diff options
Diffstat (limited to 'src/libstore/local-store.cc')
| -rw-r--r-- | src/libstore/local-store.cc | 227 |
1 files changed, 25 insertions, 202 deletions
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc index baf3a528b7..45ffbad67a 100644 --- a/src/libstore/local-store.cc +++ b/src/libstore/local-store.cc @@ -5,12 +5,11 @@ #include "pathlocks.hh" #include "worker-protocol.hh" #include "derivations.hh" -#include "affinity.hh" +#include "nar-info.hh" #include <iostream> #include <algorithm> #include <cstring> -#include <atomic> #include <sys/types.h> #include <sys/stat.h> @@ -220,19 +219,6 @@ LocalStore::~LocalStore() auto state(_state.lock()); try { - for (auto & i : state->runningSubstituters) { - if (i.second.disabled) continue; - i.second.to.close(); - i.second.from.close(); - i.second.error.close(); - if (i.second.pid != -1) - i.second.pid.wait(true); - } - } catch (...) { - ignoreException(); - } - - try { if (state->fdTempRoots != -1) { state->fdTempRoots.close(); unlink(state->fnTempRoots.c_str()); @@ -792,205 +778,42 @@ Path LocalStore::queryPathFromHashPart(const string & hashPart) } -void LocalStore::setSubstituterEnv() -{ - static std::atomic_flag done; - - if (done.test_and_set()) return; - - /* Pass configuration options (including those overridden with - --option) to substituters. */ - setenv("_NIX_OPTIONS", settings.pack().c_str(), 1); -} - - -void LocalStore::startSubstituter(const Path & substituter, RunningSubstituter & run) -{ - if (run.disabled || run.pid != -1) return; - - debug(format("starting substituter program ‘%1%’") % substituter); - - Pipe toPipe, fromPipe, errorPipe; - - toPipe.create(); - fromPipe.create(); - errorPipe.create(); - - setSubstituterEnv(); - - run.pid = startProcess([&]() { - if (dup2(toPipe.readSide, STDIN_FILENO) == -1) - throw SysError("dupping stdin"); - if (dup2(fromPipe.writeSide, STDOUT_FILENO) == -1) - throw SysError("dupping stdout"); - if (dup2(errorPipe.writeSide, STDERR_FILENO) == -1) - throw SysError("dupping stderr"); - execl(substituter.c_str(), substituter.c_str(), "--query", NULL); - throw SysError(format("executing ‘%1%’") % substituter); - }); - - run.program = baseNameOf(substituter); - run.to = toPipe.writeSide.borrow(); - run.from = run.fromBuf.fd = fromPipe.readSide.borrow(); - run.error = errorPipe.readSide.borrow(); - - toPipe.readSide.close(); - fromPipe.writeSide.close(); - errorPipe.writeSide.close(); - - /* The substituter may exit right away if it's disabled in any way - (e.g. copy-from-other-stores.pl will exit if no other stores - are configured). */ - try { - getLineFromSubstituter(run); - } catch (EndOfFile & e) { - run.to.close(); - run.from.close(); - run.error.close(); - run.disabled = true; - if (run.pid.wait(true) != 0) throw; - } -} - - -/* Read a line from the substituter's stdout, while also processing - its stderr. */ -string LocalStore::getLineFromSubstituter(RunningSubstituter & run) -{ - string res, err; - - /* We might have stdout data left over from the last time. */ - if (run.fromBuf.hasData()) goto haveData; - - while (1) { - checkInterrupt(); - - fd_set fds; - FD_ZERO(&fds); - FD_SET(run.from, &fds); - FD_SET(run.error, &fds); - - /* Wait for data to appear on the substituter's stdout or - stderr. */ - if (select(run.from > run.error ? run.from + 1 : run.error + 1, &fds, 0, 0, 0) == -1) { - if (errno == EINTR) continue; - throw SysError("waiting for input from the substituter"); - } - - /* Completely drain stderr before dealing with stdout. */ - if (FD_ISSET(run.error, &fds)) { - char buf[4096]; - ssize_t n = read(run.error, (unsigned char *) buf, sizeof(buf)); - if (n == -1) { - if (errno == EINTR) continue; - throw SysError("reading from substituter's stderr"); - } - if (n == 0) throw EndOfFile(format("substituter ‘%1%’ died unexpectedly") % run.program); - err.append(buf, n); - string::size_type p; - while ((p = err.find('\n')) != string::npos) { - printMsg(lvlError, run.program + ": " + string(err, 0, p)); - err = string(err, p + 1); - } - } - - /* Read from stdout until we get a newline or the buffer is empty. */ - else if (run.fromBuf.hasData() || FD_ISSET(run.from, &fds)) { - haveData: - do { - unsigned char c; - run.fromBuf(&c, 1); - if (c == '\n') { - if (!err.empty()) printMsg(lvlError, run.program + ": " + err); - return res; - } - res += c; - } while (run.fromBuf.hasData()); - } - } -} - - -template<class T> T LocalStore::getIntLineFromSubstituter(RunningSubstituter & run) -{ - string s = getLineFromSubstituter(run); - T res; - if (!string2Int(s, res)) throw Error("integer expected from stream"); - return res; -} - - PathSet LocalStore::querySubstitutablePaths(const PathSet & paths) { - auto state(_state.lock()); - PathSet res; - for (auto & i : settings.substituters) { - if (res.size() == paths.size()) break; - RunningSubstituter & run(state->runningSubstituters[i]); - startSubstituter(i, run); - if (run.disabled) continue; - string s = "have "; - for (auto & j : paths) - if (res.find(j) == res.end()) { s += j; s += " "; } - writeLine(run.to, s); - while (true) { - /* FIXME: we only read stderr when an error occurs, so - substituters should only write (short) messages to - stderr when they fail. I.e. they shouldn't write debug - output. */ - Path path = getLineFromSubstituter(run); - if (path == "") break; - res.insert(path); + for (auto & sub : getDefaultSubstituters()) { + for (auto & path : paths) { + if (res.count(path)) continue; + debug(format("checking substituter ‘%s’ for path ‘%s’") + % sub->getUri() % path); + if (sub->isValidPath(path)) + res.insert(path); } } - return res; } -void LocalStore::querySubstitutablePathInfos(const Path & substituter, - PathSet & paths, SubstitutablePathInfos & infos) -{ - auto state(_state.lock()); - - RunningSubstituter & run(state->runningSubstituters[substituter]); - startSubstituter(substituter, run); - if (run.disabled) return; - - string s = "info "; - for (auto & i : paths) - if (infos.find(i) == infos.end()) { s += i; s += " "; } - writeLine(run.to, s); - - while (true) { - Path path = getLineFromSubstituter(run); - if (path == "") break; - if (paths.find(path) == paths.end()) - throw Error(format("got unexpected path ‘%1%’ from substituter") % path); - paths.erase(path); - SubstitutablePathInfo & info(infos[path]); - info.deriver = getLineFromSubstituter(run); - if (info.deriver != "") assertStorePath(info.deriver); - int nrRefs = getIntLineFromSubstituter<int>(run); - while (nrRefs--) { - Path p = getLineFromSubstituter(run); - assertStorePath(p); - info.references.insert(p); - } - info.downloadSize = getIntLineFromSubstituter<long long>(run); - info.narSize = getIntLineFromSubstituter<long long>(run); - } -} - - void LocalStore::querySubstitutablePathInfos(const PathSet & paths, SubstitutablePathInfos & infos) { - PathSet todo = paths; - for (auto & i : settings.substituters) { - if (todo.empty()) break; - querySubstitutablePathInfos(i, todo, infos); + for (auto & sub : getDefaultSubstituters()) { + for (auto & path : paths) { + if (infos.count(path)) continue; + debug(format("checking substituter ‘%s’ for path ‘%s’") + % sub->getUri() % path); + try { + auto info = sub->queryPathInfo(path); + auto narInfo = std::dynamic_pointer_cast<const NarInfo>( + std::shared_ptr<const ValidPathInfo>(info)); + infos[path] = SubstitutablePathInfo{ + info->deriver, + info->references, + narInfo ? narInfo->fileSize : 0, + info->narSize}; + } catch (InvalidPath) { + } + } } } |