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libutil: turn HashModuloSink into a free function

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Change-Id: I5878007502fa68c2816a0f4c61f7d0e60bdde702
This commit is contained in:
eldritch horrors 2024-05-01 20:10:00 +02:00
parent 4162a66cee
commit 5af76dee37
7 changed files with 44 additions and 62 deletions
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18
src/libstore/build/local-derivation-goal.cc
View file

@ -2216,23 +2216,21 @@ SingleDrvOutputs LocalDerivationGoal::registerOutputs()
rewriteOutput(outputRewrites);
/* FIXME optimize and deduplicate with addToStore */
std::string oldHashPart { scratchPath->hashPart() };
HashModuloSink caSink { outputHash.hashType, oldHashPart };
std::visit(overloaded {
[&](const TextIngestionMethod &) {
caSink << readFileSource(actualPath);
auto input = std::visit(overloaded {
[&](const TextIngestionMethod &) -> GeneratorSource {
return GeneratorSource(readFileSource(actualPath));
},
[&](const FileIngestionMethod & m2) {
[&](const FileIngestionMethod & m2) -> GeneratorSource {
switch (m2) {
case FileIngestionMethod::Recursive:
caSink << dumpPath(actualPath);
break;
return GeneratorSource(dumpPath(actualPath));
case FileIngestionMethod::Flat:
caSink << readFileSource(actualPath);
break;
return GeneratorSource(readFileSource(actualPath));
}
assert(false);
},
}, outputHash.method.raw);
auto got = caSink.finish().first;
auto got = computeHashModulo(outputHash.hashType, oldHashPart, input).first;
auto optCA = ContentAddressWithReferences::fromPartsOpt(
outputHash.method,

18
src/libstore/local-store.cc
View file

@ -1887,25 +1887,23 @@ ContentAddress LocalStore::hashCAPath(
const std::string_view pathHash
)
{
HashModuloSink caSink ( hashType, std::string(pathHash) );
std::visit(overloaded {
[&](const TextIngestionMethod &) {
caSink << readFileSource(path);
auto data = std::visit(overloaded {
[&](const TextIngestionMethod &) -> GeneratorSource {
return GeneratorSource(readFileSource(path));
},
[&](const FileIngestionMethod & m2) {
[&](const FileIngestionMethod & m2) -> GeneratorSource {
switch (m2) {
case FileIngestionMethod::Recursive:
caSink << dumpPath(path);
break;
return GeneratorSource(dumpPath(path));
case FileIngestionMethod::Flat:
caSink << readFileSource(path);
break;
return GeneratorSource(readFileSource(path));
}
assert(false);
},
}, method.raw);
return ContentAddress {
.method = method,
.hash = caSink.finish().first,
.hash = computeHashModulo(hashType, std::string(pathHash), data).first,
};
}

8
src/libstore/make-content-addressed.cc
View file

@ -43,10 +43,10 @@ std::map<StorePath, StorePath> makeContentAddressed(
sink.s = rewriteStrings(sink.s, rewrites);
HashModuloSink hashModuloSink(htSHA256, oldHashPart);
hashModuloSink(sink.s);
auto narModuloHash = hashModuloSink.finish().first;
auto narModuloHash = [&] {
StringSource source{sink.s};
return computeHashModulo(htSHA256, oldHashPart, source).first;
}();
ValidPathInfo info {
dstStore,

7
src/libutil/hash.hh
View file

@ -203,5 +203,12 @@ public:
HashResult currentHash();
};
inline HashResult hashSource(HashType ht, Source & source)
{
HashSink h(ht);
source.drainInto(h);
return h.finish();
}
}

15
src/libutil/references.cc
View file

@ -109,19 +109,12 @@ void RewritingSink::flush()
prev.clear();
}
HashModuloSink::HashModuloSink(HashType ht, const std::string & modulus)
: hashSink(ht)
, rewritingSink(modulus, std::string(modulus.size(), 0), hashSink)
HashResult computeHashModulo(HashType ht, const std::string & modulus, Source & source)
{
}
HashSink hashSink(ht);
RewritingSink rewritingSink(modulus, std::string(modulus.size(), 0), hashSink);
void HashModuloSink::operator () (std::string_view data)
{
rewritingSink(data);
}
HashResult HashModuloSink::finish()
{
source.drainInto(rewritingSink);
rewritingSink.flush();
/* Hash the positions of the self-references. This ensures that a

12
src/libutil/references.hh
View file

@ -41,16 +41,6 @@ struct RewritingSink : Sink
void flush();
};
struct HashModuloSink : AbstractHashSink
{
HashSink hashSink;
RewritingSink rewritingSink;
HashModuloSink(HashType ht, const std::string & modulus);
void operator () (std::string_view data) override;
HashResult finish() override;
};
HashResult computeHashModulo(HashType ht, const std::string & modulus, Source & source);
}

28
src/nix/hash.cc
View file

@ -76,23 +76,19 @@ struct CmdHashBase : Command
void run() override
{
for (auto path : paths) {
auto source = [&] () -> GeneratorSource {
switch (mode) {
case FileIngestionMethod::Flat:
return GeneratorSource(readFileSource(path));
case FileIngestionMethod::Recursive:
return GeneratorSource(dumpPath(path));
}
assert(false);
}();
std::unique_ptr<AbstractHashSink> hashSink;
if (modulus)
hashSink = std::make_unique<HashModuloSink>(ht, *modulus);
else
hashSink = std::make_unique<HashSink>(ht);
switch (mode) {
case FileIngestionMethod::Flat:
*hashSink << readFileSource(path);
break;
case FileIngestionMethod::Recursive:
*hashSink << dumpPath(path);
break;
}
Hash h = hashSink->finish().first;
Hash h = modulus
? computeHashModulo(ht, *modulus, source).first
: hashSource(ht, source).first;
if (truncate && h.hashSize > 20) h = compressHash(h, 20);
logger->cout(h.to_string(base, base == SRI));
}