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#include "libutil/hash.hh"
#include "libmain/shared.hh"
#include "nix/command.hh"
#include "nix/legacy.hh"
using namespace nix;
struct CmdHash : Command {
enum Mode { mFile, mPath };
Mode mode;
Base base = SRI;
bool truncate = false;
HashType ht = htSHA256;
std::vector<std::string> paths;
explicit CmdHash(Mode mode) : mode(mode) {
mkFlag(0, "sri", "print hash in SRI format", &base, SRI);
mkFlag(0, "base64", "print hash in base-64", &base, Base64);
mkFlag(0, "base32", "print hash in base-32 (Nix-specific)", &base, Base32);
mkFlag(0, "base16", "print hash in base-16", &base, Base16);
mkFlag().longName("type").mkHashTypeFlag(&ht);
expectArgs("paths", &paths);
}
std::string name() override {
return mode == mFile ? "hash-file" : "hash-path";
}
std::string description() override {
return mode == mFile
? "print cryptographic hash of a regular file"
: "print cryptographic hash of the NAR serialisation of a path";
}
void run() override {
for (const auto& path : paths) {
Hash h = mode == mFile ? hashFile(ht, path) : hashPath(ht, path).first;
if (truncate && h.hashSize > 20) {
h = compressHash(h, 20);
}
std::cout << format("%1%\n") % h.to_string(base, base == SRI);
}
}
};
static RegisterCommand r1(make_ref<CmdHash>(CmdHash::mFile));
static RegisterCommand r2(make_ref<CmdHash>(CmdHash::mPath));
struct CmdToBase : Command {
Base base;
HashType ht = htUnknown;
std::vector<std::string> args;
explicit CmdToBase(Base base) : base(base) {
mkFlag().longName("type").mkHashTypeFlag(&ht);
expectArgs("strings", &args);
}
std::string name() override {
return base == Base16
? "to-base16"
: base == Base32 ? "to-base32"
: base == Base64 ? "to-base64" : "to-sri";
}
std::string description() override {
return fmt(
"convert a hash to %s representation",
base == Base16
? "base-16"
: base == Base32 ? "base-32" : base == Base64 ? "base-64" : "SRI");
}
void run() override {
for (const auto& s : args) {
std::cout << fmt("%s\n", Hash(s, ht).to_string(base, base == SRI));
}
}
};
static RegisterCommand r3(make_ref<CmdToBase>(Base16));
static RegisterCommand r4(make_ref<CmdToBase>(Base32));
static RegisterCommand r5(make_ref<CmdToBase>(Base64));
static RegisterCommand r6(make_ref<CmdToBase>(SRI));
/* Legacy nix-hash command. */
static int compatNixHash(int argc, char** argv) {
HashType ht = htMD5;
bool flat = false;
bool base32 = false;
bool truncate = false;
enum { opHash, opTo32, opTo16 } op = opHash;
std::vector<std::string> ss;
parseCmdLine(argc, argv,
[&](Strings::iterator& arg, const Strings::iterator& end) {
if (*arg == "--help") {
showManPage("nix-hash");
} else if (*arg == "--version") {
printVersion("nix-hash");
} else if (*arg == "--flat") {
flat = true;
} else if (*arg == "--base32") {
base32 = true;
} else if (*arg == "--truncate") {
truncate = true;
} else if (*arg == "--type") {
std::string s = getArg(*arg, arg, end);
ht = parseHashType(s);
if (ht == htUnknown) {
throw UsageError(format("unknown hash type '%1%'") % s);
}
} else if (*arg == "--to-base16") {
op = opTo16;
} else if (*arg == "--to-base32") {
op = opTo32;
} else if (*arg != "" && arg->at(0) == '-') {
return false;
} else {
ss.push_back(*arg);
}
return true;
});
if (op == opHash) {
CmdHash cmd(flat ? CmdHash::mFile : CmdHash::mPath);
cmd.ht = ht;
cmd.base = base32 ? Base32 : Base16;
cmd.truncate = truncate;
cmd.paths = ss;
cmd.run();
}
else {
CmdToBase cmd(op == opTo32 ? Base32 : Base16);
cmd.args = ss;
cmd.ht = ht;
cmd.run();
}
return 0;
}
static RegisterLegacyCommand s1("nix-hash", compatNixHash);
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