diff options
Diffstat (limited to 'third_party/nix/src/nix/cat.cc')
-rw-r--r-- | third_party/nix/src/nix/cat.cc | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/third_party/nix/src/nix/cat.cc b/third_party/nix/src/nix/cat.cc new file mode 100644 index 000000000000..7788707eae56 --- /dev/null +++ b/third_party/nix/src/nix/cat.cc @@ -0,0 +1,56 @@ +#include "libstore/fs-accessor.hh" +#include "libstore/nar-accessor.hh" +#include "libstore/store-api.hh" +#include "nix/command.hh" + +namespace nix { +struct MixCat : virtual Args { + std::string path; + + void cat(const ref<FSAccessor>& accessor) { + auto st = accessor->stat(path); + if (st.type == FSAccessor::Type::tMissing) { + throw Error(format("path '%1%' does not exist") % path); + } + if (st.type != FSAccessor::Type::tRegular) { + throw Error(format("path '%1%' is not a regular file") % path); + } + + std::cout << accessor->readFile(path); + } +}; + +struct CmdCatStore final : StoreCommand, MixCat { + CmdCatStore() { expectArg("path", &path); } + + std::string name() override { return "cat-store"; } + + std::string description() override { + return "print the contents of a store file on stdout"; + } + + void run(ref<Store> store) override { cat(store->getFSAccessor()); } +}; + +struct CmdCatNar final : StoreCommand, MixCat { + Path narPath; + + CmdCatNar() { + expectArg("nar", &narPath); + expectArg("path", &path); + } + + std::string name() override { return "cat-nar"; } + + std::string description() override { + return "print the contents of a file inside a NAR file"; + } + + void run(ref<Store> store) override { + cat(makeNarAccessor(make_ref<std::string>(readFile(narPath)))); + } +}; +} // namespace nix + +static nix::RegisterCommand r1(nix::make_ref<nix::CmdCatStore>()); +static nix::RegisterCommand r2(nix::make_ref<nix::CmdCatNar>()); |