From 79c169d1c615211af69c1cbc6218f7465a4f81ed Mon Sep 17 00:00:00 2001 From: Matthew Bauer Date: Fri, 12 Jun 2020 09:49:09 -0500 Subject: Allow substituting from different storeDir Substituters can substitute from one store dir to another with a little bit of help. The store api just needs to have a CA so it can recompute the store path based on the new store dir. We can only do this for fixed output derivations with no references, though. --- src/libstore/local-store.cc | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'src/libstore/local-store.cc') diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc index 80851b591..6385453cc 100644 --- a/src/libstore/local-store.cc +++ b/src/libstore/local-store.cc @@ -855,16 +855,24 @@ StorePathSet LocalStore::querySubstitutablePaths(const StorePathSet & paths) void LocalStore::querySubstitutablePathInfos(const StorePathSet & paths, - SubstitutablePathInfos & infos) + SubstitutablePathInfos & infos, std::map pathsCA) { if (!settings.useSubstitutes) return; for (auto & sub : getDefaultSubstituters()) { - if (sub->storeDir != storeDir) continue; - for (auto & path : paths) { - if (infos.count(path)) continue; + for (auto & path_ : paths) { + auto path(path_.clone()); debug("checking substituter '%s' for path '%s'", sub->getUri(), printStorePath(path)); try { auto info = sub->queryPathInfo(path); + + auto ca = pathsCA.find(printStorePath(path)); + if (sub->storeDir != storeDir && info->references.empty() && ca != pathsCA.end()) { + if (!hasPrefix(ca->second, "fixed:")) + continue; + // recompute store path so that we can use a fixed output ca + path = sub->makeStorePath("output:out", hashString(htSHA256, ca->second), path.name()); + } else continue; + auto narInfo = std::dynamic_pointer_cast( std::shared_ptr(info)); infos.insert_or_assign(path.clone(), SubstitutablePathInfo{ -- cgit v1.2.3