93 lines
2.0 KiB
C++
93 lines
2.0 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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/* dbValidPaths :: Path -> ()
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The existence of a key $p$ indicates that path $p$ is valid (that
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is, produced by a succesful build). */
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extern TableId dbValidPaths;
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/* dbSuccessors :: Path -> Path
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Each pair $(p_1, p_2)$ in this mapping records the fact that the
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Nix expression stored at path $p_1$ has a successor expression
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stored at path $p_2$.
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Note that a term $y$ is a 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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/* dbSuccessorsRev :: Path -> [Path]
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The reverse mapping of dbSuccessors.
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*/
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extern TableId dbSuccessorsRev;
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/* dbSubstitutes :: Path -> [Path]
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Each pair $(p, [ps])$ tells Nix that it can realise any of the
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Nix expressions stored at paths $ps$ to produce a path $p$.
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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 and put it on a website (as a Nix
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archive), for instance, and then another system can register a
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substitute for that derivate. The substitute in this case might be
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a Nix expression that fetches the Nix archive.
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*/
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extern TableId dbSubstitutes;
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/* dbSubstitutesRev :: Path -> [Path]
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The reverse mapping of dbSubstitutes.
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*/
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extern TableId dbSubstitutesRev;
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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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/* Misc. global flags. */
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/* Whether to keep temporary directories of failed builds. */
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extern bool keepFailed;
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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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