From bbe97dff8b3054d96e758f486f9ce3fa09e64de3 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 5 Dec 2019 19:11:09 +0100 Subject: Make the Store API more type-safe Most functions now take a StorePath argument rather than a Path (which is just an alias for std::string). The StorePath constructor ensures that the path is syntactically correct (i.e. it looks like /-). Similarly, functions like buildPaths() now take a StorePathWithOutputs, rather than abusing Path by adding a '!' suffix. Note that the StorePath type is implemented in Rust. This involves some hackery to allow Rust values to be used directly in C++, via a helper type whose destructor calls the Rust type's drop() function. The main issue is the dynamic nature of C++ move semantics: after we have moved a Rust value, we should not call the drop function on the original value. So when we move a value, we set the original value to bitwise zero, and the destructor only calls drop() if the value is not bitwise zero. This should be sufficient for most types. Also lots of minor cleanups to the C++ API to make it more modern (e.g. using std::optional and std::string_view in some places). --- src/nix-env/nix-env.cc | 57 +++++++++++++++++++++++++------------------------- 1 file changed, 28 insertions(+), 29 deletions(-) (limited to 'src/nix-env/nix-env.cc') diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc index a9c743955..a40d0c7e6 100644 --- a/src/nix-env/nix-env.cc +++ b/src/nix-env/nix-env.cc @@ -208,10 +208,11 @@ static long comparePriorities(EvalState & state, DrvInfo & drv1, DrvInfo & drv2) // at a time. static bool isPrebuilt(EvalState & state, DrvInfo & elem) { - Path path = elem.queryOutPath(); + auto path = state.store->parseStorePath(elem.queryOutPath()); if (state.store->isValidPath(path)) return true; - PathSet ps = state.store->querySubstitutablePaths({path}); - return ps.find(path) != ps.end(); + StorePathSet paths; + paths.insert(path.clone()); // FIXME: why doesn't StorePathSet{path.clone()} work? + return state.store->querySubstitutablePaths(paths).count(path); } @@ -371,24 +372,21 @@ static void queryInstSources(EvalState & state, case srcStorePaths: { for (auto & i : args) { - Path path = state.store->followLinksToStorePath(i); + auto path = state.store->followLinksToStorePath(i); - string name = baseNameOf(path); - string::size_type dash = name.find('-'); - if (dash != string::npos) - name = string(name, dash + 1); + std::string name(path.name()); DrvInfo elem(state, "", nullptr); elem.setName(name); - if (isDerivation(path)) { - elem.setDrvPath(path); - elem.setOutPath(state.store->derivationFromPath(path).findOutput("out")); + if (path.isDerivation()) { + elem.setDrvPath(state.store->printStorePath(path)); + elem.setOutPath(state.store->printStorePath(state.store->derivationFromPath(path).findOutput("out"))); if (name.size() >= drvExtension.size() && string(name, name.size() - drvExtension.size()) == drvExtension) name = string(name, 0, name.size() - drvExtension.size()); } - else elem.setOutPath(path); + else elem.setOutPath(state.store->printStorePath(path)); elems.push_back(elem); } @@ -421,13 +419,13 @@ static void queryInstSources(EvalState & state, static void printMissing(EvalState & state, DrvInfos & elems) { - PathSet targets; + std::vector targets; for (auto & i : elems) { Path drvPath = i.queryDrvPath(); if (drvPath != "") - targets.insert(drvPath); + targets.emplace_back(state.store->parseStorePath(drvPath)); else - targets.insert(i.queryOutPath()); + targets.emplace_back(state.store->parseStorePath(i.queryOutPath())); } printMissing(state.store, targets); @@ -697,15 +695,15 @@ static void opSet(Globals & globals, Strings opFlags, Strings opArgs) drv.setName(globals.forceName); if (drv.queryDrvPath() != "") { - PathSet paths = {drv.queryDrvPath()}; + std::vector paths{globals.state->store->parseStorePath(drv.queryDrvPath())}; printMissing(globals.state->store, paths); if (globals.dryRun) return; globals.state->store->buildPaths(paths, globals.state->repair ? bmRepair : bmNormal); - } - else { - printMissing(globals.state->store, {drv.queryOutPath()}); + } else { + printMissing(globals.state->store, + {globals.state->store->parseStorePath(drv.queryOutPath())}); if (globals.dryRun) return; - globals.state->store->ensurePath(drv.queryOutPath()); + globals.state->store->ensurePath(globals.state->store->parseStorePath(drv.queryOutPath())); } debug(format("switching to new user environment")); @@ -729,7 +727,7 @@ static void uninstallDerivations(Globals & globals, Strings & selectors, for (auto & j : selectors) /* !!! the repeated calls to followLinksToStorePath() are expensive, should pre-compute them. */ - if ((isPath(j) && i.queryOutPath() == globals.state->store->followLinksToStorePath(j)) + if ((isPath(j) && globals.state->store->parseStorePath(i.queryOutPath()) == globals.state->store->followLinksToStorePath(j)) || DrvName(j).matches(drvName)) { printInfo("uninstalling '%s'", i.queryName()); @@ -953,12 +951,13 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs) /* Query which paths have substitutes. */ - PathSet validPaths, substitutablePaths; + StorePathSet validPaths; + StorePathSet substitutablePaths; if (printStatus || globals.prebuiltOnly) { - PathSet paths; + StorePathSet paths; for (auto & i : elems) try { - paths.insert(i.queryOutPath()); + paths.insert(globals.state->store->parseStorePath(i.queryOutPath())); } catch (AssertionError & e) { printMsg(lvlTalkative, "skipping derivation named '%s' which gives an assertion failure", i.queryName()); i.setFailed(); @@ -989,8 +988,8 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs) //Activity act(*logger, lvlDebug, format("outputting query result '%1%'") % i.attrPath); if (globals.prebuiltOnly && - validPaths.find(i.queryOutPath()) == validPaths.end() && - substitutablePaths.find(i.queryOutPath()) == substitutablePaths.end()) + !validPaths.count(globals.state->store->parseStorePath(i.queryOutPath())) && + !substitutablePaths.count(globals.state->store->parseStorePath(i.queryOutPath()))) continue; /* For table output. */ @@ -1001,9 +1000,9 @@ static void opQuery(Globals & globals, Strings opFlags, Strings opArgs) if (printStatus) { Path outPath = i.queryOutPath(); - bool hasSubs = substitutablePaths.find(outPath) != substitutablePaths.end(); + bool hasSubs = substitutablePaths.count(globals.state->store->parseStorePath(outPath)); bool isInstalled = installed.find(outPath) != installed.end(); - bool isValid = validPaths.find(outPath) != validPaths.end(); + bool isValid = validPaths.count(globals.state->store->parseStorePath(outPath)); if (xmlOutput) { attrs["installed"] = isInstalled ? "1" : "0"; attrs["valid"] = isValid ? "1" : "0"; @@ -1347,7 +1346,7 @@ static int _main(int argc, char * * argv) using LegacyArgs::LegacyArgs; }; - MyArgs myArgs(baseNameOf(argv[0]), [&](Strings::iterator & arg, const Strings::iterator & end) { + MyArgs myArgs(std::string(baseNameOf(argv[0])), [&](Strings::iterator & arg, const Strings::iterator & end) { Operation oldOp = op; if (*arg == "--help") -- cgit v1.2.3