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Support SRI hashes

Browse source 
SRI hashes (https://www.w3.org/TR/SRI/) combine the hash algorithm and
a base-64 hash. This allows more concise and standard hash
specifications. For example, instead of

  import <nix/fetchurl.nl> {
    url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
    sha256 = "5d22dad058d5c800d65a115f919da22938c50dd6ba98c5e3a183172d149840a4";
  };

you can write

  import <nix/fetchurl.nl> {
    url = https://nixos.org/releases/nix/nix-2.1.3/nix-2.1.3.tar.xz;
    hash = "sha256-XSLa0FjVyADWWhFfkZ2iKTjFDda6mMXjoYMXLRSYQKQ=";
  };

In fixed-output derivations, the outputHashAlgo is no longer mandatory
if outputHash specifies the hash (either as an SRI or in the old
"<type>:<hash>" format).

'nix hash-{file,path}' now print hashes in SRI format by default. I
also reverted them to use SHA-256 by default because that's what we're
using most of the time in Nixpkgs.

Suggested by @zimbatm.
This commit is contained in:
Eelco Dolstra 2018-12-13 14:30:52 +01:00
parent c37e6d77ea
commit 6024dc1d97
No known key found for this signature in database
GPG key ID: 8170B4726D7198DE
8 changed files with 72 additions and 34 deletions
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23
src/nix/hash.cc
View file

@ -9,13 +9,14 @@ struct CmdHash : Command
{
enum Mode { mFile, mPath };
Mode mode;
Base base = Base16;
Base base = SRI;
bool truncate = false;
HashType ht = htSHA512;
HashType ht = htSHA256;
std::vector<std::string> paths;
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);
@ -43,7 +44,7 @@ struct CmdHash : Command
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, false);
h.to_string(base, base == SRI);
}
}
};
@ -54,7 +55,7 @@ static RegisterCommand r2(make_ref<CmdHash>(CmdHash::mPath));
struct CmdToBase : Command
{
Base base;
HashType ht = htSHA512;
HashType ht = htUnknown;
std::vector<std::string> args;
CmdToBase(Base base) : base(base)
@ -70,26 +71,30 @@ struct CmdToBase : Command
return
base == Base16 ? "to-base16" :
base == Base32 ? "to-base32" :
"to-base64";
base == Base64 ? "to-base64" :
"to-sri";
}
std::string description() override
{
return fmt("convert a hash to base-%d representation",
base == Base16 ? 16 :
base == Base32 ? 32 : 64);
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 (auto s : args)
std::cout << fmt("%s\n", Hash(s, ht).to_string(base, false));
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)