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Add "nix show-derivation"

This debug command prints a store derivation in JSON format. For
example:

  $ nix show-derivation nixpkgs.hello
  {
    "/nix/store/ayjwpwwiyy04nh9z71rsdgd3q7bra7ch-hello-2.10.drv": {
      "outputs": {
        "out": {
          "path": "/nix/store/w5w4v29ql0qwqhczkdxs94ix2lh7ibgs-hello-2.10"
        }
      },
      "inputSrcs": [
        "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
      ],
      "inputDrvs": {
        "/nix/store/13839aqdf6x4k3b785rw5f2l7857l6y3-bash-4.4-p12.drv": [
          "out"
        ],
        "/nix/store/vgdx7fdc7d4iirmnwj2py1nrvr5qwzj7-hello-2.10.tar.gz.drv": [
          "out"
        ],
        "/nix/store/x3kkd0vsqfflbvwf1055l9mr39bg0ms0-stdenv.drv": [
          "out"
        ]
      },
      "platform": "x86_64-linux",
      "builder": "/nix/store/qp5fw57d38bd1n07ss4zxh88zg67c3vg-bash-4.4-p12/bin/bash",
      "args": [
        "-e",
        "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
      ],
      "env": {
        "buildInputs": "",
        "builder": "/nix/store/qp5fw57d38bd1n07ss4zxh88zg67c3vg-bash-4.4-p12/bin/bash",
        "configureFlags": "",
        "doCheck": "1",
        "name": "hello-2.10",
        "nativeBuildInputs": "",
        "out": "/nix/store/w5w4v29ql0qwqhczkdxs94ix2lh7ibgs-hello-2.10",
        "propagatedBuildInputs": "",
        "propagatedNativeBuildInputs": "",
        "src": "/nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz",
        "stdenv": "/nix/store/6zngq1rdh0ans9qyckqimqibgnlvlfrm-stdenv",
        "system": "x86_64-linux"
      }
    }
  }

This removes the need for pp-aterm.
  • Loading branch information...
edolstra committed Sep 25, 2017
1 parent e350671 commit e8d6ee7c1b90a2fe6d824f1a875acc56799ae6e2
Showing with 147 additions and 0 deletions.
  1. +4 −0 src/nix/command.hh
  2. +24 −0 src/nix/installables.cc
  3. +119 −0 src/nix/show-derivation.cc
@@ -207,4 +207,8 @@ PathSet toStorePaths(ref<Store> store, RealiseMode mode,
Path toStorePath(ref<Store> store, RealiseMode mode,
std::shared_ptr<Installable> installable);
PathSet toDerivations(ref<Store> store,
std::vector<std::shared_ptr<Installable>> installables,
bool useDeriver = false);
}
@@ -303,6 +303,30 @@ Path toStorePath(ref<Store> store, RealiseMode mode,
return *paths.begin();
}
PathSet toDerivations(ref<Store> store,
std::vector<std::shared_ptr<Installable>> installables, bool useDeriver)
{
PathSet drvPaths;
for (auto & i : installables)
for (auto & b : i->toBuildables()) {
if (b.drvPath.empty()) {
if (!useDeriver)
throw Error("argument '%s' did not evaluate to a derivation", i->what());
for (auto & output : b.outputs) {
auto derivers = store->queryValidDerivers(output.second);
if (derivers.empty())
throw Error("'%s' does not have a known deriver", i->what());
// FIXME: use all derivers?
drvPaths.insert(*derivers.begin());
}
} else
drvPaths.insert(b.drvPath);
}
return drvPaths;
}
void InstallablesCommand::prepare()
{
installables = parseInstallables(*this, getStore(), _installables, useDefaultInstallables());
@@ -0,0 +1,119 @@
// FIXME: integrate this with nix path-info?
#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()
{
mkFlag()
.longName("recursive")
.shortName('r')
.description("include the dependencies of the specified derivations")
.set(&recursive, true);
}
std::string name() override
{
return "show-derivation";
}
std::string description() override
{
return "show the contents of a store derivation";
}
Examples examples() override
{
return {
Example{
"To show the store derivation that results from evaluating the Hello package:",
"nix show-derivation nixpkgs.hello"
},
Example{
"To show the full derivation graph (if available) that produced your NixOS system:",
"nix show-derivation -r /run/current-system"
},
};
}
void run(ref<Store> store) override
{
auto drvPaths = toDerivations(store, installables, true);
if (recursive) {
PathSet closure;
store->computeFSClosure(drvPaths, closure);
drvPaths = closure;
}
{
JSONObject jsonRoot(std::cout, true);
for (auto & drvPath : drvPaths) {
if (!isDerivation(drvPath)) continue;
auto drvObj(jsonRoot.object(drvPath));
auto drv = readDerivation(drvPath);
{
auto outputsObj(drvObj.object("outputs"));
for (auto & output : drv.outputs) {
auto outputObj(outputsObj.object(output.first));
outputObj.attr("path", output.second.path);
if (output.second.hash != "") {
outputObj.attr("hashAlgo", output.second.hashAlgo);
outputObj.attr("hash", output.second.hash);
}
}
}
{
auto inputsList(drvObj.list("inputSrcs"));
for (auto & input : drv.inputSrcs)
inputsList.elem(input);
}
{
auto inputDrvsObj(drvObj.object("inputDrvs"));
for (auto & input : drv.inputDrvs) {
auto inputList(inputDrvsObj.list(input.first));
for (auto & outputId : input.second)
inputList.elem(outputId);
}
}
drvObj.attr("platform", 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 RegisterCommand r1(make_ref<CmdShowDerivation>());

1 comment on commit e8d6ee7

@copumpkin

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copumpkin commented on e8d6ee7 Sep 25, 2017

OMG ❤️❤️❤️❤️❤️❤️

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