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* In normaliseFState(), wrap registration of the output paths and the

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normal form in a single transaction to ensure that if we crash,
  either everything is registered or nothing is.  This is for
  recoverability: unregistered paths in the store can be deleted
  arbitrarily, while registered paths can only be deleted by running
  the garbage collector.
This commit is contained in:
Eelco Dolstra 2003-08-01 15:41:47 +00:00
parent d99d04e644
commit c95b4ad290
6 changed files with 44 additions and 28 deletions
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6
src/nix.cc
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@ -239,14 +239,16 @@ static void opSuccessor(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() % 2) throw UsageError("expecting even number of arguments");
Transaction txn(nixDB); /* !!! this could be a big transaction */
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); )
{
FSId id1 = parseHash(*i++);
FSId id2 = parseHash(*i++);
registerSuccessor(id1, id2);
registerSuccessor(txn, id1, id2);
}
txn.commit();
}