forked from lix-project/lix
1331 lines
42 KiB
C++
1331 lines
42 KiB
C++
#include "config.h"
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#include "local-store.hh"
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#include "globals.hh"
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#include "archive.hh"
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#include "pathlocks.hh"
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#include "worker-protocol.hh"
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#include "derivations.hh"
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#include "nar-info.hh"
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#include <iostream>
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#include <algorithm>
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#include <cstring>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <utime.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <time.h>
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#include <grp.h>
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#if __linux__
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#include <sched.h>
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#include <sys/statvfs.h>
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#include <sys/mount.h>
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#include <sys/ioctl.h>
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#endif
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#include <sqlite3.h>
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namespace nix {
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void checkStoreNotSymlink()
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{
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if (getEnv("NIX_IGNORE_SYMLINK_STORE") == "1") return;
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Path path = settings.nixStore;
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struct stat st;
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while (path != "/") {
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if (lstat(path.c_str(), &st))
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throw SysError(format("getting status of ‘%1%’") % path);
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if (S_ISLNK(st.st_mode))
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throw Error(format(
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"the path ‘%1%’ is a symlink; "
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"this is not allowed for the Nix store and its parent directories")
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% path);
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path = dirOf(path);
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}
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}
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LocalStore::LocalStore()
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: linksDir(settings.nixStore + "/.links")
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, reservedPath(settings.nixDBPath + "/reserved")
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, schemaPath(settings.nixDBPath + "/schema")
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, requireSigs(settings.get("signed-binary-caches", std::string("")) != "") // FIXME: rename option
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, publicKeys(getDefaultPublicKeys())
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{
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auto state(_state.lock());
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if (settings.readOnlyMode) {
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openDB(*state, false);
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return;
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}
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/* Create missing state directories if they don't already exist. */
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createDirs(settings.nixStore);
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makeStoreWritable();
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createDirs(linksDir);
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Path profilesDir = settings.nixStateDir + "/profiles";
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createDirs(profilesDir);
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createDirs(settings.nixStateDir + "/temproots");
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createDirs(settings.nixDBPath);
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Path gcRootsDir = settings.nixStateDir + "/gcroots";
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if (!pathExists(gcRootsDir)) {
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createDirs(gcRootsDir);
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createSymlink(profilesDir, gcRootsDir + "/profiles");
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}
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/* Optionally, create directories and set permissions for a
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multi-user install. */
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if (getuid() == 0 && settings.buildUsersGroup != "") {
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Path perUserDir = profilesDir + "/per-user";
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createDirs(perUserDir);
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if (chmod(perUserDir.c_str(), 01777) == -1)
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throw SysError(format("could not set permissions on ‘%1%’ to 1777") % perUserDir);
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mode_t perm = 01775;
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struct group * gr = getgrnam(settings.buildUsersGroup.c_str());
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if (!gr)
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printMsg(lvlError, format("warning: the group ‘%1%’ specified in ‘build-users-group’ does not exist")
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% settings.buildUsersGroup);
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else {
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struct stat st;
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if (stat(settings.nixStore.c_str(), &st))
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throw SysError(format("getting attributes of path ‘%1%’") % settings.nixStore);
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if (st.st_uid != 0 || st.st_gid != gr->gr_gid || (st.st_mode & ~S_IFMT) != perm) {
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if (chown(settings.nixStore.c_str(), 0, gr->gr_gid) == -1)
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throw SysError(format("changing ownership of path ‘%1%’") % settings.nixStore);
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if (chmod(settings.nixStore.c_str(), perm) == -1)
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throw SysError(format("changing permissions on path ‘%1%’") % settings.nixStore);
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}
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}
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}
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checkStoreNotSymlink();
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/* We can't open a SQLite database if the disk is full. Since
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this prevents the garbage collector from running when it's most
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needed, we reserve some dummy space that we can free just
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before doing a garbage collection. */
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try {
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struct stat st;
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if (stat(reservedPath.c_str(), &st) == -1 ||
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st.st_size != settings.reservedSize)
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{
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AutoCloseFD fd = open(reservedPath.c_str(), O_WRONLY | O_CREAT, 0600);
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int res = -1;
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#if HAVE_POSIX_FALLOCATE
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res = posix_fallocate(fd, 0, settings.reservedSize);
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#endif
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if (res == -1) {
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writeFull(fd, string(settings.reservedSize, 'X'));
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ftruncate(fd, settings.reservedSize);
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}
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}
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} catch (SysError & e) { /* don't care about errors */
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}
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/* Acquire the big fat lock in shared mode to make sure that no
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schema upgrade is in progress. */
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try {
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Path globalLockPath = settings.nixDBPath + "/big-lock";
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globalLock = openLockFile(globalLockPath.c_str(), true);
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} catch (SysError & e) {
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if (e.errNo != EACCES) throw;
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settings.readOnlyMode = true;
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openDB(*state, false);
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return;
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}
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if (!lockFile(globalLock, ltRead, false)) {
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printMsg(lvlError, "waiting for the big Nix store lock...");
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lockFile(globalLock, ltRead, true);
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}
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/* Check the current database schema and if necessary do an
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upgrade. */
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int curSchema = getSchema();
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if (curSchema > nixSchemaVersion)
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throw Error(format("current Nix store schema is version %1%, but I only support %2%")
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% curSchema % nixSchemaVersion);
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else if (curSchema == 0) { /* new store */
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curSchema = nixSchemaVersion;
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openDB(*state, true);
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writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str());
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}
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else if (curSchema < nixSchemaVersion) {
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if (curSchema < 5)
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throw Error(
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"Your Nix store has a database in Berkeley DB format,\n"
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"which is no longer supported. To convert to the new format,\n"
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"please upgrade Nix to version 0.12 first.");
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if (curSchema < 6)
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throw Error(
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"Your Nix store has a database in flat file format,\n"
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"which is no longer supported. To convert to the new format,\n"
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"please upgrade Nix to version 1.11 first.");
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if (!lockFile(globalLock, ltWrite, false)) {
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printMsg(lvlError, "waiting for exclusive access to the Nix store...");
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lockFile(globalLock, ltWrite, true);
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}
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/* Get the schema version again, because another process may
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have performed the upgrade already. */
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curSchema = getSchema();
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if (curSchema < 7) { upgradeStore7(); }
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openDB(*state, false);
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if (curSchema < 8) {
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SQLiteTxn txn(state->db);
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if (sqlite3_exec(state->db, "alter table ValidPaths add column ultimate integer", 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(state->db, "upgrading database schema");
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if (sqlite3_exec(state->db, "alter table ValidPaths add column sigs text", 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(state->db, "upgrading database schema");
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txn.commit();
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}
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if (curSchema < 9) {
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SQLiteTxn txn(state->db);
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if (sqlite3_exec(state->db, "drop table FailedPaths", 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(state->db, "upgrading database schema");
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txn.commit();
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}
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writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str());
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lockFile(globalLock, ltRead, true);
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}
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else openDB(*state, false);
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}
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LocalStore::~LocalStore()
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{
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auto state(_state.lock());
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try {
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if (state->fdTempRoots != -1) {
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state->fdTempRoots.close();
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unlink(state->fnTempRoots.c_str());
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}
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} catch (...) {
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ignoreException();
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}
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}
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std::string LocalStore::getUri()
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{
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return "local";
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}
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int LocalStore::getSchema()
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{
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int curSchema = 0;
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if (pathExists(schemaPath)) {
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string s = readFile(schemaPath);
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if (!string2Int(s, curSchema))
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throw Error(format("‘%1%’ is corrupt") % schemaPath);
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}
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return curSchema;
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}
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bool LocalStore::haveWriteAccess()
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{
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return access(settings.nixDBPath.c_str(), R_OK | W_OK) == 0;
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}
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void LocalStore::openDB(State & state, bool create)
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{
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if (!haveWriteAccess())
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throw SysError(format("Nix database directory ‘%1%’ is not writable") % settings.nixDBPath);
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/* Open the Nix database. */
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string dbPath = settings.nixDBPath + "/db.sqlite";
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auto & db(state.db);
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if (sqlite3_open_v2(dbPath.c_str(), &db.db,
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SQLITE_OPEN_READWRITE | (create ? SQLITE_OPEN_CREATE : 0), 0) != SQLITE_OK)
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throw Error(format("cannot open Nix database ‘%1%’") % dbPath);
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if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK)
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throwSQLiteError(db, "setting timeout");
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if (sqlite3_exec(db, "pragma foreign_keys = 1;", 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(db, "enabling foreign keys");
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/* !!! check whether sqlite has been built with foreign key
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support */
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/* Whether SQLite should fsync(). "Normal" synchronous mode
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should be safe enough. If the user asks for it, don't sync at
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all. This can cause database corruption if the system
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crashes. */
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string syncMode = settings.fsyncMetadata ? "normal" : "off";
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if (sqlite3_exec(db, ("pragma synchronous = " + syncMode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(db, "setting synchronous mode");
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/* Set the SQLite journal mode. WAL mode is fastest, so it's the
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default. */
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string mode = settings.useSQLiteWAL ? "wal" : "truncate";
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string prevMode;
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{
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SQLiteStmt stmt;
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stmt.create(db, "pragma main.journal_mode;");
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if (sqlite3_step(stmt) != SQLITE_ROW)
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throwSQLiteError(db, "querying journal mode");
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prevMode = string((const char *) sqlite3_column_text(stmt, 0));
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}
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if (prevMode != mode &&
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sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(db, "setting journal mode");
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/* Increase the auto-checkpoint interval to 40000 pages. This
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seems enough to ensure that instantiating the NixOS system
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derivation is done in a single fsync(). */
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if (mode == "wal" && sqlite3_exec(db, "pragma wal_autocheckpoint = 40000;", 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(db, "setting autocheckpoint interval");
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/* Initialise the database schema, if necessary. */
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if (create) {
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const char * schema =
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#include "schema.sql.hh"
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;
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if (sqlite3_exec(db, (const char *) schema, 0, 0, 0) != SQLITE_OK)
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throwSQLiteError(db, "initialising database schema");
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}
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/* Prepare SQL statements. */
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state.stmtRegisterValidPath.create(db,
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"insert into ValidPaths (path, hash, registrationTime, deriver, narSize, ultimate, sigs) values (?, ?, ?, ?, ?, ?, ?);");
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state.stmtUpdatePathInfo.create(db,
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"update ValidPaths set narSize = ?, hash = ?, ultimate = ?, sigs = ? where path = ?;");
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state.stmtAddReference.create(db,
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"insert or replace into Refs (referrer, reference) values (?, ?);");
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state.stmtQueryPathInfo.create(db,
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"select id, hash, registrationTime, deriver, narSize, ultimate, sigs from ValidPaths where path = ?;");
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state.stmtQueryReferences.create(db,
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"select path from Refs join ValidPaths on reference = id where referrer = ?;");
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state.stmtQueryReferrers.create(db,
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"select path from Refs join ValidPaths on referrer = id where reference = (select id from ValidPaths where path = ?);");
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state.stmtInvalidatePath.create(db,
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"delete from ValidPaths where path = ?;");
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state.stmtAddDerivationOutput.create(db,
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"insert or replace into DerivationOutputs (drv, id, path) values (?, ?, ?);");
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state.stmtQueryValidDerivers.create(db,
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"select v.id, v.path from DerivationOutputs d join ValidPaths v on d.drv = v.id where d.path = ?;");
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state.stmtQueryDerivationOutputs.create(db,
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"select id, path from DerivationOutputs where drv = ?;");
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// Use "path >= ?" with limit 1 rather than "path like '?%'" to
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// ensure efficient lookup.
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state.stmtQueryPathFromHashPart.create(db,
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"select path from ValidPaths where path >= ? limit 1;");
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state.stmtQueryValidPaths.create(db, "select path from ValidPaths");
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}
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/* To improve purity, users may want to make the Nix store a read-only
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bind mount. So make the Nix store writable for this process. */
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void LocalStore::makeStoreWritable()
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{
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#if __linux__
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if (getuid() != 0) return;
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/* Check if /nix/store is on a read-only mount. */
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struct statvfs stat;
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if (statvfs(settings.nixStore.c_str(), &stat) != 0)
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throw SysError("getting info about the Nix store mount point");
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if (stat.f_flag & ST_RDONLY) {
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if (unshare(CLONE_NEWNS) == -1)
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throw SysError("setting up a private mount namespace");
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if (mount(0, settings.nixStore.c_str(), "none", MS_REMOUNT | MS_BIND, 0) == -1)
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throw SysError(format("remounting %1% writable") % settings.nixStore);
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}
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#endif
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}
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const time_t mtimeStore = 1; /* 1 second into the epoch */
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static void canonicaliseTimestampAndPermissions(const Path & path, const struct stat & st)
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{
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if (!S_ISLNK(st.st_mode)) {
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/* Mask out all type related bits. */
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mode_t mode = st.st_mode & ~S_IFMT;
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if (mode != 0444 && mode != 0555) {
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mode = (st.st_mode & S_IFMT)
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| 0444
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| (st.st_mode & S_IXUSR ? 0111 : 0);
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if (chmod(path.c_str(), mode) == -1)
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throw SysError(format("changing mode of ‘%1%’ to %2$o") % path % mode);
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}
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}
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if (st.st_mtime != mtimeStore) {
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struct timeval times[2];
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times[0].tv_sec = st.st_atime;
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times[0].tv_usec = 0;
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times[1].tv_sec = mtimeStore;
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times[1].tv_usec = 0;
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#if HAVE_LUTIMES
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if (lutimes(path.c_str(), times) == -1)
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if (errno != ENOSYS ||
|
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(!S_ISLNK(st.st_mode) && utimes(path.c_str(), times) == -1))
|
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#else
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if (!S_ISLNK(st.st_mode) && utimes(path.c_str(), times) == -1)
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#endif
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throw SysError(format("changing modification time of ‘%1%’") % path);
|
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}
|
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}
|
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|
||
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void canonicaliseTimestampAndPermissions(const Path & path)
|
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{
|
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struct stat st;
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if (lstat(path.c_str(), &st))
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throw SysError(format("getting attributes of path ‘%1%’") % path);
|
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canonicaliseTimestampAndPermissions(path, st);
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}
|
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|
||
|
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static void canonicalisePathMetaData_(const Path & path, uid_t fromUid, InodesSeen & inodesSeen)
|
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{
|
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checkInterrupt();
|
||
|
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struct stat st;
|
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if (lstat(path.c_str(), &st))
|
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throw SysError(format("getting attributes of path ‘%1%’") % path);
|
||
|
||
/* Really make sure that the path is of a supported type. */
|
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if (!(S_ISREG(st.st_mode) || S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)))
|
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throw Error(format("file ‘%1%’ has an unsupported type") % path);
|
||
|
||
/* Fail if the file is not owned by the build user. This prevents
|
||
us from messing up the ownership/permissions of files
|
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hard-linked into the output (e.g. "ln /etc/shadow $out/foo").
|
||
However, ignore files that we chown'ed ourselves previously to
|
||
ensure that we don't fail on hard links within the same build
|
||
(i.e. "touch $out/foo; ln $out/foo $out/bar"). */
|
||
if (fromUid != (uid_t) -1 && st.st_uid != fromUid) {
|
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assert(!S_ISDIR(st.st_mode));
|
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if (inodesSeen.find(Inode(st.st_dev, st.st_ino)) == inodesSeen.end())
|
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throw BuildError(format("invalid ownership on file ‘%1%’") % path);
|
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mode_t mode = st.st_mode & ~S_IFMT;
|
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assert(S_ISLNK(st.st_mode) || (st.st_uid == geteuid() && (mode == 0444 || mode == 0555) && st.st_mtime == mtimeStore));
|
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return;
|
||
}
|
||
|
||
inodesSeen.insert(Inode(st.st_dev, st.st_ino));
|
||
|
||
canonicaliseTimestampAndPermissions(path, st);
|
||
|
||
/* Change ownership to the current uid. If it's a symlink, use
|
||
lchown if available, otherwise don't bother. Wrong ownership
|
||
of a symlink doesn't matter, since the owning user can't change
|
||
the symlink and can't delete it because the directory is not
|
||
writable. The only exception is top-level paths in the Nix
|
||
store (since that directory is group-writable for the Nix build
|
||
users group); we check for this case below. */
|
||
if (st.st_uid != geteuid()) {
|
||
#if HAVE_LCHOWN
|
||
if (lchown(path.c_str(), geteuid(), getegid()) == -1)
|
||
#else
|
||
if (!S_ISLNK(st.st_mode) &&
|
||
chown(path.c_str(), geteuid(), getegid()) == -1)
|
||
#endif
|
||
throw SysError(format("changing owner of ‘%1%’ to %2%")
|
||
% path % geteuid());
|
||
}
|
||
|
||
if (S_ISDIR(st.st_mode)) {
|
||
DirEntries entries = readDirectory(path);
|
||
for (auto & i : entries)
|
||
canonicalisePathMetaData_(path + "/" + i.name, fromUid, inodesSeen);
|
||
}
|
||
}
|
||
|
||
|
||
void canonicalisePathMetaData(const Path & path, uid_t fromUid, InodesSeen & inodesSeen)
|
||
{
|
||
canonicalisePathMetaData_(path, fromUid, inodesSeen);
|
||
|
||
/* On platforms that don't have lchown(), the top-level path can't
|
||
be a symlink, since we can't change its ownership. */
|
||
struct stat st;
|
||
if (lstat(path.c_str(), &st))
|
||
throw SysError(format("getting attributes of path ‘%1%’") % path);
|
||
|
||
if (st.st_uid != geteuid()) {
|
||
assert(S_ISLNK(st.st_mode));
|
||
throw Error(format("wrong ownership of top-level store path ‘%1%’") % path);
|
||
}
|
||
}
|
||
|
||
|
||
void canonicalisePathMetaData(const Path & path, uid_t fromUid)
|
||
{
|
||
InodesSeen inodesSeen;
|
||
canonicalisePathMetaData(path, fromUid, inodesSeen);
|
||
}
|
||
|
||
|
||
void LocalStore::checkDerivationOutputs(const Path & drvPath, const Derivation & drv)
|
||
{
|
||
string drvName = storePathToName(drvPath);
|
||
assert(isDerivation(drvName));
|
||
drvName = string(drvName, 0, drvName.size() - drvExtension.size());
|
||
|
||
if (drv.isFixedOutput()) {
|
||
DerivationOutputs::const_iterator out = drv.outputs.find("out");
|
||
if (out == drv.outputs.end())
|
||
throw Error(format("derivation ‘%1%’ does not have an output named ‘out’") % drvPath);
|
||
|
||
bool recursive; HashType ht; Hash h;
|
||
out->second.parseHashInfo(recursive, ht, h);
|
||
Path outPath = makeFixedOutputPath(recursive, ht, h, drvName);
|
||
|
||
StringPairs::const_iterator j = drv.env.find("out");
|
||
if (out->second.path != outPath || j == drv.env.end() || j->second != outPath)
|
||
throw Error(format("derivation ‘%1%’ has incorrect output ‘%2%’, should be ‘%3%’")
|
||
% drvPath % out->second.path % outPath);
|
||
}
|
||
|
||
else {
|
||
Derivation drvCopy(drv);
|
||
for (auto & i : drvCopy.outputs) {
|
||
i.second.path = "";
|
||
drvCopy.env[i.first] = "";
|
||
}
|
||
|
||
Hash h = hashDerivationModulo(*this, drvCopy);
|
||
|
||
for (auto & i : drv.outputs) {
|
||
Path outPath = makeOutputPath(i.first, h, drvName);
|
||
StringPairs::const_iterator j = drv.env.find(i.first);
|
||
if (i.second.path != outPath || j == drv.env.end() || j->second != outPath)
|
||
throw Error(format("derivation ‘%1%’ has incorrect output ‘%2%’, should be ‘%3%’")
|
||
% drvPath % i.second.path % outPath);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
uint64_t LocalStore::addValidPath(State & state,
|
||
const ValidPathInfo & info, bool checkOutputs)
|
||
{
|
||
state.stmtRegisterValidPath.use()
|
||
(info.path)
|
||
("sha256:" + printHash(info.narHash))
|
||
(info.registrationTime == 0 ? time(0) : info.registrationTime)
|
||
(info.deriver, info.deriver != "")
|
||
(info.narSize, info.narSize != 0)
|
||
(info.ultimate ? 1 : 0, info.ultimate)
|
||
(concatStringsSep(" ", info.sigs), !info.sigs.empty())
|
||
.exec();
|
||
uint64_t id = sqlite3_last_insert_rowid(state.db);
|
||
|
||
/* If this is a derivation, then store the derivation outputs in
|
||
the database. This is useful for the garbage collector: it can
|
||
efficiently query whether a path is an output of some
|
||
derivation. */
|
||
if (isDerivation(info.path)) {
|
||
Derivation drv = readDerivation(info.path);
|
||
|
||
/* Verify that the output paths in the derivation are correct
|
||
(i.e., follow the scheme for computing output paths from
|
||
derivations). Note that if this throws an error, then the
|
||
DB transaction is rolled back, so the path validity
|
||
registration above is undone. */
|
||
if (checkOutputs) checkDerivationOutputs(info.path, drv);
|
||
|
||
for (auto & i : drv.outputs) {
|
||
state.stmtAddDerivationOutput.use()
|
||
(id)
|
||
(i.first)
|
||
(i.second.path)
|
||
.exec();
|
||
}
|
||
}
|
||
|
||
{
|
||
auto state_(Store::state.lock());
|
||
state_->pathInfoCache.upsert(storePathToHash(info.path), std::make_shared<ValidPathInfo>(info));
|
||
}
|
||
|
||
return id;
|
||
}
|
||
|
||
|
||
Hash parseHashField(const Path & path, const string & s)
|
||
{
|
||
string::size_type colon = s.find(':');
|
||
if (colon == string::npos)
|
||
throw Error(format("corrupt hash ‘%1%’ in valid-path entry for ‘%2%’")
|
||
% s % path);
|
||
HashType ht = parseHashType(string(s, 0, colon));
|
||
if (ht == htUnknown)
|
||
throw Error(format("unknown hash type ‘%1%’ in valid-path entry for ‘%2%’")
|
||
% string(s, 0, colon) % path);
|
||
return parseHash(ht, string(s, colon + 1));
|
||
}
|
||
|
||
|
||
std::shared_ptr<ValidPathInfo> LocalStore::queryPathInfoUncached(const Path & path)
|
||
{
|
||
auto info = std::make_shared<ValidPathInfo>();
|
||
info->path = path;
|
||
|
||
assertStorePath(path);
|
||
|
||
return retrySQLite<std::shared_ptr<ValidPathInfo>>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
/* Get the path info. */
|
||
auto useQueryPathInfo(state->stmtQueryPathInfo.use()(path));
|
||
|
||
if (!useQueryPathInfo.next())
|
||
return std::shared_ptr<ValidPathInfo>();
|
||
|
||
info->id = useQueryPathInfo.getInt(0);
|
||
|
||
info->narHash = parseHashField(path, useQueryPathInfo.getStr(1));
|
||
|
||
info->registrationTime = useQueryPathInfo.getInt(2);
|
||
|
||
auto s = (const char *) sqlite3_column_text(state->stmtQueryPathInfo, 3);
|
||
if (s) info->deriver = s;
|
||
|
||
/* Note that narSize = NULL yields 0. */
|
||
info->narSize = useQueryPathInfo.getInt(4);
|
||
|
||
info->ultimate = useQueryPathInfo.getInt(5) == 1;
|
||
|
||
s = (const char *) sqlite3_column_text(state->stmtQueryPathInfo, 6);
|
||
if (s) info->sigs = tokenizeString<StringSet>(s, " ");
|
||
|
||
/* Get the references. */
|
||
auto useQueryReferences(state->stmtQueryReferences.use()(info->id));
|
||
|
||
while (useQueryReferences.next())
|
||
info->references.insert(useQueryReferences.getStr(0));
|
||
|
||
return info;
|
||
});
|
||
}
|
||
|
||
|
||
/* Update path info in the database. */
|
||
void LocalStore::updatePathInfo(State & state, const ValidPathInfo & info)
|
||
{
|
||
state.stmtUpdatePathInfo.use()
|
||
(info.narSize, info.narSize != 0)
|
||
("sha256:" + printHash(info.narHash))
|
||
(info.ultimate ? 1 : 0, info.ultimate)
|
||
(concatStringsSep(" ", info.sigs), !info.sigs.empty())
|
||
(info.path)
|
||
.exec();
|
||
}
|
||
|
||
|
||
uint64_t LocalStore::queryValidPathId(State & state, const Path & path)
|
||
{
|
||
auto use(state.stmtQueryPathInfo.use()(path));
|
||
if (!use.next())
|
||
throw Error(format("path ‘%1%’ is not valid") % path);
|
||
return use.getInt(0);
|
||
}
|
||
|
||
|
||
bool LocalStore::isValidPath_(State & state, const Path & path)
|
||
{
|
||
return state.stmtQueryPathInfo.use()(path).next();
|
||
}
|
||
|
||
|
||
bool LocalStore::isValidPathUncached(const Path & path)
|
||
{
|
||
return retrySQLite<bool>([&]() {
|
||
auto state(_state.lock());
|
||
return isValidPath_(*state, path);
|
||
});
|
||
}
|
||
|
||
|
||
PathSet LocalStore::queryValidPaths(const PathSet & paths)
|
||
{
|
||
PathSet res;
|
||
for (auto & i : paths)
|
||
if (isValidPath(i)) res.insert(i);
|
||
return res;
|
||
}
|
||
|
||
|
||
PathSet LocalStore::queryAllValidPaths()
|
||
{
|
||
return retrySQLite<PathSet>([&]() {
|
||
auto state(_state.lock());
|
||
auto use(state->stmtQueryValidPaths.use());
|
||
PathSet res;
|
||
while (use.next()) res.insert(use.getStr(0));
|
||
return res;
|
||
});
|
||
}
|
||
|
||
|
||
void LocalStore::queryReferrers(State & state, const Path & path, PathSet & referrers)
|
||
{
|
||
auto useQueryReferrers(state.stmtQueryReferrers.use()(path));
|
||
|
||
while (useQueryReferrers.next())
|
||
referrers.insert(useQueryReferrers.getStr(0));
|
||
}
|
||
|
||
|
||
void LocalStore::queryReferrers(const Path & path, PathSet & referrers)
|
||
{
|
||
assertStorePath(path);
|
||
return retrySQLite<void>([&]() {
|
||
auto state(_state.lock());
|
||
queryReferrers(*state, path, referrers);
|
||
});
|
||
}
|
||
|
||
|
||
PathSet LocalStore::queryValidDerivers(const Path & path)
|
||
{
|
||
assertStorePath(path);
|
||
|
||
return retrySQLite<PathSet>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
auto useQueryValidDerivers(state->stmtQueryValidDerivers.use()(path));
|
||
|
||
PathSet derivers;
|
||
while (useQueryValidDerivers.next())
|
||
derivers.insert(useQueryValidDerivers.getStr(1));
|
||
|
||
return derivers;
|
||
});
|
||
}
|
||
|
||
|
||
PathSet LocalStore::queryDerivationOutputs(const Path & path)
|
||
{
|
||
return retrySQLite<PathSet>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
auto useQueryDerivationOutputs(state->stmtQueryDerivationOutputs.use()
|
||
(queryValidPathId(*state, path)));
|
||
|
||
PathSet outputs;
|
||
while (useQueryDerivationOutputs.next())
|
||
outputs.insert(useQueryDerivationOutputs.getStr(1));
|
||
|
||
return outputs;
|
||
});
|
||
}
|
||
|
||
|
||
StringSet LocalStore::queryDerivationOutputNames(const Path & path)
|
||
{
|
||
return retrySQLite<StringSet>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
auto useQueryDerivationOutputs(state->stmtQueryDerivationOutputs.use()
|
||
(queryValidPathId(*state, path)));
|
||
|
||
StringSet outputNames;
|
||
while (useQueryDerivationOutputs.next())
|
||
outputNames.insert(useQueryDerivationOutputs.getStr(0));
|
||
|
||
return outputNames;
|
||
});
|
||
}
|
||
|
||
|
||
Path LocalStore::queryPathFromHashPart(const string & hashPart)
|
||
{
|
||
if (hashPart.size() != storePathHashLen) throw Error("invalid hash part");
|
||
|
||
Path prefix = settings.nixStore + "/" + hashPart;
|
||
|
||
return retrySQLite<Path>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
auto useQueryPathFromHashPart(state->stmtQueryPathFromHashPart.use()(prefix));
|
||
|
||
if (!useQueryPathFromHashPart.next()) return "";
|
||
|
||
const char * s = (const char *) sqlite3_column_text(state->stmtQueryPathFromHashPart, 0);
|
||
return s && prefix.compare(0, prefix.size(), s, prefix.size()) == 0 ? s : "";
|
||
});
|
||
}
|
||
|
||
|
||
PathSet LocalStore::querySubstitutablePaths(const PathSet & paths)
|
||
{
|
||
PathSet res;
|
||
for (auto & sub : getDefaultSubstituters()) {
|
||
if (!sub->wantMassQuery()) continue;
|
||
for (auto & path : paths) {
|
||
if (res.count(path)) continue;
|
||
debug(format("checking substituter ‘%s’ for path ‘%s’")
|
||
% sub->getUri() % path);
|
||
if (sub->isValidPath(path))
|
||
res.insert(path);
|
||
}
|
||
}
|
||
return res;
|
||
}
|
||
|
||
|
||
void LocalStore::querySubstitutablePathInfos(const PathSet & paths,
|
||
SubstitutablePathInfos & infos)
|
||
{
|
||
for (auto & sub : getDefaultSubstituters()) {
|
||
for (auto & path : paths) {
|
||
if (infos.count(path)) continue;
|
||
debug(format("checking substituter ‘%s’ for path ‘%s’")
|
||
% sub->getUri() % path);
|
||
try {
|
||
auto info = sub->queryPathInfo(path);
|
||
auto narInfo = std::dynamic_pointer_cast<const NarInfo>(
|
||
std::shared_ptr<const ValidPathInfo>(info));
|
||
infos[path] = SubstitutablePathInfo{
|
||
info->deriver,
|
||
info->references,
|
||
narInfo ? narInfo->fileSize : 0,
|
||
info->narSize};
|
||
} catch (InvalidPath) {
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void LocalStore::registerValidPath(const ValidPathInfo & info)
|
||
{
|
||
ValidPathInfos infos;
|
||
infos.push_back(info);
|
||
registerValidPaths(infos);
|
||
}
|
||
|
||
|
||
void LocalStore::registerValidPaths(const ValidPathInfos & infos)
|
||
{
|
||
/* SQLite will fsync by default, but the new valid paths may not
|
||
be fsync-ed. So some may want to fsync them before registering
|
||
the validity, at the expense of some speed of the path
|
||
registering operation. */
|
||
if (settings.syncBeforeRegistering) sync();
|
||
|
||
return retrySQLite<void>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
SQLiteTxn txn(state->db);
|
||
PathSet paths;
|
||
|
||
for (auto & i : infos) {
|
||
assert(i.narHash.type == htSHA256);
|
||
if (isValidPath_(*state, i.path))
|
||
updatePathInfo(*state, i);
|
||
else
|
||
addValidPath(*state, i, false);
|
||
paths.insert(i.path);
|
||
}
|
||
|
||
for (auto & i : infos) {
|
||
auto referrer = queryValidPathId(*state, i.path);
|
||
for (auto & j : i.references)
|
||
state->stmtAddReference.use()(referrer)(queryValidPathId(*state, j)).exec();
|
||
}
|
||
|
||
/* Check that the derivation outputs are correct. We can't do
|
||
this in addValidPath() above, because the references might
|
||
not be valid yet. */
|
||
for (auto & i : infos)
|
||
if (isDerivation(i.path)) {
|
||
// FIXME: inefficient; we already loaded the
|
||
// derivation in addValidPath().
|
||
Derivation drv = readDerivation(i.path);
|
||
checkDerivationOutputs(i.path, drv);
|
||
}
|
||
|
||
/* Do a topological sort of the paths. This will throw an
|
||
error if a cycle is detected and roll back the
|
||
transaction. Cycles can only occur when a derivation
|
||
has multiple outputs. */
|
||
topoSortPaths(paths);
|
||
|
||
txn.commit();
|
||
});
|
||
}
|
||
|
||
|
||
/* Invalidate a path. The caller is responsible for checking that
|
||
there are no referrers. */
|
||
void LocalStore::invalidatePath(State & state, const Path & path)
|
||
{
|
||
debug(format("invalidating path ‘%1%’") % path);
|
||
|
||
state.stmtInvalidatePath.use()(path).exec();
|
||
|
||
/* Note that the foreign key constraints on the Refs table take
|
||
care of deleting the references entries for `path'. */
|
||
|
||
{
|
||
auto state_(Store::state.lock());
|
||
state_->pathInfoCache.erase(storePathToHash(path));
|
||
}
|
||
}
|
||
|
||
|
||
void LocalStore::addToStore(const ValidPathInfo & info, const std::string & nar,
|
||
bool repair, bool dontCheckSigs)
|
||
{
|
||
Hash h = hashString(htSHA256, nar);
|
||
if (h != info.narHash)
|
||
throw Error(format("hash mismatch importing path ‘%s’; expected hash ‘%s’, got ‘%s’") %
|
||
info.path % info.narHash.to_string() % h.to_string());
|
||
|
||
if (requireSigs && !dontCheckSigs && !info.checkSignatures(publicKeys))
|
||
throw Error(format("cannot import path ‘%s’ because it lacks a valid signature") % info.path);
|
||
|
||
addTempRoot(info.path);
|
||
|
||
if (repair || !isValidPath(info.path)) {
|
||
|
||
PathLocks outputLock;
|
||
|
||
/* Lock the output path. But don't lock if we're being called
|
||
from a build hook (whose parent process already acquired a
|
||
lock on this path). */
|
||
Strings locksHeld = tokenizeString<Strings>(getEnv("NIX_HELD_LOCKS"));
|
||
if (find(locksHeld.begin(), locksHeld.end(), info.path) == locksHeld.end())
|
||
outputLock.lockPaths({info.path});
|
||
|
||
if (repair || !isValidPath(info.path)) {
|
||
|
||
deletePath(info.path);
|
||
|
||
StringSource source(nar);
|
||
restorePath(info.path, source);
|
||
|
||
canonicalisePathMetaData(info.path, -1);
|
||
|
||
optimisePath(info.path); // FIXME: combine with hashPath()
|
||
|
||
registerValidPath(info);
|
||
}
|
||
|
||
outputLock.setDeletion(true);
|
||
}
|
||
}
|
||
|
||
|
||
Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
|
||
bool recursive, HashType hashAlgo, bool repair)
|
||
{
|
||
Hash h = hashString(hashAlgo, dump);
|
||
|
||
Path dstPath = makeFixedOutputPath(recursive, hashAlgo, h, name);
|
||
|
||
addTempRoot(dstPath);
|
||
|
||
if (repair || !isValidPath(dstPath)) {
|
||
|
||
/* The first check above is an optimisation to prevent
|
||
unnecessary lock acquisition. */
|
||
|
||
PathLocks outputLock({dstPath});
|
||
|
||
if (repair || !isValidPath(dstPath)) {
|
||
|
||
deletePath(dstPath);
|
||
|
||
if (recursive) {
|
||
StringSource source(dump);
|
||
restorePath(dstPath, source);
|
||
} else
|
||
writeFile(dstPath, dump);
|
||
|
||
canonicalisePathMetaData(dstPath, -1);
|
||
|
||
/* Register the SHA-256 hash of the NAR serialisation of
|
||
the path in the database. We may just have computed it
|
||
above (if called with recursive == true and hashAlgo ==
|
||
sha256); otherwise, compute it here. */
|
||
HashResult hash;
|
||
if (recursive) {
|
||
hash.first = hashAlgo == htSHA256 ? h : hashString(htSHA256, dump);
|
||
hash.second = dump.size();
|
||
} else
|
||
hash = hashPath(htSHA256, dstPath);
|
||
|
||
optimisePath(dstPath); // FIXME: combine with hashPath()
|
||
|
||
ValidPathInfo info;
|
||
info.path = dstPath;
|
||
info.narHash = hash.first;
|
||
info.narSize = hash.second;
|
||
info.ultimate = true;
|
||
registerValidPath(info);
|
||
}
|
||
|
||
outputLock.setDeletion(true);
|
||
}
|
||
|
||
return dstPath;
|
||
}
|
||
|
||
|
||
Path LocalStore::addToStore(const string & name, const Path & _srcPath,
|
||
bool recursive, HashType hashAlgo, PathFilter & filter, bool repair)
|
||
{
|
||
Path srcPath(absPath(_srcPath));
|
||
|
||
/* Read the whole path into memory. This is not a very scalable
|
||
method for very large paths, but `copyPath' is mainly used for
|
||
small files. */
|
||
StringSink sink;
|
||
if (recursive)
|
||
dumpPath(srcPath, sink, filter);
|
||
else
|
||
sink.s = make_ref<std::string>(readFile(srcPath));
|
||
|
||
return addToStoreFromDump(*sink.s, name, recursive, hashAlgo, repair);
|
||
}
|
||
|
||
|
||
Path LocalStore::addTextToStore(const string & name, const string & s,
|
||
const PathSet & references, bool repair)
|
||
{
|
||
Path dstPath = computeStorePathForText(name, s, references);
|
||
|
||
addTempRoot(dstPath);
|
||
|
||
if (repair || !isValidPath(dstPath)) {
|
||
|
||
PathLocks outputLock({dstPath});
|
||
|
||
if (repair || !isValidPath(dstPath)) {
|
||
|
||
deletePath(dstPath);
|
||
|
||
writeFile(dstPath, s);
|
||
|
||
canonicalisePathMetaData(dstPath, -1);
|
||
|
||
StringSink sink;
|
||
dumpString(s, sink);
|
||
auto hash = hashString(htSHA256, *sink.s);
|
||
|
||
optimisePath(dstPath);
|
||
|
||
ValidPathInfo info;
|
||
info.path = dstPath;
|
||
info.narHash = hash;
|
||
info.narSize = sink.s->size();
|
||
info.references = references;
|
||
info.ultimate = true;
|
||
registerValidPath(info);
|
||
}
|
||
|
||
outputLock.setDeletion(true);
|
||
}
|
||
|
||
return dstPath;
|
||
}
|
||
|
||
|
||
/* Create a temporary directory in the store that won't be
|
||
garbage-collected. */
|
||
Path LocalStore::createTempDirInStore()
|
||
{
|
||
Path tmpDir;
|
||
do {
|
||
/* There is a slight possibility that `tmpDir' gets deleted by
|
||
the GC between createTempDir() and addTempRoot(), so repeat
|
||
until `tmpDir' exists. */
|
||
tmpDir = createTempDir(settings.nixStore);
|
||
addTempRoot(tmpDir);
|
||
} while (!pathExists(tmpDir));
|
||
return tmpDir;
|
||
}
|
||
|
||
|
||
void LocalStore::invalidatePathChecked(const Path & path)
|
||
{
|
||
assertStorePath(path);
|
||
|
||
retrySQLite<void>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
SQLiteTxn txn(state->db);
|
||
|
||
if (isValidPath_(*state, path)) {
|
||
PathSet referrers; queryReferrers(*state, path, referrers);
|
||
referrers.erase(path); /* ignore self-references */
|
||
if (!referrers.empty())
|
||
throw PathInUse(format("cannot delete path ‘%1%’ because it is in use by %2%")
|
||
% path % showPaths(referrers));
|
||
invalidatePath(*state, path);
|
||
}
|
||
|
||
txn.commit();
|
||
});
|
||
}
|
||
|
||
|
||
bool LocalStore::verifyStore(bool checkContents, bool repair)
|
||
{
|
||
printMsg(lvlError, format("reading the Nix store..."));
|
||
|
||
bool errors = false;
|
||
|
||
/* Acquire the global GC lock to prevent a garbage collection. */
|
||
AutoCloseFD fdGCLock = openGCLock(ltWrite);
|
||
|
||
PathSet store;
|
||
for (auto & i : readDirectory(settings.nixStore)) store.insert(i.name);
|
||
|
||
/* Check whether all valid paths actually exist. */
|
||
printMsg(lvlInfo, "checking path existence...");
|
||
|
||
PathSet validPaths2 = queryAllValidPaths(), validPaths, done;
|
||
|
||
for (auto & i : validPaths2)
|
||
verifyPath(i, store, done, validPaths, repair, errors);
|
||
|
||
/* Release the GC lock so that checking content hashes (which can
|
||
take ages) doesn't block the GC or builds. */
|
||
fdGCLock.close();
|
||
|
||
/* Optionally, check the content hashes (slow). */
|
||
if (checkContents) {
|
||
printMsg(lvlInfo, "checking hashes...");
|
||
|
||
Hash nullHash(htSHA256);
|
||
|
||
for (auto & i : validPaths) {
|
||
try {
|
||
auto info = std::const_pointer_cast<ValidPathInfo>(std::shared_ptr<const ValidPathInfo>(queryPathInfo(i)));
|
||
|
||
/* Check the content hash (optionally - slow). */
|
||
printMsg(lvlTalkative, format("checking contents of ‘%1%’") % i);
|
||
HashResult current = hashPath(info->narHash.type, i);
|
||
|
||
if (info->narHash != nullHash && info->narHash != current.first) {
|
||
printMsg(lvlError, format("path ‘%1%’ was modified! "
|
||
"expected hash ‘%2%’, got ‘%3%’")
|
||
% i % printHash(info->narHash) % printHash(current.first));
|
||
if (repair) repairPath(i); else errors = true;
|
||
} else {
|
||
|
||
bool update = false;
|
||
|
||
/* Fill in missing hashes. */
|
||
if (info->narHash == nullHash) {
|
||
printMsg(lvlError, format("fixing missing hash on ‘%1%’") % i);
|
||
info->narHash = current.first;
|
||
update = true;
|
||
}
|
||
|
||
/* Fill in missing narSize fields (from old stores). */
|
||
if (info->narSize == 0) {
|
||
printMsg(lvlError, format("updating size field on ‘%1%’ to %2%") % i % current.second);
|
||
info->narSize = current.second;
|
||
update = true;
|
||
}
|
||
|
||
if (update) {
|
||
auto state(_state.lock());
|
||
updatePathInfo(*state, *info);
|
||
}
|
||
|
||
}
|
||
|
||
} catch (Error & e) {
|
||
/* It's possible that the path got GC'ed, so ignore
|
||
errors on invalid paths. */
|
||
if (isValidPath(i))
|
||
printMsg(lvlError, format("error: %1%") % e.msg());
|
||
else
|
||
printMsg(lvlError, format("warning: %1%") % e.msg());
|
||
errors = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
return errors;
|
||
}
|
||
|
||
|
||
void LocalStore::verifyPath(const Path & path, const PathSet & store,
|
||
PathSet & done, PathSet & validPaths, bool repair, bool & errors)
|
||
{
|
||
checkInterrupt();
|
||
|
||
if (done.find(path) != done.end()) return;
|
||
done.insert(path);
|
||
|
||
if (!isStorePath(path)) {
|
||
printMsg(lvlError, format("path ‘%1%’ is not in the Nix store") % path);
|
||
auto state(_state.lock());
|
||
invalidatePath(*state, path);
|
||
return;
|
||
}
|
||
|
||
if (store.find(baseNameOf(path)) == store.end()) {
|
||
/* Check any referrers first. If we can invalidate them
|
||
first, then we can invalidate this path as well. */
|
||
bool canInvalidate = true;
|
||
PathSet referrers; queryReferrers(path, referrers);
|
||
for (auto & i : referrers)
|
||
if (i != path) {
|
||
verifyPath(i, store, done, validPaths, repair, errors);
|
||
if (validPaths.find(i) != validPaths.end())
|
||
canInvalidate = false;
|
||
}
|
||
|
||
if (canInvalidate) {
|
||
printMsg(lvlError, format("path ‘%1%’ disappeared, removing from database...") % path);
|
||
auto state(_state.lock());
|
||
invalidatePath(*state, path);
|
||
} else {
|
||
printMsg(lvlError, format("path ‘%1%’ disappeared, but it still has valid referrers!") % path);
|
||
if (repair)
|
||
try {
|
||
repairPath(path);
|
||
} catch (Error & e) {
|
||
printMsg(lvlError, format("warning: %1%") % e.msg());
|
||
errors = true;
|
||
}
|
||
else errors = true;
|
||
}
|
||
|
||
return;
|
||
}
|
||
|
||
validPaths.insert(path);
|
||
}
|
||
|
||
|
||
#if defined(FS_IOC_SETFLAGS) && defined(FS_IOC_GETFLAGS) && defined(FS_IMMUTABLE_FL)
|
||
|
||
static void makeMutable(const Path & path)
|
||
{
|
||
checkInterrupt();
|
||
|
||
struct stat st = lstat(path);
|
||
|
||
if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) return;
|
||
|
||
if (S_ISDIR(st.st_mode)) {
|
||
for (auto & i : readDirectory(path))
|
||
makeMutable(path + "/" + i.name);
|
||
}
|
||
|
||
/* The O_NOFOLLOW is important to prevent us from changing the
|
||
mutable bit on the target of a symlink (which would be a
|
||
security hole). */
|
||
AutoCloseFD fd = open(path.c_str(), O_RDONLY | O_NOFOLLOW);
|
||
if (fd == -1) {
|
||
if (errno == ELOOP) return; // it's a symlink
|
||
throw SysError(format("opening file ‘%1%’") % path);
|
||
}
|
||
|
||
unsigned int flags = 0, old;
|
||
|
||
/* Silently ignore errors getting/setting the immutable flag so
|
||
that we work correctly on filesystems that don't support it. */
|
||
if (ioctl(fd, FS_IOC_GETFLAGS, &flags)) return;
|
||
old = flags;
|
||
flags &= ~FS_IMMUTABLE_FL;
|
||
if (old == flags) return;
|
||
if (ioctl(fd, FS_IOC_SETFLAGS, &flags)) return;
|
||
}
|
||
|
||
/* Upgrade from schema 6 (Nix 0.15) to schema 7 (Nix >= 1.3). */
|
||
void LocalStore::upgradeStore7()
|
||
{
|
||
if (getuid() != 0) return;
|
||
printMsg(lvlError, "removing immutable bits from the Nix store (this may take a while)...");
|
||
makeMutable(settings.nixStore);
|
||
}
|
||
|
||
#else
|
||
|
||
void LocalStore::upgradeStore7()
|
||
{
|
||
}
|
||
|
||
#endif
|
||
|
||
|
||
void LocalStore::vacuumDB()
|
||
{
|
||
auto state(_state.lock());
|
||
|
||
if (sqlite3_exec(state->db, "vacuum;", 0, 0, 0) != SQLITE_OK)
|
||
throwSQLiteError(state->db, "vacuuming SQLite database");
|
||
}
|
||
|
||
|
||
void LocalStore::addSignatures(const Path & storePath, const StringSet & sigs)
|
||
{
|
||
retrySQLite<void>([&]() {
|
||
auto state(_state.lock());
|
||
|
||
SQLiteTxn txn(state->db);
|
||
|
||
auto info = std::const_pointer_cast<ValidPathInfo>(std::shared_ptr<const ValidPathInfo>(queryPathInfo(storePath)));
|
||
|
||
info->sigs.insert(sigs.begin(), sigs.end());
|
||
|
||
updatePathInfo(*state, *info);
|
||
|
||
txn.commit();
|
||
});
|
||
}
|
||
|
||
|
||
void LocalStore::signPathInfo(ValidPathInfo & info)
|
||
{
|
||
// FIXME: keep secret keys in memory.
|
||
|
||
auto secretKeyFiles = settings.get("secret-key-files", Strings());
|
||
|
||
for (auto & secretKeyFile : secretKeyFiles) {
|
||
SecretKey secretKey(readFile(secretKeyFile));
|
||
info.sign(secretKey);
|
||
}
|
||
}
|
||
|
||
|
||
}
|