1229 lines
37 KiB
C++
1229 lines
37 KiB
C++
#include "config.h"
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#include "local-store.hh"
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#include "util.hh"
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#include "globals.hh"
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#include "db.hh"
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#include "archive.hh"
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#include "pathlocks.hh"
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#include "aterm.hh"
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#include "derivations-ast.hh"
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#include "worker-protocol.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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namespace nix {
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/* Nix database. */
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static Database nixDB;
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/* Database tables. */
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/* dbValidPaths :: Path -> ()
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The existence of a key $p$ indicates that path $p$ is valid (that
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is, produced by a succesful build). */
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static TableId dbValidPaths = 0;
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/* dbReferences :: Path -> [Path]
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This table lists the outgoing file system references for each
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output path that has been built by a Nix derivation. These are
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found by scanning the path for the hash components of input
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paths. */
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static TableId dbReferences = 0;
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/* dbReferrers :: Path -> Path
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This table is just the reverse mapping of dbReferences. This table
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can have duplicate keys, each corresponding value denoting a single
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referrer. */
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static TableId dbReferrers = 0;
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/* dbDerivers :: Path -> [Path]
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This table lists the derivation used to build a path. There can
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only be multiple such paths for fixed-output derivations (i.e.,
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derivations specifying an expected hash). */
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static TableId dbDerivers = 0;
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static void upgradeStore07();
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static void upgradeStore09();
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static void upgradeStore11();
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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(bool reserveSpace)
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{
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substitutablePathsLoaded = false;
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if (readOnlyMode) return;
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checkStoreNotSymlink();
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try {
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Path reservedPath = nixDBPath + "/reserved";
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string s = querySetting("gc-reserved-space", "");
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int reservedSize;
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if (!string2Int(s, reservedSize)) reservedSize = 1024 * 1024;
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if (reserveSpace) {
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struct stat st;
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if (stat(reservedPath.c_str(), &st) == -1 ||
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st.st_size != reservedSize)
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writeFile(reservedPath, string(reservedSize, 'X'));
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}
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else
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deletePath(reservedPath);
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} catch (SysError & e) { /* don't care about errors */
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}
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try {
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nixDB.open(nixDBPath);
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} catch (DbNoPermission & e) {
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printMsg(lvlTalkative, "cannot access Nix database; continuing anyway");
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readOnlyMode = true;
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return;
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}
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dbValidPaths = nixDB.openTable("validpaths");
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dbReferences = nixDB.openTable("references");
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dbReferrers = nixDB.openTable("referrers", true); /* must be sorted */
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dbDerivers = nixDB.openTable("derivers");
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int curSchema = 0;
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Path schemaFN = nixDBPath + "/schema";
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if (pathExists(schemaFN)) {
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string s = readFile(schemaFN);
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if (!string2Int(s, curSchema))
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throw Error(format("`%1%' is corrupt") % schemaFN);
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}
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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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if (curSchema < nixSchemaVersion) {
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if (curSchema <= 1)
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upgradeStore07();
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if (curSchema == 2)
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upgradeStore09();
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if (curSchema == 3)
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upgradeStore11();
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writeFile(schemaFN, (format("%1%") % nixSchemaVersion).str());
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}
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}
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LocalStore::~LocalStore()
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{
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/* If the database isn't open, this is a NOP. */
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try {
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nixDB.close();
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} catch (...) {
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ignoreException();
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}
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}
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void createStoreTransaction(Transaction & txn)
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{
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Transaction txn2(nixDB);
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txn2.moveTo(txn);
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}
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void copyPath(const Path & src, const Path & dst, PathFilter & filter)
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{
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debug(format("copying `%1%' to `%2%'") % src % dst);
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/* Dump an archive of the path `src' into a string buffer, then
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restore the archive to `dst'. This is not a very good method
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for very large paths, but `copyPath' is mainly used for small
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files. */
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StringSink sink;
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dumpPath(src, sink, filter);
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StringSource source(sink.s);
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restorePath(dst, source);
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}
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static 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 its 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 = 0;
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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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for (Strings::iterator i = names.begin(); i != names.end(); ++i)
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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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bool isValidPathTxn(const Transaction & txn, const Path & path)
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{
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string s;
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return nixDB.queryString(txn, dbValidPaths, path, s);
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}
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bool LocalStore::isValidPath(const Path & path)
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{
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return isValidPathTxn(noTxn, path);
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}
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static string addPrefix(const string & prefix, const string & s)
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{
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return prefix + string(1, (char) 0) + s;
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}
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static string stripPrefix(const string & prefix, const string & s)
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{
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if (s.size() <= prefix.size() ||
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string(s, 0, prefix.size()) != prefix ||
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s[prefix.size()] != 0)
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throw Error(format("string `%1%' is missing prefix `%2%'")
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% s % prefix);
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return string(s, prefix.size() + 1);
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}
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static PathSet getReferrers(const Transaction & txn, const Path & storePath)
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{
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PathSet referrers;
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Strings keys;
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nixDB.enumTable(txn, dbReferrers, keys, storePath + string(1, (char) 0));
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for (Strings::iterator i = keys.begin(); i != keys.end(); ++i)
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referrers.insert(stripPrefix(storePath, *i));
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return referrers;
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}
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void setReferences(const Transaction & txn, const Path & storePath,
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const PathSet & references)
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{
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/* For invalid paths, we can only clear the references. */
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if (references.size() > 0 && !isValidPathTxn(txn, storePath))
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throw Error(
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format("cannot set references for invalid path `%1%'") % storePath);
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Paths oldReferences;
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nixDB.queryStrings(txn, dbReferences, storePath, oldReferences);
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PathSet oldReferences2(oldReferences.begin(), oldReferences.end());
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if (oldReferences2 == references) return;
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nixDB.setStrings(txn, dbReferences, storePath,
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Paths(references.begin(), references.end()));
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/* Update the referrers mappings of all new referenced paths. */
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for (PathSet::const_iterator i = references.begin();
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i != references.end(); ++i)
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if (oldReferences2.find(*i) == oldReferences2.end())
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nixDB.setString(txn, dbReferrers, addPrefix(*i, storePath), "");
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/* Remove referrer mappings from paths that are no longer
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references. */
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for (Paths::iterator i = oldReferences.begin();
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i != oldReferences.end(); ++i)
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if (references.find(*i) == references.end())
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nixDB.delPair(txn, dbReferrers, addPrefix(*i, storePath));
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}
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void queryReferences(const Transaction & txn,
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const Path & storePath, PathSet & references)
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{
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Paths references2;
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if (!isValidPathTxn(txn, storePath))
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throw Error(format("path `%1%' is not valid") % storePath);
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nixDB.queryStrings(txn, dbReferences, storePath, references2);
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references.insert(references2.begin(), references2.end());
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}
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void LocalStore::queryReferences(const Path & storePath,
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PathSet & references)
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{
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nix::queryReferences(noTxn, storePath, references);
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}
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void queryReferrers(const Transaction & txn,
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const Path & storePath, PathSet & referrers)
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{
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if (!isValidPathTxn(txn, storePath))
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throw Error(format("path `%1%' is not valid") % storePath);
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PathSet referrers2 = getReferrers(txn, storePath);
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referrers.insert(referrers2.begin(), referrers2.end());
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}
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void LocalStore::queryReferrers(const Path & storePath,
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PathSet & referrers)
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{
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nix::queryReferrers(noTxn, storePath, referrers);
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}
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void setDeriver(const Transaction & txn, const Path & storePath,
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const Path & deriver)
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{
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assertStorePath(storePath);
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if (deriver == "") return;
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assertStorePath(deriver);
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if (!isValidPathTxn(txn, storePath))
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throw Error(format("path `%1%' is not valid") % storePath);
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nixDB.setString(txn, dbDerivers, storePath, deriver);
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}
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static Path queryDeriver(const Transaction & txn, const Path & storePath)
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{
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if (!isValidPathTxn(txn, storePath))
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throw Error(format("path `%1%' is not valid") % storePath);
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Path deriver;
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if (nixDB.queryString(txn, dbDerivers, storePath, deriver))
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return deriver;
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else
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return "";
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}
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Path LocalStore::queryDeriver(const Path & path)
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{
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return nix::queryDeriver(noTxn, path);
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}
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PathSet LocalStore::querySubstitutablePaths()
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{
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if (!substitutablePathsLoaded) {
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for (Paths::iterator i = substituters.begin(); i != substituters.end(); ++i) {
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debug(format("running `%1%' to find out substitutable paths") % *i);
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Strings args;
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args.push_back("--query-paths");
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Strings ss = tokenizeString(runProgram(*i, false, args), "\n");
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for (Strings::iterator j = ss.begin(); j != ss.end(); ++j) {
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if (!isStorePath(*j))
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throw Error(format("`%1%' returned a bad substitutable path `%2%'")
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% *i % *j);
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substitutablePaths.insert(*j);
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}
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}
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substitutablePathsLoaded = true;
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}
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return substitutablePaths;
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}
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bool LocalStore::hasSubstitutes(const Path & path)
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{
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if (!substitutablePathsLoaded)
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querySubstitutablePaths();
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return substitutablePaths.find(path) != substitutablePaths.end();
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}
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static void setHash(const Transaction & txn, const Path & storePath,
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const Hash & hash)
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{
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assert(hash.type == htSHA256);
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nixDB.setString(txn, dbValidPaths, storePath, "sha256:" + printHash(hash));
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}
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static Hash queryHash(const Transaction & txn, const Path & storePath)
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{
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string s;
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nixDB.queryString(txn, dbValidPaths, storePath, s);
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string::size_type colon = s.find(':');
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if (colon == string::npos)
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throw Error(format("corrupt hash `%1%' in valid-path entry for `%2%'")
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% s % storePath);
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HashType ht = parseHashType(string(s, 0, colon));
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if (ht == htUnknown)
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throw Error(format("unknown hash type `%1%' in valid-path entry for `%2%'")
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% string(s, 0, colon) % storePath);
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return parseHash(ht, string(s, colon + 1));
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}
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Hash LocalStore::queryPathHash(const Path & path)
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{
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if (!isValidPath(path))
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throw Error(format("path `%1%' is not valid") % path);
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return queryHash(noTxn, path);
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}
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void registerValidPath(const Transaction & txn,
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const Path & path, const Hash & hash, const PathSet & references,
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const Path & deriver)
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{
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ValidPathInfo info;
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info.path = path;
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info.hash = hash;
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info.references = references;
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info.deriver = deriver;
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ValidPathInfos infos;
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infos.push_back(info);
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registerValidPaths(txn, infos);
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}
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void registerValidPaths(const Transaction & txn,
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const ValidPathInfos & infos)
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{
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PathSet newPaths;
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for (ValidPathInfos::const_iterator i = infos.begin();
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i != infos.end(); ++i)
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newPaths.insert(i->path);
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for (ValidPathInfos::const_iterator i = infos.begin();
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i != infos.end(); ++i)
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{
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assertStorePath(i->path);
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debug(format("registering path `%1%'") % i->path);
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setHash(txn, i->path, i->hash);
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setReferences(txn, i->path, i->references);
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/* Check that all referenced paths are also valid (or about to
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become valid). */
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for (PathSet::iterator j = i->references.begin();
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j != i->references.end(); ++j)
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if (!isValidPathTxn(txn, *j) && newPaths.find(*j) == newPaths.end())
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throw Error(format("cannot register path `%1%' as valid, since its reference `%2%' is invalid")
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% i->path % *j);
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setDeriver(txn, i->path, i->deriver);
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}
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}
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/* Invalidate a path. The caller is responsible for checking that
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there are no referrers. */
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static void invalidatePath(Transaction & txn, const Path & path)
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{
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debug(format("invalidating path `%1%'") % path);
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/* Clear the `references' entry for this path, as well as the
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inverse `referrers' entries, and the `derivers' entry. */
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setReferences(txn, path, PathSet());
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nixDB.delPair(txn, dbDerivers, path);
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nixDB.delPair(txn, dbValidPaths, path);
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}
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Path LocalStore::addToStore(const Path & _srcPath, bool fixed,
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bool recursive, string hashAlgo, PathFilter & filter)
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{
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Path srcPath(absPath(_srcPath));
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debug(format("adding `%1%' to the store") % srcPath);
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std::pair<Path, Hash> pr =
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computeStorePathForPath(srcPath, fixed, recursive, hashAlgo, filter);
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Path & dstPath(pr.first);
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Hash & h(pr.second);
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addTempRoot(dstPath);
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if (!isValidPath(dstPath)) {
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/* The first check above is an optimisation to prevent
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unnecessary lock acquisition. */
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PathLocks outputLock(singleton<PathSet, Path>(dstPath));
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if (!isValidPath(dstPath)) {
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if (pathExists(dstPath)) deletePathWrapped(dstPath);
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|
|
copyPath(srcPath, dstPath, filter);
|
|
|
|
Hash h2 = hashPath(htSHA256, dstPath, filter);
|
|
if (h != h2)
|
|
throw Error(format("contents of `%1%' changed while copying it to `%2%' (%3% -> %4%)")
|
|
% srcPath % dstPath % printHash(h) % printHash(h2));
|
|
|
|
canonicalisePathMetaData(dstPath);
|
|
|
|
Transaction txn(nixDB);
|
|
registerValidPath(txn, dstPath, h, PathSet(), "");
|
|
txn.commit();
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
Path LocalStore::addTextToStore(const string & suffix, const string & s,
|
|
const PathSet & references)
|
|
{
|
|
Path dstPath = computeStorePathForText(suffix, s, references);
|
|
|
|
addTempRoot(dstPath);
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
PathLocks outputLock(singleton<PathSet, Path>(dstPath));
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
if (pathExists(dstPath)) deletePathWrapped(dstPath);
|
|
|
|
writeStringToFile(dstPath, s);
|
|
|
|
canonicalisePathMetaData(dstPath);
|
|
|
|
Transaction txn(nixDB);
|
|
registerValidPath(txn, dstPath,
|
|
hashPath(htSHA256, dstPath), references, "");
|
|
txn.commit();
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
struct HashAndWriteSink : Sink
|
|
{
|
|
Sink & writeSink;
|
|
HashSink hashSink;
|
|
bool hashing;
|
|
HashAndWriteSink(Sink & writeSink) : writeSink(writeSink), hashSink(htSHA256)
|
|
{
|
|
hashing = true;
|
|
}
|
|
virtual void operator ()
|
|
(const unsigned char * data, unsigned int len)
|
|
{
|
|
writeSink(data, len);
|
|
if (hashing) hashSink(data, len);
|
|
}
|
|
};
|
|
|
|
|
|
#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);
|
|
|
|
/* Wrap all of this in a transaction to make sure that we export
|
|
consistent metadata. */
|
|
Transaction txn(nixDB);
|
|
addTempRoot(path);
|
|
if (!isValidPathTxn(txn, path))
|
|
throw Error(format("path `%1%' is not valid") % path);
|
|
|
|
HashAndWriteSink hashAndWriteSink(sink);
|
|
|
|
dumpPath(path, hashAndWriteSink);
|
|
|
|
writeInt(EXPORT_MAGIC, hashAndWriteSink);
|
|
|
|
writeString(path, hashAndWriteSink);
|
|
|
|
PathSet references;
|
|
nix::queryReferences(txn, path, references);
|
|
writeStringSet(references, hashAndWriteSink);
|
|
|
|
Path deriver = nix::queryDeriver(txn, path);
|
|
writeString(deriver, hashAndWriteSink);
|
|
|
|
if (sign) {
|
|
Hash hash = hashAndWriteSink.hashSink.finish();
|
|
hashAndWriteSink.hashing = false;
|
|
|
|
writeInt(1, hashAndWriteSink);
|
|
|
|
Path tmpDir = createTempDir();
|
|
AutoDelete delTmp(tmpDir);
|
|
Path hashFile = tmpDir + "/hash";
|
|
writeStringToFile(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);
|
|
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
};
|
|
|
|
|
|
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 = createTempDir(nixStore);
|
|
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();
|
|
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";
|
|
writeStringToFile(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(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);
|
|
|
|
Transaction txn(nixDB);
|
|
/* !!! if we were clever, we could prevent the hashPath()
|
|
here. */
|
|
if (!isValidPath(deriver)) deriver = "";
|
|
registerValidPath(txn, dstPath,
|
|
hashPath(htSHA256, dstPath), references, deriver);
|
|
txn.commit();
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
void deleteFromStore(const Path & _path, unsigned long long & bytesFreed)
|
|
{
|
|
bytesFreed = 0;
|
|
Path path(canonPath(_path));
|
|
|
|
assertStorePath(path);
|
|
|
|
Transaction txn(nixDB);
|
|
if (isValidPathTxn(txn, path)) {
|
|
PathSet referrers = getReferrers(txn, path);
|
|
for (PathSet::iterator i = referrers.begin();
|
|
i != referrers.end(); ++i)
|
|
if (*i != path && isValidPathTxn(txn, *i))
|
|
throw PathInUse(format("cannot delete path `%1%' because it is in use by path `%2%'") % path % *i);
|
|
invalidatePath(txn, path);
|
|
}
|
|
txn.commit();
|
|
|
|
deletePathWrapped(path, bytesFreed);
|
|
}
|
|
|
|
|
|
void verifyStore(bool checkContents)
|
|
{
|
|
Transaction txn(nixDB);
|
|
|
|
|
|
printMsg(lvlInfo, "checking path existence");
|
|
|
|
Paths paths;
|
|
PathSet validPaths;
|
|
nixDB.enumTable(txn, dbValidPaths, paths);
|
|
|
|
for (Paths::iterator i = paths.begin(); i != paths.end(); ++i) {
|
|
checkInterrupt();
|
|
if (!pathExists(*i)) {
|
|
printMsg(lvlError, format("path `%1%' disappeared") % *i);
|
|
invalidatePath(txn, *i);
|
|
} else if (!isStorePath(*i)) {
|
|
printMsg(lvlError, format("path `%1%' is not in the Nix store") % *i);
|
|
invalidatePath(txn, *i);
|
|
} else {
|
|
if (checkContents) {
|
|
debug(format("checking contents of `%1%'") % *i);
|
|
Hash expected = queryHash(txn, *i);
|
|
Hash current = hashPath(expected.type, *i);
|
|
if (current != expected) {
|
|
printMsg(lvlError, format("path `%1%' was modified! "
|
|
"expected hash `%2%', got `%3%'")
|
|
% *i % printHash(expected) % printHash(current));
|
|
}
|
|
}
|
|
validPaths.insert(*i);
|
|
}
|
|
}
|
|
|
|
|
|
/* Check the cleanup invariant: only valid paths can have
|
|
`references', `referrers', or `derivers' entries. */
|
|
|
|
|
|
/* Check the `derivers' table. */
|
|
printMsg(lvlInfo, "checking the derivers table");
|
|
Paths deriversKeys;
|
|
nixDB.enumTable(txn, dbDerivers, deriversKeys);
|
|
for (Paths::iterator i = deriversKeys.begin();
|
|
i != deriversKeys.end(); ++i)
|
|
{
|
|
if (validPaths.find(*i) == validPaths.end()) {
|
|
printMsg(lvlError, format("removing deriver entry for invalid path `%1%'")
|
|
% *i);
|
|
nixDB.delPair(txn, dbDerivers, *i);
|
|
}
|
|
else {
|
|
Path deriver = queryDeriver(txn, *i);
|
|
if (!isStorePath(deriver)) {
|
|
printMsg(lvlError, format("removing corrupt deriver `%1%' for `%2%'")
|
|
% deriver % *i);
|
|
nixDB.delPair(txn, dbDerivers, *i);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Check the `references' table. */
|
|
printMsg(lvlInfo, "checking the references table");
|
|
Paths referencesKeys;
|
|
nixDB.enumTable(txn, dbReferences, referencesKeys);
|
|
for (Paths::iterator i = referencesKeys.begin();
|
|
i != referencesKeys.end(); ++i)
|
|
{
|
|
if (validPaths.find(*i) == validPaths.end()) {
|
|
printMsg(lvlError, format("removing references entry for invalid path `%1%'")
|
|
% *i);
|
|
setReferences(txn, *i, PathSet());
|
|
}
|
|
else {
|
|
PathSet references;
|
|
queryReferences(txn, *i, references);
|
|
for (PathSet::iterator j = references.begin();
|
|
j != references.end(); ++j)
|
|
{
|
|
string dummy;
|
|
if (!nixDB.queryString(txn, dbReferrers, addPrefix(*j, *i), dummy)) {
|
|
printMsg(lvlError, format("adding missing referrer mapping from `%1%' to `%2%'")
|
|
% *j % *i);
|
|
nixDB.setString(txn, dbReferrers, addPrefix(*j, *i), "");
|
|
}
|
|
if (validPaths.find(*j) == validPaths.end()) {
|
|
printMsg(lvlError, format("incomplete closure: `%1%' needs missing `%2%'")
|
|
% *i % *j);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check the `referrers' table. */
|
|
printMsg(lvlInfo, "checking the referrers table");
|
|
Strings referrers;
|
|
nixDB.enumTable(txn, dbReferrers, referrers);
|
|
for (Strings::iterator i = referrers.begin(); i != referrers.end(); ++i) {
|
|
|
|
/* Decode the entry (it's a tuple of paths). */
|
|
string::size_type nul = i->find((char) 0);
|
|
if (nul == string::npos) {
|
|
printMsg(lvlError, format("removing bad referrer table entry `%1%'") % *i);
|
|
nixDB.delPair(txn, dbReferrers, *i);
|
|
continue;
|
|
}
|
|
Path to(*i, 0, nul);
|
|
Path from(*i, nul + 1);
|
|
|
|
if (validPaths.find(to) == validPaths.end()) {
|
|
printMsg(lvlError, format("removing referrer entry from `%1%' to invalid `%2%'")
|
|
% from % to);
|
|
nixDB.delPair(txn, dbReferrers, *i);
|
|
}
|
|
|
|
else if (validPaths.find(from) == validPaths.end()) {
|
|
printMsg(lvlError, format("removing referrer entry from invalid `%1%' to `%2%'")
|
|
% from % to);
|
|
nixDB.delPair(txn, dbReferrers, *i);
|
|
}
|
|
|
|
else {
|
|
PathSet references;
|
|
queryReferences(txn, from, references);
|
|
if (find(references.begin(), references.end(), to) == references.end()) {
|
|
printMsg(lvlError, format("adding missing referrer mapping from `%1%' to `%2%'")
|
|
% from % to);
|
|
references.insert(to);
|
|
setReferences(txn, from, references);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
typedef std::map<Hash, std::pair<Path, ino_t> > HashToPath;
|
|
|
|
|
|
static void toggleWritable(const Path & path, bool writable)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
mode_t mode = st.st_mode;
|
|
if (writable) mode |= S_IWUSR;
|
|
else mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
|
|
|
|
if (chmod(path.c_str(), mode) == -1)
|
|
throw SysError(format("changing writability of `%1%'") % path);
|
|
}
|
|
|
|
|
|
static void hashAndLink(bool dryRun, HashToPath & hashToPath,
|
|
OptimiseStats & stats, const Path & path)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
/* Sometimes SNAFUs can cause files in the Nix store to be
|
|
modified, in particular when running programs as root under
|
|
NixOS (example: $fontconfig/var/cache being modified). Skip
|
|
those files. */
|
|
if (S_ISREG(st.st_mode) && (st.st_mode & S_IWUSR)) {
|
|
printMsg(lvlError, format("skipping suspicious writable file `%1%'") % path);
|
|
return;
|
|
}
|
|
|
|
/* We can hard link regular files and symlinks. */
|
|
if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
|
|
|
|
/* Hash the file. Note that hashPath() returns the hash over
|
|
the NAR serialisation, which includes the execute bit on
|
|
the file. Thus, executable and non-executable files with
|
|
the same contents *won't* be linked (which is good because
|
|
otherwise the permissions would be screwed up).
|
|
|
|
Also note that if `path' is a symlink, then we're hashing
|
|
the contents of the symlink (i.e. the result of
|
|
readlink()), not the contents of the target (which may not
|
|
even exist). */
|
|
Hash hash = hashPath(htSHA256, path);
|
|
stats.totalFiles++;
|
|
printMsg(lvlDebug, format("`%1%' has hash `%2%'") % path % printHash(hash));
|
|
|
|
std::pair<Path, ino_t> prevPath = hashToPath[hash];
|
|
|
|
if (prevPath.first == "") {
|
|
hashToPath[hash] = std::pair<Path, ino_t>(path, st.st_ino);
|
|
return;
|
|
}
|
|
|
|
/* Yes! We've seen a file with the same contents. Replace
|
|
the current file with a hard link to that file. */
|
|
stats.sameContents++;
|
|
if (prevPath.second == st.st_ino) {
|
|
printMsg(lvlDebug, format("`%1%' is already linked to `%2%'") % path % prevPath.first);
|
|
return;
|
|
}
|
|
|
|
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % prevPath.first);
|
|
|
|
Path tempLink = (format("%1%.tmp-%2%-%3%")
|
|
% path % getpid() % rand()).str();
|
|
|
|
toggleWritable(dirOf(path), true);
|
|
|
|
if (link(prevPath.first.c_str(), tempLink.c_str()) == -1)
|
|
throw SysError(format("cannot link `%1%' to `%2%'")
|
|
% tempLink % prevPath.first);
|
|
|
|
/* Atomically replace the old file with the new hard link. */
|
|
if (rename(tempLink.c_str(), path.c_str()) == -1)
|
|
throw SysError(format("cannot rename `%1%' to `%2%'")
|
|
% tempLink % path);
|
|
|
|
/* Make the directory read-only again and reset its timestamp
|
|
back to 0. */
|
|
_canonicalisePathMetaData(dirOf(path), false);
|
|
|
|
stats.filesLinked++;
|
|
stats.bytesFreed += st.st_size;
|
|
}
|
|
|
|
if (S_ISDIR(st.st_mode)) {
|
|
Strings names = readDirectory(path);
|
|
for (Strings::iterator i = names.begin(); i != names.end(); ++i)
|
|
hashAndLink(dryRun, hashToPath, stats, path + "/" + *i);
|
|
}
|
|
}
|
|
|
|
|
|
void LocalStore::optimiseStore(bool dryRun, OptimiseStats & stats)
|
|
{
|
|
HashToPath hashToPath;
|
|
|
|
Paths paths;
|
|
PathSet validPaths;
|
|
nixDB.enumTable(noTxn, dbValidPaths, paths);
|
|
|
|
for (Paths::iterator i = paths.begin(); i != paths.end(); ++i) {
|
|
addTempRoot(*i);
|
|
if (!isValidPath(*i)) continue; /* path was GC'ed, probably */
|
|
startNest(nest, lvlChatty, format("hashing files in `%1%'") % *i);
|
|
hashAndLink(dryRun, hashToPath, stats, *i);
|
|
}
|
|
}
|
|
|
|
|
|
/* Upgrade from schema 1 (Nix <= 0.7) to schema 2 (Nix >= 0.8). */
|
|
static void upgradeStore07()
|
|
{
|
|
printMsg(lvlError, "upgrading Nix store to new schema (this may take a while)...");
|
|
|
|
Transaction txn(nixDB);
|
|
|
|
Paths validPaths2;
|
|
nixDB.enumTable(txn, dbValidPaths, validPaths2);
|
|
PathSet validPaths(validPaths2.begin(), validPaths2.end());
|
|
|
|
std::cerr << "hashing paths...";
|
|
int n = 0;
|
|
for (PathSet::iterator i = validPaths.begin(); i != validPaths.end(); ++i) {
|
|
checkInterrupt();
|
|
string s;
|
|
nixDB.queryString(txn, dbValidPaths, *i, s);
|
|
if (s == "") {
|
|
Hash hash = hashPath(htSHA256, *i);
|
|
setHash(txn, *i, hash);
|
|
std::cerr << ".";
|
|
if (++n % 1000 == 0) {
|
|
txn.commit();
|
|
txn.begin(nixDB);
|
|
}
|
|
}
|
|
}
|
|
std::cerr << std::endl;
|
|
|
|
txn.commit();
|
|
|
|
txn.begin(nixDB);
|
|
|
|
std::cerr << "processing closures...";
|
|
for (PathSet::iterator i = validPaths.begin(); i != validPaths.end(); ++i) {
|
|
checkInterrupt();
|
|
if (i->size() > 6 && string(*i, i->size() - 6) == ".store") {
|
|
ATerm t = ATreadFromNamedFile(i->c_str());
|
|
if (!t) throw Error(format("cannot read aterm from `%1%'") % *i);
|
|
|
|
ATermList roots, elems;
|
|
if (!matchOldClosure(t, roots, elems)) continue;
|
|
|
|
for (ATermIterator j(elems); j; ++j) {
|
|
|
|
ATerm path2;
|
|
ATermList references2;
|
|
if (!matchOldClosureElem(*j, path2, references2)) continue;
|
|
|
|
Path path = aterm2String(path2);
|
|
if (validPaths.find(path) == validPaths.end())
|
|
/* Skip this path; it's invalid. This is a normal
|
|
condition (Nix <= 0.7 did not enforce closure
|
|
on closure store expressions). */
|
|
continue;
|
|
|
|
PathSet references;
|
|
for (ATermIterator k(references2); k; ++k) {
|
|
Path reference = aterm2String(*k);
|
|
if (validPaths.find(reference) == validPaths.end())
|
|
/* Bad reference. Set it anyway and let the
|
|
user fix it. */
|
|
printMsg(lvlError, format("closure `%1%' contains reference from `%2%' "
|
|
"to invalid path `%3%' (run `nix-store --verify')")
|
|
% *i % path % reference);
|
|
references.insert(reference);
|
|
}
|
|
|
|
PathSet prevReferences;
|
|
queryReferences(txn, path, prevReferences);
|
|
if (prevReferences.size() > 0 && references != prevReferences)
|
|
printMsg(lvlError, format("warning: conflicting references for `%1%'") % path);
|
|
|
|
if (references != prevReferences)
|
|
setReferences(txn, path, references);
|
|
}
|
|
|
|
std::cerr << ".";
|
|
}
|
|
}
|
|
std::cerr << std::endl;
|
|
|
|
/* !!! maybe this transaction is way too big */
|
|
txn.commit();
|
|
}
|
|
|
|
|
|
/* Upgrade from schema 2 (0.8 <= Nix <= 0.9) to schema 3 (Nix >=
|
|
0.10). The only thing to do here is to upgrade the old `referer'
|
|
table (which causes quadratic complexity in some cases) to the new
|
|
(and properly spelled) `referrer' table. */
|
|
static void upgradeStore09()
|
|
{
|
|
/* !!! we should disallow concurrent upgrades */
|
|
|
|
if (!pathExists(nixDBPath + "/referers")) return;
|
|
|
|
printMsg(lvlError, "upgrading Nix store to new schema (this may take a while)...");
|
|
|
|
Transaction txn(nixDB);
|
|
|
|
std::cerr << "converting referers to referrers...";
|
|
|
|
TableId dbReferers = nixDB.openTable("referers"); /* sic! */
|
|
|
|
Paths referersKeys;
|
|
nixDB.enumTable(txn, dbReferers, referersKeys);
|
|
|
|
int n = 0;
|
|
for (Paths::iterator i = referersKeys.begin();
|
|
i != referersKeys.end(); ++i)
|
|
{
|
|
Paths referers;
|
|
nixDB.queryStrings(txn, dbReferers, *i, referers);
|
|
for (Paths::iterator j = referers.begin();
|
|
j != referers.end(); ++j)
|
|
nixDB.setString(txn, dbReferrers, addPrefix(*i, *j), "");
|
|
if (++n % 1000 == 0) {
|
|
txn.commit();
|
|
txn.begin(nixDB);
|
|
std::cerr << "|";
|
|
}
|
|
std::cerr << ".";
|
|
}
|
|
|
|
txn.commit();
|
|
|
|
std::cerr << std::endl;
|
|
|
|
nixDB.closeTable(dbReferers);
|
|
|
|
nixDB.deleteTable("referers");
|
|
}
|
|
|
|
|
|
/* Upgrade from schema 3 (Nix 0.10) to schema 4 (Nix >= 0.11). The
|
|
only thing to do here is to delete the substitutes table and get
|
|
rid of invalid but substitutable references/referrers. */
|
|
static void upgradeStore11()
|
|
{
|
|
if (!pathExists(nixDBPath + "/substitutes")) return;
|
|
|
|
printMsg(lvlError, "upgrading Nix store to new schema (this may take a while)...");
|
|
|
|
Transaction txn(nixDB);
|
|
TableId dbSubstitutes = nixDB.openTable("substitutes");
|
|
|
|
Paths subKeys;
|
|
nixDB.enumTable(txn, dbSubstitutes, subKeys);
|
|
for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) {
|
|
if (!isValidPathTxn(txn, *i))
|
|
invalidatePath(txn, *i);
|
|
}
|
|
|
|
txn.commit();
|
|
nixDB.closeTable(dbSubstitutes);
|
|
nixDB.deleteTable("substitutes");
|
|
}
|
|
|
|
|
|
}
|