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README.md: Document how to update packages

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The best practice established in this repository is to reset the
package	folder and import a new	version	from upstream without
modifications. In a separate commit the downstream changes are applied.
This makes it clear which downstream changes need to be	ported when
updating to a newer version in the future. Unfortunately this is not
always done which causes confusion and more work. As first step
document the process before we later look into more automation.
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sdk_container/src/third_party/coreos-overlay/README.md vendored
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@ -30,3 +30,28 @@ that belong in the OEM partition. Any RDEPENDS from these packages should
be copied to the RDEPENDS in `board-packages` to ensure they are built. be copied to the RDEPENDS in `board-packages` to ensure they are built.
`coreos-base/coreos-oem-*` are metapackages for OEM specific ACIs. `coreos-base/coreos-oem-*` are metapackages for OEM specific ACIs.
# Updating
To update follow the following steps:
* Remove or rename the whole folder of the package to prepare the import from
upstream Gentoo, not only resetting the ebuild file but also any additional
files like patches or downstream additions under `files`.
* Run `~/trunk/src/scripts/update_ebuilds --portage_stable . CATEGORY/PACKAGE`
in the `coreos-overlay` folder to import a new version from upstream Gentoo.
Drop the ebuild files that you don't plan to use.
* Commit the changes with a message like `CATEGORY/PACKAGE: Sync from Gentoo`,
and mention the the commit ID in the body (`git show update_ebuilds/master`).
* Now find all downstream patches for the package by running
`git log CATEGORY/PACKAGE`. If everybody followed the process of resetting
before importing an upstream update, you only have to look for the commits
after the last update and port them to the new version. Otherwise you have
to compare the files manually to their upstream versions from older
[portage](https://github.com/gentoo/portage/) revisions.
* You can combine all old and new downstream patches into a single new commit
with the message `CATEGORY/PACKAGE: Apply Flatcar patches` to keep the number of
commits to port low, or have separate commits. Make sure that you explain
the changes and carry the explanations from old commits over, either in the
commit message, through comments in the ebuild file, or through a `README.md`
in the folder.