lix/src/nix/build.cc
Eelco Dolstra 990b5b2dcf
nix build: Add '--profile' flag
This replaces 'nix-env --set'. For example:

  $ nix build --profile /nix/var/nix/profiles/system \
      ~/Misc/eelco-configurations:nixosConfigurations.vyr.config.system.build.toplevel

updates the NixOS system profile from a flake.

This could have been a separate command (e.g. 'nix set-profile') but
1) '--profile' is pretty similar to '--out-link'; and 2) '--profile'
could be useful for other command (like 'nix dev-shell').
2019-07-12 15:32:17 +02:00

76 lines
2.2 KiB
C++

#include "eval.hh"
#include "command.hh"
#include "common-args.hh"
#include "shared.hh"
#include "store-api.hh"
using namespace nix;
struct CmdBuild : MixDryRun, MixProfile, InstallablesCommand
{
Path outLink = "result";
CmdBuild()
{
mkFlag()
.longName("out-link")
.shortName('o')
.description("path of the symlink to the build result")
.labels({"path"})
.dest(&outLink);
mkFlag()
.longName("no-link")
.description("do not create a symlink to the build result")
.set(&outLink, Path(""));
}
std::string description() override
{
return "build a derivation or fetch a store path";
}
Examples examples() override
{
return {
Example{
"To build and run GNU Hello from NixOS 17.03:",
"nix build -f channel:nixos-17.03 hello; ./result/bin/hello"
},
Example{
"To build the build.x86_64-linux attribute from release.nix:",
"nix build -f release.nix build.x86_64-linux"
},
Example{
"To make a profile point at GNU Hello:",
"nix build --profile /tmp/profile nixpkgs:hello"
},
};
}
void run(ref<Store> store) override
{
auto buildables = build(store, dryRun ? DryRun : Build, installables);
auto evalState = std::make_shared<EvalState>(searchPath, store);
evalState->addRegistryOverrides(registryOverrides);
if (dryRun) return;
if (outLink != "") {
for (size_t i = 0; i < buildables.size(); ++i) {
for (auto & output : buildables[i].outputs)
if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>()) {
std::string symlink = outLink;
if (i) symlink += fmt("-%d", i);
if (output.first != "out") symlink += fmt("-%s", output.first);
store2->addPermRoot(output.second, absPath(symlink), true);
}
}
}
updateProfile(buildables);
}
};
static auto r1 = registerCommand<CmdBuild>("build");