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* Call find-runtime-roots.pl from the garbage collector to prevent

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running applications etc. from being garbage collected.
This commit is contained in:
Eelco Dolstra 2006-07-20 12:17:25 +00:00
parent ebcccbd358
commit c15f544356
6 changed files with 138 additions and 16 deletions
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31
src/libstore/gc.cc
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@ -316,6 +316,31 @@ static void findRoots(const Path & path, bool recurseSymlinks,
}
static void addAdditionalRoots(PathSet & roots)
{
Path rootFinder = getEnv("NIX_ROOT_FINDER",
"/nix/libexec/nix/find-runtime-roots.pl"); /* !!! */
if (rootFinder.empty()) return;
printMsg(lvlDebug, format("executing `%1%' to find additional roots") % rootFinder);
string result = runProgram(rootFinder);
Strings paths = tokenizeString(result, "\n");
for (Strings::iterator i = paths.begin(); i != paths.end(); ++i) {
if (isInStore(*i)) {
Path path = toStorePath(*i);
if (roots.find(path) == roots.end()) {
debug(format("found additional root `%1%'") % path);
roots.insert(path);
}
}
}
}
static void dfsVisit(const PathSet & paths, const Path & path,
PathSet & visited, Paths & sorted)
{
@ -370,6 +395,12 @@ void collectGarbage(GCAction action, const PathSet & pathsToDelete,
if (!ignoreLiveness)
findRoots(rootsDir, true, roots);
/* Add additional roots returned by the program specified by the
NIX_ROOT_FINDER environment variable. This is typically used
to add running programs to the set of roots (to prevent them
from being garbage collected). */
addAdditionalRoots(roots);
if (action == gcReturnRoots) {
result = roots;
return;