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* Get rid of the substitutes database table (NIX-47). Instead, if we

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need any info on substitutable paths, we just call the substituters
  (such as download-using-manifests.pl) directly.  This means that
  it's no longer necessary for nix-pull to register substitutes or for
  nix-channel to clear them, which makes those operations much faster
  (NIX-95).  Also, we don't have to worry about keeping nix-pull
  manifests (in /nix/var/nix/manifests) and the database in sync with
  each other.

  The downside is that there is some overhead in calling an external
  program to get the substitutes info.  For instance, "nix-env -qas"
  takes a bit longer.

  Abolishing the substitutes table also makes the logic in
  local-store.cc simpler, as we don't need to store info for invalid
  paths.  On the downside, you cannot do things like "nix-store -qR"
  on a substitutable but invalid path (but nobody did that anyway).

* Never catch interrupts (the Interrupted exception).
This commit is contained in:
Eelco Dolstra 2007-08-12 00:29:28 +00:00
parent 4695f4edd6
commit 9e975458b4
24 changed files with 357 additions and 469 deletions
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13
src/libstore/db.cc
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@ -194,7 +194,8 @@ void Database::open2(const string & path, bool removeOldEnv)
env->set_errcall(errorPrinter);
env->set_msgcall(messagePrinter);
//env->set_verbose(DB_VERB_REGISTER, 1);
if (getEnv("NIX_DEBUG_DB_REGISTER") == "1")
env->set_verbose(DB_VERB_REGISTER, 1);
env->set_verbose(DB_VERB_RECOVERY, 1);
/* Smaller log files. */
@ -454,4 +455,14 @@ void Database::enumTable(const Transaction & txn, TableId table,
}
void Database::clearTable(const Transaction & txn, TableId table)
{
try {
Db * db = getDb(table);
u_int32_t count;
db->truncate(txn.txn, &count, 0);
} catch (DbException e) { rethrow(e); }
}
}