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Simplify

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This commit is contained in:
Eelco Dolstra 2021-10-08 14:58:35 +02:00
parent dced45f146
commit 1785ba2980
2 changed files with 88 additions and 88 deletions
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172
src/libstore/gc.cc
View file

@ -479,21 +479,36 @@ struct LocalStore::GCState
};
void LocalStore::deleteFromStore(GCState & state, std::string_view baseName)
{
Path path = storeDir + "/" + std::string(baseName);
Path realPath = realStoreDir + "/" + std::string(baseName);
printInfo("deleting '%1%'", path);
state.results.paths.insert(path);
uint64_t bytesFreed;
deletePath(realPath, bytesFreed);
state.results.bytesFreed += bytesFreed;
if (state.results.bytesFreed > state.options.maxFreed) {
printInfo("deleted more than %d bytes; stopping", state.options.maxFreed);
throw GCLimitReached();
}
}
bool LocalStore::tryToDelete(
GCState & state,
StorePathSet & visited,
const Path & path,
const StorePath & path,
bool recursive)
{
checkInterrupt();
auto realPath = realStoreDir + "/" + std::string(baseNameOf(path));
if (realPath == linksDir) return false;
//Activity act(*logger, lvlDebug, format("considering whether to delete '%1%'") % path);
auto storePath = maybeParseStorePath(path);
/* Wake up any client waiting for deletion of this path to
finish. */
Finally releasePending([&]() {
@ -502,89 +517,66 @@ bool LocalStore::tryToDelete(
state.wakeup.notify_all();
});
if (storePath) {
if (!visited.insert(path).second) return true;
if (!visited.insert(*storePath).second) return true;
if (state.alive.count(path)) return false;
if (state.alive.count(*storePath)) return false;
if (state.dead.count(path)) return true;
if (state.dead.count(*storePath)) return true;
if (state.roots.count(*storePath)) {
debug("cannot delete '%s' because it's a root", path);
state.alive.insert(*storePath);
return false;
}
if (isValidPath(*storePath)) {
StorePathSet incoming;
/* Don't delete this path if any of its referrers are alive. */
queryReferrers(*storePath, incoming);
/* If keep-derivations is set and this is a derivation, then
don't delete the derivation if any of the outputs are alive. */
if (state.gcKeepDerivations && storePath->isDerivation()) {
for (auto & [name, maybeOutPath] : queryPartialDerivationOutputMap(*storePath))
if (maybeOutPath &&
isValidPath(*maybeOutPath) &&
queryPathInfo(*maybeOutPath)->deriver == *storePath)
incoming.insert(*maybeOutPath);
}
/* If keep-outputs is set, then don't delete this path if there
are derivers of this path that are not garbage. */
if (state.gcKeepOutputs) {
auto derivers = queryValidDerivers(*storePath);
for (auto & i : derivers)
incoming.insert(i);
}
for (auto & i : incoming)
if (i != *storePath
&& (recursive || state.options.pathsToDelete.count(i))
&& !tryToDelete(state, visited, printStorePath(i), recursive))
{
state.alive.insert(*storePath);
return false;
}
}
{
auto hashPart = std::string(storePath->hashPart());
auto shared(state.shared.lock());
if (shared->tempRoots.count(hashPart))
return false;
shared->pending = hashPart;
}
state.dead.insert(*storePath);
if (state.shouldDelete)
invalidatePathChecked(*storePath);
if (state.roots.count(path)) {
debug("cannot delete '%s' because it's a root", printStorePath(path));
state.alive.insert(path);
return false;
}
if (isValidPath(path)) {
StorePathSet incoming;
/* Don't delete this path if any of its referrers are alive. */
queryReferrers(path, incoming);
/* If keep-derivations is set and this is a derivation, then
don't delete the derivation if any of the outputs are
alive. */
if (state.gcKeepDerivations && path.isDerivation()) {
for (auto & [name, maybeOutPath] : queryPartialDerivationOutputMap(path))
if (maybeOutPath &&
isValidPath(*maybeOutPath) &&
queryPathInfo(*maybeOutPath)->deriver == path)
incoming.insert(*maybeOutPath);
}
/* If keep-outputs is set, then don't delete this path if
there are derivers of this path that are not garbage. */
if (state.gcKeepOutputs) {
auto derivers = queryValidDerivers(path);
for (auto & i : derivers)
incoming.insert(i);
}
for (auto & i : incoming)
if (i != path
&& (recursive || state.options.pathsToDelete.count(i))
&& !tryToDelete(state, visited, i, recursive))
{
state.alive.insert(path);
return false;
}
}
{
auto hashPart = std::string(path.hashPart());
auto shared(state.shared.lock());
if (shared->tempRoots.count(hashPart))
return false;
shared->pending = hashPart;
}
state.dead.insert(path);
if (state.shouldDelete) {
Path realPath = realStoreDir + "/" + std::string(baseNameOf(path));
struct stat st;
if (lstat(realPath.c_str(), &st)) {
if (errno == ENOENT) return true;
throw SysError("getting status of %1%", realPath);
}
printInfo("deleting '%1%'", path);
state.results.paths.insert(path);
uint64_t bytesFreed;
deletePath(realPath, bytesFreed);
state.results.bytesFreed += bytesFreed;
if (state.results.bytesFreed > state.options.maxFreed) {
printInfo("deleted more than %d bytes; stopping", state.options.maxFreed);
throw GCLimitReached();
}
invalidatePathChecked(path);
deleteFromStore(state, path.to_string());
}
return true;
@ -777,7 +769,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
for (auto & i : options.pathsToDelete) {
StorePathSet visited;
if (!tryToDelete(state, visited, printStorePath(i), false))
if (!tryToDelete(state, visited, i, false))
throw Error(
"cannot delete path '%1%' since it is still alive. "
"To find out why, use: "
@ -799,14 +791,20 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
/* Read the store and delete all paths that are invalid or
unreachable. We don't use readDirectory() here so that
GCing can start faster. */
auto linksName = baseNameOf(linksDir);
Paths entries;
struct dirent * dirent;
while (errno = 0, dirent = readdir(dir.get())) {
checkInterrupt();
string name = dirent->d_name;
if (name == "." || name == "..") continue;
StorePathSet visited;
tryToDelete(state, visited, storeDir + "/" + name, true);
if (name == "." || name == ".." || name == linksName) continue;
if (auto storePath = maybeParseStorePath(storeDir + "/" + name)) {
StorePathSet visited;
tryToDelete(state, visited, *storePath, true);
} else
deleteFromStore(state, name);
}
} catch (GCLimitReached & e) {
}

4
src/libstore/local-store.hh
View file

@ -243,9 +243,11 @@ private:
bool tryToDelete(
GCState & state,
StorePathSet & visited,
const Path & path,
const StorePath & path,
bool recursive);
void deleteFromStore(GCState & state, std::string_view baseName);
void findRoots(const Path & path, unsigned char type, Roots & roots);
void findRootsNoTemp(Roots & roots, bool censor);