diff options
Diffstat (limited to 'nix/libstore/local-store.cc')
| -rw-r--r-- | nix/libstore/local-store.cc | 2010 |
1 files changed, 2010 insertions, 0 deletions
diff --git a/nix/libstore/local-store.cc b/nix/libstore/local-store.cc new file mode 100644 index 0000000000..1293a6e8f2 --- /dev/null +++ b/nix/libstore/local-store.cc @@ -0,0 +1,2010 @@ +#include "config.h" +#include "local-store.hh" +#include "globals.hh" +#include "archive.hh" +#include "pathlocks.hh" +#include "worker-protocol.hh" +#include "derivations.hh" +#include "affinity.hh" + +#include <iostream> +#include <algorithm> +#include <cstring> + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <unistd.h> +#include <utime.h> +#include <fcntl.h> +#include <errno.h> +#include <stdio.h> +#include <time.h> + +#if HAVE_UNSHARE && HAVE_STATVFS && HAVE_SYS_MOUNT_H +#include <sched.h> +#include <sys/statvfs.h> +#include <sys/mount.h> +#endif + +#if HAVE_LINUX_FS_H +#include <linux/fs.h> +#include <sys/ioctl.h> +#include <errno.h> +#endif + +#include <sqlite3.h> + + +namespace nix { + + +MakeError(SQLiteError, Error); +MakeError(SQLiteBusy, SQLiteError); + + +static void throwSQLiteError(sqlite3 * db, const format & f) + __attribute__ ((noreturn)); + +static void throwSQLiteError(sqlite3 * db, const format & f) +{ + int err = sqlite3_errcode(db); + if (err == SQLITE_BUSY || err == SQLITE_PROTOCOL) { + if (err == SQLITE_PROTOCOL) + printMsg(lvlError, "warning: SQLite database is busy (SQLITE_PROTOCOL)"); + else { + static bool warned = false; + if (!warned) { + printMsg(lvlError, "warning: SQLite database is busy"); + warned = true; + } + } + /* Sleep for a while since retrying the transaction right away + is likely to fail again. */ +#if HAVE_NANOSLEEP + struct timespec t; + t.tv_sec = 0; + t.tv_nsec = (random() % 100) * 1000 * 1000; /* <= 0.1s */ + nanosleep(&t, 0); +#else + sleep(1); +#endif + throw SQLiteBusy(format("%1%: %2%") % f.str() % sqlite3_errmsg(db)); + } + else + throw SQLiteError(format("%1%: %2%") % f.str() % sqlite3_errmsg(db)); +} + + +/* Convenience macros for retrying a SQLite transaction. */ +#define retry_sqlite while (1) { try { +#define end_retry_sqlite break; } catch (SQLiteBusy & e) { } } + + +SQLite::~SQLite() +{ + try { + if (db && sqlite3_close(db) != SQLITE_OK) + throwSQLiteError(db, "closing database"); + } catch (...) { + ignoreException(); + } +} + + +void SQLiteStmt::create(sqlite3 * db, const string & s) +{ + checkInterrupt(); + assert(!stmt); + if (sqlite3_prepare_v2(db, s.c_str(), -1, &stmt, 0) != SQLITE_OK) + throwSQLiteError(db, "creating statement"); + this->db = db; +} + + +void SQLiteStmt::reset() +{ + assert(stmt); + /* Note: sqlite3_reset() returns the error code for the most + recent call to sqlite3_step(). So ignore it. */ + sqlite3_reset(stmt); + curArg = 1; +} + + +SQLiteStmt::~SQLiteStmt() +{ + try { + if (stmt && sqlite3_finalize(stmt) != SQLITE_OK) + throwSQLiteError(db, "finalizing statement"); + } catch (...) { + ignoreException(); + } +} + + +void SQLiteStmt::bind(const string & value) +{ + if (sqlite3_bind_text(stmt, curArg++, value.c_str(), -1, SQLITE_TRANSIENT) != SQLITE_OK) + throwSQLiteError(db, "binding argument"); +} + + +void SQLiteStmt::bind(int value) +{ + if (sqlite3_bind_int(stmt, curArg++, value) != SQLITE_OK) + throwSQLiteError(db, "binding argument"); +} + + +void SQLiteStmt::bind64(long long value) +{ + if (sqlite3_bind_int64(stmt, curArg++, value) != SQLITE_OK) + throwSQLiteError(db, "binding argument"); +} + + +void SQLiteStmt::bind() +{ + if (sqlite3_bind_null(stmt, curArg++) != SQLITE_OK) + throwSQLiteError(db, "binding argument"); +} + + +/* Helper class to ensure that prepared statements are reset when + leaving the scope that uses them. Unfinished prepared statements + prevent transactions from being aborted, and can cause locks to be + kept when they should be released. */ +struct SQLiteStmtUse +{ + SQLiteStmt & stmt; + SQLiteStmtUse(SQLiteStmt & stmt) : stmt(stmt) + { + stmt.reset(); + } + ~SQLiteStmtUse() + { + try { + stmt.reset(); + } catch (...) { + ignoreException(); + } + } +}; + + +struct SQLiteTxn +{ + bool active; + sqlite3 * db; + + SQLiteTxn(sqlite3 * db) : active(false) { + this->db = db; + if (sqlite3_exec(db, "begin;", 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "starting transaction"); + active = true; + } + + void commit() + { + if (sqlite3_exec(db, "commit;", 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "committing transaction"); + active = false; + } + + ~SQLiteTxn() + { + try { + if (active && sqlite3_exec(db, "rollback;", 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "aborting transaction"); + } catch (...) { + ignoreException(); + } + } +}; + + +void checkStoreNotSymlink() +{ + if (getEnv("NIX_IGNORE_SYMLINK_STORE") == "1") return; + Path path = settings.nixStore; + struct stat st; + while (path != "/") { + if (lstat(path.c_str(), &st)) + throw SysError(format("getting status of `%1%'") % path); + if (S_ISLNK(st.st_mode)) + throw Error(format( + "the path `%1%' is a symlink; " + "this is not allowed for the Nix store and its parent directories") + % path); + path = dirOf(path); + } +} + + +LocalStore::LocalStore(bool reserveSpace) + : didSetSubstituterEnv(false) +{ + schemaPath = settings.nixDBPath + "/schema"; + + if (settings.readOnlyMode) { + openDB(false); + return; + } + + /* Create missing state directories if they don't already exist. */ + createDirs(settings.nixStore); + makeStoreWritable(); + createDirs(linksDir = settings.nixStore + "/.links"); + Path profilesDir = settings.nixStateDir + "/profiles"; + createDirs(settings.nixStateDir + "/profiles"); + createDirs(settings.nixStateDir + "/temproots"); + createDirs(settings.nixDBPath); + Path gcRootsDir = settings.nixStateDir + "/gcroots"; + if (!pathExists(gcRootsDir)) { + createDirs(gcRootsDir); + createSymlink(profilesDir, gcRootsDir + "/profiles"); + } + + checkStoreNotSymlink(); + + /* We can't open a SQLite database if the disk is full. Since + this prevents the garbage collector from running when it's most + needed, we reserve some dummy space that we can free just + before doing a garbage collection. */ + try { + Path reservedPath = settings.nixDBPath + "/reserved"; + if (reserveSpace) { + struct stat st; + if (stat(reservedPath.c_str(), &st) == -1 || + st.st_size != settings.reservedSize) + writeFile(reservedPath, string(settings.reservedSize, 'X')); + } + else + deletePath(reservedPath); + } catch (SysError & e) { /* don't care about errors */ + } + + /* Acquire the big fat lock in shared mode to make sure that no + schema upgrade is in progress. */ + try { + Path globalLockPath = settings.nixDBPath + "/big-lock"; + globalLock = openLockFile(globalLockPath.c_str(), true); + } catch (SysError & e) { + if (e.errNo != EACCES) throw; + settings.readOnlyMode = true; + openDB(false); + return; + } + + if (!lockFile(globalLock, ltRead, false)) { + printMsg(lvlError, "waiting for the big Nix store lock..."); + lockFile(globalLock, ltRead, true); + } + + /* Check the current database schema and if necessary do an + upgrade. */ + int curSchema = getSchema(); + if (curSchema > nixSchemaVersion) + throw Error(format("current Nix store schema is version %1%, but I only support %2%") + % curSchema % nixSchemaVersion); + + else if (curSchema == 0) { /* new store */ + curSchema = nixSchemaVersion; + openDB(true); + writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str()); + } + + else if (curSchema < nixSchemaVersion) { + if (curSchema < 5) + throw Error( + "Your Nix store has a database in Berkeley DB format,\n" + "which is no longer supported. To convert to the new format,\n" + "please upgrade Nix to version 0.12 first."); + + if (!lockFile(globalLock, ltWrite, false)) { + printMsg(lvlError, "waiting for exclusive access to the Nix store..."); + lockFile(globalLock, ltWrite, true); + } + + /* Get the schema version again, because another process may + have performed the upgrade already. */ + curSchema = getSchema(); + + if (curSchema < 6) upgradeStore6(); + else if (curSchema < 7) { upgradeStore7(); openDB(true); } + + writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str()); + + lockFile(globalLock, ltRead, true); + } + + else openDB(false); +} + + +LocalStore::~LocalStore() +{ + try { + foreach (RunningSubstituters::iterator, i, runningSubstituters) { + if (i->second.disabled) continue; + i->second.to.close(); + i->second.from.close(); + i->second.error.close(); + i->second.pid.wait(true); + } + } catch (...) { + ignoreException(); + } +} + + +int LocalStore::getSchema() +{ + int curSchema = 0; + if (pathExists(schemaPath)) { + string s = readFile(schemaPath); + if (!string2Int(s, curSchema)) + throw Error(format("`%1%' is corrupt") % schemaPath); + } + return curSchema; +} + + +void LocalStore::openDB(bool create) +{ + if (access(settings.nixDBPath.c_str(), R_OK | W_OK)) + throw SysError(format("Nix database directory `%1%' is not writable") % settings.nixDBPath); + + /* Open the Nix database. */ + string dbPath = settings.nixDBPath + "/db.sqlite"; + if (sqlite3_open_v2(dbPath.c_str(), &db.db, + SQLITE_OPEN_READWRITE | (create ? SQLITE_OPEN_CREATE : 0), 0) != SQLITE_OK) + throw Error(format("cannot open Nix database `%1%'") % dbPath); + + if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK) + throwSQLiteError(db, "setting timeout"); + + if (sqlite3_exec(db, "pragma foreign_keys = 1;", 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "enabling foreign keys"); + + /* !!! check whether sqlite has been built with foreign key + support */ + + /* Whether SQLite should fsync(). "Normal" synchronous mode + should be safe enough. If the user asks for it, don't sync at + all. This can cause database corruption if the system + crashes. */ + string syncMode = settings.fsyncMetadata ? "normal" : "off"; + if (sqlite3_exec(db, ("pragma synchronous = " + syncMode + ";").c_str(), 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "setting synchronous mode"); + + /* Set the SQLite journal mode. WAL mode is fastest, so it's the + default. */ + string mode = settings.useSQLiteWAL ? "wal" : "truncate"; + string prevMode; + { + SQLiteStmt stmt; + stmt.create(db, "pragma main.journal_mode;"); + if (sqlite3_step(stmt) != SQLITE_ROW) + throwSQLiteError(db, "querying journal mode"); + prevMode = string((const char *) sqlite3_column_text(stmt, 0)); + } + if (prevMode != mode && + sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "setting journal mode"); + + /* Increase the auto-checkpoint interval to 40000 pages. This + seems enough to ensure that instantiating the NixOS system + derivation is done in a single fsync(). */ + if (mode == "wal" && sqlite3_exec(db, "pragma wal_autocheckpoint = 40000;", 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "setting autocheckpoint interval"); + + /* Initialise the database schema, if necessary. */ + if (create) { + const char * schema = +#include "schema.sql.hh" + ; + if (sqlite3_exec(db, (const char *) schema, 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "initialising database schema"); + } + + /* Prepare SQL statements. */ + stmtRegisterValidPath.create(db, + "insert into ValidPaths (path, hash, registrationTime, deriver, narSize) values (?, ?, ?, ?, ?);"); + stmtUpdatePathInfo.create(db, + "update ValidPaths set narSize = ?, hash = ? where path = ?;"); + stmtAddReference.create(db, + "insert or replace into Refs (referrer, reference) values (?, ?);"); + stmtQueryPathInfo.create(db, + "select id, hash, registrationTime, deriver, narSize from ValidPaths where path = ?;"); + stmtQueryReferences.create(db, + "select path from Refs join ValidPaths on reference = id where referrer = ?;"); + stmtQueryReferrers.create(db, + "select path from Refs join ValidPaths on referrer = id where reference = (select id from ValidPaths where path = ?);"); + stmtInvalidatePath.create(db, + "delete from ValidPaths where path = ?;"); + stmtRegisterFailedPath.create(db, + "insert or ignore into FailedPaths (path, time) values (?, ?);"); + stmtHasPathFailed.create(db, + "select time from FailedPaths where path = ?;"); + stmtQueryFailedPaths.create(db, + "select path from FailedPaths;"); + // If the path is a derivation, then clear its outputs. + stmtClearFailedPath.create(db, + "delete from FailedPaths where ?1 = '*' or path = ?1 " + "or path in (select d.path from DerivationOutputs d join ValidPaths v on d.drv = v.id where v.path = ?1);"); + stmtAddDerivationOutput.create(db, + "insert or replace into DerivationOutputs (drv, id, path) values (?, ?, ?);"); + stmtQueryValidDerivers.create(db, + "select v.id, v.path from DerivationOutputs d join ValidPaths v on d.drv = v.id where d.path = ?;"); + stmtQueryDerivationOutputs.create(db, + "select id, path from DerivationOutputs where drv = ?;"); + // Use "path >= ?" with limit 1 rather than "path like '?%'" to + // ensure efficient lookup. + stmtQueryPathFromHashPart.create(db, + "select path from ValidPaths where path >= ? limit 1;"); +} + + +/* To improve purity, users may want to make the Nix store a read-only + bind mount. So make the Nix store writable for this process. */ +void LocalStore::makeStoreWritable() +{ +#if HAVE_UNSHARE && HAVE_STATVFS && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(MS_REMOUNT) + if (getuid() != 0) return; + /* Check if /nix/store is on a read-only mount. */ + struct statvfs stat; + if (statvfs(settings.nixStore.c_str(), &stat) != 0) + throw SysError("getting info about the Nix store mount point"); + + if (stat.f_flag & ST_RDONLY) { + if (unshare(CLONE_NEWNS) == -1) + throw SysError("setting up a private mount namespace"); + + if (mount(0, settings.nixStore.c_str(), 0, MS_REMOUNT | MS_BIND, 0) == -1) + throw SysError(format("remounting %1% writable") % settings.nixStore); + } +#endif +} + + +const time_t mtimeStore = 1; /* 1 second into the epoch */ + + +static void canonicaliseTimestampAndPermissions(const Path & path, const struct stat & st) +{ + if (!S_ISLNK(st.st_mode)) { + + /* Mask out all type related bits. */ + mode_t mode = st.st_mode & ~S_IFMT; + + if (mode != 0444 && mode != 0555) { + mode = (st.st_mode & S_IFMT) + | 0444 + | (st.st_mode & S_IXUSR ? 0111 : 0); + if (chmod(path.c_str(), mode) == -1) + throw SysError(format("changing mode of `%1%' to %2$o") % path % mode); + } + + } + + if (st.st_mtime != mtimeStore) { + struct timeval times[2]; + times[0].tv_sec = st.st_atime; + times[0].tv_usec = 0; + times[1].tv_sec = mtimeStore; + times[1].tv_usec = 0; +#if HAVE_LUTIMES + if (lutimes(path.c_str(), times) == -1) + if (errno != ENOSYS || + (!S_ISLNK(st.st_mode) && utimes(path.c_str(), times) == -1)) +#else + if (!S_ISLNK(st.st_mode) && utimes(path.c_str(), times) == -1) +#endif + throw SysError(format("changing modification time of `%1%'") % path); + } +} + + +void canonicaliseTimestampAndPermissions(const Path & path) +{ + struct stat st; + if (lstat(path.c_str(), &st)) + throw SysError(format("getting attributes of path `%1%'") % path); + canonicaliseTimestampAndPermissions(path, st); +} + + +static void canonicalisePathMetaData_(const Path & path, uid_t fromUid, InodesSeen & inodesSeen) +{ + checkInterrupt(); + + struct stat st; + if (lstat(path.c_str(), &st)) + throw SysError(format("getting attributes of path `%1%'") % path); + + /* Really make sure that the path is of a supported type. This + has already been checked in dumpPath(). */ + assert(S_ISREG(st.st_mode) || S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)); + + /* Fail if the file is not owned by the build user. This prevents + us from messing up the ownership/permissions of files + 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) { + assert(!S_ISDIR(st.st_mode)); + if (inodesSeen.find(Inode(st.st_dev, st.st_ino)) == inodesSeen.end()) + throw BuildError(format("invalid ownership on file `%1%'") % path); + mode_t mode = st.st_mode & ~S_IFMT; + assert(S_ISLNK(st.st_mode) || (st.st_uid == geteuid() && (mode == 0444 || mode == 0555) && st.st_mtime == mtimeStore)); + 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(), (gid_t) -1) == -1) +#else + if (!S_ISLNK(st.st_mode) && + chown(path.c_str(), geteuid(), (gid_t) -1) == -1) +#endif + throw SysError(format("changing owner of `%1%' to %2%") + % path % geteuid()); + } + + if (S_ISDIR(st.st_mode)) { + Strings names = readDirectory(path); + foreach (Strings::iterator, i, names) + canonicalisePathMetaData_(path + "/" + *i, 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 (isFixedOutputDrv(drv)) { + 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); + foreach (DerivationOutputs::iterator, i, drvCopy.outputs) { + i->second.path = ""; + drvCopy.env[i->first] = ""; + } + + Hash h = hashDerivationModulo(*this, drvCopy); + + foreach (DerivationOutputs::const_iterator, 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); + } + } +} + + +unsigned long long LocalStore::addValidPath(const ValidPathInfo & info, bool checkOutputs) +{ + SQLiteStmtUse use(stmtRegisterValidPath); + stmtRegisterValidPath.bind(info.path); + stmtRegisterValidPath.bind("sha256:" + printHash(info.hash)); + stmtRegisterValidPath.bind(info.registrationTime == 0 ? time(0) : info.registrationTime); + if (info.deriver != "") + stmtRegisterValidPath.bind(info.deriver); + else + stmtRegisterValidPath.bind(); // null + if (info.narSize != 0) + stmtRegisterValidPath.bind64(info.narSize); + else + stmtRegisterValidPath.bind(); // null + if (sqlite3_step(stmtRegisterValidPath) != SQLITE_DONE) + throwSQLiteError(db, format("registering valid path `%1%' in database") % info.path); + unsigned long long id = sqlite3_last_insert_rowid(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 = parseDerivation(readFile(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); + + foreach (DerivationOutputs::iterator, i, drv.outputs) { + SQLiteStmtUse use(stmtAddDerivationOutput); + stmtAddDerivationOutput.bind(id); + stmtAddDerivationOutput.bind(i->first); + stmtAddDerivationOutput.bind(i->second.path); + if (sqlite3_step(stmtAddDerivationOutput) != SQLITE_DONE) + throwSQLiteError(db, format("adding derivation output for `%1%' in database") % info.path); + } + } + + return id; +} + + +void LocalStore::addReference(unsigned long long referrer, unsigned long long reference) +{ + SQLiteStmtUse use(stmtAddReference); + stmtAddReference.bind(referrer); + stmtAddReference.bind(reference); + if (sqlite3_step(stmtAddReference) != SQLITE_DONE) + throwSQLiteError(db, "adding reference to database"); +} + + +void LocalStore::registerFailedPath(const Path & path) +{ + retry_sqlite { + SQLiteStmtUse use(stmtRegisterFailedPath); + stmtRegisterFailedPath.bind(path); + stmtRegisterFailedPath.bind(time(0)); + if (sqlite3_step(stmtRegisterFailedPath) != SQLITE_DONE) + throwSQLiteError(db, format("registering failed path `%1%'") % path); + } end_retry_sqlite; +} + + +bool LocalStore::hasPathFailed(const Path & path) +{ + retry_sqlite { + SQLiteStmtUse use(stmtHasPathFailed); + stmtHasPathFailed.bind(path); + int res = sqlite3_step(stmtHasPathFailed); + if (res != SQLITE_DONE && res != SQLITE_ROW) + throwSQLiteError(db, "querying whether path failed"); + return res == SQLITE_ROW; + } end_retry_sqlite; +} + + +PathSet LocalStore::queryFailedPaths() +{ + retry_sqlite { + 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) + throwSQLiteError(db, "error querying failed paths"); + + return res; + } end_retry_sqlite; +} + + +void LocalStore::clearFailedPaths(const PathSet & paths) +{ + retry_sqlite { + SQLiteTxn txn(db); + + foreach (PathSet::const_iterator, i, paths) { + SQLiteStmtUse use(stmtClearFailedPath); + stmtClearFailedPath.bind(*i); + if (sqlite3_step(stmtClearFailedPath) != SQLITE_DONE) + throwSQLiteError(db, format("clearing failed path `%1%' in database") % *i); + } + + txn.commit(); + } end_retry_sqlite; +} + + +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); + + retry_sqlite { + + /* 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) throwSQLiteError(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; + + /* Note that narSize = NULL yields 0. */ + info.narSize = sqlite3_column_int64(stmtQueryPathInfo, 4); + + /* 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) + throwSQLiteError(db, format("error getting references of `%1%'") % path); + + return info; + } end_retry_sqlite; +} + + +/* Update path info in the database. Currently only updates the + narSize field. */ +void LocalStore::updatePathInfo(const ValidPathInfo & info) +{ + SQLiteStmtUse use(stmtUpdatePathInfo); + if (info.narSize != 0) + stmtUpdatePathInfo.bind64(info.narSize); + else + stmtUpdatePathInfo.bind(); // null + stmtUpdatePathInfo.bind("sha256:" + printHash(info.hash)); + stmtUpdatePathInfo.bind(info.path); + if (sqlite3_step(stmtUpdatePathInfo) != SQLITE_DONE) + throwSQLiteError(db, format("updating info of path `%1%' in database") % info.path); +} + + +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); + throwSQLiteError(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) + throwSQLiteError(db, "querying path in database"); + return res == SQLITE_ROW; +} + + +bool LocalStore::isValidPath(const Path & path) +{ + retry_sqlite { + return isValidPath_(path); + } end_retry_sqlite; +} + + +PathSet LocalStore::queryValidPaths(const PathSet & paths) +{ + retry_sqlite { + PathSet res; + foreach (PathSet::const_iterator, i, paths) + if (isValidPath_(*i)) res.insert(*i); + return res; + } end_retry_sqlite; +} + + +PathSet LocalStore::queryAllValidPaths() +{ + retry_sqlite { + 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) + throwSQLiteError(db, "error getting valid paths"); + + return res; + } end_retry_sqlite; +} + + +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) +{ + 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) + throwSQLiteError(db, format("error getting references of `%1%'") % path); +} + + +void LocalStore::queryReferrers(const Path & path, PathSet & referrers) +{ + assertStorePath(path); + retry_sqlite { + queryReferrers_(path, referrers); + } end_retry_sqlite; +} + + +Path LocalStore::queryDeriver(const Path & path) +{ + return queryPathInfo(path).deriver; +} + + +PathSet LocalStore::queryValidDerivers(const Path & path) +{ + assertStorePath(path); + + retry_sqlite { + 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) + throwSQLiteError(db, format("error getting valid derivers of `%1%'") % path); + + return derivers; + } end_retry_sqlite; +} + + +PathSet LocalStore::queryDerivationOutputs(const Path & path) +{ + retry_sqlite { + 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) + throwSQLiteError(db, format("error getting outputs of `%1%'") % path); + + return outputs; + } end_retry_sqlite; +} + + +StringSet LocalStore::queryDerivationOutputNames(const Path & path) +{ + retry_sqlite { + SQLiteStmtUse use(stmtQueryDerivationOutputs); + stmtQueryDerivationOutputs.bind(queryValidPathId(path)); + + StringSet outputNames; + int r; + while ((r = sqlite3_step(stmtQueryDerivationOutputs)) == SQLITE_ROW) { + const char * s = (const char *) sqlite3_column_text(stmtQueryDerivationOutputs, 0); + assert(s); + outputNames.insert(s); + } + + if (r != SQLITE_DONE) + throwSQLiteError(db, format("error getting output names of `%1%'") % path); + + return outputNames; + } end_retry_sqlite; +} + + +Path LocalStore::queryPathFromHashPart(const string & hashPart) +{ + if (hashPart.size() != 32) throw Error("invalid hash part"); + + Path prefix = settings.nixStore + "/" + hashPart; + + retry_sqlite { + SQLiteStmtUse use(stmtQueryPathFromHashPart); + stmtQueryPathFromHashPart.bind(prefix); + + int res = sqlite3_step(stmtQueryPathFromHashPart); + if (res == SQLITE_DONE) return ""; + if (res != SQLITE_ROW) throwSQLiteError(db, "finding path in database"); + + const char * s = (const char *) sqlite3_column_text(stmtQueryPathFromHashPart, 0); + return s && prefix.compare(0, prefix.size(), s, prefix.size()) == 0 ? s : ""; + } end_retry_sqlite; +} + + +void LocalStore::setSubstituterEnv() +{ + if (didSetSubstituterEnv) return; + + /* Pass configuration options (including those overridden with + --option) to substituters. */ + setenv("_NIX_OPTIONS", settings.pack().c_str(), 1); + + didSetSubstituterEnv = true; +} + + +void LocalStore::startSubstituter(const Path & substituter, RunningSubstituter & run) +{ + if (run.disabled || run.pid != -1) return; + + debug(format("starting substituter program `%1%'") % substituter); + + Pipe toPipe, fromPipe, errorPipe; + + toPipe.create(); + fromPipe.create(); + errorPipe.create(); + + setSubstituterEnv(); + + run.pid = maybeVfork(); + + switch (run.pid) { + + case -1: + throw SysError("unable to fork"); + + case 0: /* child */ + try { + restoreAffinity(); + if (dup2(toPipe.readSide, STDIN_FILENO) == -1) + throw SysError("dupping stdin"); + if (dup2(fromPipe.writeSide, STDOUT_FILENO) == -1) + throw SysError("dupping stdout"); + if (dup2(errorPipe.writeSide, STDERR_FILENO) == -1) + throw SysError("dupping stderr"); + 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; + } + _exit(1); + } + + /* Parent. */ + + run.program = baseNameOf(substituter); + run.to = toPipe.writeSide.borrow(); + run.from = run.fromBuf.fd = fromPipe.readSide.borrow(); + run.error = errorPipe.readSide.borrow(); + + toPipe.readSide.close(); + fromPipe.writeSide.close(); + errorPipe.writeSide.close(); + + /* The substituter may exit right away if it's disabled in any way + (e.g. copy-from-other-stores.pl will exit if no other stores + are configured). */ + try { + getLineFromSubstituter(run); + } catch (EndOfFile & e) { + run.to.close(); + run.from.close(); + run.error.close(); + run.disabled = true; + if (run.pid.wait(true) != 0) throw; + } +} + + +/* Read a line from the substituter's stdout, while also processing + its stderr. */ +string LocalStore::getLineFromSubstituter(RunningSubstituter & run) +{ + string res, err; + + /* We might have stdout data left over from the last time. */ + if (run.fromBuf.hasData()) goto haveData; + + while (1) { + checkInterrupt(); + + fd_set fds; + FD_ZERO(&fds); + FD_SET(run.from, &fds); + FD_SET(run.error, &fds); + + /* Wait for data to appear on the substituter's stdout or + stderr. */ + if (select(run.from > run.error ? run.from + 1 : run.error + 1, &fds, 0, 0, 0) == -1) { + if (errno == EINTR) continue; + throw SysError("waiting for input from the substituter"); + } + + /* Completely drain stderr before dealing with stdout. */ + if (FD_ISSET(run.error, &fds)) { + char buf[4096]; + ssize_t n = read(run.error, (unsigned char *) buf, sizeof(buf)); + if (n == -1) { + if (errno == EINTR) continue; + throw SysError("reading from substituter's stderr"); + } + if (n == 0) throw EndOfFile(format("substituter `%1%' died unexpectedly") % run.program); + err.append(buf, n); + string::size_type p; + while ((p = err.find('\n')) != string::npos) { + printMsg(lvlError, run.program + ": " + string(err, 0, p)); + err = string(err, p + 1); + } + } + + /* Read from stdout until we get a newline or the buffer is empty. */ + else if (run.fromBuf.hasData() || FD_ISSET(run.from, &fds)) { + haveData: + do { + unsigned char c; + run.fromBuf(&c, 1); + if (c == '\n') { + if (!err.empty()) printMsg(lvlError, run.program + ": " + err); + return res; + } + res += c; + } while (run.fromBuf.hasData()); + } + } +} + + +template<class T> T LocalStore::getIntLineFromSubstituter(RunningSubstituter & run) +{ + string s = getLineFromSubstituter(run); + T res; + if (!string2Int(s, res)) throw Error("integer expected from stream"); + return res; +} + + +PathSet LocalStore::querySubstitutablePaths(const PathSet & paths) +{ + PathSet res; + foreach (Paths::iterator, i, settings.substituters) { + if (res.size() == paths.size()) break; + RunningSubstituter & run(runningSubstituters[*i]); + startSubstituter(*i, run); + if (run.disabled) continue; + string s = "have "; + foreach (PathSet::const_iterator, j, paths) + if (res.find(*j) == res.end()) { s += *j; s += " "; } + writeLine(run.to, s); + while (true) { + /* FIXME: we only read stderr when an error occurs, so + substituters should only write (short) messages to + stderr when they fail. I.e. they shouldn't write debug + output. */ + Path path = getLineFromSubstituter(run); + if (path == "") break; + res.insert(path); + } + } + return res; +} + + +void LocalStore::querySubstitutablePathInfos(const Path & substituter, + PathSet & paths, SubstitutablePathInfos & infos) +{ + RunningSubstituter & run(runningSubstituters[substituter]); + startSubstituter(substituter, run); + if (run.disabled) return; + + string s = "info "; + foreach (PathSet::const_iterator, i, paths) + if (infos.find(*i) == infos.end()) { s += *i; s += " "; } + writeLine(run.to, s); + + while (true) { + Path path = getLineFromSubstituter(run); + if (path == "") break; + if (paths.find(path) == paths.end()) + throw Error(format("got unexpected path `%1%' from substituter") % path); + paths.erase(path); + SubstitutablePathInfo & info(infos[path]); + info.deriver = getLineFromSubstituter(run); + if (info.deriver != "") assertStorePath(info.deriver); + int nrRefs = getIntLineFromSubstituter<int>(run); + while (nrRefs--) { + Path p = getLineFromSubstituter(run); + assertStorePath(p); + info.references.insert(p); + } + info.downloadSize = getIntLineFromSubstituter<long long>(run); + info.narSize = getIntLineFromSubstituter<long long>(run); + } +} + + +void LocalStore::querySubstitutablePathInfos(const PathSet & paths, + SubstitutablePathInfos & infos) +{ + PathSet todo = paths; + foreach (Paths::iterator, i, settings.substituters) { + if (todo.empty()) break; + querySubstitutablePathInfos(*i, todo, infos); + } +} + + +Hash LocalStore::queryPathHash(const Path & path) +{ + return queryPathInfo(path).hash; +} + + +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(); + + retry_sqlite { + SQLiteTxn txn(db); + PathSet paths; + + foreach (ValidPathInfos::const_iterator, i, infos) { + assert(i->hash.type == htSHA256); + if (isValidPath_(i->path)) + updatePathInfo(*i); + else + addValidPath(*i, false); + paths.insert(i->path); + } + + foreach (ValidPathInfos::const_iterator, i, infos) { + unsigned long long referrer = queryValidPathId(i->path); + foreach (PathSet::iterator, j, i->references) + addReference(referrer, queryValidPathId(*j)); + } + + /* Check that the derivation outputs are correct. We can't do + this in addValidPath() above, because the references might + not be valid yet. */ + foreach (ValidPathInfos::const_iterator, i, infos) + if (isDerivation(i->path)) { + // FIXME: inefficient; we already loaded the + // derivation in addValidPath(). + Derivation drv = parseDerivation(readFile(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(*this, paths); + + txn.commit(); + } end_retry_sqlite; +} + + +/* 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); + + drvHashes.erase(path); + + SQLiteStmtUse use(stmtInvalidatePath); + + stmtInvalidatePath.bind(path); + + if (sqlite3_step(stmtInvalidatePath) != SQLITE_DONE) + throwSQLiteError(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, 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(singleton<PathSet, Path>(dstPath)); + + if (repair || !isValidPath(dstPath)) { + + if (pathExists(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.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, bool repair) +{ + 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, 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(singleton<PathSet, Path>(dstPath)); + + if (repair || !isValidPath(dstPath)) { + + if (pathExists(dstPath)) deletePath(dstPath); + + writeFile(dstPath, s); + + canonicalisePathMetaData(dstPath, -1); + + HashResult hash = hashPath(htSHA256, dstPath); + + optimisePath(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, size_t len) + { + writeSink(data, len); + hashSink(data, len); + } + Hash currentHash() + { + return hashSink.currentHash().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); + writeStrings(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 = settings.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; + } + size_t read(unsigned char * data, size_t len) + { + size_t n = readSource.read(data, len); + if (hashing) hashSink(data, n); + return n; + } +}; + + +/* 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; +} + + +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); + + printMsg(lvlInfo, format("importing path `%1%'") % dstPath); + + PathSet references = readStorePaths<PathSet>(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(format("imported archive of `%1%' lacks a signature") % dstPath); + + 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(settings.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<Strings>(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)) deletePath(dstPath); + + if (rename(unpacked.c_str(), dstPath.c_str()) == -1) + throw SysError(format("cannot move `%1%' to `%2%'") + % unpacked % dstPath); + + canonicalisePathMetaData(dstPath, -1); + + /* !!! if we were clever, we could prevent the hashPath() + here. */ + HashResult hash = hashPath(htSHA256, dstPath); + + optimisePath(dstPath); // FIXME: combine with hashPath() + + 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; +} + + +Paths LocalStore::importPaths(bool requireSignature, Source & source) +{ + Paths res; + while (true) { + unsigned long long n = readLongLong(source); + if (n == 0) break; + if (n != 1) throw Error("input doesn't look like something created by `nix-store --export'"); + res.push_back(importPath(requireSignature, source)); + } + return res; +} + + +void LocalStore::invalidatePathChecked(const Path & path) +{ + assertStorePath(path); + + retry_sqlite { + 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); + } + + txn.commit(); + } end_retry_sqlite; +} + + +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); + + Paths entries = readDirectory(settings.nixStore); + PathSet store(entries.begin(), entries.end()); + + /* Check whether all valid paths actually exist. */ + printMsg(lvlInfo, "checking path existence..."); + + PathSet validPaths2 = queryAllValidPaths(), validPaths, done; + + foreach (PathSet::iterator, 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); + + foreach (PathSet::iterator, i, validPaths) { + try { + ValidPathInfo info = queryPathInfo(*i); + + /* Check the content hash (optionally - slow). */ + printMsg(lvlTalkative, format("checking contents of `%1%'") % *i); + HashResult current = hashPath(info.hash.type, *i); + + if (info.hash != nullHash && info.hash != current.first) { + printMsg(lvlError, format("path `%1%' was modified! " + "expected hash `%2%', got `%3%'") + % *i % printHash(info.hash) % printHash(current.first)); + if (repair) repairPath(*i); else errors = true; + } else { + + bool update = false; + + /* Fill in missing hashes. */ + if (info.hash == nullHash) { + printMsg(lvlError, format("fixing missing hash on `%1%'") % *i); + info.hash = 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) updatePathInfo(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); + 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, repair, errors); + 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); + if (repair) + try { + repairPath(path); + } catch (Error & e) { + printMsg(lvlError, format("warning: %1%") % e.msg()); + errors = true; + } + else errors = true; + } + + return; + } + + validPaths.insert(path); +} + + +bool LocalStore::pathContentsGood(const Path & path) +{ + std::map<Path, bool>::iterator i = pathContentsGoodCache.find(path); + if (i != pathContentsGoodCache.end()) return i->second; + printMsg(lvlInfo, format("checking path `%1%'...") % path); + ValidPathInfo info = queryPathInfo(path); + bool res; + if (!pathExists(path)) + res = false; + else { + HashResult current = hashPath(info.hash.type, path); + Hash nullHash(htSHA256); + res = info.hash == nullHash || info.hash == current.first; + } + pathContentsGoodCache[path] = res; + if (!res) printMsg(lvlError, format("path `%1%' is corrupted or missing!") % path); + return res; +} + + +void LocalStore::markContentsGood(const Path & path) +{ + pathContentsGoodCache[path] = true; +} + + +/* Functions for upgrading from the pre-SQLite database. */ + +PathSet LocalStore::queryValidPathsOld() +{ + PathSet paths; + Strings entries = readDirectory(settings.nixDBPath + "/info"); + foreach (Strings::iterator, i, entries) + if (i->at(0) != '.') paths.insert(settings.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%") % settings.nixDBPath % baseName).str(); + if (!pathExists(infoFile)) + throw Error(format("path `%1%' is not valid") % path); + string info = readFile(infoFile); + + /* Parse it. */ + Strings lines = tokenizeString<Strings>(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<Strings>(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), false); + 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(); +} + + +#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)) { + Strings names = readDirectory(path); + foreach (Strings::iterator, i, names) + makeMutable(path + "/" + *i); + } + + /* 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() +{ + if (sqlite3_exec(db, "vacuum;", 0, 0, 0) != SQLITE_OK) + throwSQLiteError(db, "vacuuming SQLite database"); +} + + +} |