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Add flake evaluation cache

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This exploits the hermetic nature of flake evaluation to speed up
repeated evaluations of a flake output attribute.

For example (doing 'nix build' on an already present package):

  $ time nix build nixpkgs:firefox

  real    0m1.497s
  user    0m1.160s
  sys     0m0.139s

  $ time nix build nixpkgs:firefox

  real    0m0.052s
  user    0m0.038s
  sys     0m0.007s

The cache is ~/.cache/nix/eval-cache-v1.sqlite, which has entries like

  INSERT INTO Attributes VALUES(
    X'92a907d4efe933af2a46959b082cdff176aa5bfeb47a98fabd234809a67ab195',
    'packages.firefox',
    1,
    '/nix/store/pbalzf8x19hckr8cwdv62rd6g0lqgc38-firefox-67.0.drv /nix/store/g6q0gx0v6xvdnizp8lrcw7c4gdkzana0-firefox-67.0 out');

where the hash 92a9... is a fingerprint over the flake store path and
the contents of the lockfile. Because flakes are evaluated in pure
mode, this uniquely identifies the evaluation result.
This commit is contained in:
Eelco Dolstra 2019-06-07 22:25:48 +02:00
parent 671f16aee0
commit 6644b6099b
No known key found for this signature in database
GPG key ID: 8170B4726D7198DE
9 changed files with 293 additions and 49 deletions
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9
src/libstore/local-store.cc
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@ -294,9 +294,7 @@ void LocalStore::openDB(State & state, bool create)
/* Open the Nix database. */
string dbPath = dbDir + "/db.sqlite";
auto & db(state.db);
if (sqlite3_open_v2(dbPath.c_str(), &db.db,
SQLITE_OPEN_READWRITE | (create ? SQLITE_OPEN_CREATE : 0), 0) != SQLITE_OK)
throw Error(format("cannot open Nix database '%1%'") % dbPath);
state.db = SQLite(dbPath, create);
#ifdef __CYGWIN__
/* The cygwin version of sqlite3 has a patch which calls
@ -308,11 +306,6 @@ void LocalStore::openDB(State & state, bool create)
SetDllDirectoryW(L"");
#endif
if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK)
throwSQLiteError(db, "setting timeout");
db.exec("pragma foreign_keys = 1");
/* !!! check whether sqlite has been built with foreign key
support */