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WIP: Make Hash always store a valid hash type

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This commit is contained in:
John Ericson 2020-06-19 18:41:33 +00:00
parent 984e521392
commit 20799a5151
8 changed files with 53 additions and 52 deletions
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2
src/libstore/build.cc
View file

@ -4997,7 +4997,7 @@ bool Worker::pathContentsGood(const StorePath & path)
if (!pathExists(store.printStorePath(path)))
res = false;
else {
HashResult current = hashPath(*info->narHash.type, store.printStorePath(path));
HashResult current = hashPath(info->narHash->type, store.printStorePath(path));
Hash nullHash(htSHA256);
res = info->narHash == nullHash || info->narHash == current.first;
}

3
src/libstore/store-api.hh
View file

@ -116,7 +116,8 @@ struct ValidPathInfo
{
StorePath path;
std::optional<StorePath> deriver;
Hash narHash;
// TODO document this
std::optional<Hash> narHash;
StorePathSet references;
time_t registrationTime = 0;
uint64_t narSize = 0; // 0 = unknown

65
src/libutil/hash.cc
View file

@ -16,16 +16,19 @@
namespace nix {
static size_t regularHashSize(HashType type) {
switch (type) {
case htMD5: return md5HashSize;
case htSHA1: return sha1HashSize;
case htSHA256: return sha256HashSize;
case htSHA512: return sha512HashSize;
}
abort();
}
void Hash::init()
{
if (!type) abort();
switch (*type) {
case htMD5: hashSize = md5HashSize; break;
case htSHA1: hashSize = sha1HashSize; break;
case htSHA256: hashSize = sha256HashSize; break;
case htSHA512: hashSize = sha512HashSize; break;
}
hashSize = regularHashSize(type);
assert(hashSize <= maxHashSize);
memset(hash, 0, maxHashSize);
}
@ -105,18 +108,11 @@ string printHash16or32(const Hash & hash)
}
HashType assertInitHashType(const Hash & h) {
if (h.type)
return *h.type;
else
abort();
}
std::string Hash::to_string(Base base, bool includeType) const
{
std::string s;
if (base == SRI || includeType) {
s += printHashType(assertInitHashType(*this));
s += printHashType(type);
s += base == SRI ? '-' : ':';
}
switch (base) {
@ -137,29 +133,36 @@ std::string Hash::to_string(Base base, bool includeType) const
Hash::Hash(std::string_view s, HashType type) : Hash(s, std::optional { type }) { }
Hash::Hash(std::string_view s) : Hash(s, std::optional<HashType>{}) { }
Hash::Hash(std::string_view s, std::optional<HashType> type)
: type(type)
Hash::Hash(std::string_view s, std::optional<HashType> optType)
{
size_t pos = 0;
bool isSRI = false;
// Find the : or - separater, and set `isSRI` to the correct value
auto sep = s.find(':');
if (sep == string::npos) {
sep = s.find('-');
if (sep != string::npos) {
if (sep != string::npos)
isSRI = true;
} else if (! type)
throw BadHash("hash '%s' does not include a type", s);
}
// Parse the has type before the separater, if there was one.
std::optional<HashType> optParsedType;
if (sep != string::npos) {
string hts = string(s, 0, sep);
this->type = parseHashType(hts);
if (!this->type)
auto hts = s.substr(0, sep);
auto optParsedType = parseHashType(hts);
if (!optParsedType)
throw BadHash("unknown hash type '%s'", hts);
if (type && type != this->type)
throw BadHash("hash '%s' should have type '%s'", s, printHashType(*type));
pos = sep + 1;
}
// Either the string or user must provide the type, if they both do they
// must agree.
if (!optParsedType && !optType) {
throw BadHash("hash '%s' does not include a type, nor is the type otherwise known from context.", s);
} else {
this->type = optParsedType ? *optParsedType : *optType;
if (optParsedType && optType && *optParsedType != *optType)
throw BadHash("hash '%s' should have type '%s'", s, printHashType(*optType));
}
init();
@ -214,7 +217,7 @@ Hash::Hash(std::string_view s, std::optional<HashType> type)
}
else
throw BadHash("hash '%s' has wrong length for hash type '%s'", s, printHashType(*type));
throw BadHash("hash '%s' has wrong length for hash type '%s'", s, printHashType(type));
}
Hash newHashAllowEmpty(std::string hashStr, std::optional<HashType> ht)
@ -267,7 +270,7 @@ static void finish(HashType ht, Ctx & ctx, unsigned char * hash)
}
Hash hashString(HashType ht, const string & s)
Hash hashString(HashType ht, std::string_view s)
{
Ctx ctx;
Hash hash(ht);
@ -334,7 +337,7 @@ HashResult hashPath(
Hash compressHash(const Hash & hash, unsigned int newSize)
{
Hash h;
Hash h(hash.type);
h.hashSize = newSize;
for (unsigned int i = 0; i < hash.hashSize; ++i)
h.hash[i % newSize] ^= hash.hash[i];
@ -342,7 +345,7 @@ Hash compressHash(const Hash & hash, unsigned int newSize)
}
std::optional<HashType> parseHashTypeOpt(const string & s)
std::optional<HashType> parseHashTypeOpt(std::string_view s)
{
if (s == "md5") return htMD5;
else if (s == "sha1") return htSHA1;
@ -351,7 +354,7 @@ std::optional<HashType> parseHashTypeOpt(const string & s)
else return std::optional<HashType> {};
}
HashType parseHashType(const string & s)
HashType parseHashType(std::string_view s)
{
auto opt_h = parseHashTypeOpt(s);
if (opt_h)

17
src/libutil/hash.hh
View file

@ -25,14 +25,11 @@ enum Base : int { Base64, Base32, Base16, SRI };
struct Hash
{
static const unsigned int maxHashSize = 64;
unsigned int hashSize = 0;
unsigned char hash[maxHashSize] = {};
constexpr static size_t maxHashSize = 64;
size_t hashSize = 0;
uint8_t hash[maxHashSize] = {};
std::optional<HashType> type = {};
/* Create an unset hash object. */
Hash() { };
HashType type;
/* Create a zero-filled hash object. */
Hash(HashType type) : type(type) { init(); };
@ -105,7 +102,7 @@ Hash newHashAllowEmpty(std::string hashStr, std::optional<HashType> ht);
string printHash16or32(const Hash & hash);
/* Compute the hash of the given string. */
Hash hashString(HashType ht, const string & s);
Hash hashString(HashType ht, std::string_view s);
/* Compute the hash of the given file. */
Hash hashFile(HashType ht, const Path & path);
@ -121,9 +118,9 @@ HashResult hashPath(HashType ht, const Path & path,
Hash compressHash(const Hash & hash, unsigned int newSize);
/* Parse a string representing a hash type. */
HashType parseHashType(const string & s);
HashType parseHashType(std::string_view s);
/* Will return nothing on parse error */
std::optional<HashType> parseHashTypeOpt(const string & s);
std::optional<HashType> parseHashTypeOpt(std::string_view s);
/* And the reverse. */
string printHashType(HashType ht);

2
src/nix-prefetch-url/nix-prefetch-url.cc
View file

@ -153,7 +153,7 @@ static int _main(int argc, char * * argv)
/* If an expected hash is given, the file may already exist in
the store. */
Hash hash, expectedHash(ht);
Hash hash(ht), expectedHash(ht);
std::optional<StorePath> storePath;
if (args.size() == 2) {
expectedHash = Hash(args[1], ht);

10
src/nix-store/nix-store.cc
View file

@ -372,8 +372,8 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (auto & j : maybeUseOutputs(store->followLinksToStorePath(i), useOutput, forceRealise)) {
auto info = store->queryPathInfo(j);
if (query == qHash) {
assert(info->narHash.type == htSHA256);
cout << fmt("%s\n", info->narHash.to_string(Base32, true));
assert(info->narHash && info->narHash->type == htSHA256);
cout << fmt("%s\n", info->narHash->to_string(Base32, true));
} else if (query == qSize)
cout << fmt("%d\n", info->narSize);
}
@ -725,7 +725,7 @@ static void opVerifyPath(Strings opFlags, Strings opArgs)
auto path = store->followLinksToStorePath(i);
printMsg(lvlTalkative, "checking path '%s'...", store->printStorePath(path));
auto info = store->queryPathInfo(path);
HashSink sink(*info->narHash.type);
HashSink sink(info->narHash->type);
store->narFromPath(path, sink);
auto current = sink.finish();
if (current.first != info->narHash) {
@ -734,7 +734,7 @@ static void opVerifyPath(Strings opFlags, Strings opArgs)
.hint = hintfmt(
"path '%s' was modified! expected hash '%s', got '%s'",
store->printStorePath(path),
info->narHash.to_string(Base32, true),
info->narHash->to_string(Base32, true),
current.first.to_string(Base32, true))
});
status = 1;
@ -864,7 +864,7 @@ static void opServe(Strings opFlags, Strings opArgs)
out << info->narSize // downloadSize
<< info->narSize;
if (GET_PROTOCOL_MINOR(clientVersion) >= 4)
out << (info->narHash ? info->narHash.to_string(Base32, true) : "") << info->ca << info->sigs;
out << (info->narHash ? info->narHash->to_string(Base32, true) : "") << info->ca << info->sigs;
} catch (InvalidPath &) {
}
}

4
src/nix/add-to-store.cc
View file

@ -46,9 +46,9 @@ struct CmdAddToStore : MixDryRun, StoreCommand
auto narHash = hashString(htSHA256, *sink.s);
ValidPathInfo info(store->makeFixedOutputPath(FileIngestionMethod::Recursive, narHash, *namePart));
info.narHash = narHash;
*info.narHash = narHash;
info.narSize = sink.s->size();
info.ca = makeFixedOutputCA(FileIngestionMethod::Recursive, info.narHash);
info.ca = makeFixedOutputCA(FileIngestionMethod::Recursive, *info.narHash);
if (!dryRun) {
auto source = StringSource { *sink.s };

2
src/nix/develop.cc
View file

@ -139,7 +139,7 @@ StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
.path = shellOutPath,
.hash = DerivationOutputHash {
.method = FileIngestionMethod::Flat,
.hash = Hash { },
.hash = Hash { htSHA256 },
},
});
drv.env["out"] = store->printStorePath(shellOutPath);