2003-06-23 15:27:59 +02:00
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#include <iostream>
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#include <sys/types.h>
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#include <sys/wait.h>
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2003-07-07 09:43:58 +02:00
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#include "store.hh"
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2003-06-16 15:33:38 +02:00
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#include "globals.hh"
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#include "db.hh"
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2003-06-23 15:27:59 +02:00
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#include "archive.hh"
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2003-07-10 17:11:48 +02:00
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#include "fstate.hh"
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2003-06-23 15:27:59 +02:00
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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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if (write(fd, (char *) data, len) != (ssize_t) len)
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throw SysError("writing to child");
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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 () (const unsigned char * data, unsigned int len)
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{
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ssize_t res = read(fd, (char *) data, len);
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if (res == -1)
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throw SysError("reading from parent");
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if (res != (ssize_t) len)
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throw Error("not enough data available on parent");
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}
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};
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2003-06-16 15:33:38 +02:00
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2003-07-06 16:20:47 +02:00
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void copyPath(string src, string dst)
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2003-06-16 15:33:38 +02:00
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{
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2003-06-23 15:27:59 +02:00
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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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int fds[2];
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if (pipe(fds) == -1) throw SysError("creating pipe");
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/* Fork. */
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pid_t pid;
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switch (pid = fork()) {
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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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close(fds[1]);
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CopySource source;
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source.fd = fds[0];
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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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close(fds[0]);
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/* Parent. */
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CopySink sink;
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sink.fd = fds[1];
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dumpPath(src, sink);
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/* Wait for the child to finish. */
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int status;
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if (waitpid(pid, &status, 0) != pid)
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throw SysError("waiting for child");
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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throw Error("cannot copy file: child died");
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2003-06-16 15:33:38 +02:00
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}
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2003-07-10 17:11:48 +02:00
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void registerSubstitute(const Hash & srcHash, const Hash & subHash)
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{
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Strings subs;
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queryListDB(nixDB, dbSubstitutes, srcHash, subs); /* non-existence = ok */
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for (Strings::iterator it = subs.begin(); it != subs.end(); it++)
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if (parseHash(*it) == subHash) return;
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subs.push_back(subHash);
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setListDB(nixDB, dbSubstitutes, srcHash, subs);
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}
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2003-07-07 11:25:26 +02:00
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Hash registerPath(const string & _path, Hash hash)
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{
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string path(canonPath(_path));
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if (hash == Hash()) hash = hashPath(path);
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Strings paths;
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2003-07-08 10:35:06 +02:00
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queryListDB(nixDB, dbHash2Paths, hash, paths); /* non-existence = ok */
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2003-07-07 11:25:26 +02:00
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for (Strings::iterator it = paths.begin();
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it != paths.end(); it++)
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if (*it == path) goto exists;
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paths.push_back(path);
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2003-07-08 10:35:06 +02:00
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setListDB(nixDB, dbHash2Paths, hash, paths);
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2003-07-07 11:25:26 +02:00
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exists:
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return hash;
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}
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2003-07-08 11:54:47 +02:00
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void unregisterPath(const string & _path)
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{
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string path(canonPath(_path));
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Hash hash = hashPath(path);
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Strings paths, paths2;
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queryListDB(nixDB, dbHash2Paths, hash, paths); /* non-existence = ok */
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bool changed = false;
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for (Strings::iterator it = paths.begin();
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it != paths.end(); it++)
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if (*it != path) paths2.push_back(*it); else changed = true;
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if (changed)
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setListDB(nixDB, dbHash2Paths, hash, paths2);
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}
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2003-07-07 11:25:26 +02:00
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bool isInPrefix(const string & path, const string & _prefix)
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{
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string prefix = canonPath(_prefix + "/");
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return string(path, 0, prefix.size()) == prefix;
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}
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2003-07-10 15:41:28 +02:00
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string expandHash(const Hash & hash, const string & target,
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const string & prefix)
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2003-07-07 11:25:26 +02:00
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{
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Strings paths;
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2003-07-10 15:41:28 +02:00
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if (!target.empty() && !isInPrefix(target, prefix))
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abort();
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2003-07-10 17:11:48 +02:00
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queryListDB(nixDB, dbHash2Paths, hash, paths);
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2003-07-07 11:25:26 +02:00
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2003-07-10 15:41:28 +02:00
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/* !!! we shouldn't check for staleness by default --- too slow */
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/* Pick one equal to `target'. */
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if (!target.empty()) {
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for (Strings::iterator i = paths.begin();
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i != paths.end(); i++)
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{
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string path = *i;
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try {
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if (path == target && hashPath(path) == hash)
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return path;
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} catch (Error & e) {
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debug(format("stale path: %1%") % e.msg());
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/* try next one */
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}
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}
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}
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2003-07-07 11:25:26 +02:00
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2003-07-10 15:41:28 +02:00
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/* Arbitrarily pick the first one that exists and isn't stale. */
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2003-07-07 11:25:26 +02:00
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for (Strings::iterator it = paths.begin();
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it != paths.end(); it++)
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{
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string path = *it;
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try {
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2003-07-10 15:41:28 +02:00
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if (isInPrefix(path, prefix) && hashPath(path) == hash) {
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if (target.empty())
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return path;
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else {
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copyPath(path, target);
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return target;
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}
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}
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2003-07-07 11:25:26 +02:00
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} catch (Error & e) {
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2003-07-10 15:41:28 +02:00
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debug(format("stale path: %1%") % e.msg());
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2003-07-07 11:25:26 +02:00
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/* try next one */
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}
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}
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2003-07-10 17:11:48 +02:00
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/* Try to realise the substitutes. */
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Strings subs;
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queryListDB(nixDB, dbSubstitutes, hash, subs); /* non-existence = ok */
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for (Strings::iterator it = subs.begin(); it != subs.end(); it++) {
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StringSet dummy;
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FState nf = realiseFState(hash2fstate(parseHash(*it)), dummy);
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string path = fstatePath(nf);
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if (hashPath(path) != hash)
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throw Error(format("bad substitute in `%1%'") % (string) path);
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if (target.empty())
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return path; /* !!! prefix */
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else {
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if (path != target) {
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copyPath(path, target);
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registerPath(target, hash);
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}
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return target;
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}
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}
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2003-07-07 11:25:26 +02:00
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2003-07-10 17:11:48 +02:00
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throw Error(format("cannot expand hash `%1%'") % (string) hash);
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2003-07-07 11:25:26 +02:00
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}
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2003-07-09 18:12:40 +02:00
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2003-06-27 15:55:12 +02:00
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void addToStore(string srcPath, string & dstPath, Hash & hash)
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2003-06-16 15:33:38 +02:00
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{
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2003-06-27 15:55:12 +02:00
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srcPath = absPath(srcPath);
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2003-06-17 23:12:58 +02:00
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2003-06-27 15:55:12 +02:00
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hash = hashPath(srcPath);
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2003-06-16 15:33:38 +02:00
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2003-07-07 11:25:26 +02:00
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try {
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2003-07-10 17:11:48 +02:00
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/* !!! should not use the substitutes! */
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2003-07-10 15:41:28 +02:00
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dstPath = expandHash(hash, "", nixStore);
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2003-06-27 15:55:12 +02:00
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return;
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2003-07-07 11:25:26 +02:00
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} catch (...) {
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2003-06-16 15:33:38 +02:00
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}
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2003-07-07 11:25:26 +02:00
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2003-06-27 15:55:12 +02:00
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string baseName = baseNameOf(srcPath);
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2003-07-08 22:26:22 +02:00
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dstPath = canonPath(nixStore + "/" + (string) hash + "-" + baseName);
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2003-06-16 15:33:38 +02:00
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2003-07-06 16:20:47 +02:00
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copyPath(srcPath, dstPath);
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2003-06-16 15:33:38 +02:00
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2003-07-07 11:25:26 +02:00
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registerPath(dstPath, hash);
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2003-06-16 15:33:38 +02:00
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}
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2003-06-27 16:56:12 +02:00
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void deleteFromStore(const string & path)
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2003-06-23 16:40:49 +02:00
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{
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2003-07-09 18:12:40 +02:00
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string prefix = + "/";
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if (!isInPrefix(path, nixStore))
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2003-06-27 16:56:12 +02:00
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throw Error(format("path %1% is not in the store") % path);
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2003-07-08 11:54:47 +02:00
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unregisterPath(path);
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2003-06-27 16:56:12 +02:00
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deletePath(path);
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2003-06-23 16:40:49 +02:00
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}
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