Read the derivation from DRV-PORT and return the corresponding <derivation> object. Call READ-DERIVATION-FROM-FILE to read derivations declared as inputs of the derivation being parsed.

Most of the time you'll want to use 'read-derivation-from-file', which caches things as appropriate and is thus more efficient.

Return the list of derivation-inputs required to build DRV, recursively.

CUT? is a predicate that is passed a derivation-input and returns true to eliminate the given input and its dependencies from the search. An example of such a predicate is 'valid-derivation-input?'; when it is used as CUT?, the result is the set of prerequisites of DRV not already in valid.

Invalidate internal derivation caches. This is mostly useful for long-running processes that know what they're doing. Use with care!

Return the names of the outputs of DRV.

Return #t if DRV can be substituted.

Return the file name corresponding to MODULE, a Guile module name (a list of symbols.)

Return the list of name/path pairs of the outputs of DRV.

Return true if INPUT is valid--i.e., if all the outputs it requests are in the store.

Return the output file name of INPUT. If INPUT has more than one outputs, an error is raised.

Return the hash of DRV, modulo its fixed-output inputs, as a bytevector.