9e975458b4
need any info on substitutable paths, we just call the substituters (such as download-using-manifests.pl) directly. This means that it's no longer necessary for nix-pull to register substitutes or for nix-channel to clear them, which makes those operations much faster (NIX-95). Also, we don't have to worry about keeping nix-pull manifests (in /nix/var/nix/manifests) and the database in sync with each other. The downside is that there is some overhead in calling an external program to get the substitutes info. For instance, "nix-env -qas" takes a bit longer. Abolishing the substitutes table also makes the logic in local-store.cc simpler, as we don't need to store info for invalid paths. On the downside, you cannot do things like "nix-store -qR" on a substitutable but invalid path (but nobody did that anyway). * Never catch interrupts (the Interrupted exception).
107 lines
1.8 KiB
C++
107 lines
1.8 KiB
C++
#ifndef __DB_H
|
|
#define __DB_H
|
|
|
|
#include "types.hh"
|
|
|
|
#include <map>
|
|
|
|
|
|
/* Defined externally. */
|
|
class DbTxn;
|
|
class DbEnv;
|
|
class Db;
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
class Database;
|
|
|
|
|
|
class Transaction
|
|
{
|
|
friend class Database;
|
|
|
|
private:
|
|
DbTxn * txn;
|
|
|
|
public:
|
|
Transaction();
|
|
Transaction(Database & _db);
|
|
~Transaction();
|
|
|
|
void begin(Database & db);
|
|
void abort();
|
|
void commit();
|
|
|
|
void moveTo(Transaction & t);
|
|
};
|
|
|
|
|
|
#define noTxn Transaction()
|
|
|
|
|
|
typedef unsigned int TableId; /* table handles */
|
|
|
|
|
|
class Database
|
|
{
|
|
friend class Transaction;
|
|
|
|
private:
|
|
DbEnv * env;
|
|
|
|
TableId nextId;
|
|
std::map<TableId, Db *> tables;
|
|
|
|
void requireEnv();
|
|
|
|
Db * getDb(TableId table);
|
|
|
|
void open2(const string & path, bool removeOldEnv);
|
|
|
|
public:
|
|
Database();
|
|
~Database();
|
|
|
|
void open(const string & path);
|
|
void close();
|
|
|
|
TableId openTable(const string & table, bool sorted = false);
|
|
void closeTable(TableId table);
|
|
void deleteTable(const string & table);
|
|
|
|
bool queryString(const Transaction & txn, TableId table,
|
|
const string & key, string & data);
|
|
|
|
bool queryStrings(const Transaction & txn, TableId table,
|
|
const string & key, Strings & data);
|
|
|
|
void setString(const Transaction & txn, TableId table,
|
|
const string & key, const string & data);
|
|
|
|
void setStrings(const Transaction & txn, TableId table,
|
|
const string & key, const Strings & data,
|
|
bool deleteEmpty = true);
|
|
|
|
void delPair(const Transaction & txn, TableId table,
|
|
const string & key);
|
|
|
|
void enumTable(const Transaction & txn, TableId table,
|
|
Strings & keys, const string & keyPrefix = "");
|
|
|
|
void clearTable(const Transaction & txn, TableId table);
|
|
};
|
|
|
|
|
|
class DbNoPermission : public Error
|
|
{
|
|
public:
|
|
DbNoPermission(const format & f) : Error(f) { };
|
|
};
|
|
|
|
|
|
}
|
|
|
|
|
|
#endif /* !__DB_H */
|