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README-development.md

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This repository uses https://docs.docker.com/develop/develop-images/multistage-build/ builds. If you're using Project Atomic/RHEL Docker, your best bet is to build OpenShift imagebuilder docker.

If you're going to iterate a lot on the host, it's recommended to stand up a persistent "pet" development container, install rpm-ostree inside that, as well as persistent OSTree repositories.

You'll also want to use the --cachedir argument to avoid repeatedly downloading RPMs. More information in the rpm-ostree docs.

Example setup (in a container, though /srv should be a persistent mount)

# mkdir -p /srv/origin-os
# cd /srv/origin-os
# mkdir cache
# git clone https://github.com/openshift/os  (or symlink it from your user's directory)
# (cd os && make repo-refresh)
# ln -s os/Makefile .
# make

Iterating more quickly with --cache-only:

# make COMPOSEFLAGS=--cache-only