diff options
Diffstat (limited to 'src/libstore/local-store.cc')
| -rw-r--r-- | src/libstore/local-store.cc | 233 |
1 files changed, 42 insertions, 191 deletions
diff --git a/src/libstore/local-store.cc b/src/libstore/local-store.cc index 1165335125..bffefbaa78 100644 --- a/src/libstore/local-store.cc +++ b/src/libstore/local-store.cc @@ -48,22 +48,6 @@ static TableId dbReferences = 0; referrer. */ static TableId dbReferrers = 0; -/* dbSubstitutes :: Path -> [[Path]] - - Each pair $(p, subs)$ tells Nix that it can use any of the - substitutes in $subs$ to build path $p$. Each substitute defines a - command-line invocation of a program (i.e., the first list element - is the full path to the program, the remaining elements are - arguments). - - The main purpose of this is for distributed caching of derivates. - One system can compute a derivate and put it on a website (as a Nix - archive), for instance, and then another system can register a - substitute for that derivate. The substitute in this case might be - a Nix derivation that fetches the Nix archive. -*/ -static TableId dbSubstitutes = 0; - /* dbDerivers :: Path -> [Path] This table lists the derivation used to build a path. There can @@ -72,13 +56,6 @@ static TableId dbSubstitutes = 0; static TableId dbDerivers = 0; -bool Substitute::operator == (const Substitute & sub) const -{ - return program == sub.program - && args == sub.args; -} - - static void upgradeStore07(); static void upgradeStore09(); @@ -103,6 +80,8 @@ void checkStoreNotSymlink() LocalStore::LocalStore(bool reserveSpace) { + substitutablePathsLoaded = false; + if (readOnlyMode) return; checkStoreNotSymlink(); @@ -133,7 +112,6 @@ LocalStore::LocalStore(bool reserveSpace) dbValidPaths = nixDB.openTable("validpaths"); dbReferences = nixDB.openTable("references"); dbReferrers = nixDB.openTable("referrers", true); /* must be sorted */ - dbSubstitutes = nixDB.openTable("substitutes"); dbDerivers = nixDB.openTable("derivers"); int curSchema = 0; @@ -280,17 +258,6 @@ bool LocalStore::isValidPath(const Path & path) } -static Substitutes readSubstitutes(const Transaction & txn, - const Path & srcPath); - - -static bool isRealisablePath(const Transaction & txn, const Path & path) -{ - return isValidPathTxn(txn, path) - || readSubstitutes(txn, path).size() > 0; -} - - static string addPrefix(const string & prefix, const string & s) { return prefix + string(1, (char) 0) + s; @@ -322,11 +289,10 @@ static PathSet getReferrers(const Transaction & txn, const Path & storePath) void setReferences(const Transaction & txn, const Path & storePath, const PathSet & references) { - /* For unrealisable paths, we can only clear the references. */ - if (references.size() > 0 && !isRealisablePath(txn, storePath)) + /* For invalid paths, we can only clear the references. */ + if (references.size() > 0 && !isValidPathTxn(txn, storePath)) throw Error( - format("cannot set references for path `%1%' which is invalid and has no substitutes") - % storePath); + format("cannot set references for invalid path `%1%'") % storePath); Paths oldReferences; nixDB.queryStrings(txn, dbReferences, storePath, oldReferences); @@ -356,7 +322,7 @@ void queryReferences(const Transaction & txn, const Path & storePath, PathSet & references) { Paths references2; - if (!isRealisablePath(txn, storePath)) + if (!isValidPathTxn(txn, storePath)) throw Error(format("path `%1%' is not valid") % storePath); nixDB.queryStrings(txn, dbReferences, storePath, references2); references.insert(references2.begin(), references2.end()); @@ -373,7 +339,7 @@ void LocalStore::queryReferences(const Path & storePath, void queryReferrers(const Transaction & txn, const Path & storePath, PathSet & referrers) { - if (!isRealisablePath(txn, storePath)) + if (!isValidPathTxn(txn, storePath)) throw Error(format("path `%1%' is not valid") % storePath); PathSet referrers2 = getReferrers(txn, storePath); referrers.insert(referrers2.begin(), referrers2.end()); @@ -393,7 +359,7 @@ void setDeriver(const Transaction & txn, const Path & storePath, assertStorePath(storePath); if (deriver == "") return; assertStorePath(deriver); - if (!isRealisablePath(txn, storePath)) + if (!isValidPathTxn(txn, storePath)) throw Error(format("path `%1%' is not valid") % storePath); nixDB.setString(txn, dbDerivers, storePath, deriver); } @@ -401,7 +367,7 @@ void setDeriver(const Transaction & txn, const Path & storePath, static Path queryDeriver(const Transaction & txn, const Path & storePath) { - if (!isRealisablePath(txn, storePath)) + if (!isValidPathTxn(txn, storePath)) throw Error(format("path `%1%' is not valid") % storePath); Path deriver; if (nixDB.queryString(txn, dbDerivers, storePath, deriver)) @@ -417,119 +383,33 @@ Path LocalStore::queryDeriver(const Path & path) } -const int substituteVersion = 2; - - -static Substitutes readSubstitutes(const Transaction & txn, - const Path & srcPath) +PathSet LocalStore::querySubstitutablePaths() { - Strings ss; - nixDB.queryStrings(txn, dbSubstitutes, srcPath, ss); - - Substitutes subs; - - for (Strings::iterator i = ss.begin(); i != ss.end(); ++i) { - if (i->size() < 4 || (*i)[3] != 0) { - /* Old-style substitute. !!! remove this code - eventually? */ - break; + if (!substitutablePathsLoaded) { + for (Paths::iterator i = substituters.begin(); i != substituters.end(); ++i) { + debug(format("running `%1%' to find out substitutable paths") % *i); + Strings args; + args.push_back("--query-paths"); + Strings ss = tokenizeString(runProgram(*i, false, args), "\n"); + for (Strings::iterator j = ss.begin(); j != ss.end(); ++j) { + if (!isStorePath(*j)) + throw Error(format("`%1%' returned a bad substitutable path `%2%'") + % *i % *j); + substitutablePaths.insert(*j); + } } - Strings ss2 = unpackStrings(*i); - if (ss2.size() == 0) continue; - int version; - if (!string2Int(ss2.front(), version)) continue; - if (version != substituteVersion) continue; - if (ss2.size() != 4) throw Error("malformed substitute"); - Strings::iterator j = ss2.begin(); - j++; - Substitute sub; - sub.deriver = *j++; - sub.program = *j++; - sub.args = unpackStrings(*j++); - subs.push_back(sub); - } - - return subs; -} - - -static void writeSubstitutes(const Transaction & txn, - const Path & srcPath, const Substitutes & subs) -{ - Strings ss; - - for (Substitutes::const_iterator i = subs.begin(); - i != subs.end(); ++i) - { - Strings ss2; - ss2.push_back((format("%1%") % substituteVersion).str()); - ss2.push_back(i->deriver); - ss2.push_back(i->program); - ss2.push_back(packStrings(i->args)); - ss.push_back(packStrings(ss2)); + substitutablePathsLoaded = true; } - nixDB.setStrings(txn, dbSubstitutes, srcPath, ss); + return substitutablePaths; } -void registerSubstitute(const Transaction & txn, - const Path & srcPath, const Substitute & sub) +bool LocalStore::hasSubstitutes(const Path & path) { - assertStorePath(srcPath); - - Substitutes subs = readSubstitutes(txn, srcPath); - - if (find(subs.begin(), subs.end(), sub) != subs.end()) - return; - - /* New substitutes take precedence over old ones. If the - substitute is already present, it's moved to the front. */ - remove(subs.begin(), subs.end(), sub); - subs.push_front(sub); - - writeSubstitutes(txn, srcPath, subs); -} - - -Substitutes querySubstitutes(const Transaction & txn, const Path & path) -{ - return readSubstitutes(txn, path); -} - - -Substitutes LocalStore::querySubstitutes(const Path & path) -{ - return nix::querySubstitutes(noTxn, path); -} - - -static void invalidatePath(Transaction & txn, const Path & path); - - -void clearSubstitutes() -{ - Transaction txn(nixDB); - - /* Iterate over all paths for which there are substitutes. */ - Paths subKeys; - nixDB.enumTable(txn, dbSubstitutes, subKeys); - for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) { - - /* Delete all substitutes for path *i. */ - nixDB.delPair(txn, dbSubstitutes, *i); - - /* Maintain the cleanup invariant. */ - if (!isValidPathTxn(txn, *i)) - invalidatePath(txn, *i); - } - - /* !!! there should be no referrers to any of the invalid - substitutable paths. This should be the case by construction - (the only referrers can be other invalid substitutable paths, - which have all been removed now). */ - - txn.commit(); + if (!substitutablePathsLoaded) + querySubstitutablePaths(); + return substitutablePaths.find(path) != substitutablePaths.end(); } @@ -615,17 +495,12 @@ void registerValidPaths(const Transaction & txn, there are no referrers. */ static void invalidatePath(Transaction & txn, const Path & path) { - debug(format("unregistering path `%1%'") % path); + debug(format("invalidating path `%1%'") % path); /* Clear the `references' entry for this path, as well as the - inverse `referrers' entries, and the `derivers' entry; but only - if there are no substitutes for this path. This maintains the - cleanup invariant. */ - if (querySubstitutes(txn, path).size() == 0) { - setReferences(txn, path, PathSet()); - nixDB.delPair(txn, dbDerivers, path); - } - + inverse `referrers' entries, and the `derivers' entry. */ + setReferences(txn, path, PathSet()); + nixDB.delPair(txn, dbDerivers, path); nixDB.delPair(txn, dbValidPaths, path); } @@ -967,30 +842,7 @@ void verifyStore(bool checkContents) } - printMsg(lvlInfo, "checking path realisability"); - - /* "Realisable" paths are those that are valid or have a - substitute. */ - PathSet realisablePaths(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("removing substitutes for non-store path `%1%'") % *i); - nixDB.delPair(txn, dbSubstitutes, *i); - } - else if (subs.size() == 0) - nixDB.delPair(txn, dbSubstitutes, *i); - else - realisablePaths.insert(*i); - } - - - /* Check the cleanup invariant: only realisable paths can have + /* Check the cleanup invariant: only valid paths can have `references', `referrers', or `derivers' entries. */ @@ -1001,8 +853,8 @@ void verifyStore(bool checkContents) for (Paths::iterator i = deriversKeys.begin(); i != deriversKeys.end(); ++i) { - if (realisablePaths.find(*i) == realisablePaths.end()) { - printMsg(lvlError, format("removing deriver entry for unrealisable path `%1%'") + if (validPaths.find(*i) == validPaths.end()) { + printMsg(lvlError, format("removing deriver entry for invalid path `%1%'") % *i); nixDB.delPair(txn, dbDerivers, *i); } @@ -1024,13 +876,12 @@ void verifyStore(bool checkContents) for (Paths::iterator i = referencesKeys.begin(); i != referencesKeys.end(); ++i) { - if (realisablePaths.find(*i) == realisablePaths.end()) { - printMsg(lvlError, format("removing references entry for unrealisable path `%1%'") + if (validPaths.find(*i) == validPaths.end()) { + printMsg(lvlError, format("removing references entry for invalid path `%1%'") % *i); setReferences(txn, *i, PathSet()); } else { - bool isValid = validPaths.find(*i) != validPaths.end(); PathSet references; queryReferences(txn, *i, references); for (PathSet::iterator j = references.begin(); @@ -1042,7 +893,7 @@ void verifyStore(bool checkContents) % *j % *i); nixDB.setString(txn, dbReferrers, addPrefix(*j, *i), ""); } - if (isValid && validPaths.find(*j) == validPaths.end()) { + if (validPaths.find(*j) == validPaths.end()) { printMsg(lvlError, format("incomplete closure: `%1%' needs missing `%2%'") % *i % *j); } @@ -1066,14 +917,14 @@ void verifyStore(bool checkContents) Path to(*i, 0, nul); Path from(*i, nul + 1); - if (realisablePaths.find(to) == realisablePaths.end()) { - printMsg(lvlError, format("removing referrer entry from `%1%' to unrealisable `%2%'") + 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 (realisablePaths.find(from) == realisablePaths.end()) { - printMsg(lvlError, format("removing referrer entry from unrealisable `%1%' to `%2%'") + 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); } |