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#include <absl/strings/match.h>
#include <absl/strings/str_cat.h>
#include <absl/strings/str_split.h>
#include <glog/logging.h>
#include "libexpr/attr-path.hh"
#include "libexpr/eval.hh"
#include "libexpr/names.hh"
#include "libmain/common-args.hh"
#include "libstore/download.hh"
#include "libstore/store-api.hh"
#include "nix/command.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() {
mkFlag()
.longName("profile")
.shortName('p')
.labels({"profile-dir"})
.description("the Nix profile to upgrade")
.dest(&profileDir);
mkFlag()
.longName("nix-store-paths-url")
.labels({"url"})
.description(
"URL of the file that contains the store paths of the latest Nix "
"release")
.dest(&storePathsUrl);
}
std::string name() override { return "upgrade-nix"; }
std::string description() override {
return "upgrade Nix to the latest stable version";
}
Examples examples() override {
return {
Example{"To upgrade Nix to the latest stable version:",
"nix upgrade-nix"},
Example{
"To upgrade Nix in a specific profile:",
"nix upgrade-nix -p /nix/var/nix/profiles/per-user/alice/profile"},
};
}
void run(ref<Store> store) override {
evalSettings.pureEval = true;
if (profileDir.empty()) {
profileDir = getProfileDir(store);
}
LOG(INFO) << "upgrading Nix in profile '" << profileDir << "'";
Path storePath;
{
LOG(INFO) << "querying latest Nix version";
storePath = getLatestNix(store);
}
auto version = DrvName(storePathToName(storePath)).version;
if (dryRun) {
LOG(ERROR) << "would upgrade to version " << version;
return;
}
{
LOG(INFO) << "downloading '" << storePath << "'...";
store->ensurePath(storePath);
}
{
LOG(INFO) << "verifying that '" << storePath << "' works...";
auto program = 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);
}
}
{
LOG(INFO) << "installing '" << storePath << "' into profile '"
<< profileDir << "'...";
runProgram(settings.nixBinDir + "/nix-env", false,
{"--profile", profileDir, "-i", storePath, "--no-sandbox"});
}
LOG(INFO) << ANSI_GREEN << "upgrade to version " << version << " done"
<< ANSI_NORMAL;
}
/* Return the profile in which Nix is installed. */
static Path getProfileDir(const ref<Store>& store) {
Path where;
for (auto& dir : absl::StrSplit(getEnv("PATH"), absl::ByChar(':'))) {
if (pathExists(absl::StrCat(dir, "/nix-env"))) {
where = dir;
break;
}
}
if (where.empty()) {
throw Error(
"couldn't figure out how Nix is installed, so I can't upgrade it");
}
LOG(INFO) << "found Nix in '" << where << "'";
if (absl::StartsWith(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);
}
LOG(INFO) << "found profile '" << profileDir << "'";
Path userEnv = canonPath(profileDir, true);
if (baseNameOf(where) != "bin" ||
!absl::EndsWith(userEnv, "user-environment")) {
throw Error("directory '%s' does not appear to be part of a Nix profile",
where);
}
if (!store->isValidPath(userEnv)) {
throw Error("directory '%s' is not in the Nix store", userEnv);
}
return profileDir;
}
/* Return the store path of the latest stable Nix. */
Path getLatestNix(const ref<Store>& store) {
// FIXME: use nixos.org?
auto req = DownloadRequest(storePathsUrl);
auto res = getDownloader()->download(req);
auto state = std::make_unique<EvalState>(Strings(), store);
auto v = state->allocValue();
state->eval(state->parseExprFromString(*res.data, "/no-such-path"), *v);
Bindings& bindings(*Bindings::NewGC());
auto v2 = findAlongAttrPath(*state, settings.thisSystem, bindings, *v);
return state->forceString(*v2);
}
};
static RegisterCommand r1(make_ref<CmdUpgradeNix>());
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