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On ZFS-on-root, statx() across sibling services'
/var/tmp/systemd-private-*/tmp mounts returns errno 132 (ENOTNAM).
This produces 10-30 journal errors per boot and causes
systemd-tmpfiles-clean.service to fail every periodic run
(exit 73 / CANTCREAT). Running tmpfiles inside its own mount
namespace avoids traversing sibling private-tmp paths.
install_zfs() now calls configure_tmpfiles_private_tmp() between
configure_zfs_tools and sync_efi_partitions, so the genesis snapshot
captures the drop-ins. Btrfs path is untouched — errno 132 is
ZFS-specific.
The drop-in file-writing is factored into install_dropin() in
lib/common.sh (service, name, root; body from stdin). Six bats tests
exercise path, content, directory permissions, idempotent overwrite,
empty content, and special-character preservation.
Full root-cause write-up and verification steps in
docs/zfs-tmpfiles-private-tmp-fix.md.
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