0b0cb18a60
When you build from a Dockerfile, it runs in a given "context"; that is the directory the Dockerfile is in and the directories below it. It can not access anything outside that context during the build. When building a container for a project in the gate, you may wish to install sibling projects that Zuul has checked-out into your container (i.e. so that Depends-On works). As mentioned, because /home/zuul/src/<project> is not in the context of the current project, you will not be able to access this source code during the container build. So to help facilitate dependencies, add a siblings: tag which can copy some or all of the required-projects already specified for the job into a special sub-directory of the current source. Because all the code is now in the same context, this will allow build scripts to be written that look for directories in .zuul-siblings and can install the source code from there. To further help the scripts, the ZUUL_SIBLINGS arg is set for the docker build giving the copied paths. The test is updated with some paths to test the copy. Change-Id: I079d823e7194e15b1b496aea0f53f70f6b563f02
Build one or more docker images.