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* `nix-store --verify --check-contents': don't hold the global GC lock

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while checking the contents, since this operation can take a very
  long time to finish.  Also, fill in missing narSize fields in the DB
  while doing this.
This commit is contained in:
Eelco Dolstra 2010-12-06 15:29:38 +00:00
parent de79d23f76
commit 8062d3af30
2 changed files with 48 additions and 10 deletions
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55
src/libstore/local-store.cc
View file

@ -353,6 +353,8 @@ void LocalStore::openDB(bool create)
/* Prepare SQL statements. */
stmtRegisterValidPath.create(db,
"insert into ValidPaths (path, hash, registrationTime, deriver, narSize) values (?, ?, ?, ?, ?);");
stmtUpdatePathInfo.create(db,
"update ValidPaths set narSize = ? where path = ?;");
stmtAddReference.create(db,
"insert or replace into Refs (referrer, reference) values (?, ?);");
stmtQueryPathInfo.create(db,
@ -645,6 +647,21 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path)
}
/* Update path info in the database. Currently only updated the
narSize field. */
void LocalStore::updatePathInfo(const ValidPathInfo & info)
{
SQLiteStmtUse use(stmtUpdatePathInfo);
if (info.narSize != 0)
stmtUpdatePathInfo.bind64(info.narSize);
else
stmtUpdatePathInfo.bind(); // null
stmtUpdatePathInfo.bind(info.path);
if (sqlite3_step(stmtUpdatePathInfo) != SQLITE_DONE)
throwSQLiteError(db, format("updating info of path `%1%' in database") % info.path);
}
unsigned long long LocalStore::queryValidPathId(const Path & path)
{
SQLiteStmtUse use(stmtQueryPathInfo);
@ -1305,23 +1322,41 @@ void LocalStore::verifyStore(bool checkContents)
foreach (PathSet::iterator, i, validPaths2)
verifyPath(*i, store, done, validPaths);
/* Release the GC lock so that checking content hashes (which can
take ages) doesn't block the GC or builds. */
fdGCLock.close();
/* Optionally, check the content hashes (slow). */
if (checkContents) {
printMsg(lvlInfo, "checking hashes...");
foreach (PathSet::iterator, i, validPaths) {
ValidPathInfo info = queryPathInfo(*i);
try {
ValidPathInfo info = queryPathInfo(*i);
/* Check the content hash (optionally - slow). */
printMsg(lvlTalkative, format("checking contents of `%1%'") % *i);
Hash current = hashPath(info.hash.type, *i).first;
if (current != info.hash) {
printMsg(lvlError, format("path `%1%' was modified! "
"expected hash `%2%', got `%3%'")
% *i % printHash(info.hash) % printHash(current));
/* Check the content hash (optionally - slow). */
printMsg(lvlTalkative, format("checking contents of `%1%'") % *i);
HashResult current = hashPath(info.hash.type, *i);
if (current.first != info.hash) {
printMsg(lvlError, format("path `%1%' was modified! "
"expected hash `%2%', got `%3%'")
% *i % printHash(info.hash) % printHash(current.first));
} else {
/* Fill in missing narSize fields (from old stores). */
if (info.narSize == 0) {
printMsg(lvlError, format("updating size field on `%1%' to %2%") % *i % current.second);
info.narSize = current.second;
updatePathInfo(info);
}
}
} catch (Error & e) {
/* It's possible that the path got GC'ed, so ignore
errors on invalid paths. */
if (isValidPath(*i)) throw;
printMsg(lvlError, format("warning: %1%") % e.msg());
}
/* !!! Check info.narSize */
}
}
}

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

@ -203,6 +203,7 @@ private:
/* Some precompiled SQLite statements. */
SQLiteStmt stmtRegisterValidPath;
SQLiteStmt stmtUpdatePathInfo;
SQLiteStmt stmtAddReference;
SQLiteStmt stmtQueryPathInfo;
SQLiteStmt stmtQueryReferences;
@ -235,6 +236,8 @@ private:
void verifyPath(const Path & path, const PathSet & store,
PathSet & done, PathSet & validPaths);
void updatePathInfo(const ValidPathInfo & info);
void upgradeStore6();
PathSet queryValidPathsOld();
ValidPathInfo queryPathInfoOld(const Path & path);