* A command to register successor fstate expressions.

Unifying substitutes and successors isn't very feasible for now,
  since substitutes are only used when no path with a certain is
  known.  Therefore, a normal form of some expression stored as a
  substitute would not be used unless the expression itself was
  missing.
This commit is contained in:
Eelco Dolstra 2003-07-10 18:48:11 +00:00
parent 8511571f65
commit e5fbf58041
3 changed files with 28 additions and 1 deletions

View file

@ -179,6 +179,12 @@ Hash writeTerm(ATerm t, const string & suffix, string * p)
}
void registerSuccessor(const Hash & fsHash, const Hash & scHash)
{
setDB(nixDB, dbSuccessors, fsHash, scHash);
}
FState storeSuccessor(FState fs, FState sc, StringSet & paths)
{
if (fs == sc) return sc;
@ -186,7 +192,7 @@ FState storeSuccessor(FState fs, FState sc, StringSet & paths)
string path;
Hash fsHash = hashTerm(fs);
Hash scHash = writeTerm(sc, "-s-" + (string) fsHash, &path);
setDB(nixDB, dbSuccessors, fsHash, scHash);
registerSuccessor(fsHash, scHash);
paths.insert(path);
#if 0

View file

@ -93,5 +93,8 @@ ATerm termFromHash(const Hash & hash, string * p = 0);
/* Write an aterm to the Nix store directory, and return its hash. */
Hash writeTerm(ATerm t, const string & suffix, string * p = 0);
/* Register a successor. */
void registerSuccessor(const Hash & fsHash, const Hash & scHash);
#endif /* !__EVAL_H */

View file

@ -26,6 +26,7 @@ static ArgType argType = atpUnknown;
--add / -A: copy a path to the Nix store
--query / -q: query information
--successor: register a successor expression
--substitute: register a substitute expression
--dump: dump a path as a Nix archive
@ -183,6 +184,21 @@ static void opQuery(Strings opFlags, Strings opArgs)
}
static void opSuccessor(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() % 2) throw UsageError("expecting even number of arguments");
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); )
{
Hash fsHash = parseHash(*i++);
Hash scHash = parseHash(*i++);
registerSuccessor(fsHash, scHash);
}
}
static void opSubstitute(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
@ -288,6 +304,8 @@ void run(Strings args)
op = opAdd;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--successor")
op = opSuccessor;
else if (arg == "--substitute")
op = opSubstitute;
else if (arg == "--dump")