarterclayton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/smarterclayton/subscriptions","organizations_url":"https://api.github.com/users/smarterclayton/orgs","repos_url":"https://api.github.com/users/smarterclayton/repos","events_url":"https://api.github.com/users/smarterclayton/events{/privacy}","received_events_url":"https://api.github.com/users/smarterclayton/received_events","type":"User","site_admin":false},"body":"Went over all the uses of image paths - there weren't many.  We didn't actually ever require them to be set that I could 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