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#include "file-system.hh"
#include "store-api.hh"
#include "store-cast.hh"
#include "gc-store.hh"
#include "profiles.hh"
#include "shared.hh"
#include "globals.hh"
#include "legacy.hh"
#include "signals.hh"
#include "nix-collect-garbage.hh"
#include <iostream>
#include <cerrno>
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(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;
throw;
}
if (link.find("link") != std::string::npos) {
printInfo("removing old generations of profile %s", path);
if (deleteOlderThan != "") {
auto t = parseOlderThanTimeSpec(deleteOlderThan);
deleteGenerationsOlderThan(path, t, dryRun);
} else
deleteOldGenerations(path, dryRun);
}
} else if (type == DT_DIR) {
removeOldGenerations(path);
}
}
}
static int main_nix_collect_garbage(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")
options.maxFreed = std::max(getIntArg<int64_t>(*arg, arg, end, true), (int64_t) 0);
else
return false;
return true;
});
if (removeOld) {
std::set<Path> dirsToClean = {
profilesDir(), settings.nixStateDir + "/profiles", dirOf(getDefaultProfile())};
for (auto & dir : dirsToClean)
removeOldGenerations(dir);
}
// Run the actual garbage collector.
if (!dryRun) {
options.action = GCOptions::gcDeleteDead;
} else {
options.action = GCOptions::gcReturnDead;
}
auto store = openStore();
auto & gcStore = require<GcStore>(*store);
GCResults results;
PrintFreed freed(true, results);
gcStore.collectGarbage(options, results);
if (dryRun) {
// Only print results for dry run; when !dryRun, paths will be printed as they're deleted.
for (auto & i : results.paths) {
printInfo("%s", i);
}
}
return 0;
}
}
void registerNixCollectGarbage() {
LegacyCommands::add("nix-collect-garbage", main_nix_collect_garbage);
}
}
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