Thilo Fromm 84d7bf63b1 bootstrap_sdk: no package updates in stage 1
This change updates the stage1 SDK bootstrap build to use local
("known good") package ebuilds only, preventing updated package ebuilds
to apply in stage 1. This fixes SDK build breakage we observed when
upgrading core libraries like readline.

The change also removes the seed update from stage 1 as it should not
be needed anymore now that we postpone any package updates to stage 2.

The following package ebuild repos are used for stage 1:
- for portage-stable, we simply copy /var/gentoo/repos/gentoo
   from the SDK root.
- coreos-overlay is more complicated since ebuilds are missing from
   the SDK. So we grok the version the SDK was built with from
     /mnt/host/source/.repo/manifests/default.xml
   and then we create a local stage 1 clone of
     https://github.com/kinvolk/coreos-overlay.git
   in which we then check out the revision noted in the default mnifest.

Signed-off-by: Thilo Fromm <thilo@kinvolk.io>
2021-03-03 17:32:38 +01:00
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