forked from lix-project/lix
c404623a1d
- Greatly expand API docs
- Clean up code in misc ways
- Instead of a complicated single loop on generations, do different
operations in successive subsequent steps.
- Avoid `ref` in one place where `&` is fine
- Just return path instead of mutating an argument in `makeName`
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
#include "store-api.hh"
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#include "store-cast.hh"
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#include "gc-store.hh"
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#include "profiles.hh"
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#include "shared.hh"
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#include "globals.hh"
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#include "legacy.hh"
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#include <iostream>
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#include <cerrno>
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using namespace nix;
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std::string deleteOlderThan;
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bool dryRun = false;
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/* If `-d' was specified, remove all old generations of all profiles.
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* Of course, this makes rollbacks to before this point in time
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* impossible. */
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void removeOldGenerations(std::string dir)
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{
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if (access(dir.c_str(), R_OK) != 0) return;
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bool canWrite = access(dir.c_str(), W_OK) == 0;
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for (auto & i : readDirectory(dir)) {
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checkInterrupt();
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auto path = dir + "/" + i.name;
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auto type = i.type == DT_UNKNOWN ? getFileType(path) : i.type;
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if (type == DT_LNK && canWrite) {
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std::string link;
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try {
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link = readLink(path);
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} catch (SysError & e) {
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if (e.errNo == ENOENT) continue;
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throw;
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}
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if (link.find("link") != std::string::npos) {
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printInfo("removing old generations of profile %s", path);
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if (deleteOlderThan != "") {
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auto t = parseOlderThanTimeSpec(deleteOlderThan);
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deleteGenerationsOlderThan(path, t, dryRun);
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} else
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deleteOldGenerations(path, dryRun);
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}
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} else if (type == DT_DIR) {
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removeOldGenerations(path);
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}
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}
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}
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static int main_nix_collect_garbage(int argc, char * * argv)
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{
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{
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bool removeOld = false;
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GCOptions options;
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parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
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if (*arg == "--help")
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showManPage("nix-collect-garbage");
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else if (*arg == "--version")
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printVersion("nix-collect-garbage");
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else if (*arg == "--delete-old" || *arg == "-d") removeOld = true;
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else if (*arg == "--delete-older-than") {
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removeOld = true;
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deleteOlderThan = getArg(*arg, arg, end);
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}
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else if (*arg == "--dry-run") dryRun = true;
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else if (*arg == "--max-freed")
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options.maxFreed = std::max(getIntArg<int64_t>(*arg, arg, end, true), (int64_t) 0);
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else
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return false;
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return true;
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});
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if (removeOld) {
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std::set<Path> dirsToClean = {
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profilesDir(), settings.nixStateDir + "/profiles", dirOf(getDefaultProfile())};
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for (auto & dir : dirsToClean)
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removeOldGenerations(dir);
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}
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// Run the actual garbage collector.
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if (!dryRun) {
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auto store = openStore();
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auto & gcStore = require<GcStore>(*store);
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options.action = GCOptions::gcDeleteDead;
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GCResults results;
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PrintFreed freed(true, results);
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gcStore.collectGarbage(options, results);
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}
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return 0;
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}
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}
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static RegisterLegacyCommand r_nix_collect_garbage("nix-collect-garbage", main_nix_collect_garbage);
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