diff options
| -rw-r--r-- | doc/manual/release-notes/rl-1.12.xml | 5 | ||||
| -rw-r--r-- | src/nix/command.hh | 2 | ||||
| -rw-r--r-- | src/nix/main.cc | 5 | ||||
| -rw-r--r-- | src/nix/upgrade-nix.cc | 131 |
4 files changed, 142 insertions, 1 deletions
diff --git a/doc/manual/release-notes/rl-1.12.xml b/doc/manual/release-notes/rl-1.12.xml index 29943e3e6e97..89ec920949b6 100644 --- a/doc/manual/release-notes/rl-1.12.xml +++ b/doc/manual/release-notes/rl-1.12.xml @@ -79,6 +79,11 @@ <listitem><para><command>nix add-to-store</command> (970366266b8df712f5f9cedb45af183ef5a8357f).</para></listitem> + <listitem><para><command>nix upgrade-nix</command> upgrades Nix + to the latest stable version. This requires that Nix is + installed in a profile. (Thus it won’t work on NixOS, or if it’s + installed outside of the Nix store.)</para></listitem> + <listitem><para>Progress indicator.</para></listitem> <listitem><para>All options are available as flags now diff --git a/src/nix/command.hh b/src/nix/command.hh index 6b34e3881e79..a7863c49f37a 100644 --- a/src/nix/command.hh +++ b/src/nix/command.hh @@ -5,6 +5,8 @@ namespace nix { +extern std::string programPath; + struct Value; class Bindings; class EvalState; diff --git a/src/nix/main.cc b/src/nix/main.cc index 06bb8a1c3043..8f6bbe8f51ae 100644 --- a/src/nix/main.cc +++ b/src/nix/main.cc @@ -16,6 +16,8 @@ void chrootHelper(int argc, char * * argv); namespace nix { +std::string programPath; + struct NixArgs : virtual MultiCommand, virtual MixCommonArgs { NixArgs() : MultiCommand(*RegisterCommand::commands), MixCommonArgs("nix") @@ -78,7 +80,8 @@ void mainWrapped(int argc, char * * argv) initNix(); initGC(); - string programName = baseNameOf(argv[0]); + programPath = argv[0]; + string programName = baseNameOf(programPath); { auto legacy = (*RegisterLegacyCommand::commands)[programName]; diff --git a/src/nix/upgrade-nix.cc b/src/nix/upgrade-nix.cc new file mode 100644 index 000000000000..758bbbc688bc --- /dev/null +++ b/src/nix/upgrade-nix.cc @@ -0,0 +1,131 @@ +#include "command.hh" +#include "store-api.hh" +#include "download.hh" +#include "eval.hh" +#include "attr-path.hh" + +using namespace nix; + +struct CmdUpgradeNix : StoreCommand +{ + Path profileDir; + + CmdUpgradeNix() + { + mkFlag() + .longName("profile") + .shortName('p') + .labels({"profile-dir"}) + .description("the Nix profile to upgrade") + .dest(&profileDir); + } + + 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 + { + settings.pureEval = true; + + if (profileDir == "") + profileDir = getProfileDir(store); + + printInfo("upgrading Nix in profile '%s'", profileDir); + + Path storePath; + { + Activity act(*logger, lvlInfo, actUnknown, "querying latest Nix version"); + storePath = getLatestNix(store); + } + + { + Activity act(*logger, lvlInfo, actUnknown, fmt("downloading '%s'...", storePath)); + store->ensurePath(storePath); + } + + { + Activity act(*logger, lvlInfo, actUnknown, fmt("verifying that '%s' works...", storePath)); + 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); + } + + { + Activity act(*logger, lvlInfo, actUnknown, fmt("installing '%s' into profile '%s'...", storePath, profileDir)); + runProgram(settings.nixBinDir + "/nix-env", false, + {"--profile", profileDir, "-i", storePath, "--no-sandbox"}); + } + } + + /* Return the profile in which Nix is installed. */ + Path getProfileDir(ref<Store> store) + { + Path where; + + for (auto & dir : tokenizeString<Strings>(getEnv("PATH"), ":")) + 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; + Path userEnv; + + if (baseNameOf(where) != "bin" || + !hasSuffix(userEnv = canonPath(profileDir = dirOf(where), true), "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(ref<Store> store) + { + // FIXME: use nixos.org? + auto req = DownloadRequest("https://github.com/NixOS/nixpkgs/raw/master/nixos/modules/installer/tools/nix-fallback-paths.nix"); + auto res = getDownloader()->download(req); + + EvalState state(Strings(), store); + auto v = state.allocValue(); + state.eval(state.parseExprFromString(*res.data, "/no-such-path"), *v); + Bindings & bindings(*state.allocBindings(0)); + auto v2 = findAlongAttrPath(state, settings.thisSystem, bindings, *v); + + return state.forceString(*v2); + } +}; + +static RegisterCommand r1(make_ref<CmdUpgradeNix>()); |