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Markus Hilger
875d87332c
An image meant to build without network access must contain every package build checks for, and that list differs by distribution, version and architecture and changes between releases. build --containerfile writes a Containerfile, or with --apptainer an Apptainer definition file, generated from the same package lists, including -p, -a and --selinux, so it cannot drift from what build expects. The OS is that of the -s distribution or of the build system, as for a build. --arch names the matching build platform and --from replaces the default base image. -r is refused, the image installs from the repositories of its base image. The generated EL file installs full coreutils instead of the coreutils-single of container bases, and the Ubuntu file cleans the apt cache.