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nd)Author
2016-10-28daemon: Do not error out when deduplication fails due to ENOSPC....This solves a problem whereby if /gnu/store/.links had enough entries,
ext4's directory index would be full, leading to link(2) returning
ENOSPC.

* nix/libstore/optimise-store.cc (LocalStore::optimisePath_): Upon
ENOSPC from link(2), print a message and return instead of throwing a
'SysError'.
Ludovic Courtès
2016-10-28daemon: Improve the SQLite wrapper API....In particular, this eliminates a bunch of boilerplate code.

Also integrates these Nix commits:

  80da7a6 Probably fix SQLITE_BUSY errors
  37a337b throwSQLiteError(): Check for SIGINT so we don't loop forever

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Eelco Dolstra
2016-10-28daemon: Factor out SQLite handling....* nix/libstore/local-store.cc: Move SQLite code to...
* nix/libstore/sqlite.cc, nix/libstore/sqlite.hh: ... here.  New files.
* nix/local.mk (libstore_a_SOURCES): Add sqlite.cc.
(libstore_headers): Add sqlite.hh.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Eelco Dolstra
2016-10-28daemon: Turn retrying SQLite transactions into a higher-order function....* nix/libstore/local-store.cc (retry_sqlite, end_retry_sqlite): Remove.
(retrySQLite): New template.
(LocalStore::registerFailedPath, LocalStore::hasPathFailed)
(LocalStore::queryFailedPaths, LocalStore::clearFailedPaths)
(LocalStore::queryPathInfo, LocalStore::isValidPath_)
(LocalStore::queryValidPaths, LocalStore::queryAllValidPaths)
(LocalStore::queryReferrers, LocalStore::queryValidDerivers)
(LocalStore::queryDerivationOutputs)
(LocalStore::queryDerivationOutputNames)
(LocalStore::queryPathFromHashPart, LocalStore::registerValidPaths)
(LocalStore::invalidatePathChecked): Use it.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Eelco Dolstra