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* Started removing closure store expressions, i.e., the explicit

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representation of closures as ATerms in the Nix store.  Instead, the
  file system pointer graph is now stored in the Nix database.  This
  has many advantages:

  - It greatly simplifies the implementation (we can drop the notion
    of `successors', and so on).

  - It makes registering roots for the garbage collector much easier.
    Instead of specifying the closure expression as a root, you can
    simply specify the store path that must be retained as a root.
    This could not be done previously, since there was no way to find
    the closure store expression containing a given store path.
    
  - Better traceability: it is now possible to query what paths are
    referenced by a path, and what paths refer to a path.
This commit is contained in:
Eelco Dolstra 2005-01-19 11:16:11 +00:00
parent e9762e2d10
commit 863dcff6c5
15 changed files with 407 additions and 890 deletions
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6
src/nix-env/main.cc
View file

@ -222,13 +222,13 @@ void createUserEnv(EvalState & state, const DrvInfos & drvs,
abort();
/* Realise the resulting store expression. */
debug(format("realising user environment"));
Path nfPath = realiseStoreExpr(topLevelDrv.drvPath);
debug(format("building user environment"));
buildDerivation(topLevelDrv.drvPath);
/* Switch the current user environment to the output path. */
debug(format("switching to new user environment"));
Path generation = createGeneration(profile,
topLevelDrv.outPath, topLevelDrv.drvPath, nfPath);
topLevelDrv.outPath, topLevelDrv.drvPath);
switchLink(profile, generation);
}

18
src/nix-env/profiles.cc
View file

@ -18,7 +18,7 @@ static int parseName(const string & profileName, const string & name)
{
if (string(name, 0, profileName.size() + 1) != profileName + "-") return -1;
string s = string(name, profileName.size() + 1);
int p = s.find("-link");
unsigned int p = s.find("-link");
if (p == string::npos) return -1;
int n;
if (string2Int(string(s, 0, p), n) && n >= 0)
@ -62,17 +62,15 @@ Generations findGenerations(Path profile, int & curGen)
static void makeNames(const Path & profile, unsigned int num,
Path & generation, Path & gcrootDrv, Path & gcrootClr)
Path & generation, Path & gcrootDrv)
{
Path prefix = (format("%1%-%2%") % profile % num).str();
generation = prefix + "-link";
gcrootDrv = prefix + "-drv.gcroot";
gcrootClr = prefix + "-clr.gcroot";
}
Path createGeneration(Path profile, Path outPath,
Path drvPath, Path clrPath)
Path createGeneration(Path profile, Path outPath, Path drvPath)
{
/* The new generation number should be higher than old the
previous ones. */
@ -81,10 +79,10 @@ Path createGeneration(Path profile, Path outPath,
unsigned int num = gens.size() > 0 ? gens.front().number : 0;
/* Create the new generation. */
Path generation, gcrootDrv, gcrootClr;
Path generation, gcrootDrv;
while (1) {
makeNames(profile, num, generation, gcrootDrv, gcrootClr);
makeNames(profile, num, generation, gcrootDrv);
if (symlink(outPath.c_str(), generation.c_str()) == 0) break;
if (errno != EEXIST)
throw SysError(format("creating symlink `%1%'") % generation);
@ -93,7 +91,6 @@ Path createGeneration(Path profile, Path outPath,
}
writeStringToFile(gcrootDrv, drvPath);
writeStringToFile(gcrootClr, clrPath);
return generation;
}
@ -108,10 +105,9 @@ static void removeFile(const Path & path)
void deleteGeneration(const Path & profile, unsigned int gen)
{
Path generation, gcrootDrv, gcrootClr;
makeNames(profile, gen, generation, gcrootDrv, gcrootClr);
Path generation, gcrootDrv;
makeNames(profile, gen, generation, gcrootDrv);
removeFile(generation);
if (pathExists(gcrootClr)) removeFile(gcrootClr);
if (pathExists(gcrootDrv)) removeFile(gcrootDrv);
}

3
src/nix-env/profiles.hh
View file

@ -28,8 +28,7 @@ typedef list<Generation> Generations;
profile, sorted by generation number. */
Generations findGenerations(Path profile, int & curGen);
Path createGeneration(Path profile, Path outPath,
Path drvPath, Path clrPath);
Path createGeneration(Path profile, Path outPath, Path drvPath);
void deleteGeneration(const Path & profile, unsigned int gen);