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* Fix and simplify the garbage collector (it's still not concurrent,

Browse source 
though).  In particular it's now much easier to register a GC root.
  Just place a symlink to whatever store path it is that you want to
  keep in /nix/var/nix/gcroots.
This commit is contained in:
Eelco Dolstra 2005-01-27 15:21:29 +00:00
parent 59682e6188
commit c505702265
10 changed files with 124 additions and 109 deletions
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55
src/nix-store/main.cc
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@ -274,61 +274,32 @@ static void opIsValid(Strings opFlags, Strings opArgs)
static void opGC(Strings opFlags, Strings opArgs)
{
#if 0
GCAction action;
/* Do what? */
enum { soPrintLive, soPrintDead, soDelete } subOp;
time_t minAge = 0;
for (Strings::iterator i = opFlags.begin();
i != opFlags.end(); ++i)
if (*i == "--print-live") subOp = soPrintLive;
else if (*i == "--print-dead") subOp = soPrintDead;
else if (*i == "--delete") subOp = soDelete;
else if (*i == "--min-age") {
int n;
if (opArgs.size() == 0 || !string2Int(opArgs.front(), n))
throw UsageError("`--min-age' requires an integer argument");
minAge = n;
}
if (*i == "--print-live") action = gcReturnLive;
else if (*i == "--print-dead") action = gcReturnDead;
else if (*i == "--delete") action = gcDeleteDead;
else throw UsageError(format("bad sub-operation `%1%' in GC") % *i);
Paths roots;
/* Read the roots. */
PathSet roots;
while (1) {
Path root;
getline(cin, root);
if (cin.eof()) break;
roots.push_back(root);
roots.insert(root);
}
PathSet live = findLivePaths(roots);
PathSet result;
collectGarbage(roots, action, result);
if (subOp == soPrintLive) {
for (PathSet::iterator i = live.begin(); i != live.end(); ++i)
if (action != gcDeleteDead) {
for (PathSet::iterator i = result.begin(); i != result.end(); ++i)
cout << *i << endl;
return;
}
PathSet dead = findDeadPaths(live, minAge * 3600);
if (subOp == soPrintDead) {
for (PathSet::iterator i = dead.begin(); i != dead.end(); ++i)
cout << *i << endl;
return;
}
if (subOp == soDelete) {
/* !!! What happens if the garbage collector run is aborted
halfway through? In particular, dead paths can always
become live again (through re-instantiation), and might
then refer to deleted paths. => check instantiation
invariants */
for (PathSet::iterator i = dead.begin(); i != dead.end(); ++i) {
printMsg(lvlInfo, format("deleting `%1%'") % *i);
deleteFromStore(*i);
}
}
#endif
}