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fix: Sql::import: Detach backup db if any step of the import fails

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Otherwise we continue to work with an incompletely imported db... but only until restart -- after
that all changes to the db are lost.
This commit is contained in:
iequidoo
2023-12-05 21:09:07 -03:00
committed by iequidoo
parent cccefe15b3
commit bfc7ae1eff
1 changed files with 39 additions and 35 deletions
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74
src/sql.rs
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@@ -137,46 +137,50 @@ impl Sql {
.to_str()
.with_context(|| format!("path {path:?} is not valid unicode"))?
.to_string();
let res = self
.call_write(move |conn| {
// Check that backup passphrase is correct before resetting our database.
conn.execute("ATTACH DATABASE ? AS backup KEY ?", (path_str, passphrase))
.context("failed to attach backup database")?;
if let Err(err) = conn
.query_row("SELECT count(*) FROM sqlite_master", [], |_row| Ok(()))
.context("backup passphrase is not correct")
{
conn.execute("DETACH DATABASE backup", [])
.context("failed to detach backup database")?;
return Err(err);
}
// Reset the database without reopening it. We don't want to reopen the database because we
// don't have main database passphrase at this point.
// See <https://sqlite.org/c3ref/c_dbconfig_enable_fkey.html> for documentation.
// Without resetting import may fail due to existing tables.
// Keep `config_cache` locked all the time the db is imported so that nobody can use invalid
// values from there. And clear it immediately so as not to forget in case of errors.
let mut config_cache = self.config_cache.write().await;
config_cache.clear();
self.call_write(move |conn| {
// Check that backup passphrase is correct before resetting our database.
conn.execute("ATTACH DATABASE ? AS backup KEY ?", (path_str, passphrase))
.context("failed to attach backup database")?;
let res = conn
.query_row("SELECT count(*) FROM sqlite_master", [], |_row| Ok(()))
.context("backup passphrase is not correct");
// Reset the database without reopening it. We don't want to reopen the database because we
// don't have main database passphrase at this point.
// See <https://sqlite.org/c3ref/c_dbconfig_enable_fkey.html> for documentation.
// Without resetting import may fail due to existing tables.
let res = res.and_then(|_| {
conn.set_db_config(DbConfig::SQLITE_DBCONFIG_RESET_DATABASE, true)
.context("failed to set SQLITE_DBCONFIG_RESET_DATABASE")?;
.context("failed to set SQLITE_DBCONFIG_RESET_DATABASE")
});
let res = res.and_then(|_| {
conn.execute("VACUUM", [])
.context("failed to vacuum the database")?;
.context("failed to vacuum the database")
});
let res = res.and(
conn.set_db_config(DbConfig::SQLITE_DBCONFIG_RESET_DATABASE, false)
.context("failed to unset SQLITE_DBCONFIG_RESET_DATABASE")?;
let res = conn
.query_row("SELECT sqlcipher_export('main', 'backup')", [], |_row| {
Ok(())
})
.context("failed to import from attached backup database");
.context("failed to unset SQLITE_DBCONFIG_RESET_DATABASE"),
);
let res = res.and_then(|_| {
conn.query_row("SELECT sqlcipher_export('main', 'backup')", [], |_row| {
Ok(())
})
.context("failed to import from attached backup database")
});
let res = res.and(
conn.execute("DETACH DATABASE backup", [])
.context("failed to detach backup database")?;
res?;
Ok(())
})
.await;
// The config cache is wrong now that we have a different database
self.config_cache.write().await.clear();
res
.context("failed to detach backup database"),
);
res?;
Ok(())
})
.await
}
/// Creates a new connection pool.