feat: push --layer-format tar #2982
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Add a `--layer-format` flag for the `singularity push` command. This applies only to pushes of OCI-SIF images (including data containers). When `--layer-format` is not set, or is set to `squashfs` then the OCI-SIF image is pushed with layers in squashfs format. These can only be used by Singularity. When `--layer-format` is set to `tar` then the OCI-SIF image is pushed with its layers converted on-the-fly to TAR format. The resulting pushed image can be used by other OCI runtimes. Closes sylabs#2848
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Description of the Pull Request (PR):
Add a
--layer-formatflag for thesingularity pushcommand. This applies only to pushes of OCI-SIF images (including data containers).When
--layer-formatis not set, or is set tosquashfsthen the OCI-SIF image is pushed with layers in squashfs format. These can only be used by Singularity.When
--layer-formatis set totarthen the OCI-SIF image is pushed with its layers converted on-the-fly to TAR format. The resulting pushed image can be used by other OCI runtimes.This fixes or addresses the following GitHub issues:
Before submitting a PR, make sure you have done the following:
make checkand tested this PR locally with amake test, andmake testallif possible (see CONTRIBUTING.md).