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@@ -50,3 +50,62 @@ to be manually dealt with.
files to support many platforms, but it's not easy to automatically achieve
this in places like linux.bst where Baserock currently has many different
+BuildStream requires an initial set of sysroot binaries to "seed" its build
+sandbox. We produce suitable binaries using the `bootstrap/stage3-sysroot.bst`
+element, and host them at <https://ostree.baserock.org/releases>. These are
+then pulled by the `gnu-toolchain/base.bst` element.
+I expect that the sysroot binaries will rarely need to change as they are only
+used to bootstrap the `gnu-toolchain.bst` stack, and that stack is then used to
+build everything else. However there will occasionally need to be updates; the
+process is documented below.
+There are also detailed instructions on how to produce binaries for new platforms
+The release process needs to be done for each supported architecture. To get an
+idea of what we consider supported, look in `gnu-toolchain/base.bst`. Where you
+see `$arch` in these instructions, substitute the corresponding Baserock
+architecture name for the current platform.
+ 1. Build and checkout the sysroot binaries:
+ bst build bootstrap/stage3-sysroot.bst`
+ bst checkout bootstrap/stage3-sysroot.bst ./sysroot
+ 2. Add the provenance metadata:
+ scripts/baserock-release-metadata > ./sysroot/metadata
+ 4. Clone the releases OSTree repo locally.
+ ostree init --repo=releases --mode=archive-z2
+ ostree remote add --repo=releases \
+ origin https://ostree.baserock.org/releases/ --no-gpg-verify
+ ostree pull --repo=releases origin stage3-sysroot/$arch
+ 5. Commit the binaries to the correct branch.
+ cd sysroot
+ ostree commit --repo=../releases \
+ --branch=stage3-sysroot/$arch \
+ cd -
+ 6. Push to the releases repo. You will need an SSH key that is authorized to
+ connect as email@example.com -- contact firstname.lastname@example.org if
+ you need access. You will also need to have installed our version of
+ ostree-push --repo=./releases \
+ ssh://email@example.com:22200/ stage3-sysroot/$arch
+Once this is done you can update `base.bst` to pull in the new version of the
+binaries (the `bst track` command can help with this).
+In future we should would GPG sign the release binaries, and we would automate
+the whole process in GitLab CI.