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author | Vincent Ambo <tazjin@google.com> | 2020-05-17T14·52+0100 |
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committer | Vincent Ambo <tazjin@google.com> | 2020-05-17T14·52+0100 |
commit | 7994fd1d545cc5c876d6f21db7ddf9185d23dad6 (patch) | |
tree | 32dd695785378c5b9c8be97fc583e9dfc62cb105 /third_party/nix/src/nix/cat.cc | |
parent | cf8cd640c1adf74a3706efbcb0ea4625da106fb2 (diff) | |
parent | 90b3b31dc27f31e9b11653a636025d29ddb087a3 (diff) |
Add 'third_party/nix/' from commit 'be66c7a6b24e3c3c6157fd37b86c7203d14acf10' r/724
git-subtree-dir: third_party/nix git-subtree-mainline: cf8cd640c1adf74a3706efbcb0ea4625da106fb2 git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10
Diffstat (limited to 'third_party/nix/src/nix/cat.cc')
-rw-r--r-- | third_party/nix/src/nix/cat.cc | 74 |
1 files changed, 74 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..a35f640d8840 --- /dev/null +++ b/third_party/nix/src/nix/cat.cc @@ -0,0 +1,74 @@ +#include "command.hh" +#include "store-api.hh" +#include "fs-accessor.hh" +#include "nar-accessor.hh" + +using namespace nix; + +struct MixCat : virtual Args +{ + std::string path; + + void cat(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 : 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 : 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)))); + } +}; + +static RegisterCommand r1(make_ref<CmdCatStore>()); +static RegisterCommand r2(make_ref<CmdCatNar>()); |