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Rename ReadOnly to Immutable and clarify its purpose.

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Ben Radford 2023-05-16 15:48:40 +01:00
parent aa376f4ab1
commit b1a7b26eef
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GPG key ID: 9DF5D4640AB888D5
3 changed files with 9 additions and 7 deletions
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2
src/libstore/local-store.cc
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@ -490,7 +490,7 @@ void LocalStore::openDB(State & state, bool create)
/* Open the Nix database. */ /* Open the Nix database. */
std::string dbPath = dbDir + "/db.sqlite"; std::string dbPath = dbDir + "/db.sqlite";
auto & db(state.db); auto & db(state.db);
auto openMode = readOnly ? SQLiteOpenMode::ReadOnly auto openMode = readOnly ? SQLiteOpenMode::Immutable
: create ? SQLiteOpenMode::Normal : create ? SQLiteOpenMode::Normal
: SQLiteOpenMode::NoCreate; : SQLiteOpenMode::NoCreate;
state.db = SQLite(dbPath, openMode); state.db = SQLite(dbPath, openMode);

7
src/libstore/sqlite.cc
View file

@ -53,15 +53,14 @@ static void traceSQL(void * x, const char * sql)
SQLite::SQLite(const Path & path, SQLiteOpenMode mode) SQLite::SQLite(const Path & path, SQLiteOpenMode mode)
{ {
bool readOnly = mode == SQLiteOpenMode::ReadOnly;
// useSQLiteWAL also indicates what virtual file system we need. Using // useSQLiteWAL also indicates what virtual file system we need. Using
// `unix-dotfile` is needed on NFS file systems and on Windows' Subsystem // `unix-dotfile` is needed on NFS file systems and on Windows' Subsystem
// for Linux (WSL) where useSQLiteWAL should be false by default. // for Linux (WSL) where useSQLiteWAL should be false by default.
const char *vfs = settings.useSQLiteWAL ? 0 : "unix-dotfile"; const char *vfs = settings.useSQLiteWAL ? 0 : "unix-dotfile";
int flags = readOnly ? SQLITE_OPEN_READONLY : SQLITE_OPEN_READWRITE; bool immutable = mode == SQLiteOpenMode::Immutable;
int flags = immutable ? SQLITE_OPEN_READONLY : SQLITE_OPEN_READWRITE;
if (mode == SQLiteOpenMode::Normal) flags |= SQLITE_OPEN_CREATE; if (mode == SQLiteOpenMode::Normal) flags |= SQLITE_OPEN_CREATE;
auto uri = "file:" + percentEncode(path) + "?immutable=" + (readOnly ? "1" : "0"); auto uri = "file:" + percentEncode(path) + "?immutable=" + (immutable ? "1" : "0");
int ret = sqlite3_open_v2(uri.c_str(), &db, SQLITE_OPEN_URI | flags, vfs); int ret = sqlite3_open_v2(uri.c_str(), &db, SQLITE_OPEN_URI | flags, vfs);
if (ret != SQLITE_OK) { if (ret != SQLITE_OK) {
const char * err = sqlite3_errstr(ret); const char * err = sqlite3_errstr(ret);

7
src/libstore/sqlite.hh
View file

@ -23,10 +23,13 @@ enum class SQLiteOpenMode {
*/ */
NoCreate, NoCreate,
/** /**
* Open the database in read-only mode. * Open the database in immutable mode.
* In addition to the database being read-only,
* no wal or journal files will be created by sqlite.
* Use this mode if the database is on a read-only filesystem.
* Fails with an error if the database does not exist. * Fails with an error if the database does not exist.
*/ */
ReadOnly Immutable
}; };
/** /**