Add command "nix why-depends"
This command shows why a package has another package in its runtime closure. For example, to see why VLC has libdrm.dev in its closure: $ nix why-depends nixpkgs.vlc nixpkgs.libdrm.dev /nix/store/g901z9pcj0n5yy5n6ykxk3qm4ina1d6z-vlc-2.2.5.1: lib/libvlccore.so.8.0.0: …nfig:/nix/store/405lmx6jl8lp0ad1vrr6j498chrqhz8g-libdrm-2.4.75-d… /nix/store/s3nm7kd8hlcg0facn2q1ff2n7wrwdi2l-mesa-noglu-17.0.7-dev: nix-support/propagated-native-build-inputs: …-dev /nix/store/405lmx6jl8lp0ad1vrr6j498chrqhz8g-libdrm-2.4.75-d… Thus, VLC's lib/libvlccore.so.8.0.0 as well as mesa-noglu's nix-support/propagated-native-build-inputs cause the dependency.
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src/nix/why-depends.cc
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src/nix/why-depends.cc
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#include "command.hh"
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#include "common-args.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "progress-bar.hh"
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#include "fs-accessor.hh"
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using namespace nix;
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static std::string hilite(const std::string & s, size_t pos, size_t len)
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{
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return
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std::string(s, 0, pos)
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+ ANSI_RED
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+ std::string(s, pos, len)
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+ ANSI_NORMAL
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+ std::string(s, pos + len);
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}
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struct CmdWhyDepends : SourceExprCommand
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{
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std::string _package, _dependency;
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CmdWhyDepends()
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{
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expectArg("package", &_package);
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expectArg("dependency", &_dependency);
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}
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std::string name() override
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{
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return "why-depends";
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}
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std::string description() override
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{
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return "show why a package has another package in its closure";
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}
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Examples examples() override
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{
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return {
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Example{
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"To show which files in Hello's closure depend on Glibc:",
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"nix why-depends nixpkgs.hello nixpkgs.glibc"
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},
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};
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}
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void run(ref<Store> store) override
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{
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auto package = parseInstallable(*this, store, _package, false);
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auto packagePath = toStorePath(store, Build, package);
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auto dependency = parseInstallable(*this, store, _dependency, false);
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auto dependencyPath = toStorePath(store, NoBuild, dependency);
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auto dependencyPathHash = storePathToHash(dependencyPath);
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PathSet closure;
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store->computeFSClosure({packagePath}, closure, false, false);
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if (!closure.count(dependencyPath)) {
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printError("'%s' does not depend on '%s'", package->what(), dependency->what());
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return;
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}
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stopProgressBar(); // FIXME
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auto accessor = store->getFSAccessor();
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// FIXME: show the path through the dependency graph.
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bool first = true;
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for (auto & path : closure) {
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if (path == dependencyPath && packagePath != dependencyPath)
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continue;
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if (!store->queryPathInfo(path)->references.count(dependencyPath))
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continue;
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if (!first) std::cerr << "\n";
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first = false;
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std::cerr << fmt("%s:\n", path);
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std::function<void(const Path &)> recurse;
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recurse = [&](const Path & p) {
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auto st = accessor->stat(p);
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auto p2 = p == path ? "/" : std::string(p, path.size() + 1);
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if (st.type == FSAccessor::Type::tDirectory) {
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auto names = accessor->readDirectory(p);
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for (auto & name : names)
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recurse(p + "/" + name);
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}
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else if (st.type == FSAccessor::Type::tRegular) {
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auto contents = accessor->readFile(p);
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auto pos = contents.find(dependencyPathHash);
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if (pos != std::string::npos) {
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size_t margin = 16;
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auto pos2 = pos >= margin ? pos - margin : 0;
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std::string fragment;
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for (char c : std::string(contents, pos2,
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pos - pos2 + dependencyPathHash.size() + margin))
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{
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fragment += isprint(c) ? c : '.';
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}
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std::cerr << fmt(" %s: …%s…\n",
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p2,
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hilite(fragment, pos - pos2, storePathHashLen));
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}
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}
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else if (st.type == FSAccessor::Type::tSymlink) {
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auto target = accessor->readLink(p);
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auto pos = target.find(dependencyPathHash);
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if (pos != std::string::npos) {
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std::cerr << fmt(" %s -> %s\n", p2, hilite(target, pos, storePathHashLen));
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}
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}
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};
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recurse(path);
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}
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}
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};
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static RegisterCommand r1(make_ref<CmdWhyDepends>());
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