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* Changes to the command line syntax of Nix.

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* A function to find all Nix expressions whose output ids are
  completely contained in some set.  Useful for uploading relevant Nix
  expressions to a shared cache.
This commit is contained in:
Eelco Dolstra 2003-07-21 14:46:01 +00:00
parent 401452e57a
commit 49231fbe41
5 changed files with 115 additions and 76 deletions
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49
src/normalise.cc
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@ -248,18 +248,57 @@ Strings fstatePaths(const FSId & id, bool normalise)
}
StringSet fstateRefs(const FSId & id)
Strings fstateRefs(const FSId & id)
{
StringSet paths;
Strings paths;
Slice slice = normaliseFState(id);
for (SliceElems::const_iterator i = slice.elems.begin();
i != slice.elems.end(); i++)
paths.insert(i->path);
paths.push_back(i->path);
return paths;
}
void findGenerators(const FSIds & ids)
FSIds findGenerators(const FSIds & _ids)
{
FSIdSet ids(_ids.begin(), _ids.end());
FSIds generators;
/* !!! hack; for performance, we just look at the rhs of successor
mappings, since we know that those are Nix expressions. */
Strings sucs;
enumDB(nixDB, dbSuccessors, sucs);
for (Strings::iterator i = sucs.begin();
i != sucs.end(); i++)
{
string s;
queryDB(nixDB, dbSuccessors, *i, s);
FSId id = parseHash(s);
FState fs;
try {
/* !!! should substitutes be used? */
fs = parseFState(termFromId(id));
} catch (...) { /* !!! only catch parse errors */
continue;
}
if (fs.type != FState::fsSlice) continue;
bool okay = true;
for (SliceElems::const_iterator i = fs.slice.elems.begin();
i != fs.slice.elems.end(); i++)
if (ids.find(i->id) == ids.end()) {
okay = false;
break;
}
if (!okay) continue;
generators.push_back(id);
}
return generators;
}