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#include <cerrno>
#include <iostream>
#include <glog/logging.h>
#include "libmain/shared.hh"
#include "libstore/globals.hh"
#include "libstore/profiles.hh"
#include "libstore/store-api.hh"
#include "nix/legacy.hh"
using namespace nix;
std::string deleteOlderThan;
bool dryRun = false;
/* If `-d' was specified, remove all old generations of all profiles.
* Of course, this makes rollbacks to before this point in time
* impossible. */
void removeOldGenerations(const std::string& dir) {
if (access(dir.c_str(), R_OK) != 0) {
return;
}
bool canWrite = access(dir.c_str(), W_OK) == 0;
for (auto& i : readDirectory(dir)) {
checkInterrupt();
auto path = dir + "/" + i.name;
auto type = i.type == DT_UNKNOWN ? getFileType(path) : i.type;
if (type == DT_LNK && canWrite) {
std::string link;
try {
link = readLink(path);
} catch (SysError& e) {
if (e.errNo == ENOENT) {
continue;
}
}
if (link.find("link") != std::string::npos) {
LOG(INFO) << "removing old generations of profile " << path;
if (!deleteOlderThan.empty()) {
deleteGenerationsOlderThan(path, deleteOlderThan, dryRun);
} else {
deleteOldGenerations(path, dryRun);
}
}
} else if (type == DT_DIR) {
removeOldGenerations(path);
}
}
}
static int _main(int argc, char** argv) {
{
bool removeOld = false;
GCOptions options;
parseCmdLine(argc, argv,
[&](Strings::iterator& arg, const Strings::iterator& end) {
if (*arg == "--help") {
showManPage("nix-collect-garbage");
} else if (*arg == "--version") {
printVersion("nix-collect-garbage");
} else if (*arg == "--delete-old" || *arg == "-d") {
removeOld = true;
} else if (*arg == "--delete-older-than") {
removeOld = true;
deleteOlderThan = getArg(*arg, arg, end);
} else if (*arg == "--dry-run") {
dryRun = true;
} else if (*arg == "--max-freed") {
auto maxFreed = getIntArg<long long>(*arg, arg, end, true);
options.maxFreed = maxFreed >= 0 ? maxFreed : 0;
} else {
return false;
}
return true;
});
auto profilesDir = settings.nixStateDir + "/profiles";
if (removeOld) {
removeOldGenerations(profilesDir);
}
// Run the actual garbage collector.
if (!dryRun) {
auto store = openStore();
options.action = GCOptions::gcDeleteDead;
GCResults results;
PrintFreed freed(true, results);
store->collectGarbage(options, results);
}
return 0;
}
}
static RegisterLegacyCommand s1("nix-collect-garbage", _main);
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