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As part of allowing different types of oci images to be created,
we split our IMG_cmd into .inc files that can then be specific to
the selected type.
For the umoci backend: We can take the same options as sloci
expects and use umoci to create images.
The resulting OCI image is similar, but by using umoci, we set
the stage to do multi-tag, or multi-layer images in the future.
But for now, we are functionally equivalent to the sloci backend.
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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This image class creates an oci image spec directory from a generated
rootfs. The contents of the rootfs do not matter (i.e. they need not be
container optimized), but by using the container image type and small
footprint images, we can create directly executable container images.
Once the tarball (or oci image directory) has been created of the OCI
image, it can be manipulated by standard tools. For example, to create a
runtime bundle from the oci image, the following can be done:
Assuming the image name is "container-base":
If the oci image was a tarball, extract it (skip, if a directory is being directly used)
% tar xvf container-base-<arch>-<stamp>.rootfs-oci-latest-x86_64-linux.oci-image.tar
And then create the bundle:
% oci-image-tool create --ref name=latest container-base-<arch>-<stamp>.rootfs-oci container-base-oci-bundle
Or to copy (push) the oci image to a docker registry, skopeo can be used (vary the
tag based on the created oci image:
% skopeo copy --dest-creds <username>:<password> oci:container-base-<arch>-<stamp>:latest docker://zeddii/container-base
The following image variables are available to customize the details
of the constructed image (defaults as shown):
OCI_IMAGE_AUTHOR ?= "${PATCH_GIT_USER_NAME}"
OCI_IMAGE_AUTHOR_EMAIL ?= "${PATCH_GIT_USER_EMAIL}"
OCI_IMAGE_TAG ?= "latest"
OCI_IMAGE_RUNTIME_UID ?= ""
OCI_IMAGE_ARCH ?= "${TARGET_ARCH}"
OCI_IMAGE_SUBARCH ?= "${@oci_map_subarch(d.getVar('TARGET_ARCH'), d.getVar('TUNE_FEATURES'), d)}"
OCI_IMAGE_ENTRYPOINT ?= "sh"
OCI_IMAGE_ENTRYPOINT_ARGS ?= ""
OCI_IMAGE_WORKINGDIR ?= ""
//List of ports to expose from a container running this image:
//PORT[/PROT]
// format: <port>/tcp, <port>/udp, or <port> (same as <port>/tcp).
OICI_IMAGE_PORTS ?= ""
// key=value list of labels
OCI_IMAGE_LABELS ?= ""
// key=value list of environment variables
OCI_IMAGE_ENV_VARS ?= ""
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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