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* Made addToStore() a lot more efficient: it no longer reads the path

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being copied 3 times in the worst case.  It doesn't run in constant space,
  but it didn't do that anyway.
This commit is contained in:
Eelco Dolstra 2008-12-03 15:51:17 +00:00
parent 64519cfd65
commit 1307b22223
2 changed files with 29 additions and 35 deletions
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4
src/libexpr/primops.cc
View file

@ -257,9 +257,7 @@ static Hash hashDerivationModulo(EvalState & state, Derivation drv)
/* For other derivations, replace the inputs paths with recursive
calls to this function.*/
DerivationInputs inputs2;
for (DerivationInputs::iterator i = drv.inputDrvs.begin();
i != drv.inputDrvs.end(); ++i)
{
foreach (DerivationInputs::const_iterator, i, drv.inputDrvs) {
Hash h = state.drvHashes[i->first];
if (h.type == htUnknown) {
Derivation drv2 = derivationFromPath(i->first);

60
src/libstore/local-store.cc
View file

@ -108,23 +108,6 @@ int LocalStore::getSchema()
}
void copyPath(const Path & src, const Path & dst, PathFilter & filter)
{
debug(format("copying `%1%' to `%2%'") % src % dst);
/* Dump an archive of the path `src' into a string buffer, then
restore the archive to `dst'. This is not a very good method
for very large paths, but `copyPath' is mainly used for small
files. */
StringSink sink;
dumpPath(src, sink, filter);
StringSource source(sink.s);
restorePath(dst, source);
}
void canonicalisePathMetaData(const Path & path, bool recurse)
{
checkInterrupt();
@ -332,6 +315,8 @@ void LocalStore::registerValidPath(const ValidPathInfo & info, bool ignoreValidi
appendReferrer(*i, info.path, false);
}
assert(info.hash.type == htSHA256);
string s = (format(
"Hash: sha256:%1%\n"
"References: %2%\n"
@ -676,10 +661,18 @@ Path LocalStore::addToStore(const Path & _srcPath,
Path srcPath(absPath(_srcPath));
debug(format("adding `%1%' to the store") % srcPath);
std::pair<Path, Hash> pr =
computeStorePathForPath(srcPath, recursive, hashAlgo, filter);
Path & dstPath(pr.first);
Hash & h(pr.second);
/* Read the whole path into memory. This is not a very scalable
method for very large paths, but `copyPath' is mainly used for
small files. */
StringSink sink;
if (recursive)
dumpPath(srcPath, sink, filter);
else
sink.s = readFile(srcPath);
Hash h = hashString(parseHashType(hashAlgo), sink.s);
Path dstPath = makeFixedOutputPath(recursive, hashAlgo, h, baseNameOf(srcPath));
addTempRoot(dstPath);
@ -694,19 +687,22 @@ Path LocalStore::addToStore(const Path & _srcPath,
if (pathExists(dstPath)) deletePathWrapped(dstPath);
copyPath(srcPath, dstPath, filter);
/* !!! */
#if 0
Hash h2 = hashPath(htSHA256, dstPath, filter);
if (h != h2)
throw Error(format("contents of `%1%' changed while copying it to `%2%' (%3% -> %4%)")
% srcPath % dstPath % printHash(h) % printHash(h2));
#endif
if (recursive) {
StringSource source(sink.s);
restorePath(dstPath, source);
} else
writeStringToFile(dstPath, sink.s);
canonicalisePathMetaData(dstPath);
registerValidPath(dstPath, h, PathSet(), "");
/* Register the SHA-256 hash of the NAR serialisation of
the path in the database. We may just have computed it
above (if called with recursive == true and hashAlgo ==
sha256); otherwise, compute it here. */
registerValidPath(dstPath,
(recursive && hashAlgo == "sha256") ? h :
(recursive ? hashString(htSHA256, sink.s) : hashPath(htSHA256, dstPath)),
PathSet(), "");
}
outputLock.setDeletion(true);