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gc: Use the trace helper

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This commit is contained in:
Théophane Hufschmitt 2022-04-11 10:20:36 +02:00
parent 93739ce006
commit 61c35a810b
1 changed files with 35 additions and 2 deletions
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37
src/libstore/gc.cc
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@ -295,9 +295,42 @@ void LocalStore::findRootsNoTemp(Roots & roots, bool censor)
Roots LocalStore::findRoots(bool censor)
{
Roots roots;
findRootsNoTemp(roots, censor);
findTempRoots(roots, censor);
Pipe fromHelper;
fromHelper.create();
Pid helperPid = startProcess([&]() {
if (dup2(fromHelper.writeSide.get(), STDOUT_FILENO) == -1)
throw SysError("cannot pipe standard output into log file");
if (chdir("/") == -1) throw SysError("changing into /");
auto helperProgram = settings.nixLibexecDir + "/nix/nix-find-roots";
Strings args = {std::string(baseNameOf(helperProgram))};
execv(
helperProgram.c_str(),
stringsToCharPtrs(args).data()
);
throw SysError("executing '%s'", helperProgram);
});
try {
while (true) {
auto line = readLine(fromHelper.readSide.get());
if (line.empty()) break; // TODO: Handle the broken symlinks
auto parsedLine = tokenizeString<std::vector<std::string>>(line, "\t");
if (parsedLine.size() != 2)
throw Error("Invalid result from the gc helper");
auto rawDestPath = parsedLine[0];
if (!isInStore(rawDestPath)) continue;
auto destPath = toStorePath(rawDestPath).first;
if (!isValidPath(destPath)) continue;
roots[destPath].insert(parsedLine[1]);
}
} catch (EndOfFile &) {
}
int res = helperPid.wait();
if (res != 0)
throw Error("unable to start the gc helper process");
return roots;
}