"The primary use case for system images are immutable environments where debugging and development tools shall optionally be made available, but not included in

"The primary use case for system images are immutable environments where debugging and development tools shall optionally be made available, but not included in the immutable base OS image itself (e.g. strace and gdb shall be an optionally installable addition in order to make debugging/development easier). System extension images should not be misunderstood as a generic software packaging framework, as no dependency scheme is available: system extensions should carry all files they need themselves, except for those already shipped in the underlying host system image. Typically, system extension images are built at the same time as the base OS image — within the same build system." https://www.freedesktop.org/software/systemd/man/systemd-sysext.html https://www.freedesktop.org/software/systemd/man/systemd-sys...