Pipelines encode which source content they need in the form of
repository metadata checksums (or rpm checksums). In addition, they
encode where they fetch that source content from in the form of URLs.
This is overly specific and doesn't have to be in the pipeline's hash:
the checksum is enough to specify an image.
In practice, this precluded using alternative ways of getting at source
packages, such as local mirrors, which could speed up development.
Introduce a new osbuild API: sources. With it, a stage can query for a
way to fetch source content based on checksums.
The first such source is `org.osbuild.dnf`, which returns repository
configuration for a metadata checksum. Note that the dnf stage continues
to verify that the content it received matches the checksum it expects.
Sources are implemented as programs, living in a `sources` directory.
They are run on the host (i.e., uncontained) right now. Each source gets
passed options, which are taken from a new command line argument to
osbuild, and an array of checksums for which to return content.
This API is only available to stages right now.
Commit 283281f broke compression by appending the argument last to the
tar command line. It needs to appear before the file.
Fix that and add a test.
[teg: add minor fix]
We've been using a generic `osbuild-run`, which sets up the build
environment (and works around bugs) for all build roots. It is already
getting unwieldy, because it tries to detect the OS for some things it
configures. It's also about to cause problems for RHEL, which doesn't
currently support a python3 shebang without having /etc around.
This patch changes the `build` key in a pipeline to not be a pipeline
itself, but an object with `runner` and `pipeline` keys. `pipeline` is
the build pipeline, as before. `runner` is the name of the runner to
use. Runners are programs in the `runners` subdirectory.
Three runners are included in this patch. They're copies of osbuild-run
for now (except some additions for rhel82). The idea is that each of
them only contains the minimal setup code necessary for an OS, and that
we can review what's needed when updating a build root.
Also modify the `--build-pipeline` command line switch to accept such a
build object (instead of a pipeline) and rename it accordingly, to
`--build-env`.
Correspondingly, `OSBUILD_TEST_BUILD_PIPELINE` → `OSBUILD_TEST_BUILD_ENV`.
Downloading the gpg key is fragile and kept causing our tests to fail.
In general, we want to limit the network access, so let's just embed
the gpg keys directly in the pipeline.
Fixes#133.
Signed-off-by: Tom Gundersen <teg@jklm.no>
