forked from lix-project/lix
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).
108 lines
1.8 KiB
C++
108 lines
1.8 KiB
C++
#ifndef __DB_H
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#define __DB_H
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#include "types.hh"
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#include <map>
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/* Defined externally. */
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class DbTxn;
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class DbEnv;
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class Db;
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namespace nix {
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class Database;
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class Transaction
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{
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friend class Database;
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private:
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DbTxn * txn;
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public:
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Transaction();
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Transaction(Database & _db);
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~Transaction();
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void begin(Database & db);
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void abort();
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void commit();
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void moveTo(Transaction & t);
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};
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#define noTxn Transaction()
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typedef unsigned int TableId; /* table handles */
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class Database
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{
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friend class Transaction;
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private:
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DbEnv * env;
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TableId nextId;
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std::map<TableId, Db *> tables;
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void requireEnv();
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Db * getDb(TableId table);
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void open2(const string & path, bool removeOldEnv);
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public:
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Database();
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~Database();
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void open(const string & path);
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void close();
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TableId openTable(const string & table, bool sorted = false);
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void closeTable(TableId table);
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void deleteTable(const string & table);
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bool queryString(const Transaction & txn, TableId table,
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const string & key, string & data);
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bool queryStrings(const Transaction & txn, TableId table,
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const string & key, Strings & data);
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void setString(const Transaction & txn, TableId table,
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const string & key, const string & data);
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void setStrings(const Transaction & txn, TableId table,
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const string & key, const Strings & data,
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bool deleteEmpty = true);
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void delPair(const Transaction & txn, TableId table,
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const string & key);
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void enumTable(const Transaction & txn, TableId table,
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Strings & keys, const string & keyPrefix = "");
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void clearTable(const Transaction & txn, TableId table);
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};
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class DbNoPermission : public Error
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{
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public:
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DbNoPermission(const format & f) : Error(f) { };
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};
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}
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#endif /* !__DB_H */
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