Switch libselinux to runtime optional via dlopen#4441
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libselinux is built in most distros, but it is seldomly needed at runtime (e.g.: it is not used by default on Debian/Ubuntu). In order to allow building small images from the same packages, switch it to runtime optional by using dlopen(), and gracefully fallback if the library is not found. If libsystemd headers are available at build time stamp the ELF binaries using the ELF dlopen metadata format as defined by: https://uapi-group.org/specifications/specs/elf_dlopen_metadata/ so that packaging tools for rpm/deb can automatically derive dependencies for it. The implementation follows the same pattern already used for libcryptsetup for consistency.
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Currently libselinux is mandatory for systemd (as in pid1) because of dependency chain through libmount. By making it dlopen-optional, the chain is broken, and systemd can run with only libmount and glibc, and no other mandatory dependency, even for fully-featured builds. |
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libselinux is built in most distros, but it is seldomly needed at runtime (e.g.: it is not used by default on Debian/Ubuntu). In order to allow building small images from the same packages, switch it to runtime optional by using dlopen(), and gracefully fallback if the library is not found.
If libsystemd headers are available at build time stamp the ELF binaries using the ELF dlopen metadata format as defined by: https://uapi-group.org/specifications/specs/elf_dlopen_metadata/ so that packaging tools for rpm/deb can automatically derive dependencies for it.
The implementation follows the same pattern already used for libcryptsetup for consistency.