mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-11 00:36:20 +02:00
8824d60fe5
(Linux) machines no longer maintain the atime because it's too expensive, and on the machines where --use-atime is useful (like the buildfarm), reading the atimes on the entire Nix store takes way too much time to make it practical.
662 lines
21 KiB
C++
662 lines
21 KiB
C++
#include "globals.hh"
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#include "misc.hh"
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#include "pathlocks.hh"
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#include "local-store.hh"
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#include <boost/shared_ptr.hpp>
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#include <functional>
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#include <queue>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef __CYGWIN__
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#include <windows.h>
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#include <sys/cygwin.h>
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#endif
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namespace nix {
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static string gcLockName = "gc.lock";
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static string tempRootsDir = "temproots";
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static string gcRootsDir = "gcroots";
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static const int defaultGcLevel = 1000;
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/* Acquire the global GC lock. This is used to prevent new Nix
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processes from starting after the temporary root files have been
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read. To be precise: when they try to create a new temporary root
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file, they will block until the garbage collector has finished /
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yielded the GC lock. */
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static int openGCLock(LockType lockType)
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{
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Path fnGCLock = (format("%1%/%2%")
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% nixStateDir % gcLockName).str();
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debug(format("acquiring global GC lock `%1%'") % fnGCLock);
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AutoCloseFD fdGCLock = open(fnGCLock.c_str(), O_RDWR | O_CREAT, 0600);
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if (fdGCLock == -1)
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throw SysError(format("opening global GC lock `%1%'") % fnGCLock);
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if (!lockFile(fdGCLock, lockType, false)) {
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printMsg(lvlError, format("waiting for the big garbage collector lock..."));
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lockFile(fdGCLock, lockType, true);
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}
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/* !!! Restrict read permission on the GC root. Otherwise any
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process that can open the file for reading can DoS the
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collector. */
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return fdGCLock.borrow();
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}
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void createSymlink(const Path & link, const Path & target, bool careful)
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{
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/* Create directories up to `gcRoot'. */
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createDirs(dirOf(link));
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/* !!! shouldn't removing and creating the symlink be atomic? */
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/* Remove the old symlink. */
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if (pathExists(link)) {
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if (careful && (!isLink(link) || !isInStore(readLink(link))))
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throw Error(format("cannot create symlink `%1%'; already exists") % link);
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unlink(link.c_str());
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}
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/* And create the new one. */
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if (symlink(target.c_str(), link.c_str()) == -1)
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throw SysError(format("symlinking `%1%' to `%2%'")
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% link % target);
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}
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void LocalStore::syncWithGC()
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{
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AutoCloseFD fdGCLock = openGCLock(ltRead);
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}
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void LocalStore::addIndirectRoot(const Path & path)
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{
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string hash = printHash32(hashString(htSHA1, path));
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Path realRoot = canonPath((format("%1%/%2%/auto/%3%")
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% nixStateDir % gcRootsDir % hash).str());
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createSymlink(realRoot, path, false);
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}
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Path addPermRoot(const Path & _storePath, const Path & _gcRoot,
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bool indirect, bool allowOutsideRootsDir)
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{
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Path storePath(canonPath(_storePath));
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Path gcRoot(canonPath(_gcRoot));
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assertStorePath(storePath);
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if (isInStore(gcRoot))
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throw Error(format(
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"creating a garbage collector root (%1%) in the Nix store is forbidden "
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"(are you running nix-build inside the store?)") % gcRoot);
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if (indirect) {
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createSymlink(gcRoot, storePath, true);
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store->addIndirectRoot(gcRoot);
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}
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else {
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if (!allowOutsideRootsDir) {
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Path rootsDir = canonPath((format("%1%/%2%") % nixStateDir % gcRootsDir).str());
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if (string(gcRoot, 0, rootsDir.size() + 1) != rootsDir + "/")
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throw Error(format(
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"path `%1%' is not a valid garbage collector root; "
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"it's not in the directory `%2%'")
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% gcRoot % rootsDir);
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}
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createSymlink(gcRoot, storePath, false);
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}
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/* Check that the root can be found by the garbage collector.
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!!! This can be very slow on machines that have many roots.
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Instead of reading all the roots, it would be more efficient to
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check if the root is in a directory in or linked from the
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gcroots directory. */
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if (queryBoolSetting("gc-check-reachability", true)) {
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Roots roots = store->findRoots();
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if (roots.find(gcRoot) == roots.end())
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printMsg(lvlError,
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format(
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"warning: `%1%' is not in a directory where the garbage collector looks for roots; "
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"therefore, `%2%' might be removed by the garbage collector")
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% gcRoot % storePath);
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}
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/* Grab the global GC root, causing us to block while a GC is in
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progress. This prevents the set of permanent roots from
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increasing while a GC is in progress. */
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store->syncWithGC();
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return gcRoot;
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}
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/* The file to which we write our temporary roots. */
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static Path fnTempRoots;
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static AutoCloseFD fdTempRoots;
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void LocalStore::addTempRoot(const Path & path)
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{
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/* Create the temporary roots file for this process. */
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if (fdTempRoots == -1) {
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while (1) {
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Path dir = (format("%1%/%2%") % nixStateDir % tempRootsDir).str();
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createDirs(dir);
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fnTempRoots = (format("%1%/%2%")
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% dir % getpid()).str();
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AutoCloseFD fdGCLock = openGCLock(ltRead);
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if (pathExists(fnTempRoots))
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/* It *must* be stale, since there can be no two
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processes with the same pid. */
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deletePath(fnTempRoots);
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fdTempRoots = openLockFile(fnTempRoots, true);
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fdGCLock.close();
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/* Note that on Cygwin a lot of the following complexity
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is unnecessary, since we cannot delete open lock
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files. If we have the lock file open, then it's valid;
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if we can delete it, then it wasn't in use any more.
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Also note that on Cygwin we cannot "upgrade" a lock
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from a read lock to a write lock. */
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#ifndef __CYGWIN__
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debug(format("acquiring read lock on `%1%'") % fnTempRoots);
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lockFile(fdTempRoots, ltRead, true);
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/* Check whether the garbage collector didn't get in our
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way. */
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struct stat st;
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if (fstat(fdTempRoots, &st) == -1)
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throw SysError(format("statting `%1%'") % fnTempRoots);
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if (st.st_size == 0) break;
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/* The garbage collector deleted this file before we could
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get a lock. (It won't delete the file after we get a
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lock.) Try again. */
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#else
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break;
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#endif
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}
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}
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/* Upgrade the lock to a write lock. This will cause us to block
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if the garbage collector is holding our lock. */
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debug(format("acquiring write lock on `%1%'") % fnTempRoots);
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lockFile(fdTempRoots, ltWrite, true);
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string s = path + '\0';
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writeFull(fdTempRoots, (const unsigned char *) s.c_str(), s.size());
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#ifndef __CYGWIN__
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/* Downgrade to a read lock. */
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debug(format("downgrading to read lock on `%1%'") % fnTempRoots);
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lockFile(fdTempRoots, ltRead, true);
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#else
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debug(format("releasing write lock on `%1%'") % fnTempRoots);
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lockFile(fdTempRoots, ltNone, true);
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#endif
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}
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void removeTempRoots()
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{
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if (fdTempRoots != -1) {
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fdTempRoots.close();
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unlink(fnTempRoots.c_str());
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}
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}
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typedef boost::shared_ptr<AutoCloseFD> FDPtr;
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typedef list<FDPtr> FDs;
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static void readTempRoots(PathSet & tempRoots, FDs & fds)
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{
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/* Read the `temproots' directory for per-process temporary root
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files. */
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Strings tempRootFiles = readDirectory(
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(format("%1%/%2%") % nixStateDir % tempRootsDir).str());
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foreach (Strings::iterator, i, tempRootFiles) {
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Path path = (format("%1%/%2%/%3%") % nixStateDir % tempRootsDir % *i).str();
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debug(format("reading temporary root file `%1%'") % path);
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#ifdef __CYGWIN__
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/* On Cygwin we just try to delete the lock file. */
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char win32Path[MAX_PATH];
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cygwin_conv_to_full_win32_path(path.c_str(), win32Path);
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if (DeleteFile(win32Path)) {
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printMsg(lvlError, format("removed stale temporary roots file `%1%'")
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% path);
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continue;
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} else
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debug(format("delete of `%1%' failed: %2%") % path % GetLastError());
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#endif
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FDPtr fd(new AutoCloseFD(open(path.c_str(), O_RDWR, 0666)));
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if (*fd == -1) {
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/* It's okay if the file has disappeared. */
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if (errno == ENOENT) continue;
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throw SysError(format("opening temporary roots file `%1%'") % path);
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}
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/* This should work, but doesn't, for some reason. */
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//FDPtr fd(new AutoCloseFD(openLockFile(path, false)));
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//if (*fd == -1) continue;
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#ifndef __CYGWIN__
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/* Try to acquire a write lock without blocking. This can
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only succeed if the owning process has died. In that case
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we don't care about its temporary roots. */
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if (lockFile(*fd, ltWrite, false)) {
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printMsg(lvlError, format("removing stale temporary roots file `%1%'")
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% path);
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unlink(path.c_str());
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writeFull(*fd, (const unsigned char *) "d", 1);
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continue;
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}
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#endif
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/* Acquire a read lock. This will prevent the owning process
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from upgrading to a write lock, therefore it will block in
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addTempRoot(). */
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debug(format("waiting for read lock on `%1%'") % path);
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lockFile(*fd, ltRead, true);
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/* Read the entire file. */
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string contents = readFile(*fd);
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/* Extract the roots. */
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string::size_type pos = 0, end;
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while ((end = contents.find((char) 0, pos)) != string::npos) {
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Path root(contents, pos, end - pos);
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debug(format("got temporary root `%1%'") % root);
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assertStorePath(root);
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tempRoots.insert(root);
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pos = end + 1;
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}
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fds.push_back(fd); /* keep open */
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}
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}
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static void findRoots(const Path & path, bool recurseSymlinks,
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bool deleteStale, Roots & roots)
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{
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try {
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struct stat st;
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if (lstat(path.c_str(), &st) == -1)
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throw SysError(format("statting `%1%'") % path);
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printMsg(lvlVomit, format("looking at `%1%'") % path);
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if (S_ISDIR(st.st_mode)) {
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Strings names = readDirectory(path);
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foreach (Strings::iterator, i, names)
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findRoots(path + "/" + *i, recurseSymlinks, deleteStale, roots);
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}
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else if (S_ISLNK(st.st_mode)) {
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Path target = absPath(readLink(path), dirOf(path));
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if (isInStore(target)) {
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debug(format("found root `%1%' in `%2%'")
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% target % path);
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Path storePath = toStorePath(target);
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if (store->isValidPath(storePath))
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roots[path] = storePath;
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else
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printMsg(lvlInfo, format("skipping invalid root from `%1%' to `%2%'")
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% path % storePath);
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}
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else if (recurseSymlinks) {
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if (pathExists(target))
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findRoots(target, false, deleteStale, roots);
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else if (deleteStale) {
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printMsg(lvlInfo, format("removing stale link from `%1%' to `%2%'") % path % target);
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/* Note that we only delete when recursing, i.e.,
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when we are still in the `gcroots' tree. We
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never delete stuff outside that tree. */
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unlink(path.c_str());
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}
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}
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}
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}
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catch (SysError & e) {
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/* We only ignore permanent failures. */
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if (e.errNo == EACCES || e.errNo == ENOENT || e.errNo == ENOTDIR)
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printMsg(lvlInfo, format("cannot read potential root `%1%'") % path);
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else
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throw;
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}
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}
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static Roots findRoots(bool deleteStale)
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{
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Roots roots;
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Path rootsDir = canonPath((format("%1%/%2%") % nixStateDir % gcRootsDir).str());
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findRoots(rootsDir, true, deleteStale, roots);
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return roots;
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}
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Roots LocalStore::findRoots()
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{
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return nix::findRoots(false);
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}
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static void addAdditionalRoots(PathSet & roots)
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{
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Path rootFinder = getEnv("NIX_ROOT_FINDER",
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nixLibexecDir + "/nix/find-runtime-roots.pl");
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if (rootFinder.empty()) return;
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debug(format("executing `%1%' to find additional roots") % rootFinder);
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string result = runProgram(rootFinder);
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Strings paths = tokenizeString(result, "\n");
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foreach (Strings::iterator, i, paths) {
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if (isInStore(*i)) {
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Path path = toStorePath(*i);
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if (roots.find(path) == roots.end() && store->isValidPath(path)) {
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debug(format("found additional root `%1%'") % path);
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roots.insert(path);
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}
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}
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}
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}
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static void dfsVisit(const PathSet & paths, const Path & path,
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PathSet & visited, Paths & sorted)
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{
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if (visited.find(path) != visited.end()) return;
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visited.insert(path);
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PathSet references;
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if (store->isValidPath(path))
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store->queryReferences(path, references);
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foreach (PathSet::iterator, i, references)
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/* Don't traverse into paths that don't exist. That can
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happen due to substitutes for non-existent paths. */
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if (*i != path && paths.find(*i) != paths.end())
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dfsVisit(paths, *i, visited, sorted);
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sorted.push_front(path);
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}
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Paths topoSortPaths(const PathSet & paths)
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{
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Paths sorted;
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PathSet visited;
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foreach (PathSet::const_iterator, i, paths)
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dfsVisit(paths, *i, visited, sorted);
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return sorted;
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}
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struct GCLimitReached { };
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void LocalStore::gcPath(const GCOptions & options, GCResults & results,
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const Path & path)
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{
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results.paths.insert(path);
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if (!pathExists(path)) return;
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/* Okay, it's safe to delete. */
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unsigned long long bytesFreed, blocksFreed;
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deleteFromStore(path, bytesFreed, blocksFreed);
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results.bytesFreed += bytesFreed;
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results.blocksFreed += blocksFreed;
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if (options.maxFreed && results.bytesFreed > options.maxFreed) {
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printMsg(lvlInfo, format("deleted more than %1% bytes; stopping") % options.maxFreed);
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throw GCLimitReached();
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}
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if (options.maxLinks) {
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struct stat st;
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if (stat(nixStore.c_str(), &st) == -1)
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throw SysError(format("statting `%1%'") % nixStore);
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if (st.st_nlink < options.maxLinks) {
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printMsg(lvlInfo, format("link count on the store has dropped below %1%; stopping") % options.maxLinks);
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throw GCLimitReached();
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}
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}
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}
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void LocalStore::gcPathRecursive(const GCOptions & options,
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GCResults & results, PathSet & done, const Path & path)
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{
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if (done.find(path) != done.end()) return;
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done.insert(path);
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startNest(nest, lvlDebug, format("looking at `%1%'") % path);
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/* Delete all the referrers first. They must be garbage too,
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since if they were live, then the current path would also be
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live. Note that deleteFromStore() below still makes sure that
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the referrer set has become empty, just in case. (However that
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doesn't guard against deleting top-level paths that are only
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reachable from GC roots.) */
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PathSet referrers;
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if (isValidPath(path))
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queryReferrers(path, referrers);
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foreach (PathSet::iterator, i, referrers)
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if (*i != path) gcPathRecursive(options, results, done, *i);
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printMsg(lvlInfo, format("deleting `%1%'") % path);
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gcPath(options, results, path);
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}
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static bool isLive(const Path & path, const PathSet & livePaths,
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const PathSet & tempRoots, const PathSet & tempRootsClosed)
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{
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if (livePaths.find(path) != livePaths.end() ||
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tempRootsClosed.find(path) != tempRootsClosed.end()) return true;
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/* A lock file belonging to a path that we're building right
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now isn't garbage. */
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if (hasSuffix(path, ".lock") && tempRoots.find(string(path, 0, path.size() - 5)) != tempRoots.end())
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return true;
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/* Don't delete .chroot directories for derivations that are
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currently being built. */
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if (hasSuffix(path, ".chroot") && tempRoots.find(string(path, 0, path.size() - 7)) != tempRoots.end())
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return true;
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return false;
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}
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void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
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{
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bool gcKeepOutputs =
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queryBoolSetting("gc-keep-outputs", false);
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bool gcKeepDerivations =
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queryBoolSetting("gc-keep-derivations", true);
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int gcKeepOutputsThreshold =
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queryIntSetting ("gc-keep-outputs-threshold", defaultGcLevel);
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/* Acquire the global GC root. This prevents
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a) New roots from being added.
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b) Processes from creating new temporary root files. */
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AutoCloseFD fdGCLock = openGCLock(ltWrite);
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/* Find the roots. Since we've grabbed the GC lock, the set of
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permanent roots cannot increase now. */
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printMsg(lvlError, format("finding garbage collector roots..."));
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Roots rootMap = options.ignoreLiveness ? Roots() : nix::findRoots(true);
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PathSet roots;
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foreach (Roots::iterator, i, rootMap) roots.insert(i->second);
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/* Add additional roots returned by the program specified by the
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NIX_ROOT_FINDER environment variable. This is typically used
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to add running programs to the set of roots (to prevent them
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from being garbage collected). */
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if (!options.ignoreLiveness)
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addAdditionalRoots(roots);
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if (options.action == GCOptions::gcReturnRoots) {
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results.paths = roots;
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return;
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}
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/* Determine the live paths which is just the closure of the
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roots under the `references' relation. */
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printMsg(lvlError, format("computing live paths..."));
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PathSet livePaths;
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foreach (PathSet::const_iterator, i, roots)
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computeFSClosure(canonPath(*i), livePaths);
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if (gcKeepDerivations) {
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foreach (PathSet::iterator, i, livePaths) {
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/* Note that the deriver need not be valid (e.g., if we
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previously ran the collector with `gcKeepDerivations'
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turned off). */
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Path deriver = queryDeriver(*i);
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if (deriver != "" && isValidPath(deriver))
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computeFSClosure(deriver, livePaths);
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}
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}
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if (gcKeepOutputs) {
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/* Hmz, identical to storePathRequisites in nix-store. */
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foreach (PathSet::iterator, i, livePaths)
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if (isDerivation(*i)) {
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Derivation drv = derivationFromPath(*i);
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string gcLevelStr = drv.env["__gcLevel"];
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int gcLevel;
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if (!string2Int(gcLevelStr, gcLevel))
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gcLevel = defaultGcLevel;
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if (gcLevel >= gcKeepOutputsThreshold)
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foreach (DerivationOutputs::iterator, j, drv.outputs)
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if (isValidPath(j->second.path))
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computeFSClosure(j->second.path, livePaths);
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}
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}
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if (options.action == GCOptions::gcReturnLive) {
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results.paths = livePaths;
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return;
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}
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/* Read the temporary roots. This acquires read locks on all
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per-process temporary root files. So after this point no paths
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can be added to the set of temporary roots. */
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PathSet tempRoots;
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FDs fds;
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readTempRoots(tempRoots, fds);
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/* Close the temporary roots. Note that we *cannot* do this in
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readTempRoots(), because there we may not have all locks yet,
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meaning that an invalid path can become valid (and thus add to
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the references graph) after we have added it to the closure
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(and computeFSClosure() assumes that the presence of a path
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means that it has already been closed). */
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PathSet tempRootsClosed;
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foreach (PathSet::iterator, i, tempRoots)
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if (isValidPath(*i))
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computeFSClosure(*i, tempRootsClosed);
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else
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tempRootsClosed.insert(*i);
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/* After this point the set of roots or temporary roots cannot
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increase, since we hold locks on everything. So everything
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that is not currently in in `livePaths' or `tempRootsClosed'
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can be deleted. */
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/* Read the Nix store directory to find all currently existing
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paths and filter out all live paths. */
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printMsg(lvlError, format("reading the Nix store..."));
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PathSet storePaths;
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if (options.action != GCOptions::gcDeleteSpecific) {
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Paths entries = readDirectory(nixStore);
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foreach (Paths::iterator, i, entries) {
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Path path = canonPath(nixStore + "/" + *i);
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if (!isLive(path, livePaths, tempRoots, tempRootsClosed)) storePaths.insert(path);
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}
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}
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else {
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foreach (PathSet::iterator, i, options.pathsToDelete) {
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assertStorePath(*i);
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storePaths.insert(*i);
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if (isLive(*i, livePaths, tempRoots, tempRootsClosed))
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throw Error(format("cannot delete path `%1%' since it is still alive") % *i);
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}
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}
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if (options.action == GCOptions::gcReturnDead) {
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results.paths.insert(storePaths.begin(), storePaths.end());
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return;
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}
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/* Delete all dead store paths (or until one of the stop
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conditions is reached), respecting the partial ordering
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determined by the references graph. */
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PathSet done;
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try {
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printMsg(lvlError, format("deleting garbage..."));
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foreach (PathSet::iterator, i, storePaths)
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gcPathRecursive(options, results, done, *i);
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} catch (GCLimitReached & e) {
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}
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}
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}
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