Nikita Karetnikov <nik...@karetnikov.org> skribis: >>> 1. Should the recursion stop when ‘fixed-output-derivation?’ returns #t? > >> I think so. In general fixed-output derivations are the things you >> would like to pre-fetch; so you would typically call ‘build-derivations’ >> on these to do the actual pre-fetching. > > Could you show a package with a fixed-output derivation? My current > implementation calls itself indefinitely because the base case is never > satisfied.
Any “origin” that has no patches/snippet is a fixed-output derivation. But! There was a bug in ‘fixed-output-derivation?’ (which was actually unused until now.) Fixed in 99e17dc: --8<---------------cut here---------------start------------->8--- scheme@(guile-user)> (package-source-derivation s (package-source wget)) $12 = #<derivation /gnu/store/f96502xhla1k3daikjckn2zb1l17m8r5-wget-1.15.tar.xz.drv => /gnu/store/qz9vm8802v6pi69ci2kgnvfivrkr085r-wget-1.15.tar.xz 2d1e730> scheme@(guile-user)> (fixed-output-derivation? $12) $13 = #t --8<---------------cut here---------------end--------------->8--- Thanks! Ludo’.
