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local-store.cc
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local-store.cc
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#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/select.h>
#include <sys/time.h>
#include <unistd.h>
#include <utime.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <time.h>
#include <grp.h>
#if __linux__
#include <sched.h>
#include <sys/statvfs.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#endif
#include <sqlite3.h>
namespace nix {
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()
: linksDir(settings.nixStore + "/.links")
, reservedPath(settings.nixDBPath + "/reserved")
, schemaPath(settings.nixDBPath + "/schema")
{
auto state(_state.lock());
if (settings.readOnlyMode) {
openDB(*state, false);
return;
}
/* Create missing state directories if they don't already exist. */
createDirs(settings.nixStore);
makeStoreWritable();
createDirs(linksDir);
Path profilesDir = settings.nixStateDir + "/profiles";
createDirs(profilesDir);
createDirs(settings.nixStateDir + "/temproots");
createDirs(settings.nixDBPath);
Path gcRootsDir = settings.nixStateDir + "/gcroots";
if (!pathExists(gcRootsDir)) {
createDirs(gcRootsDir);
createSymlink(profilesDir, gcRootsDir + "/profiles");
}
/* Optionally, create directories and set permissions for a
multi-user install. */
if (getuid() == 0 && settings.buildUsersGroup != "") {
Path perUserDir = profilesDir + "/per-user";
createDirs(perUserDir);
if (chmod(perUserDir.c_str(), 01777) == -1)
throw SysError(format("could not set permissions on ‘%1%’ to 1777") % perUserDir);
mode_t perm = 01775;
struct group * gr = getgrnam(settings.buildUsersGroup.c_str());
if (!gr)
printMsg(lvlError, format("warning: the group ‘%1%’ specified in ‘build-users-group’ does not exist")
% settings.buildUsersGroup);
else {
struct stat st;
if (stat(settings.nixStore.c_str(), &st))
throw SysError(format("getting attributes of path ‘%1%’") % settings.nixStore);
if (st.st_uid != 0 || st.st_gid != gr->gr_gid || (st.st_mode & ~S_IFMT) != perm) {
if (chown(settings.nixStore.c_str(), 0, gr->gr_gid) == -1)
throw SysError(format("changing ownership of path ‘%1%’") % settings.nixStore);
if (chmod(settings.nixStore.c_str(), perm) == -1)
throw SysError(format("changing permissions on path ‘%1%’") % settings.nixStore);
}
}
}
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 {
struct stat st;
if (stat(reservedPath.c_str(), &st) == -1 ||
st.st_size != settings.reservedSize)
{
AutoCloseFD fd = open(reservedPath.c_str(), O_WRONLY | O_CREAT, 0600);
int res = -1;
#if HAVE_POSIX_FALLOCATE
res = posix_fallocate(fd, 0, settings.reservedSize);
#endif
if (res == -1) {
writeFull(fd, string(settings.reservedSize, 'X'));
ftruncate(fd, settings.reservedSize);
}
}
} 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(*state, 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(*state, 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 (curSchema < 6)
throw Error(
"Your Nix store has a database in flat file format,\n"
"which is no longer supported. To convert to the new format,\n"
"please upgrade Nix to version 1.11 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 < 7) { upgradeStore7(); }
openDB(*state, false);
if (curSchema < 8) {
SQLiteTxn txn(state->db);
if (sqlite3_exec(state->db, "alter table ValidPaths add column ultimate integer", 0, 0, 0) != SQLITE_OK)
throwSQLiteError(state->db, "upgrading database schema");
if (sqlite3_exec(state->db, "alter table ValidPaths add column sigs text", 0, 0, 0) != SQLITE_OK)
throwSQLiteError(state->db, "upgrading database schema");
txn.commit();
}
if (curSchema < 9) {
SQLiteTxn txn(state->db);
if (sqlite3_exec(state->db, "drop table FailedPaths", 0, 0, 0) != SQLITE_OK)
throwSQLiteError(state->db, "upgrading database schema");
txn.commit();
}
writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str());
lockFile(globalLock, ltRead, true);
}
else openDB(*state, false);
}
LocalStore::~LocalStore()
{
auto state(_state.lock());
try {
for (auto & i : state->runningSubstituters) {
if (i.second.disabled) continue;
i.second.to.close();
i.second.from.close();
i.second.error.close();
if (i.second.pid != -1)
i.second.pid.wait(true);
}
} catch (...) {
ignoreException();
}
try {
if (state->fdTempRoots != -1) {
state->fdTempRoots.close();
unlink(state->fnTempRoots.c_str());
}
} 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;
}
bool LocalStore::haveWriteAccess()
{
return access(settings.nixDBPath.c_str(), R_OK | W_OK) == 0;
}
void LocalStore::openDB(State & state, bool create)
{
if (!haveWriteAccess())
throw SysError(format("Nix database directory ‘%1%’ is not writable") % settings.nixDBPath);
/* Open the Nix database. */
string dbPath = settings.nixDBPath + "/db.sqlite";
auto & db(state.db);
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. */
state.stmtRegisterValidPath.create(db,
"insert into ValidPaths (path, hash, registrationTime, deriver, narSize, ultimate, sigs) values (?, ?, ?, ?, ?, ?, ?);");
state.stmtUpdatePathInfo.create(db,
"update ValidPaths set narSize = ?, hash = ?, ultimate = ?, sigs = ? where path = ?;");
state.stmtAddReference.create(db,
"insert or replace into Refs (referrer, reference) values (?, ?);");
state.stmtQueryPathInfo.create(db,
"select id, hash, registrationTime, deriver, narSize, ultimate, sigs from ValidPaths where path = ?;");
state.stmtQueryReferences.create(db,
"select path from Refs join ValidPaths on reference = id where referrer = ?;");
state.stmtQueryReferrers.create(db,
"select path from Refs join ValidPaths on referrer = id where reference = (select id from ValidPaths where path = ?);");
state.stmtInvalidatePath.create(db,
"delete from ValidPaths where path = ?;");
state.stmtAddDerivationOutput.create(db,
"insert or replace into DerivationOutputs (drv, id, path) values (?, ?, ?);");
state.stmtQueryValidDerivers.create(db,
"select v.id, v.path from DerivationOutputs d join ValidPaths v on d.drv = v.id where d.path = ?;");
state.stmtQueryDerivationOutputs.create(db,
"select id, path from DerivationOutputs where drv = ?;");
// Use "path >= ?" with limit 1 rather than "path like '?%'" to
// ensure efficient lookup.
state.stmtQueryPathFromHashPart.create(db,
"select path from ValidPaths where path >= ? limit 1;");
state.stmtQueryValidPaths.create(db, "select path from ValidPaths");
}
/* 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 __linux__
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(), "none", 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. */
if (!(S_ISREG(st.st_mode) || S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode)))
throw Error(format("file ‘%1%’ has an unsupported type") % path);
/* Fail if the file is not owned by the build user. This prevents
us from messing up the ownership/permissions of files
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(), getegid()) == -1)
#else
if (!S_ISLNK(st.st_mode) &&
chown(path.c_str(), geteuid(), getegid()) == -1)
#endif
throw SysError(format("changing owner of ‘%1%’ to %2%")
% path % geteuid());
}
if (S_ISDIR(st.st_mode)) {
DirEntries entries = readDirectory(path);
for (auto & i : entries)
canonicalisePathMetaData_(path + "/" + i.name, fromUid, inodesSeen);
}
}
void canonicalisePathMetaData(const Path & path, uid_t fromUid, InodesSeen & inodesSeen)
{
canonicalisePathMetaData_(path, fromUid, inodesSeen);
/* On platforms that don't have lchown(), the top-level path can't
be a symlink, since we can't change its ownership. */
struct stat st;
if (lstat(path.c_str(), &st))
throw SysError(format("getting attributes of path ‘%1%’") % path);
if (st.st_uid != geteuid()) {
assert(S_ISLNK(st.st_mode));
throw Error(format("wrong ownership of top-level store path ‘%1%’") % path);
}
}
void canonicalisePathMetaData(const Path & path, uid_t fromUid)
{
InodesSeen inodesSeen;
canonicalisePathMetaData(path, fromUid, inodesSeen);
}
void LocalStore::checkDerivationOutputs(const Path & drvPath, const Derivation & drv)
{
string drvName = storePathToName(drvPath);
assert(isDerivation(drvName));
drvName = string(drvName, 0, drvName.size() - drvExtension.size());
if (drv.isFixedOutput()) {
DerivationOutputs::const_iterator out = drv.outputs.find("out");
if (out == drv.outputs.end())
throw Error(format("derivation ‘%1%’ does not have an output named ‘out’") % drvPath);
bool recursive; HashType ht; Hash h;
out->second.parseHashInfo(recursive, ht, h);
Path outPath = makeFixedOutputPath(recursive, ht, h, drvName);
StringPairs::const_iterator j = drv.env.find("out");
if (out->second.path != outPath || j == drv.env.end() || j->second != outPath)
throw Error(format("derivation ‘%1%’ has incorrect output ‘%2%’, should be ‘%3%’")
% drvPath % out->second.path % outPath);
}
else {
Derivation drvCopy(drv);
for (auto & i : drvCopy.outputs) {
i.second.path = "";
drvCopy.env[i.first] = "";
}
Hash h = hashDerivationModulo(*this, drvCopy);
for (auto & i : drv.outputs) {
Path outPath = makeOutputPath(i.first, h, drvName);
StringPairs::const_iterator j = drv.env.find(i.first);
if (i.second.path != outPath || j == drv.env.end() || j->second != outPath)
throw Error(format("derivation ‘%1%’ has incorrect output ‘%2%’, should be ‘%3%’")
% drvPath % i.second.path % outPath);
}
}
}
uint64_t LocalStore::addValidPath(State & state,
const ValidPathInfo & info, bool checkOutputs)
{
state.stmtRegisterValidPath.use()
(info.path)
("sha256:" + printHash(info.narHash))
(info.registrationTime == 0 ? time(0) : info.registrationTime)
(info.deriver, info.deriver != "")
(info.narSize, info.narSize != 0)
(info.ultimate ? 1 : 0, info.ultimate)
(concatStringsSep(" ", info.sigs), !info.sigs.empty())
.exec();
uint64_t id = sqlite3_last_insert_rowid(state.db);
/* If this is a derivation, then store the derivation outputs in
the database. This is useful for the garbage collector: it can
efficiently query whether a path is an output of some
derivation. */
if (isDerivation(info.path)) {
Derivation drv = readDerivation(info.path);
/* Verify that the output paths in the derivation are correct
(i.e., follow the scheme for computing output paths from
derivations). Note that if this throws an error, then the
DB transaction is rolled back, so the path validity
registration above is undone. */
if (checkOutputs) checkDerivationOutputs(info.path, drv);
for (auto & i : drv.outputs) {
state.stmtAddDerivationOutput.use()
(id)
(i.first)
(i.second.path)
.exec();
}
}
return id;
}
Hash parseHashField(const Path & path, const string & s)
{
string::size_type colon = s.find(':');
if (colon == string::npos)
throw Error(format("corrupt hash ‘%1%’ in valid-path entry for ‘%2%’")
% s % path);
HashType ht = parseHashType(string(s, 0, colon));
if (ht == htUnknown)
throw Error(format("unknown hash type ‘%1%’ in valid-path entry for ‘%2%’")
% string(s, 0, colon) % path);
return parseHash(ht, string(s, colon + 1));
}
ValidPathInfo LocalStore::queryPathInfo(const Path & path)
{
ValidPathInfo info;
info.path = path;
assertStorePath(path);
return retrySQLite<ValidPathInfo>([&]() {
auto state(_state.lock());
/* Get the path info. */
auto useQueryPathInfo(state->stmtQueryPathInfo.use()(path));
if (!useQueryPathInfo.next())
throw Error(format("path ‘%1%’ is not valid") % path);
info.id = useQueryPathInfo.getInt(0);
info.narHash = parseHashField(path, useQueryPathInfo.getStr(1));
info.registrationTime = useQueryPathInfo.getInt(2);
auto s = (const char *) sqlite3_column_text(state->stmtQueryPathInfo, 3);
if (s) info.deriver = s;
/* Note that narSize = NULL yields 0. */
info.narSize = useQueryPathInfo.getInt(4);
info.ultimate = useQueryPathInfo.getInt(5) == 1;
s = (const char *) sqlite3_column_text(state->stmtQueryPathInfo, 6);
if (s) info.sigs = tokenizeString<StringSet>(s, " ");
/* Get the references. */
auto useQueryReferences(state->stmtQueryReferences.use()(info.id));
while (useQueryReferences.next())
info.references.insert(useQueryReferences.getStr(0));
return info;
});
}
/* Update path info in the database. */
void LocalStore::updatePathInfo(State & state, const ValidPathInfo & info)
{
state.stmtUpdatePathInfo.use()
(info.narSize, info.narSize != 0)
("sha256:" + printHash(info.narHash))
(info.ultimate ? 1 : 0, info.ultimate)
(concatStringsSep(" ", info.sigs), !info.sigs.empty())
(info.path)
.exec();
}
uint64_t LocalStore::queryValidPathId(State & state, const Path & path)
{
auto use(state.stmtQueryPathInfo.use()(path));
if (!use.next())
throw Error(format("path ‘%1%’ is not valid") % path);
return use.getInt(0);
}
bool LocalStore::isValidPath(State & state, const Path & path)
{
return state.stmtQueryPathInfo.use()(path).next();
}
bool LocalStore::isValidPath(const Path & path)
{
return retrySQLite<bool>([&]() {
auto state(_state.lock());
return isValidPath(*state, path);
});
}
PathSet LocalStore::queryValidPaths(const PathSet & paths)
{
PathSet res;
for (auto & i : paths)
if (isValidPath(i)) res.insert(i);
return res;
}
PathSet LocalStore::queryAllValidPaths()
{
return retrySQLite<PathSet>([&]() {
auto state(_state.lock());
auto use(state->stmtQueryValidPaths.use());
PathSet res;
while (use.next()) res.insert(use.getStr(0));
return res;
});
}
void LocalStore::queryReferrers(State & state, const Path & path, PathSet & referrers)
{
auto useQueryReferrers(state.stmtQueryReferrers.use()(path));
while (useQueryReferrers.next())
referrers.insert(useQueryReferrers.getStr(0));
}
void LocalStore::queryReferrers(const Path & path, PathSet & referrers)
{
assertStorePath(path);
return retrySQLite<void>([&]() {
auto state(_state.lock());
queryReferrers(*state, path, referrers);
});
}
Path LocalStore::queryDeriver(const Path & path)
{
return queryPathInfo(path).deriver;
}
PathSet LocalStore::queryValidDerivers(const Path & path)
{
assertStorePath(path);
return retrySQLite<PathSet>([&]() {
auto state(_state.lock());
auto useQueryValidDerivers(state->stmtQueryValidDerivers.use()(path));
PathSet derivers;
while (useQueryValidDerivers.next())
derivers.insert(useQueryValidDerivers.getStr(1));
return derivers;
});
}
PathSet LocalStore::queryDerivationOutputs(const Path & path)
{
return retrySQLite<PathSet>([&]() {
auto state(_state.lock());
auto useQueryDerivationOutputs(state->stmtQueryDerivationOutputs.use()
(queryValidPathId(*state, path)));
PathSet outputs;
while (useQueryDerivationOutputs.next())
outputs.insert(useQueryDerivationOutputs.getStr(1));
return outputs;
});
}
StringSet LocalStore::queryDerivationOutputNames(const Path & path)
{
return retrySQLite<StringSet>([&]() {
auto state(_state.lock());
auto useQueryDerivationOutputs(state->stmtQueryDerivationOutputs.use()
(queryValidPathId(*state, path)));
StringSet outputNames;
while (useQueryDerivationOutputs.next())
outputNames.insert(useQueryDerivationOutputs.getStr(0));
return outputNames;
});
}
Path LocalStore::queryPathFromHashPart(const string & hashPart)
{
if (hashPart.size() != storePathHashLen) throw Error("invalid hash part");
Path prefix = settings.nixStore + "/" + hashPart;
return retrySQLite<Path>([&]() {
auto state(_state.lock());
auto useQueryPathFromHashPart(state->stmtQueryPathFromHashPart.use()(prefix));
if (!useQueryPathFromHashPart.next()) return "";
const char * s = (const char *) sqlite3_column_text(state->stmtQueryPathFromHashPart, 0);
return s && prefix.compare(0, prefix.size(), s, prefix.size()) == 0 ? s : "";
});
}
void LocalStore::setSubstituterEnv()
{
static std::atomic_flag done;
if (done.test_and_set()) return;
/* Pass configuration options (including those overridden with
--option) to substituters. */
setenv("_NIX_OPTIONS", settings.pack().c_str(), 1);
}
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 = startProcess([&]() {
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);
});
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)
{
auto state(_state.lock());
PathSet res;
for (auto & i : settings.substituters) {
if (res.size() == paths.size()) break;
RunningSubstituter & run(state->runningSubstituters[i]);
startSubstituter(i, run);
if (run.disabled) continue;
string s = "have ";
for (auto & 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)
{
auto state(_state.lock());
RunningSubstituter & run(state->runningSubstituters[substituter]);
startSubstituter(substituter, run);
if (run.disabled) return;
string s = "info ";
for (auto & 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;
for (auto & i : settings.substituters) {
if (todo.empty()) break;
querySubstitutablePathInfos(i, todo, infos);
}
}
Hash LocalStore::queryPathHash(const Path & path)
{
return queryPathInfo(path).narHash;