65 lines
1.7 KiB
C++
65 lines
1.7 KiB
C++
#ifndef __GLOBALS_H
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#define __GLOBALS_H
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#include <string>
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using namespace std;
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/* Database names. */
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/* dbRefs :: Hash -> FileName
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Maintains a mapping from hashes to filenames within the NixValues
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directory. This mapping is for performance only; it can be
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reconstructed unambiguously. The reason is that names in this
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directory are not printed hashes but also might carry some
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descriptive element (e.g., "aterm-2.0-ae749a..."). Without this
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mapping, looking up a value would take O(n) time because we would
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need to read the entire directory. */
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extern string dbRefs;
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/* dbNFs :: Hash -> Hash
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Each pair (h1, h2) in this mapping records the fact that the normal
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form of an expression with hash h1 is Hash(h2).
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TODO: maybe this should be that the normal form of an expression
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with hash h1 is an expression with hash h2; this would be more
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general, but would require us to store lots of small expressions in
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the file system just to support the caching mechanism.
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*/
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extern string dbNFs;
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/* dbNetSources :: Hash -> URL
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Each pair (hash, url) in this mapping states that the value
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identified by hash can be obtained by fetching the value pointed
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to by url.
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TODO: this should be Hash -> [URL]
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TODO: factor this out into a separate tool? */
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extern string dbNetSources;
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/* Path names. */
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/* nixValues is the directory where all Nix values (both files and
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directories, and both normal and non-normal forms) live. */
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extern string nixValues;
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/* nixLogDir is the directory where we log evaluations. */
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extern string nixLogDir;
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/* nixDB is the file name of the Berkeley DB database where we
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maintain the dbXXX mappings. */
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extern string nixDB;
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/* Initialize the databases. */
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void initDB();
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#endif /* !__GLOBALS_H */
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