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OSBuild - Build-Pipelines for Operating System Artifacts

CHANGES WITH 10:

    * A new man-page `osbuild-manifest(5)` is available, which describes
      the input format of the JSON manifest that `osbuild` expects.

    * Man-pages can now be built via `make man`. This supports `SRCDIR` and
      `BUILDDIR` variables to build out-of-tree.

    * Temporary objects in the object-store are now created in
      `.osbuild/tmp/`, rather than in the top-level directory. This should
      help cleaning up temporary objects after a crash. If no osbuild
      process is running, the `tmp/` subdirectory should not exist.

    * The final stage of a build-pipeline is no longer automatically
      committed. You must pass checkpoints via `--checkpoint` to commit
      anything to the store.

    * Improve curl timeout handling. This should improve osbuild behavior
      with slow or bad mirrors and make sure operations are retried
      correctly, or time-out if no progress is made.

    Contributions from: Christian Kellner, David Rheinsberg, Lars Karlitski,
                        Major Hayden, Tom Gundersen

    - Berlin, 2020-03-18

CHANGES WITH 9:

    * The last pipeline stage is no longer automatically committed to the
      store. This used to be a special case to make things work, but it has
      now been properly fixed.
      From now on, if you want a stage committed to the store, you need to
      pass a `--checkpoint` option for the stage.

    * The runner for the host system is now auto-detected. The
      `runners/org.osbuild.default` symlink is now longer required (nor
      supported).

    * A generic runner named `org.osbuild.linux` was added. This runner
      uses the default value of `ID` in `/etc/os-release`. That is, if the
      local OS cannot be detected, or if no `os-release` file is provided,
      this is the fallback runner that is used.
      This runner only performs the bare minimum of initialization. It is
      enough to run the most basic stages on all systems we tested.

    * On Archlinux, the generic runner will now be used.

    * A new runner for RHEL-8.1 is available.

    * The JSON input to `osbuild` is now a monolithic manifest format which
      contains all build information. For now, this means the input
      manifest can contain a `pipeline:` key with the pipeline definition,
      as well as a `sources:` key with external source definitions
      previously passed via `--sources`.
      The old input format is still supported, but will be dropped in the
      next release.

    * The osbuild sources now come with a man-page `osbuild(1)`. Further
      pages will follow in the future.

    Contributions from: Christian Kellner, David Rheinsberg, Jacob Kozol,
                        Lars Karlitski, Major Hayden, Martin Sehnoutka, Tom
                        Gundersen

    - Berlin, 2020-03-05

CHANGES BEFORE 9:

    * Initial implementation of 'osbuild'.

    Contributions from: Brian C. Lane, Christian Kellner, David Rheinsberg,
                        Jacob Kozol, Lars Karlitski, Major Hayden, Martin
                        Sehnoutka, Ondřej Budai, Sehny, Tom Gundersen,
                        Tomas Tomecek, Will Woods