745 lines
20 KiB
C++
745 lines
20 KiB
C++
#include <iostream>
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#include <algorithm>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <utime.h>
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#include "store.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 "gc.hh"
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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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/* dbReferers :: Path -> [Path]
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This table is just the reverse mapping of dbReferences. */
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static TableId dbReferers = 0;
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/* dbSubstitutes :: Path -> [[Path]]
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Each pair $(p, subs)$ tells Nix that it can use any of the
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substitutes in $subs$ to build path $p$. Each substitute defines a
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command-line invocation of a program (i.e., the first list element
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is the full path to the program, the remaining elements are
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arguments).
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The main purpose of this is for distributed caching of derivates.
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One system can compute a derivate and put it on a website (as a Nix
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archive), for instance, and then another system can register a
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substitute for that derivate. The substitute in this case might be
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a Nix derivation that fetches the Nix archive.
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*/
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static TableId dbSubstitutes = 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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bool Substitute::operator == (const Substitute & sub)
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{
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return program == sub.program
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&& args == sub.args;
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}
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void openDB()
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{
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if (readOnlyMode) return;
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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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dbReferers = nixDB.openTable("referers");
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dbSubstitutes = nixDB.openTable("substitutes");
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dbDerivers = nixDB.openTable("derivers");
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}
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void initDB()
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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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/* Path copying. */
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struct CopySink : DumpSink
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{
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int fd;
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virtual void operator () (const unsigned char * data, unsigned int len)
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{
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writeFull(fd, data, len);
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}
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};
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struct CopySource : RestoreSource
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{
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int fd;
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virtual void operator () (unsigned char * data, unsigned int len)
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{
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readFull(fd, data, len);
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}
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};
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void copyPath(const Path & src, const Path & dst)
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{
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debug(format("copying `%1%' to `%2%'") % src % dst);
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/* Unfortunately C++ doesn't support coprocedures, so we have no
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nice way to chain CopySink and CopySource together. Instead we
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fork off a child to run the sink. (Fork-less platforms should
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use a thread). */
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/* Create a pipe. */
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Pipe pipe;
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pipe.create();
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/* Fork. */
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Pid pid;
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pid = fork();
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switch (pid) {
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case -1:
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throw SysError("unable to fork");
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case 0: /* child */
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try {
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pipe.writeSide.close();
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CopySource source;
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source.fd = pipe.readSide;
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restorePath(dst, source);
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_exit(0);
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} catch (exception & e) {
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cerr << "error: " << e.what() << endl;
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}
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_exit(1);
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}
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/* Parent. */
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pipe.readSide.close();
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CopySink sink;
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sink.fd = pipe.writeSide;
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{
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SwitchToOriginalUser sw;
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dumpPath(src, sink);
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}
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/* Wait for the child to finish. */
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int status = pid.wait(true);
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if (!statusOk(status))
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throw Error(format("cannot copy `%1% to `%2%': child %3%")
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% src % dst % statusToString(status));
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}
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bool isInStore(const Path & path)
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{
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return path[0] == '/'
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&& path.compare(0, nixStore.size(), nixStore) == 0
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&& path.size() >= nixStore.size() + 2
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&& path[nixStore.size()] == '/';
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}
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bool isStorePath(const Path & path)
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{
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return isInStore(path)
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&& path.find('/', nixStore.size() + 1) == Path::npos;
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}
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void assertStorePath(const Path & path)
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{
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if (!isStorePath(path))
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throw Error(format("path `%1%' is not in the Nix store") % path);
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}
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Path toStorePath(const Path & path)
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{
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if (!isInStore(path))
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throw Error(format("path `%1%' is not in the Nix store") % path);
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unsigned int slash = path.find('/', nixStore.size() + 1);
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if (slash == Path::npos)
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return path;
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else
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return Path(path, 0, slash);
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}
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void canonicalisePathMetaData(const Path & path)
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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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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_uid != getuid() || st.st_gid != getgid()) {
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if (chown(path.c_str(), getuid(), getgid()) == -1)
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throw SysError(format("changing owner/group of `%1%' to %2%/%3%")
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% path % getuid() % getgid());
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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 (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);
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}
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}
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static 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 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 Substitutes readSubstitutes(const Transaction & txn,
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const Path & srcPath);
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static bool isRealisablePath(const Transaction & txn, const Path & path)
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{
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return isValidPathTxn(txn, path)
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|| readSubstitutes(txn, path).size() > 0;
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}
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static PathSet getReferers(const Transaction & txn, const Path & storePath)
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{
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Paths referers;
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nixDB.queryStrings(txn, dbReferers, storePath, referers);
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return PathSet(referers.begin(), referers.end());
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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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if (!isRealisablePath(txn, storePath))
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throw Error(
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format("cannot set references for path `%1%' which is invalid and has no substitutes")
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% storePath);
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Paths oldReferences;
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nixDB.queryStrings(txn, dbReferences, storePath, oldReferences);
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nixDB.setStrings(txn, dbReferences, storePath,
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Paths(references.begin(), references.end()));
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/* Update the referers mappings of all 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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{
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PathSet referers = getReferers(txn, *i);
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referers.insert(storePath);
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nixDB.setStrings(txn, dbReferers, *i,
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Paths(referers.begin(), referers.end()));
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}
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/* Remove referer 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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PathSet referers = getReferers(txn, *i);
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referers.erase(storePath);
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nixDB.setStrings(txn, dbReferers, *i,
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Paths(referers.begin(), referers.end()));
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}
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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 (!isRealisablePath(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 queryReferers(const Transaction & txn,
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const Path & storePath, PathSet & referers)
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{
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if (!isRealisablePath(txn, storePath))
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throw Error(format("path `%1%' is not valid") % storePath);
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PathSet referers2 = getReferers(txn, storePath);
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referers.insert(referers2.begin(), referers2.end());
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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 (!isRealisablePath(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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Path queryDeriver(const Transaction & txn, const Path & storePath)
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{
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if (!isRealisablePath(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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static Substitutes readSubstitutes(const Transaction & txn,
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const Path & srcPath)
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{
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Strings ss;
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nixDB.queryStrings(txn, dbSubstitutes, srcPath, ss);
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Substitutes subs;
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for (Strings::iterator i = ss.begin(); i != ss.end(); ++i) {
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if (i->size() < 4 || (*i)[3] != 0) {
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/* Old-style substitute. !!! remove this code
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eventually? */
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break;
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}
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Strings ss2 = unpackStrings(*i);
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if (ss2.size() == 3) {
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/* Another old-style substitute. */
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continue;
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}
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if (ss2.size() != 2) throw Error("malformed substitute");
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Strings::iterator j = ss2.begin();
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Substitute sub;
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sub.program = *j++;
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sub.args = unpackStrings(*j++);
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subs.push_back(sub);
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}
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return subs;
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}
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static void writeSubstitutes(const Transaction & txn,
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const Path & srcPath, const Substitutes & subs)
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{
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Strings ss;
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for (Substitutes::const_iterator i = subs.begin();
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i != subs.end(); ++i)
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{
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Strings ss2;
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ss2.push_back(i->program);
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ss2.push_back(packStrings(i->args));
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ss.push_back(packStrings(ss2));
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}
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nixDB.setStrings(txn, dbSubstitutes, srcPath, ss);
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}
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void registerSubstitute(const Transaction & txn,
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const Path & srcPath, const Substitute & sub)
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{
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assertStorePath(srcPath);
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Substitutes subs = readSubstitutes(txn, srcPath);
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/* New substitutes take precedence over old ones. If the
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substitute is already present, it's moved to the front. */
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remove(subs.begin(), subs.end(), sub);
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subs.push_front(sub);
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writeSubstitutes(txn, srcPath, subs);
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}
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Substitutes querySubstitutes(const Transaction & txn, const Path & srcPath)
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{
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return readSubstitutes(txn, srcPath);
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}
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void clearSubstitutes()
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{
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Transaction txn(nixDB);
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/* Iterate over all paths for which there are substitutes. */
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Paths subKeys;
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nixDB.enumTable(txn, dbSubstitutes, subKeys);
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for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) {
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/* Delete all substitutes for path *i. */
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nixDB.delPair(txn, dbSubstitutes, *i);
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}
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txn.commit();
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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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Path path(canonPath(_path));
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assertStorePath(path);
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assert(hash.type == htSHA256);
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debug(format("registering path `%1%'") % path);
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nixDB.setString(txn, dbValidPaths, path, "sha256:" + printHash(hash));
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setReferences(txn, path, references);
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/* Check that all referenced paths are also valid. */
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for (PathSet::iterator i = references.begin(); i != references.end(); ++i)
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if (!isValidPathTxn(txn, *i))
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throw Error(format("cannot register path `%1%' as valid, since its reference `%2%' is invalid")
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% path % *i);
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setDeriver(txn, path, deriver);
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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 referers. */
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static void invalidatePath(const Path & path, Transaction & txn)
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{
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debug(format("unregistering path `%1%'") % path);
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/* Clear the `references' entry for this path, as well as the
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inverse `referers' entries, and the `derivers' entry; but only
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if there are no substitutes for this path. This maintains the
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cleanup invariant. */
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if (querySubstitutes(txn, path).size() == 0) {
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setReferences(txn, path, PathSet());
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nixDB.delPair(txn, dbDerivers, path);
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}
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nixDB.delPair(txn, dbValidPaths, path);
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}
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Path makeStorePath(const string & type,
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const Hash & hash, const string & suffix)
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{
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/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
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string s = type + ":sha256:" + printHash(hash) + ":"
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+ nixStore + ":" + suffix;
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return nixStore + "/"
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+ printHash32(compressHash(hashString(htSHA256, s), 20))
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+ "-" + suffix;
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}
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Path addToStore(const Path & _srcPath)
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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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Hash h(htSHA256);
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{
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SwitchToOriginalUser sw;
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h = hashPath(htSHA256, srcPath);
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}
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string baseName = baseNameOf(srcPath);
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Path dstPath = makeStorePath("source", h, baseName);
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addTempRoot(dstPath);
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if (!readOnlyMode && !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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PathSet lockPaths;
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lockPaths.insert(dstPath);
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PathLocks outputLock(lockPaths);
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if (!isValidPath(dstPath)) {
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if (pathExists(dstPath)) deletePath(dstPath);
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/* !!! race: srcPath might change between hashPath() and
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here! */
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copyPath(srcPath, dstPath);
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Hash h2 = hashPath(htSHA256, dstPath);
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if (h != h2)
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throw Error(format("contents of `%1%' changed while copying it to `%2%' (%3% -> %4%)")
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% srcPath % dstPath % printHash(h) % printHash(h2));
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canonicalisePathMetaData(dstPath);
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Transaction txn(nixDB);
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registerValidPath(txn, dstPath, h, PathSet(), "");
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txn.commit();
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}
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outputLock.setDeletion(true);
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}
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return dstPath;
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|
}
|
|
|
|
|
|
Path addTextToStore(const string & suffix, const string & s,
|
|
const PathSet & references)
|
|
{
|
|
Hash hash = hashString(htSHA256, s);
|
|
|
|
Path dstPath = makeStorePath("text", hash, suffix);
|
|
|
|
addTempRoot(dstPath);
|
|
|
|
if (!readOnlyMode && !isValidPath(dstPath)) {
|
|
|
|
PathSet lockPaths;
|
|
lockPaths.insert(dstPath);
|
|
PathLocks outputLock(lockPaths);
|
|
|
|
if (!isValidPath(dstPath)) {
|
|
|
|
if (pathExists(dstPath)) deletePath(dstPath);
|
|
|
|
writeStringToFile(dstPath, s);
|
|
|
|
canonicalisePathMetaData(dstPath);
|
|
|
|
Transaction txn(nixDB);
|
|
registerValidPath(txn, dstPath,
|
|
hashPath(htSHA256, dstPath), references, "");
|
|
txn.commit();
|
|
}
|
|
|
|
outputLock.setDeletion(true);
|
|
}
|
|
|
|
return dstPath;
|
|
}
|
|
|
|
|
|
void deleteFromStore(const Path & _path)
|
|
{
|
|
Path path(canonPath(_path));
|
|
|
|
assertStorePath(path);
|
|
|
|
Transaction txn(nixDB);
|
|
if (isValidPathTxn(txn, path)) {
|
|
PathSet referers = getReferers(txn, path);
|
|
if (referers.size() > 1 ||
|
|
(referers.size() == 1 &&
|
|
*referers.begin() != path))
|
|
throw Error(format("cannot delete path `%1%' because it is in use") % path);
|
|
invalidatePath(path, txn);
|
|
}
|
|
txn.commit();
|
|
|
|
deletePath(path);
|
|
}
|
|
|
|
|
|
void verifyStore()
|
|
{
|
|
Transaction txn(nixDB);
|
|
|
|
Paths paths;
|
|
PathSet validPaths;
|
|
nixDB.enumTable(txn, dbValidPaths, paths);
|
|
|
|
for (Paths::iterator i = paths.begin(); i != paths.end(); ++i) {
|
|
Path path = *i;
|
|
if (!pathExists(path)) {
|
|
printMsg(lvlError, format("path `%1%' disappeared") % path);
|
|
invalidatePath(path, txn);
|
|
} else if (!isStorePath(path)) {
|
|
printMsg(lvlError, format("path `%1%' is not in the Nix store") % path);
|
|
invalidatePath(path, txn);
|
|
} else
|
|
validPaths.insert(path);
|
|
}
|
|
|
|
/* "Usable" paths are those that are valid or have a
|
|
substitute. */
|
|
PathSet usablePaths(validPaths);
|
|
|
|
/* Check that the values of the substitute mappings are valid
|
|
paths. */
|
|
Paths subKeys;
|
|
nixDB.enumTable(txn, dbSubstitutes, subKeys);
|
|
for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) {
|
|
Substitutes subs = readSubstitutes(txn, *i);
|
|
if (!isStorePath(*i)) {
|
|
printMsg(lvlError, format("found substitutes for non-store path `%1%'") % *i);
|
|
nixDB.delPair(txn, dbSubstitutes, *i);
|
|
}
|
|
else if (subs.size() == 0)
|
|
nixDB.delPair(txn, dbSubstitutes, *i);
|
|
else
|
|
usablePaths.insert(*i);
|
|
}
|
|
|
|
/* Check the cleanup invariant: only usable paths can have
|
|
`references', `referers', or `derivers' entries. */
|
|
|
|
/* Check the `derivers' table. */
|
|
Paths deriversKeys;
|
|
nixDB.enumTable(txn, dbDerivers, deriversKeys);
|
|
for (Paths::iterator i = deriversKeys.begin();
|
|
i != deriversKeys.end(); ++i)
|
|
{
|
|
if (usablePaths.find(*i) == usablePaths.end()) {
|
|
printMsg(lvlError, format("found deriver entry for unusable path `%1%'")
|
|
% *i);
|
|
nixDB.delPair(txn, dbDerivers, *i);
|
|
}
|
|
else {
|
|
Path deriver = queryDeriver(txn, *i);
|
|
if (!isStorePath(deriver)) {
|
|
printMsg(lvlError, format("found corrupt deriver `%1%' for `%2%'")
|
|
% deriver % *i);
|
|
nixDB.delPair(txn, dbDerivers, *i);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check the `references' table. */
|
|
Paths referencesKeys;
|
|
nixDB.enumTable(txn, dbReferences, referencesKeys);
|
|
for (Paths::iterator i = referencesKeys.begin();
|
|
i != referencesKeys.end(); ++i)
|
|
{
|
|
if (usablePaths.find(*i) == usablePaths.end()) {
|
|
printMsg(lvlError, format("found references entry for unusable path `%1%'")
|
|
% *i);
|
|
nixDB.delPair(txn, dbReferences, *i);
|
|
}
|
|
else {
|
|
PathSet references;
|
|
queryReferences(txn, *i, references);
|
|
for (PathSet::iterator j = references.begin();
|
|
j != references.end(); ++j)
|
|
{
|
|
PathSet referers = getReferers(txn, *j);
|
|
if (referers.find(*i) == referers.end()) {
|
|
printMsg(lvlError, format("missing referer mapping from `%1%' to `%2%'")
|
|
% *j % *i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check the `referers' table. */
|
|
Paths referersKeys;
|
|
nixDB.enumTable(txn, dbReferers, referersKeys);
|
|
for (Paths::iterator i = referersKeys.begin();
|
|
i != referersKeys.end(); ++i)
|
|
{
|
|
if (usablePaths.find(*i) == usablePaths.end()) {
|
|
printMsg(lvlError, format("found referers entry for unusable path `%1%'")
|
|
% *i);
|
|
nixDB.delPair(txn, dbReferers, *i);
|
|
}
|
|
else {
|
|
PathSet referers;
|
|
queryReferers(txn, *i, referers);
|
|
for (PathSet::iterator j = referers.begin();
|
|
j != referers.end(); ++j)
|
|
{
|
|
Paths references;
|
|
nixDB.queryStrings(txn, dbReferences, *j, references);
|
|
if (find(references.begin(), references.end(), *i) == references.end()) {
|
|
printMsg(lvlError, format("missing reference mapping from `%1%' to `%2%'")
|
|
% *j % *i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
txn.commit();
|
|
}
|