forked from lix-project/lix
truncate WAL files on exit
Fix for https://github.com/NixOS/nix/issues/1030018a2620273
enabled persistent WAL files that will never get truncated. to fix this, journal_size_limit is set to 2^40, which results in the WAL files being truncated to 0 on exit, as well as limiting the WAL files to 2^40 bytes following a checkpoint. this aligns lix with the nix change: https://github.com/NixOS/nix/pull/10301 https://www.sqlite.org/c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlpersistwal https://www.sqlite.org/pragma.html#pragma_journal_size_limited517a7082/src/wal.c (L2518)
PR-Link: https://github.com/lix-project/lix/pull/9 Co-Authored-By: paparodeo <170618376+paparodeo@users.noreply.github.com> Change-Id:I90ec1a467c92c582ff8c07dd363a4cf789782214
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@ -550,7 +550,12 @@ void LocalStore::openDB(State & state, bool create)
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if (mode == "wal" ) {
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/* persist the WAL files when the DB connection is closed.
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* This allows for read-only connections without any write permissions
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* on the state directory to succeed on a closed database. */
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* on the state directory to succeed on a closed database. Setting the
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* journal_size_limit to 2^40 bytes results in the WAL files getting
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* truncated to 0 on exit and limits the on disk size of the WAL files
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* to 2^40 bytes following a checkpoint */
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if (sqlite3_exec(db, "pragma main.journal_size_limit = 1099511627776;", 0, 0, 0) != SQLITE_OK)
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SQLiteError::throw_(db, "setting journal_size_limit");
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int enable = 1;
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if (sqlite3_file_control(db, NULL, SQLITE_FCNTL_PERSIST_WAL, &enable) != SQLITE_OK)
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SQLiteError::throw_(db, "setting persistent WAL mode");
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