Function operations_for 

pub fn operations_for(
    target: &Utf8Path,
    files: &[(Utf8PathBuf, Vec<u8>)],
    declaration: &Declaration,
    profile: ProfileId,
    recorded_managed: &[(String, Sha256)],
) -> Result<Derived, AppError>

Every write one target state implies, and the bytes each one lands.

A destination that already holds the bytes is not an operation: a plan that listed it would tell an operator something would change when nothing would.

Errors

AppError::Refused for a destination no operation may name, and I/O errors reading what the target holds now.