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Step: cache-rootfs
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Create a tarball of the root filesystem in the image.
Step keys:
* `cache-rootfs` — REQUIRED; tag of root filesystem on image.
* `force` — OPTIONAL; boolean that enables overwriting of an existing rootfs
tarball by `vmdb2`, allowing the tarball to be used as both a build input and a
build output. This can be useful in multi-stage build chains where a "common base
OS" rootfs filesystem is populated and packaged as a rootfs tarball by `vmdb2`, and
this tarball is consumed by multiple downstream `vmdb2` builds that extract the
tarball into disk images that have different partition layouts and/or filesystems.
Example (in the .vmdb file):
# typical use
- cache-rootfs: root
unless: rootfs_unpacked
# create a rootfs tarball output at the end of a build process
- cache-rootfs: root
force: true
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