1420 lines
41 KiB
C++
1420 lines
41 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 <iostream>
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#include <algorithm>
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#include <sys/types.h>
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#include <sys/stat.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 <sqlite3.h>
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namespace nix {
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class SQLiteError : public Error
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{
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public:
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SQLiteError(sqlite3 * db, const format & f)
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: Error(format("%1%: %2%") % f.str() % sqlite3_errmsg(db))
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{
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}
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};
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SQLite::~SQLite()
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{
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try {
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if (db && sqlite3_close(db) != SQLITE_OK)
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throw SQLiteError(db, "closing database");
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} catch (...) {
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ignoreException();
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}
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}
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void SQLiteStmt::create(sqlite3 * db, const string & s)
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{
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checkInterrupt();
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assert(!stmt);
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if (sqlite3_prepare_v2(db, s.c_str(), -1, &stmt, 0) != SQLITE_OK)
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throw SQLiteError(db, "creating statement");
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this->db = db;
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}
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void SQLiteStmt::reset()
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{
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assert(stmt);
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if (sqlite3_reset(stmt) != SQLITE_OK)
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throw SQLiteError(db, "resetting statement");
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curArg = 1;
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}
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SQLiteStmt::~SQLiteStmt()
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{
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try {
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if (stmt && sqlite3_finalize(stmt) != SQLITE_OK)
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throw SQLiteError(db, "finalizing statement");
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} catch (...) {
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ignoreException();
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}
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}
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void SQLiteStmt::bind(const string & value)
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{
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if (sqlite3_bind_text(stmt, curArg++, value.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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}
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void SQLiteStmt::bind(int value)
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{
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if (sqlite3_bind_int(stmt, curArg++, value) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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}
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void SQLiteStmt::bind()
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{
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if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK)
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throw SQLiteError(db, "binding argument");
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}
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/* Helper class to ensure that prepared statements are reset when
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leaving the scope that uses them. Unfinished prepared statements
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prevent transactions from being aborted, and can cause locks to be
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kept when they should be released. */
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struct SQLiteStmtUse
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{
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SQLiteStmt & stmt;
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SQLiteStmtUse(SQLiteStmt & stmt) : stmt(stmt)
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{
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stmt.reset();
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}
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~SQLiteStmtUse()
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{
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try {
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stmt.reset();
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} catch (...) {
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ignoreException();
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}
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}
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};
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struct SQLiteTxn
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{
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bool active;
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sqlite3 * db;
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SQLiteTxn(sqlite3 * db) : active(false) {
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this->db = db;
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if (sqlite3_exec(db, "begin;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "starting transaction");
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active = true;
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}
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void commit()
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{
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if (sqlite3_exec(db, "commit;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "committing transaction");
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active = false;
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}
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~SQLiteTxn()
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{
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try {
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if (active && sqlite3_exec(db, "rollback;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "aborting transaction");
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} catch (...) {
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ignoreException();
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}
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}
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};
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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 = 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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{
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substitutablePathsLoaded = false;
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schemaPath = nixDBPath + "/schema";
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if (readOnlyMode) {
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openDB(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(nixStore);
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Path profilesDir = nixStateDir + "/profiles";
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createDirs(nixStateDir + "/profiles");
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createDirs(nixStateDir + "/temproots");
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Path gcRootsDir = nixStateDir + "/gcroots";
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if (!pathExists(gcRootsDir)) {
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createDirs(gcRootsDir);
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if (symlink(profilesDir.c_str(), (gcRootsDir + "/profiles").c_str()) == -1)
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throw SysError(format("creating symlink to `%1%'") % profilesDir);
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}
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checkStoreNotSymlink();
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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 = 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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readOnlyMode = true;
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openDB(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(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 (!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 < 6) upgradeStore6();
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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(false);
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}
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LocalStore::~LocalStore()
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{
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try {
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foreach (RunningSubstituters::iterator, i, runningSubstituters) {
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i->second.to.close();
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i->second.from.close();
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i->second.pid.wait(true);
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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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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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void LocalStore::openDB(bool create)
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{
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/* Open the Nix database. */
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if (sqlite3_open_v2((nixDBPath + "/db.sqlite").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("cannot open SQLite database");
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if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK)
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throw SQLiteError(db, "setting timeout");
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if (sqlite3_exec(db, "pragma foreign_keys = 1;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(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 = queryBoolSetting("fsync-metadata", true) ? "normal" : "off";
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if (sqlite3_exec(db, ("pragma synchronous = " + syncMode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "setting synchronous mode");
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/* Set the SQLite journal mode. WAL mode is fastest, but doesn't
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seem entirely stable at the moment (Oct. 2010). Thus, use
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truncate mode by default. */
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string mode = queryBoolSetting("use-sqlite-wal", false) ? "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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throw SQLiteError(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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throw SQLiteError(db, "setting journal mode");
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/* Increase the auto-checkpoint interval to 8192 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 (sqlite3_exec(db, "pragma wal_autocheckpoint = 8192;", 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "setting autocheckpoint interval");
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/* Initialise the database schema, if necessary. */
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if (create) {
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#include "schema.sql.hh"
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if (sqlite3_exec(db, (const char *) schema, 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "initialising database schema");
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}
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/* Backwards compatibility with old (pre-release) databases. Can
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remove this eventually. */
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if (sqlite3_table_column_metadata(db, 0, "ValidPaths", "narSize", 0, 0, 0, 0, 0) != SQLITE_OK) {
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if (sqlite3_exec(db, "alter table ValidPaths add column narSize integer" , 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "adding column narSize");
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}
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/* Prepare SQL statements. */
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stmtRegisterValidPath.create(db,
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"insert into ValidPaths (path, hash, registrationTime, deriver, narSize) values (?, ?, ?, ?, ?);");
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stmtAddReference.create(db,
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"insert or replace into Refs (referrer, reference) values (?, ?);");
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stmtQueryPathInfo.create(db,
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"select id, hash, registrationTime, deriver from ValidPaths where path = ?;");
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stmtQueryReferences.create(db,
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"select path from Refs join ValidPaths on reference = id where referrer = ?;");
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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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stmtInvalidatePath.create(db,
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"delete from ValidPaths where path = ?;");
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stmtRegisterFailedPath.create(db,
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"insert into FailedPaths (path, time) values (?, ?);");
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stmtHasPathFailed.create(db,
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"select time from FailedPaths where path = ?;");
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stmtQueryFailedPaths.create(db,
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"select path from FailedPaths;");
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stmtClearFailedPath.create(db,
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"delete from FailedPaths where ?1 = '*' or path = ?1;");
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stmtAddDerivationOutput.create(db,
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"insert or replace into DerivationOutputs (drv, id, path) values (?, ?, ?);");
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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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stmtQueryDerivationOutputs.create(db,
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"select id, path from DerivationOutputs where drv = ?;");
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}
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void canonicalisePathMetaData(const Path & path, bool recurse)
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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);
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/* Change ownership to the current uid. If it's a symlink, use
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lchown if available, otherwise don't bother. Wrong ownership
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of a symlink doesn't matter, since the owning user can't change
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the symlink and can't delete it because the directory is not
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writable. The only exception is top-level paths in the Nix
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store (since that directory is group-writable for the Nix build
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users group); we check for this case below. */
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if (st.st_uid != geteuid()) {
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#if HAVE_LCHOWN
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if (lchown(path.c_str(), geteuid(), (gid_t) -1) == -1)
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#else
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if (!S_ISLNK(st.st_mode) &&
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chown(path.c_str(), geteuid(), (gid_t) -1) == -1)
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#endif
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throw SysError(format("changing owner of `%1%' to %2%")
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% path % geteuid());
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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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if (st.st_mtime != 0) {
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struct utimbuf utimbuf;
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utimbuf.actime = st.st_atime;
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utimbuf.modtime = 1; /* 1 second into the epoch */
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if (utime(path.c_str(), &utimbuf) == -1)
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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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if (recurse && 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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canonicalisePathMetaData(path + "/" + *i, true);
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}
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}
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void canonicalisePathMetaData(const Path & path)
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{
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canonicalisePathMetaData(path, true);
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/* On platforms that don't have lchown(), the top-level path can't
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be a symlink, since we can't change its ownership. */
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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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if (st.st_uid != geteuid()) {
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assert(S_ISLNK(st.st_mode));
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throw Error(format("wrong ownership of top-level store path `%1%'") % path);
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}
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}
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unsigned long long LocalStore::addValidPath(const ValidPathInfo & info)
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{
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SQLiteStmtUse use(stmtRegisterValidPath);
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stmtRegisterValidPath.bind(info.path);
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stmtRegisterValidPath.bind("sha256:" + printHash(info.hash));
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stmtRegisterValidPath.bind(info.registrationTime);
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if (info.deriver != "")
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stmtRegisterValidPath.bind(info.deriver);
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else
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stmtRegisterValidPath.bind(); // null
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if (info.narSize != 0)
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stmtRegisterValidPath.bind(info.narSize);
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else
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stmtRegisterValidPath.bind(); // null
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if (sqlite3_step(stmtRegisterValidPath) != SQLITE_DONE)
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throw SQLiteError(db, format("registering valid path `%1%' in database") % info.path);
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unsigned long long id = sqlite3_last_insert_rowid(db);
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/* If this is a derivation, then store the derivation outputs in
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the database. This is useful for the garbage collector: it can
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efficiently query whether a path is an output of some
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derivation. */
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if (isDerivation(info.path)) {
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Derivation drv = parseDerivation(readFile(info.path));
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foreach (DerivationOutputs::iterator, i, drv.outputs) {
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SQLiteStmtUse use(stmtAddDerivationOutput);
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stmtAddDerivationOutput.bind(id);
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stmtAddDerivationOutput.bind(i->first);
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stmtAddDerivationOutput.bind(i->second.path);
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if (sqlite3_step(stmtAddDerivationOutput) != SQLITE_DONE)
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throw SQLiteError(db, format("adding derivation output for `%1%' in database") % info.path);
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}
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}
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return id;
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}
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void LocalStore::addReference(unsigned long long referrer, unsigned long long reference)
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{
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SQLiteStmtUse use(stmtAddReference);
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stmtAddReference.bind(referrer);
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stmtAddReference.bind(reference);
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if (sqlite3_step(stmtAddReference) != SQLITE_DONE)
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throw SQLiteError(db, "adding reference to database");
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}
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void LocalStore::registerValidPath(const ValidPathInfo & info)
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{
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assert(info.hash.type == htSHA256);
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ValidPathInfo info2(info);
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if (info2.registrationTime == 0) info2.registrationTime = time(0);
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SQLiteTxn txn(db);
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unsigned long long id = addValidPath(info2);
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foreach (PathSet::const_iterator, i, info2.references)
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addReference(id, queryValidPathId(*i));
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txn.commit();
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}
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void LocalStore::registerFailedPath(const Path & path)
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{
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if (hasPathFailed(path)) return;
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SQLiteStmtUse use(stmtRegisterFailedPath);
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stmtRegisterFailedPath.bind(path);
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stmtRegisterFailedPath.bind(time(0));
|
|
if (sqlite3_step(stmtRegisterFailedPath) != SQLITE_DONE)
|
|
throw SQLiteError(db, format("registering failed path `%1%'") % path);
|
|
}
|
|
|
|
|
|
bool LocalStore::hasPathFailed(const Path & path)
|
|
{
|
|
SQLiteStmtUse use(stmtHasPathFailed);
|
|
stmtHasPathFailed.bind(path);
|
|
int res = sqlite3_step(stmtHasPathFailed);
|
|
if (res != SQLITE_DONE && res != SQLITE_ROW)
|
|
throw SQLiteError(db, "querying whether path failed");
|
|
return res == SQLITE_ROW;
|
|
}
|
|
|
|
|
|
PathSet LocalStore::queryFailedPaths()
|
|
{
|
|
SQLiteStmtUse use(stmtQueryFailedPaths);
|
|
|
|
PathSet res;
|
|
int r;
|
|
while ((r = sqlite3_step(stmtQueryFailedPaths)) == SQLITE_ROW) {
|
|
const char * s = (const char *) sqlite3_column_text(stmtQueryFailedPaths, 0);
|
|
assert(s);
|
|
res.insert(s);
|
|
}
|
|
|
|
if (r != SQLITE_DONE)
|
|
throw SQLiteError(db, "error querying failed paths");
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
void LocalStore::clearFailedPaths(const PathSet & paths)
|
|
{
|
|
SQLiteTxn txn(db);
|
|
|
|
foreach (PathSet::const_iterator, i, paths) {
|
|
SQLiteStmtUse use(stmtClearFailedPath);
|
|
stmtClearFailedPath.bind(*i);
|
|
if (sqlite3_step(stmtClearFailedPath) != SQLITE_DONE)
|
|
throw SQLiteError(db, format("clearing failed path `%1%' in database") % *i);
|
|
}
|
|
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
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));
|
|
}
|
|
|
|
|
|
ValidPathInfo LocalStore::queryPathInfo(const Path & path)
|
|
{
|
|
ValidPathInfo info;
|
|
info.path = path;
|
|
|
|
assertStorePath(path);
|
|
|
|
/* Get the path info. */
|
|
SQLiteStmtUse use1(stmtQueryPathInfo);
|
|
|
|
stmtQueryPathInfo.bind(path);
|
|
|
|
int r = sqlite3_step(stmtQueryPathInfo);
|
|
if (r == SQLITE_DONE) throw Error(format("path `%1%' is not valid") % path);
|
|
if (r != SQLITE_ROW) throw SQLiteError(db, "querying path in database");
|
|
|
|
info.id = sqlite3_column_int(stmtQueryPathInfo, 0);
|
|
|
|
const char * s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 1);
|
|
assert(s);
|
|
info.hash = parseHashField(path, s);
|
|
|
|
info.registrationTime = sqlite3_column_int(stmtQueryPathInfo, 2);
|
|
|
|
s = (const char *) sqlite3_column_text(stmtQueryPathInfo, 3);
|
|
if (s) info.deriver = s;
|
|
|
|
/* Get the references. */
|
|
SQLiteStmtUse use2(stmtQueryReferences);
|
|
|
|
stmtQueryReferences.bind(info.id);
|
|
|
|
while ((r = sqlite3_step(stmtQueryReferences)) == SQLITE_ROW) {
|
|
s = (const char *) sqlite3_column_text(stmtQueryReferences, 0);
|
|
assert(s);
|
|
info.references.insert(s);
|
|
}
|
|
|
|
if (r != SQLITE_DONE)
|
|
throw SQLiteError(db, format("error getting references of `%1%'") % path);
|
|
|
|
return info;
|
|
}
|
|
|
|
|
|
unsigned long long LocalStore::queryValidPathId(const Path & path)
|
|
{
|
|
SQLiteStmtUse use(stmtQueryPathInfo);
|
|
stmtQueryPathInfo.bind(path);
|
|
int res = sqlite3_step(stmtQueryPathInfo);
|
|
if (res == SQLITE_ROW) return sqlite3_column_int(stmtQueryPathInfo, 0);
|
|
if (res == SQLITE_DONE) throw Error(format("path `%1%' is not valid") % path);
|
|
throw SQLiteError(db, "querying path in database");
|
|
}
|
|
|
|
|
|
bool LocalStore::isValidPath(const Path & path)
|
|
{
|
|
SQLiteStmtUse use(stmtQueryPathInfo);
|
|
stmtQueryPathInfo.bind(path);
|
|
int res = sqlite3_step(stmtQueryPathInfo);
|
|
if (res != SQLITE_DONE && res != SQLITE_ROW)
|
|
throw SQLiteError(db, "querying path in database");
|
|
return res == SQLITE_ROW;
|
|
}
|
|
|
|
|
|
PathSet LocalStore::queryValidPaths()
|
|
{
|
|
SQLiteStmt stmt;
|
|
stmt.create(db, "select path from ValidPaths");
|
|
|
|
PathSet res;
|
|
|
|
int r;
|
|
while ((r = sqlite3_step(stmt)) == SQLITE_ROW) {
|
|
const char * s = (const char *) sqlite3_column_text(stmt, 0);
|
|
assert(s);
|
|
res.insert(s);
|
|
}
|
|
|
|
if (r != SQLITE_DONE)
|
|
throw SQLiteError(db, "error getting valid paths");
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
void LocalStore::queryReferences(const Path & path,
|
|
PathSet & references)
|
|
{
|
|
ValidPathInfo info = queryPathInfo(path);
|
|
references.insert(info.references.begin(), info.references.end());
|
|
}
|
|
|
|
|
|
void LocalStore::queryReferrers(const Path & path, PathSet & referrers)
|
|
{
|
|
assertStorePath(path);
|
|
|
|
SQLiteStmtUse use(stmtQueryReferrers);
|
|
|
|
stmtQueryReferrers.bind(path);
|
|
|
|
int r;
|
|
while ((r = sqlite3_step(stmtQueryReferrers)) == SQLITE_ROW) {
|
|
const char * s = (const char *) sqlite3_column_text(stmtQueryReferrers, 0);
|
|
assert(s);
|
|
referrers.insert(s);
|
|
}
|
|
|
|
if (r != SQLITE_DONE)
|
|
throw SQLiteError(db, format("error getting references of `%1%'") % path);
|
|
}
|
|
|
|
|
|
Path LocalStore::queryDeriver(const Path & path)
|
|
{
|
|
return queryPathInfo(path).deriver;
|
|
}
|
|
|
|
|
|
PathSet LocalStore::queryValidDerivers(const Path & path)
|
|
{
|
|
assertStorePath(path);
|
|
|
|
SQLiteStmtUse use(stmtQueryValidDerivers);
|
|
stmtQueryValidDerivers.bind(path);
|
|
|
|
PathSet derivers;
|
|
int r;
|
|
while ((r = sqlite3_step(stmtQueryValidDerivers)) == SQLITE_ROW) {
|
|
const char * s = (const char *) sqlite3_column_text(stmtQueryValidDerivers, 1);
|
|
assert(s);
|
|
derivers.insert(s);
|
|
}
|
|
|
|
if (r != SQLITE_DONE)
|
|
throw SQLiteError(db, format("error getting valid derivers of `%1%'") % path);
|
|
|
|
return derivers;
|
|
}
|
|
|
|
|
|
PathSet LocalStore::queryDerivationOutputs(const Path & path)
|
|
{
|
|
SQLiteTxn txn(db);
|
|
|
|
SQLiteStmtUse use(stmtQueryDerivationOutputs);
|
|
stmtQueryDerivationOutputs.bind(queryValidPathId(path));
|
|
|
|
PathSet outputs;
|
|
int r;
|
|
while ((r = sqlite3_step(stmtQueryDerivationOutputs)) == SQLITE_ROW) {
|
|
const char * s = (const char *) sqlite3_column_text(stmtQueryDerivationOutputs, 1);
|
|
assert(s);
|
|
outputs.insert(s);
|
|
}
|
|
|
|
if (r != SQLITE_DONE)
|
|
throw SQLiteError(db, format("error getting outputs of `%1%'") % path);
|
|
|
|
return outputs;
|
|
}
|
|
|
|
|
|
void LocalStore::startSubstituter(const Path & substituter, RunningSubstituter & run)
|
|
{
|
|
if (run.pid != -1) return;
|
|
|
|
debug(format("starting substituter program `%1%'") % substituter);
|
|
|
|
Pipe toPipe, fromPipe;
|
|
|
|
toPipe.create();
|
|
fromPipe.create();
|
|
|
|
run.pid = fork();
|
|
|
|
switch (run.pid) {
|
|
|
|
case -1:
|
|
throw SysError("unable to fork");
|
|
|
|
case 0: /* child */
|
|
try {
|
|
/* Hack to let "make check" succeed on Darwin. The
|
|
libtool wrapper script sets DYLD_LIBRARY_PATH to our
|
|
libutil (among others), but Perl also depends on a
|
|
library named libutil. As a result, substituters
|
|
written in Perl (i.e. all of them) fail. */
|
|
unsetenv("DYLD_LIBRARY_PATH");
|
|
|
|
fromPipe.readSide.close();
|
|
toPipe.writeSide.close();
|
|
if (dup2(toPipe.readSide, STDIN_FILENO) == -1)
|
|
throw SysError("dupping stdin");
|
|
if (dup2(fromPipe.writeSide, STDOUT_FILENO) == -1)
|
|
throw SysError("dupping stdout");
|
|
closeMostFDs(set<int>());
|
|
execl(substituter.c_str(), substituter.c_str(), "--query", NULL);
|
|
throw SysError(format("executing `%1%'") % substituter);
|
|
} catch (std::exception & e) {
|
|
std::cerr << "error: " << e.what() << std::endl;
|
|
}
|
|
quickExit(1);
|
|
}
|
|
|
|
/* Parent. */
|
|
|
|
run.to = toPipe.writeSide.borrow();
|
|
run.from = fromPipe.readSide.borrow();
|
|
}
|
|
|
|
|
|
template<class T> T getIntLine(int fd)
|
|
{
|
|
string s = readLine(fd);
|
|
T res;
|
|
if (!string2Int(s, res)) throw Error("integer expected from stream");
|
|
return res;
|
|
}
|
|
|
|
|
|
bool LocalStore::hasSubstitutes(const Path & path)
|
|
{
|
|
foreach (Paths::iterator, i, substituters) {
|
|
RunningSubstituter & run(runningSubstituters[*i]);
|
|
startSubstituter(*i, run);
|
|
writeLine(run.to, "have\n" + path);
|
|
if (getIntLine<int>(run.from)) return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
bool LocalStore::querySubstitutablePathInfo(const Path & substituter,
|
|
const Path & path, SubstitutablePathInfo & info)
|
|
{
|
|
RunningSubstituter & run(runningSubstituters[substituter]);
|
|
startSubstituter(substituter, run);
|
|
|
|
writeLine(run.to, "info\n" + path);
|
|
|
|
if (!getIntLine<int>(run.from)) return false;
|
|
|
|
info.deriver = readLine(run.from);
|
|
if (info.deriver != "") assertStorePath(info.deriver);
|
|
int nrRefs = getIntLine<int>(run.from);
|
|
while (nrRefs--) {
|
|
Path p = readLine(run.from);
|
|
assertStorePath(p);
|
|
info.references.insert(p);
|
|
}
|
|
info.downloadSize = getIntLine<long long>(run.from);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool LocalStore::querySubstitutablePathInfo(const Path & path,
|
|
SubstitutablePathInfo & info)
|
|
{
|
|
foreach (Paths::iterator, i, substituters)
|
|
if (querySubstitutablePathInfo(*i, path, info)) return true;
|
|
return false;
|
|
}
|
|
|
|
|
|
Hash LocalStore::queryPathHash(const Path & path)
|
|
{
|
|
return queryPathInfo(path).hash;
|
|
}
|
|
|
|
|
|
void LocalStore::registerValidPaths(const ValidPathInfos & infos)
|
|
{
|
|
SQLiteTxn txn(db);
|
|
|
|
foreach (ValidPathInfos::const_iterator, i, infos)
|
|
/* !!! Maybe the registration info should be updated if the
|
|
path is already valid. */
|
|
if (!isValidPath(i->path)) addValidPath(*i);
|
|
|
|
foreach (ValidPathInfos::const_iterator, i, infos) {
|
|
unsigned long long referrer = queryValidPathId(i->path);
|
|
foreach (PathSet::iterator, j, i->references)
|
|
addReference(referrer, queryValidPathId(*j));
|
|
}
|
|
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
/* Invalidate a path. The caller is responsible for checking that
|
|
there are no referrers. */
|
|
void LocalStore::invalidatePath(const Path & path)
|
|
{
|
|
debug(format("invalidating path `%1%'") % path);
|
|
|
|
SQLiteStmtUse use(stmtInvalidatePath);
|
|
|
|
stmtInvalidatePath.bind(path);
|
|
|
|
if (sqlite3_step(stmtInvalidatePath) != SQLITE_DONE)
|
|
throw SQLiteError(db, format("invalidating path `%1%' in database") % path);
|
|
|
|
/* Note that the foreign key constraints on the Refs table take
|
|
care of deleting the references entries for `path'. */
|
|
}
|
|
|
|
|
|
Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
|
|
bool recursive, HashType hashAlgo)
|
|
{
|
|
Hash h = hashString(hashAlgo, dump);
|
|
|
|
Path dstPath = makeFixedOutputPath(recursive, hashAlgo, h, name);
|
|
|
|
addTempRoot(dstPath);
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
/* The first check above is an optimisation to prevent
|
|
unnecessary lock acquisition. */
|
|
|
|
PathLocks outputLock(singleton<PathSet, Path>(dstPath));
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
if (pathExists(dstPath)) deletePathWrapped(dstPath);
|
|
|
|
if (recursive) {
|
|
StringSource source(dump);
|
|
restorePath(dstPath, source);
|
|
} else
|
|
writeFile(dstPath, dump);
|
|
|
|
canonicalisePathMetaData(dstPath);
|
|
|
|
/* 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);
|
|
|
|
ValidPathInfo info;
|
|
info.path = dstPath;
|
|
info.hash = hash.first;
|
|
info.narSize = hash.second;
|
|
registerValidPath(info);
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
Path LocalStore::addToStore(const Path & _srcPath,
|
|
bool recursive, HashType hashAlgo, PathFilter & filter)
|
|
{
|
|
Path srcPath(absPath(_srcPath));
|
|
debug(format("adding `%1%' to the store") % 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 = readFile(srcPath);
|
|
|
|
return addToStoreFromDump(sink.s, baseNameOf(srcPath), recursive, hashAlgo);
|
|
}
|
|
|
|
|
|
Path LocalStore::addTextToStore(const string & name, const string & s,
|
|
const PathSet & references)
|
|
{
|
|
Path dstPath = computeStorePathForText(name, s, references);
|
|
|
|
addTempRoot(dstPath);
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
PathLocks outputLock(singleton<PathSet, Path>(dstPath));
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
if (pathExists(dstPath)) deletePathWrapped(dstPath);
|
|
|
|
writeFile(dstPath, s);
|
|
|
|
canonicalisePathMetaData(dstPath);
|
|
|
|
HashResult hash = hashPath(htSHA256, dstPath);
|
|
|
|
ValidPathInfo info;
|
|
info.path = dstPath;
|
|
info.hash = hash.first;
|
|
info.narSize = hash.second;
|
|
info.references = references;
|
|
registerValidPath(info);
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
struct HashAndWriteSink : Sink
|
|
{
|
|
Sink & writeSink;
|
|
HashSink hashSink;
|
|
HashAndWriteSink(Sink & writeSink) : writeSink(writeSink), hashSink(htSHA256)
|
|
{
|
|
}
|
|
virtual void operator ()
|
|
(const unsigned char * data, unsigned int len)
|
|
{
|
|
writeSink(data, len);
|
|
hashSink(data, len);
|
|
}
|
|
Hash currentHash()
|
|
{
|
|
HashSink hashSinkClone(hashSink);
|
|
return hashSinkClone.finish().first;
|
|
}
|
|
};
|
|
|
|
|
|
#define EXPORT_MAGIC 0x4558494e
|
|
|
|
|
|
static void checkSecrecy(const Path & path)
|
|
{
|
|
struct stat st;
|
|
if (stat(path.c_str(), &st))
|
|
throw SysError(format("getting status of `%1%'") % path);
|
|
if ((st.st_mode & (S_IRWXG | S_IRWXO)) != 0)
|
|
throw Error(format("file `%1%' should be secret (inaccessible to everybody else)!") % path);
|
|
}
|
|
|
|
|
|
void LocalStore::exportPath(const Path & path, bool sign,
|
|
Sink & sink)
|
|
{
|
|
assertStorePath(path);
|
|
|
|
addTempRoot(path);
|
|
if (!isValidPath(path))
|
|
throw Error(format("path `%1%' is not valid") % path);
|
|
|
|
HashAndWriteSink hashAndWriteSink(sink);
|
|
|
|
dumpPath(path, hashAndWriteSink);
|
|
|
|
/* Refuse to export paths that have changed. This prevents
|
|
filesystem corruption from spreading to other machines.
|
|
Don't complain if the stored hash is zero (unknown). */
|
|
Hash hash = hashAndWriteSink.currentHash();
|
|
Hash storedHash = queryPathHash(path);
|
|
if (hash != storedHash && storedHash != Hash(storedHash.type))
|
|
throw Error(format("hash of path `%1%' has changed from `%2%' to `%3%'!") % path
|
|
% printHash(storedHash) % printHash(hash));
|
|
|
|
writeInt(EXPORT_MAGIC, hashAndWriteSink);
|
|
|
|
writeString(path, hashAndWriteSink);
|
|
|
|
PathSet references;
|
|
queryReferences(path, references);
|
|
writeStringSet(references, hashAndWriteSink);
|
|
|
|
Path deriver = queryDeriver(path);
|
|
writeString(deriver, hashAndWriteSink);
|
|
|
|
if (sign) {
|
|
Hash hash = hashAndWriteSink.currentHash();
|
|
|
|
writeInt(1, hashAndWriteSink);
|
|
|
|
Path tmpDir = createTempDir();
|
|
AutoDelete delTmp(tmpDir);
|
|
Path hashFile = tmpDir + "/hash";
|
|
writeFile(hashFile, printHash(hash));
|
|
|
|
Path secretKey = nixConfDir + "/signing-key.sec";
|
|
checkSecrecy(secretKey);
|
|
|
|
Strings args;
|
|
args.push_back("rsautl");
|
|
args.push_back("-sign");
|
|
args.push_back("-inkey");
|
|
args.push_back(secretKey);
|
|
args.push_back("-in");
|
|
args.push_back(hashFile);
|
|
string signature = runProgram(OPENSSL_PATH, true, args);
|
|
|
|
writeString(signature, hashAndWriteSink);
|
|
|
|
} else
|
|
writeInt(0, hashAndWriteSink);
|
|
}
|
|
|
|
|
|
struct HashAndReadSource : Source
|
|
{
|
|
Source & readSource;
|
|
HashSink hashSink;
|
|
bool hashing;
|
|
HashAndReadSource(Source & readSource) : readSource(readSource), hashSink(htSHA256)
|
|
{
|
|
hashing = true;
|
|
}
|
|
virtual void operator ()
|
|
(unsigned char * data, unsigned int len)
|
|
{
|
|
readSource(data, len);
|
|
if (hashing) hashSink(data, len);
|
|
}
|
|
};
|
|
|
|
|
|
/* 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(nixStore);
|
|
addTempRoot(tmpDir);
|
|
} while (!pathExists(tmpDir));
|
|
return tmpDir;
|
|
}
|
|
|
|
|
|
Path LocalStore::importPath(bool requireSignature, Source & source)
|
|
{
|
|
HashAndReadSource hashAndReadSource(source);
|
|
|
|
/* We don't yet know what store path this archive contains (the
|
|
store path follows the archive data proper), and besides, we
|
|
don't know yet whether the signature is valid. */
|
|
Path tmpDir = createTempDirInStore();
|
|
AutoDelete delTmp(tmpDir);
|
|
Path unpacked = tmpDir + "/unpacked";
|
|
|
|
restorePath(unpacked, hashAndReadSource);
|
|
|
|
unsigned int magic = readInt(hashAndReadSource);
|
|
if (magic != EXPORT_MAGIC)
|
|
throw Error("Nix archive cannot be imported; wrong format");
|
|
|
|
Path dstPath = readStorePath(hashAndReadSource);
|
|
|
|
PathSet references = readStorePaths(hashAndReadSource);
|
|
|
|
Path deriver = readString(hashAndReadSource);
|
|
if (deriver != "") assertStorePath(deriver);
|
|
|
|
Hash hash = hashAndReadSource.hashSink.finish().first;
|
|
hashAndReadSource.hashing = false;
|
|
|
|
bool haveSignature = readInt(hashAndReadSource) == 1;
|
|
|
|
if (requireSignature && !haveSignature)
|
|
throw Error("imported archive lacks a signature");
|
|
|
|
if (haveSignature) {
|
|
string signature = readString(hashAndReadSource);
|
|
|
|
if (requireSignature) {
|
|
Path sigFile = tmpDir + "/sig";
|
|
writeFile(sigFile, signature);
|
|
|
|
Strings args;
|
|
args.push_back("rsautl");
|
|
args.push_back("-verify");
|
|
args.push_back("-inkey");
|
|
args.push_back(nixConfDir + "/signing-key.pub");
|
|
args.push_back("-pubin");
|
|
args.push_back("-in");
|
|
args.push_back(sigFile);
|
|
string hash2 = runProgram(OPENSSL_PATH, true, args);
|
|
|
|
/* Note: runProgram() throws an exception if the signature
|
|
is invalid. */
|
|
|
|
if (printHash(hash) != hash2)
|
|
throw Error(
|
|
"signed hash doesn't match actual contents of imported "
|
|
"archive; archive could be corrupt, or someone is trying "
|
|
"to import a Trojan horse");
|
|
}
|
|
}
|
|
|
|
/* Do the actual import. */
|
|
|
|
/* !!! way too much code duplication with addTextToStore() etc. */
|
|
addTempRoot(dstPath);
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
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(getEnv("NIX_HELD_LOCKS"));
|
|
if (find(locksHeld.begin(), locksHeld.end(), dstPath) == locksHeld.end())
|
|
outputLock.lockPaths(singleton<PathSet, Path>(dstPath));
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
if (pathExists(dstPath)) deletePathWrapped(dstPath);
|
|
|
|
if (rename(unpacked.c_str(), dstPath.c_str()) == -1)
|
|
throw SysError(format("cannot move `%1%' to `%2%'")
|
|
% unpacked % dstPath);
|
|
|
|
canonicalisePathMetaData(dstPath);
|
|
|
|
/* !!! if we were clever, we could prevent the hashPath()
|
|
here. */
|
|
HashResult hash = hashPath(htSHA256, dstPath);
|
|
|
|
ValidPathInfo info;
|
|
info.path = dstPath;
|
|
info.hash = hash.first;
|
|
info.narSize = hash.second;
|
|
info.references = references;
|
|
info.deriver = deriver != "" && isValidPath(deriver) ? deriver : "";
|
|
registerValidPath(info);
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
void LocalStore::deleteFromStore(const Path & path, unsigned long long & bytesFreed,
|
|
unsigned long long & blocksFreed)
|
|
{
|
|
bytesFreed = 0;
|
|
|
|
assertStorePath(path);
|
|
|
|
SQLiteTxn txn(db);
|
|
|
|
if (isValidPath(path)) {
|
|
PathSet referrers; queryReferrers(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(path);
|
|
}
|
|
|
|
deletePathWrapped(path, bytesFreed, blocksFreed);
|
|
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
void LocalStore::verifyStore(bool checkContents)
|
|
{
|
|
printMsg(lvlError, format("reading the Nix store..."));
|
|
|
|
/* Acquire the global GC lock to prevent a garbage collection. */
|
|
AutoCloseFD fdGCLock = openGCLock(ltWrite);
|
|
|
|
Paths entries = readDirectory(nixStore);
|
|
PathSet store(entries.begin(), entries.end());
|
|
|
|
/* Check whether all valid paths actually exist. */
|
|
printMsg(lvlInfo, "checking path existence...");
|
|
|
|
PathSet validPaths2 = queryValidPaths(), validPaths, done;
|
|
|
|
foreach (PathSet::iterator, i, validPaths2)
|
|
verifyPath(*i, store, done, validPaths);
|
|
|
|
/* Optionally, check the content hashes (slow). */
|
|
if (checkContents) {
|
|
printMsg(lvlInfo, "checking hashes...");
|
|
|
|
foreach (PathSet::iterator, i, validPaths) {
|
|
ValidPathInfo info = queryPathInfo(*i);
|
|
|
|
/* Check the content hash (optionally - slow). */
|
|
printMsg(lvlTalkative, format("checking contents of `%1%'") % *i);
|
|
Hash current = hashPath(info.hash.type, *i).first;
|
|
if (current != info.hash) {
|
|
printMsg(lvlError, format("path `%1%' was modified! "
|
|
"expected hash `%2%', got `%3%'")
|
|
% *i % printHash(info.hash) % printHash(current));
|
|
}
|
|
|
|
/* !!! Check info.narSize */
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void LocalStore::verifyPath(const Path & path, const PathSet & store,
|
|
PathSet & done, PathSet & validPaths)
|
|
{
|
|
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);
|
|
invalidatePath(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);
|
|
foreach (PathSet::iterator, i, referrers)
|
|
if (*i != path) {
|
|
verifyPath(*i, store, done, validPaths);
|
|
if (validPaths.find(*i) != validPaths.end())
|
|
canInvalidate = false;
|
|
}
|
|
|
|
if (canInvalidate) {
|
|
printMsg(lvlError, format("path `%1%' disappeared, removing from database...") % path);
|
|
invalidatePath(path);
|
|
} else
|
|
printMsg(lvlError, format("path `%1%' disappeared, but it still has valid referrers!") % path);
|
|
|
|
return;
|
|
}
|
|
|
|
validPaths.insert(path);
|
|
}
|
|
|
|
|
|
/* Functions for upgrading from the pre-SQLite database. */
|
|
|
|
PathSet LocalStore::queryValidPathsOld()
|
|
{
|
|
PathSet paths;
|
|
Strings entries = readDirectory(nixDBPath + "/info");
|
|
foreach (Strings::iterator, i, entries)
|
|
if (i->at(0) != '.') paths.insert(nixStore + "/" + *i);
|
|
return paths;
|
|
}
|
|
|
|
|
|
ValidPathInfo LocalStore::queryPathInfoOld(const Path & path)
|
|
{
|
|
ValidPathInfo res;
|
|
res.path = path;
|
|
|
|
/* Read the info file. */
|
|
string baseName = baseNameOf(path);
|
|
Path infoFile = (format("%1%/info/%2%") % nixDBPath % baseName).str();
|
|
if (!pathExists(infoFile))
|
|
throw Error(format("path `%1%' is not valid") % path);
|
|
string info = readFile(infoFile);
|
|
|
|
/* Parse it. */
|
|
Strings lines = tokenizeString(info, "\n");
|
|
|
|
foreach (Strings::iterator, i, lines) {
|
|
string::size_type p = i->find(':');
|
|
if (p == string::npos)
|
|
throw Error(format("corrupt line in `%1%': %2%") % infoFile % *i);
|
|
string name(*i, 0, p);
|
|
string value(*i, p + 2);
|
|
if (name == "References") {
|
|
Strings refs = tokenizeString(value, " ");
|
|
res.references = PathSet(refs.begin(), refs.end());
|
|
} else if (name == "Deriver") {
|
|
res.deriver = value;
|
|
} else if (name == "Hash") {
|
|
res.hash = parseHashField(path, value);
|
|
} else if (name == "Registered-At") {
|
|
int n = 0;
|
|
string2Int(value, n);
|
|
res.registrationTime = n;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/* Upgrade from schema 5 (Nix 0.12) to schema 6 (Nix >= 0.15). */
|
|
void LocalStore::upgradeStore6()
|
|
{
|
|
printMsg(lvlError, "upgrading Nix store to new schema (this may take a while)...");
|
|
|
|
openDB(true);
|
|
|
|
PathSet validPaths = queryValidPathsOld();
|
|
|
|
SQLiteTxn txn(db);
|
|
|
|
foreach (PathSet::iterator, i, validPaths) {
|
|
addValidPath(queryPathInfoOld(*i));
|
|
std::cerr << ".";
|
|
}
|
|
|
|
std::cerr << "|";
|
|
|
|
foreach (PathSet::iterator, i, validPaths) {
|
|
ValidPathInfo info = queryPathInfoOld(*i);
|
|
unsigned long long referrer = queryValidPathId(*i);
|
|
foreach (PathSet::iterator, j, info.references)
|
|
addReference(referrer, queryValidPathId(*j));
|
|
std::cerr << ".";
|
|
}
|
|
|
|
std::cerr << "\n";
|
|
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
}
|