From 1d1c3691d2fdf5aad0baceadd8596f23c1e0e1fa Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 10 Jul 2003 15:11:48 +0000 Subject: * The policy-free derivate sharing now *almost* works. :-) For any hash for which no local expansion is available, Nix can execute a `substitute' which should produce a path with such a hash. This is policy-free since Nix does not in any way specify how the substitute should work, i.e., it's an arbitrary (unnormalised) fstate expression. For example, `nix-pull' registers substitutes that fetch Nix archives from the network (through `wget') and unpack them, but any other method is possible as well. This is an improvement over the old Nix sharing scheme, which had a policy (fetching through `wget') built in. The sharing scheme doesn't work completely yet because successors from fstate rewriting have to be registered on the receiving side. Probably the whole successor stuff can be folded up into the substitute mechanism; this would be a nice simplification. --- src/fstate.cc | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'src/fstate.cc') diff --git a/src/fstate.cc b/src/fstate.cc index fdd43d1b1384..97532c162c1f 100644 --- a/src/fstate.cc +++ b/src/fstate.cc @@ -147,6 +147,12 @@ Hash hashTerm(ATerm t) } +FState hash2fstate(Hash hash) +{ + return ATmake("Include()", ((string) hash).c_str()); +} + + ATerm termFromHash(const Hash & hash, string * p) { string path = expandHash(hash); -- cgit 1.4.1