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#include "hash.hh"
#include "shared.hh"
#include "globals.hh"
#include <iostream>
using namespace nix;
std::string gen = "old";
bool dryRun = false;
void runProgramSimple(Path program, const Strings & args)
{
checkInterrupt();
/* Fork. */
Pid pid = startProcess([&]() {
Strings args_(args);
args_.push_front(program);
auto cargs = stringsToCharPtrs(args_);
execv(program.c_str(), (char * *) &cargs[0]);
throw SysError(format("executing ‘%1%’") % program);
});
pid.wait(true);
}
/* 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)
{
for (auto & i : readDirectory(dir)) {
checkInterrupt();
auto path = dir + "/" + i.name;
auto type = getFileType(path);
if (type == DT_LNK) {
auto link = readLink(path);
if (link.find("link") != string::npos) {
printMsg(lvlInfo, format("removing old generations of profile %1%") % path);
auto args = Strings{"-p", path, "--delete-generations", gen};
if (dryRun) {
args.push_back("--dry-run");
}
runProgramSimple(settings.nixBinDir + "/nix-env", args);
}
} else if (type == DT_DIR) {
removeOldGenerations(path);
}
}
}
int main(int argc, char * * argv)
{
bool removeOld = false;
Strings extraArgs;
return handleExceptions(argv[0], [&]() {
initNix();
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;
gen = getArg(*arg, arg, end);
}
else if (*arg == "--dry-run") dryRun = true;
else
extraArgs.push_back(*arg);
return true;
});
auto profilesDir = settings.nixStateDir + "/profiles";
if (removeOld) removeOldGenerations(profilesDir);
// Run the actual garbage collector.
if (!dryRun) runProgramSimple(settings.nixBinDir + "/nix-store", Strings{"--gc"});
});
}
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