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#ifndef __GLOBALS_H
#define __GLOBALS_H
#include <string>
using namespace std;
/* Database names. */
/* dbRefs :: Hash -> Path
Maintains a mapping from hashes to paths. This is what we use to
resolve CHash(hash) content descriptors. */
extern string dbRefs;
/* dbSuccessors :: Hash -> Hash
Each pair (h1, h2) in this mapping records the fact that a
successor of an fstate expression with hash h1 is stored in a file
with hash h2.
Note that a term $y$ is successor of $x$ iff there exists a
sequence of rewrite steps that rewrites $x$ into $y$.
Also note that instead of a successor, $y$ can be any term
equivalent to $x$, that is, reducing to the same result, as long as
$x$ is equal to or a successor of $y$. (This is useful, e.g., for
shared derivate caching over the network).
*/
extern string dbSuccessors;
/* dbNetSources :: Hash -> URL
Each pair (hash, url) in this mapping states that the value
identified by hash can be obtained by fetching the value pointed
to by url.
TODO: this should be Hash -> [URL]
TODO: factor this out into a separate tool? */
extern string dbNetSources;
/* Path names. */
/* nixStore is the directory where we generally store atomic and
derived files. */
extern string nixStore;
/* nixLogDir is the directory where we log various operations. */
extern string nixLogDir;
/* nixDB is the file name of the Berkeley DB database where we
maintain the dbXXX mappings. */
extern string nixDB;
/* Initialize the databases. */
void initDB();
#endif /* !__GLOBALS_H */
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