storagectl's mount.storage helper bundles "open StorageProvider socket + Acquire() + dispatch reply + take fd" inline. Future consumers (systemd-vmspawn boot-time --bind-volume, machinectl bind-volume) need the same dance. Factor it into a single libshared helper that takes the Acquire() parameters by value and returns the fd plus the actual type/read-only flags. Library code, so no logging — varlink errors are surfaced via sd_varlink_error_to_errno() and the StorageProvider error_id is returned to the caller via reterr_error_id (caller decides how to format messages). Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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