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Allow substituting from different storeDir

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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.
This commit is contained in:
Matthew Bauer 2020-06-12 09:49:09 -05:00
parent d558fb98f6
commit 79c169d1c6
7 changed files with 50 additions and 9 deletions
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7
src/libstore/store-api.cc
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@ -580,6 +580,13 @@ void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
uint64_t total = 0;
// recompute store path on the chance dstStore does it differently
if (hasPrefix(info->ca, "fixed:") && info->references.empty()) {
auto info2 = make_ref<ValidPathInfo>(*info);
info2->path = dstStore->makeStorePath("output:out", hashString(htSHA256, info->ca), storePath.name());
info = info2;
}
if (!info->narHash) {
StringSink sink;
srcStore->narFromPath({storePath}, sink);