adf88771ff
mkfs.btrfs requires that the --compress option be used together with --rootdir, as compression only makes sense in that context (because compression is not a persistent setting). Right now, If --compress is specified without --rootdir, mkfs.btrfs fails with: ERROR: --compression must be used with --rootdir This can occur when repart is configured with Compression= but the partition populate logic doesn't use the --rootdir code path (eg. when using loop device mounting to copy files after mkfs). Add a defensive check to skip compression and emit a user-friendly warning when compression is requested but no root directory is provided. The warning message references the repart directive names (Compression= and CopyFiles=) rather than low-level mkfs options to help users understand the requirement. This prevents crashes but doesn't enable compression, that requires ensuring the --rootdir code path is used, which it currently is not and will be addressed in the next patch. Fixes: https://github.com/systemd/systemd/issues/39584
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