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#include "command.hh"
#include "common-args.hh"
#include "store-api.hh"
#include "filetransfer.hh"
#include "eval.hh"
#include "attr-path.hh"
#include "names.hh"
#include "progress-bar.hh"
using namespace nix;
struct CmdUpgradeNix : MixDryRun, StoreCommand
{
Path profileDir;
std::string storePathsUrl = "https://github.com/NixOS/nixpkgs/raw/master/nixos/modules/installer/tools/nix-fallback-paths.nix";
CmdUpgradeNix()
{
addFlag({
.longName = "profile",
.shortName = 'p',
.description = "The path to the Nix profile to upgrade.",
.labels = {"profile-dir"},
.handler = {&profileDir}
});
addFlag({
.longName = "nix-store-paths-url",
.description = "The URL of the file that contains the store paths of the latest Nix release.",
.labels = {"url"},
.handler = {&storePathsUrl}
});
}
/**
* This command is stable before the others
*/
std::optional<ExperimentalFeature> experimentalFeature() override
{
return std::nullopt;
}
std::string description() override
{
return "upgrade Nix to the stable version declared in Nixpkgs";
}
std::string doc() override
{
return
#include "upgrade-nix.md"
;
}
Category category() override { return catNixInstallation; }
void run(ref<Store> store) override
{
evalSettings.pureEval = true;
if (profileDir == "")
profileDir = getProfileDir(store);
printInfo("upgrading Nix in profile '%s'", profileDir);
auto storePath = getLatestNix(store);
auto version = DrvName(storePath.name()).version;
if (dryRun) {
stopProgressBar();
warn("would upgrade to version %s", version);
return;
}
{
Activity act(*logger, lvlInfo, actUnknown, fmt("downloading '%s'...", store->printStorePath(storePath)));
store->ensurePath(storePath);
}
{
Activity act(*logger, lvlInfo, actUnknown, fmt("verifying that '%s' works...", store->printStorePath(storePath)));
auto program = store->printStorePath(storePath) + "/bin/nix-env";
auto s = runProgram(program, false, {"--version"});
if (s.find("Nix") == std::string::npos)
throw Error("could not verify that '%s' works", program);
}
stopProgressBar();
{
Activity act(*logger, lvlInfo, actUnknown,
fmt("installing '%s' into profile '%s'...", store->printStorePath(storePath), profileDir));
runProgram(settings.nixBinDir + "/nix-env", false,
{"--profile", profileDir, "-i", store->printStorePath(storePath), "--no-sandbox"});
}
printInfo(ANSI_GREEN "upgrade to version %s done" ANSI_NORMAL, version);
}
/* Return the profile in which Nix is installed. */
Path getProfileDir(ref<Store> store)
{
Path where;
for (auto & dir : tokenizeString<Strings>(getEnv("PATH").value_or(""), ":"))
if (pathExists(dir + "/nix-env")) {
where = dir;
break;
}
if (where == "")
throw Error("couldn't figure out how Nix is installed, so I can't upgrade it");
printInfo("found Nix in '%s'", where);
if (hasPrefix(where, "/run/current-system"))
throw Error("Nix on NixOS must be upgraded via 'nixos-rebuild'");
Path profileDir = dirOf(where);
// Resolve profile to /nix/var/nix/profiles/<name> link.
while (canonPath(profileDir).find("/profiles/") == std::string::npos && isLink(profileDir))
profileDir = readLink(profileDir);
printInfo("found profile '%s'", profileDir);
Path userEnv = canonPath(profileDir, true);
if (baseNameOf(where) != "bin" ||
!hasSuffix(userEnv, "user-environment"))
throw Error("directory '%s' does not appear to be part of a Nix profile", where);
if (!store->isValidPath(store->parseStorePath(userEnv)))
throw Error("directory '%s' is not in the Nix store", userEnv);
return profileDir;
}
/* Return the store path of the latest stable Nix. */
StorePath getLatestNix(ref<Store> store)
{
Activity act(*logger, lvlInfo, actUnknown, "querying latest Nix version");
// FIXME: use nixos.org?
auto req = FileTransferRequest(storePathsUrl);
auto res = getFileTransfer()->download(req);
auto state = std::make_unique<EvalState>(Strings(), store);
auto v = state->allocValue();
state->eval(state->parseExprFromString(res.data, state->rootPath(CanonPath("/no-such-path"))), *v);
Bindings & bindings(*state->allocBindings(0));
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v).first;
return store->parseStorePath(state->forceString(*v2, noPos, "while evaluating the path tho latest nix version"));
}
};
static auto rCmdUpgradeNix = registerCommand<CmdUpgradeNix>("upgrade-nix");
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