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fetchClosure: Allow a path to be rewritten to CA on the fly

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The advantage is that the resulting closure doesn't need to be signed,
so you don't need to configure any binary cache keys on the client.
This commit is contained in:
Eelco Dolstra 2022-03-22 21:14:58 +01:00
parent 7f6fe8ca1d
commit 545c2d0d8c
4 changed files with 150 additions and 72 deletions
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46
src/libexpr/primops/fetchClosure.cc
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@ -1,5 +1,6 @@
#include "primops.hh"
#include "store-api.hh"
#include "make-content-addressed.hh"
namespace nix {
@ -9,6 +10,8 @@ static void prim_fetchClosure(EvalState & state, const Pos & pos, Value * * args
std::optional<std::string> fromStoreUrl;
std::optional<StorePath> fromPath;
bool toCA = false;
std::optional<StorePath> toPath;
for (auto & attr : *args[0]->attrs) {
if (attr.name == "fromPath") {
@ -16,6 +19,15 @@ static void prim_fetchClosure(EvalState & state, const Pos & pos, Value * * args
fromPath = state.coerceToStorePath(*attr.pos, *attr.value, context);
}
else if (attr.name == "toPath") {
state.forceValue(*attr.value, *attr.pos);
toCA = true;
if (attr.value->type() != nString || attr.value->string.s != std::string("")) {
PathSet context;
toPath = state.coerceToStorePath(*attr.pos, *attr.value, context);
}
}
else if (attr.name == "fromStore")
fromStoreUrl = state.forceStringNoCtx(*attr.value, *attr.pos);
@ -41,21 +53,45 @@ static void prim_fetchClosure(EvalState & state, const Pos & pos, Value * * args
// FIXME: only allow some "trusted" store types (like BinaryCacheStore).
auto fromStore = openStore(*fromStoreUrl);
copyClosure(*fromStore, *state.store, RealisedPath::Set { *fromPath });
if (toCA) {
auto remappings = makeContentAddressed(*fromStore, *state.store, { *fromPath });
auto i = remappings.find(*fromPath);
assert(i != remappings.end());
if (toPath && *toPath != i->second)
throw Error({
.msg = hintfmt("rewriting '%s' to content-addressed form yielded '%s', while '%s' was expected",
state.store->printStorePath(*fromPath),
state.store->printStorePath(i->second),
state.store->printStorePath(*toPath)),
.errPos = pos
});
if (!toPath)
throw Error({
.msg = hintfmt(
"rewriting '%s' to content-addressed form yielded '%s'; "
"please set this in the 'toPath' attribute passed to 'fetchClosure'",
state.store->printStorePath(*fromPath),
state.store->printStorePath(i->second)),
.errPos = pos
});
} else {
copyClosure(*fromStore, *state.store, RealisedPath::Set { *fromPath });
toPath = fromPath;
}
/* In pure mode, require a CA path. */
if (evalSettings.pureEval) {
auto info = state.store->queryPathInfo(*fromPath);
auto info = state.store->queryPathInfo(*toPath);
if (!info->isContentAddressed(*state.store))
throw Error({
.msg = hintfmt("in pure mode, 'fetchClosure' requires a content-addressed path, which '%s' isn't",
state.store->printStorePath(*fromPath)),
state.store->printStorePath(*toPath)),
.errPos = pos
});
}
auto fromPathS = state.store->printStorePath(*fromPath);
v.mkString(fromPathS, {fromPathS});
auto toPathS = state.store->printStorePath(*toPath);
v.mkString(toPathS, {toPathS});
}
static RegisterPrimOp primop_fetchClosure({