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Diffstat (limited to 'third_party/nix/src/nix/path-info.cc')
-rw-r--r-- | third_party/nix/src/nix/path-info.cc | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/third_party/nix/src/nix/path-info.cc b/third_party/nix/src/nix/path-info.cc new file mode 100644 index 000000000000..fcf060d50d08 --- /dev/null +++ b/third_party/nix/src/nix/path-info.cc @@ -0,0 +1,133 @@ +#include <algorithm> +#include <array> + +#include "libmain/common-args.hh" +#include "libmain/shared.hh" +#include "libstore/store-api.hh" +#include "libutil/json.hh" +#include "nix/command.hh" + +namespace nix { +struct CmdPathInfo final : StorePathsCommand, MixJSON { + bool showSize = false; + bool showClosureSize = false; + bool humanReadable = false; + bool showSigs = false; + + CmdPathInfo() { + mkFlag('s', "size", "print size of the NAR dump of each path", &showSize); + mkFlag('S', "closure-size", + "print sum size of the NAR dumps of the closure of each path", + &showClosureSize); + mkFlag('h', "human-readable", + "with -s and -S, print sizes like 1K 234M 5.67G etc.", + &humanReadable); + mkFlag(0, "sigs", "show signatures", &showSigs); + } + + std::string name() override { return "path-info"; } + + std::string description() override { + return "query information about store paths"; + } + + Examples examples() override { + return { + Example{"To show the closure sizes of every path in the current NixOS " + "system closure, sorted by size:", + "nix path-info -rS /run/current-system | sort -nk2"}, + Example{"To show a package's closure size and all its dependencies " + "with human readable sizes:", + "nix path-info -rsSh nixpkgs.rust"}, + Example{"To check the existence of a path in a binary cache:", + "nix path-info -r /nix/store/7qvk5c91...-geeqie-1.1 --store " + "https://cache.nixos.org/"}, + Example{"To print the 10 most recently added paths (using --json and " + "the jq(1) command):", + "nix path-info --json --all | jq -r " + "'sort_by(.registrationTime)[-11:-1][].path'"}, + Example{"To show the size of the entire Nix store:", + "nix path-info --json --all | jq 'map(.narSize) | add'"}, + Example{"To show every path whose closure is bigger than 1 GB, sorted " + "by closure size:", + "nix path-info --json --all -S | jq 'map(select(.closureSize > " + "1e9)) | sort_by(.closureSize) | map([.path, .closureSize])'"}, + }; + } + + void printSize(unsigned long long value) { + if (!humanReadable) { + std::cout << fmt("\t%11d", value); + return; + } + + static const std::array<char, 9> idents{ + {' ', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'}}; + size_t power = 0; + double res = value; + while (res > 1024 && power < idents.size()) { + ++power; + res /= 1024; + } + std::cout << fmt("\t%6.1f%c", res, idents.at(power)); + } + + void run(ref<Store> store, Paths storePaths) override { + size_t pathLen = 0; + for (auto& storePath : storePaths) { + pathLen = std::max(pathLen, storePath.size()); + } + + if (json) { + JSONPlaceholder jsonRoot(std::cout); + store->pathInfoToJSON(jsonRoot, + // FIXME: preserve order? + PathSet(storePaths.begin(), storePaths.end()), true, + showClosureSize, AllowInvalid); + } + + else { + for (auto storePath : storePaths) { + auto info = store->queryPathInfo(storePath); + storePath = info->path; // FIXME: screws up padding + + std::cout << storePath; + + if (showSize || showClosureSize || showSigs) { + std::cout << std::string( + std::max(0, static_cast<int>(pathLen) - + static_cast<int>(storePath.size())), + ' '); + } + + if (showSize) { + printSize(info->narSize); + } + + if (showClosureSize) { + printSize(store->getClosureSize(storePath).first); + } + + if (showSigs) { + std::cout << '\t'; + Strings ss; + if (info->ultimate) { + ss.push_back("ultimate"); + } + if (!info->ca.empty()) { + ss.push_back("ca:" + info->ca); + } + for (auto& sig : info->sigs) { + ss.push_back(sig); + } + std::cout << concatStringsSep(" ", ss); + } + + std::cout << std::endl; + } + } + } +}; +} // namespace nix + +static nix::RegisterCommand r1(nix::make_ref<nix::CmdPathInfo>()); |