80 lines
1.8 KiB
C++
80 lines
1.8 KiB
C++
#ifndef __GLOBALS_H
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#define __GLOBALS_H
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#include <string>
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#include "db.hh"
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using namespace std;
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extern Database nixDB;
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/* Database tables. */
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/* dbPath2Id :: Path -> FSId
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Each pair (p, id) records that path $p$ contains an expansion of
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$id$. */
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extern TableId dbPath2Id;
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/* dbId2Paths :: FSId -> [Path]
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A mapping from ids to lists of paths. */
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extern TableId dbId2Paths;
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/* dbSuccessors :: FSId -> FSId
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Each pair $(id_1, id_2)$ in this mapping records the fact that a
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successor of an fstate expression stored in a file with identifier
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$id_1$ is stored in a file with identifier $id_2$.
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Note that a term $y$ is successor of $x$ iff there exists a
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sequence of rewrite steps that rewrites $x$ into $y$.
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*/
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extern TableId dbSuccessors;
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/* dbSubstitutes :: FSId -> [FSId]
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Each pair $(id, [ids])$ tells Nix that it can realise any of the
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fstate expressions referenced by the identifiers in $ids$ to
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generate a path with identifier $id$.
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The main purpose of this is for distributed caching of derivates.
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One system can compute a derivate with hash $h$ and put it on a
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website (as a Nix archive), for instance, and then another system
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can register a substitute for that derivate. The substitute in
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this case might be an fstate expression that fetches the Nix
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archive.
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*/
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extern TableId dbSubstitutes;
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/* Path names. */
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/* nixStore is the directory where we generally store atomic and
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derived files. */
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extern string nixStore;
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extern string nixDataDir; /* !!! fix */
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/* nixLogDir is the directory where we log various operations. */
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extern string nixLogDir;
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/* nixDBPath is the path name of our Berkeley DB environment. */
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extern string nixDBPath;
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/* Open the database environment. */
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void openDB();
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/* Create the required database tables. */
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void initDB();
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#endif /* !__GLOBALS_H */
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