mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-09-21 17:08:04 +03:00
5cd72598fe
Impure derivations are derivations that can produce a different result
every time they're built. Example:
stdenv.mkDerivation {
name = "impure";
__impure = true; # marks this derivation as impure
outputHashAlgo = "sha256";
outputHashMode = "recursive";
buildCommand = "date > $out";
};
Some important characteristics:
* This requires the 'impure-derivations' experimental feature.
* Impure derivations are not "cached". Thus, running "nix-build" on
the example above multiple times will cause a rebuild every time.
* They are implemented similar to CA derivations, i.e. the output is
moved to a content-addressed path in the store. The difference is
that we don't register a realisation in the Nix database.
* Pure derivations are not allowed to depend on impure derivations. In
the future fixed-output derivations will be allowed to depend on
impure derivations, thus forming an "impurity barrier" in the
dependency graph.
* When sandboxing is enabled, impure derivations can access the
network in the same way as fixed-output derivations. In relaxed
sandboxing mode, they can access the local filesystem.
126 lines
4.1 KiB
C++
126 lines
4.1 KiB
C++
// FIXME: integrate this with nix path-info?
|
|
// FIXME: rename to 'nix store show-derivation' or 'nix debug show-derivation'?
|
|
|
|
#include "command.hh"
|
|
#include "common-args.hh"
|
|
#include "store-api.hh"
|
|
#include "archive.hh"
|
|
#include "json.hh"
|
|
#include "derivations.hh"
|
|
|
|
using namespace nix;
|
|
|
|
struct CmdShowDerivation : InstallablesCommand
|
|
{
|
|
bool recursive = false;
|
|
|
|
CmdShowDerivation()
|
|
{
|
|
addFlag({
|
|
.longName = "recursive",
|
|
.shortName = 'r',
|
|
.description = "Include the dependencies of the specified derivations.",
|
|
.handler = {&recursive, true}
|
|
});
|
|
}
|
|
|
|
std::string description() override
|
|
{
|
|
return "show the contents of a store derivation";
|
|
}
|
|
|
|
std::string doc() override
|
|
{
|
|
return
|
|
#include "show-derivation.md"
|
|
;
|
|
}
|
|
|
|
Category category() override { return catUtility; }
|
|
|
|
void run(ref<Store> store) override
|
|
{
|
|
auto drvPaths = Installable::toDerivations(store, installables, true);
|
|
|
|
if (recursive) {
|
|
StorePathSet closure;
|
|
store->computeFSClosure(drvPaths, closure);
|
|
drvPaths = std::move(closure);
|
|
}
|
|
|
|
{
|
|
|
|
JSONObject jsonRoot(std::cout, true);
|
|
|
|
for (auto & drvPath : drvPaths) {
|
|
if (!drvPath.isDerivation()) continue;
|
|
|
|
auto drvObj(jsonRoot.object(store->printStorePath(drvPath)));
|
|
|
|
auto drv = store->readDerivation(drvPath);
|
|
|
|
{
|
|
auto outputsObj(drvObj.object("outputs"));
|
|
for (auto & [_outputName, output] : drv.outputs) {
|
|
auto & outputName = _outputName; // work around clang bug
|
|
auto outputObj { outputsObj.object(outputName) };
|
|
std::visit(overloaded {
|
|
[&](const DerivationOutput::InputAddressed & doi) {
|
|
outputObj.attr("path", store->printStorePath(doi.path));
|
|
},
|
|
[&](const DerivationOutput::CAFixed & dof) {
|
|
outputObj.attr("path", store->printStorePath(dof.path(*store, drv.name, outputName)));
|
|
outputObj.attr("hashAlgo", dof.hash.printMethodAlgo());
|
|
outputObj.attr("hash", dof.hash.hash.to_string(Base16, false));
|
|
},
|
|
[&](const DerivationOutput::CAFloating & dof) {
|
|
outputObj.attr("hashAlgo", makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType));
|
|
},
|
|
[&](const DerivationOutput::Deferred &) {},
|
|
[&](const DerivationOutput::Impure & doi) {
|
|
outputObj.attr("hashAlgo", makeFileIngestionPrefix(doi.method) + printHashType(doi.hashType));
|
|
outputObj.attr("impure", true);
|
|
},
|
|
}, output.raw());
|
|
}
|
|
}
|
|
|
|
{
|
|
auto inputsList(drvObj.list("inputSrcs"));
|
|
for (auto & input : drv.inputSrcs)
|
|
inputsList.elem(store->printStorePath(input));
|
|
}
|
|
|
|
{
|
|
auto inputDrvsObj(drvObj.object("inputDrvs"));
|
|
for (auto & input : drv.inputDrvs) {
|
|
auto inputList(inputDrvsObj.list(store->printStorePath(input.first)));
|
|
for (auto & outputId : input.second)
|
|
inputList.elem(outputId);
|
|
}
|
|
}
|
|
|
|
drvObj.attr("system", drv.platform);
|
|
drvObj.attr("builder", drv.builder);
|
|
|
|
{
|
|
auto argsList(drvObj.list("args"));
|
|
for (auto & arg : drv.args)
|
|
argsList.elem(arg);
|
|
}
|
|
|
|
{
|
|
auto envObj(drvObj.object("env"));
|
|
for (auto & var : drv.env)
|
|
envObj.attr(var.first, var.second);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
std::cout << "\n";
|
|
}
|
|
};
|
|
|
|
static auto rCmdShowDerivation = registerCommand<CmdShowDerivation>("show-derivation");
|