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Factor out EvalCache::forceDerivation()

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This commit is contained in:
Eelco Dolstra 2020-06-29 16:39:41 +02:00
parent ca946860ce
commit b681408879
3 changed files with 20 additions and 11 deletions
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16
src/libexpr/eval-cache.cc
View file

@ -2,6 +2,7 @@
#include "sqlite.hh"
#include "eval.hh"
#include "eval-inline.hh"
#include "store-api.hh"
namespace nix::eval_cache {
@ -502,4 +503,19 @@ bool AttrCursor::isDerivation()
return aType && aType->getString() == "derivation";
}
StorePath AttrCursor::forceDerivation()
{
auto aDrvPath = getAttr(root->state.sDrvPath);
auto drvPath = root->state.store->parseStorePath(aDrvPath->getString());
if (!root->state.store->isValidPath(drvPath) && !settings.readOnlyMode) {
/* The eval cache contains 'drvPath', but the actual path has
been garbage-collected. So force it to be regenerated. */
aDrvPath->forceValue();
if (!root->state.store->isValidPath(drvPath))
throw Error("don't know how to recreate store derivation '%s'!",
root->state.store->printStorePath(drvPath));
}
return drvPath;
}
}

3
src/libexpr/eval-cache.hh
View file

@ -101,6 +101,9 @@ public:
bool isDerivation();
Value & forceValue();
/* Force creation of the .drv file in the Nix store. */
StorePath forceDerivation();
};
}

12
src/nix/installables.cc
View file

@ -444,17 +444,7 @@ std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableF
if (!attr->isDerivation())
throw Error("flake output attribute '%s' is not a derivation", attrPath);
auto aDrvPath = attr->getAttr(state->sDrvPath);
auto drvPath = state->store->parseStorePath(aDrvPath->getString());
if (!state->store->isValidPath(drvPath) && !settings.readOnlyMode) {
/* The eval cache contains 'drvPath', but the actual path
has been garbage-collected. So force it to be
regenerated. */
aDrvPath->forceValue();
if (!state->store->isValidPath(drvPath))
throw Error("don't know how to recreate store derivation '%s'!",
state->store->printStorePath(drvPath));
}
auto drvPath = attr->forceDerivation();
auto drvInfo = DerivationInfo{
std::move(drvPath),