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Eliminate the "store" global variable

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Also, move a few free-standing functions into StoreAPI and Derivation.

Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)
This commit is contained in:
Eelco Dolstra 2016-02-04 14:28:26 +01:00
parent 4f7824c58e
commit c10c61449f
36 changed files with 511 additions and 458 deletions
Download patch file Download diff file Expand all files Collapse all files

59
src/nix-store/nix-store.cc
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@ -1,14 +1,14 @@
#include "globals.hh"
#include "misc.hh"
#include "archive.hh"
#include "shared.hh"
#include "derivations.hh"
#include "dotgraph.hh"
#include "xmlgraph.hh"
#include "globals.hh"
#include "local-store.hh"
#include "util.hh"
#include "serve-protocol.hh"
#include "worker-protocol.hh"
#include "monitor-fd.hh"
#include "serve-protocol.hh"
#include "shared.hh"
#include "util.hh"
#include "worker-protocol.hh"
#include "xmlgraph.hh"
#include <iostream>
#include <algorithm>
@ -37,6 +37,7 @@ static Path gcRoot;
static int rootNr = 0;
static bool indirectRoot = false;
static bool noOutput = false;
static std::shared_ptr<StoreAPI> store;
LocalStore & ensureLocalStore()
@ -65,7 +66,7 @@ static PathSet realisePath(Path path, bool build = true)
if (isDerivation(p.first)) {
if (build) store->buildPaths(singleton<PathSet>(path));
Derivation drv = derivationFromPath(*store, p.first);
Derivation drv = store->derivationFromPath(p.first);
rootNr++;
if (p.second.empty())
@ -83,7 +84,7 @@ static PathSet realisePath(Path path, bool build = true)
Path rootName = gcRoot;
if (rootNr > 1) rootName += "-" + std::to_string(rootNr);
if (i->first != "out") rootName += "-" + i->first;
outPath = addPermRoot(*store, outPath, rootName, indirectRoot);
outPath = addPermRoot(ref<StoreAPI>(store), outPath, rootName, indirectRoot);
}
outputs.insert(outPath);
}
@ -99,7 +100,7 @@ static PathSet realisePath(Path path, bool build = true)
Path rootName = gcRoot;
rootNr++;
if (rootNr > 1) rootName += "-" + std::to_string(rootNr);
path = addPermRoot(*store, path, rootName, indirectRoot);
path = addPermRoot(ref<StoreAPI>(store), path, rootName, indirectRoot);
}
return singleton<PathSet>(path);
}
@ -129,7 +130,7 @@ static void opRealise(Strings opFlags, Strings opArgs)
unsigned long long downloadSize, narSize;
PathSet willBuild, willSubstitute, unknown;
queryMissing(*store, PathSet(paths.begin(), paths.end()),
store->queryMissing(PathSet(paths.begin(), paths.end()),
willBuild, willSubstitute, unknown, downloadSize, narSize);
if (ignoreUnknown) {
@ -141,7 +142,7 @@ static void opRealise(Strings opFlags, Strings opArgs)
}
if (settings.get("print-missing", true))
printMissing(*store, willBuild, willSubstitute, unknown, downloadSize, narSize);
printMissing(ref<StoreAPI>(store), willBuild, willSubstitute, unknown, downloadSize, narSize);
if (dryRun) return;
@ -216,7 +217,7 @@ static PathSet maybeUseOutputs(const Path & storePath, bool useOutput, bool forc
{
if (forceRealise) realisePath(storePath);
if (useOutput && isDerivation(storePath)) {
Derivation drv = derivationFromPath(*store, storePath);
Derivation drv = store->derivationFromPath(storePath);
PathSet outputs;
for (auto & i : drv.outputs)
outputs.insert(i.second.path);
@ -253,7 +254,7 @@ static void printTree(const Path & path,
closure(B). That is, if derivation A is an (possibly indirect)
input of B, then A is printed first. This has the effect of
flattening the tree, preventing deeply nested structures. */
Paths sorted = topoSortPaths(*store, references);
Paths sorted = store->topoSortPaths(references);
reverse(sorted.begin(), sorted.end());
for (auto i = sorted.begin(); i != sorted.end(); ++i) {
@ -318,7 +319,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (auto & i : opArgs) {
i = followLinksToStorePath(i);
if (forceRealise) realisePath(i);
Derivation drv = derivationFromPath(*store, i);
Derivation drv = store->derivationFromPath(i);
for (auto & j : drv.outputs)
cout << format("%1%\n") % j.second.path;
}
@ -333,13 +334,13 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (auto & i : opArgs) {
PathSet ps = maybeUseOutputs(followLinksToStorePath(i), useOutput, forceRealise);
for (auto & j : ps) {
if (query == qRequisites) computeFSClosure(*store, j, paths, false, includeOutputs);
if (query == qRequisites) store->computeFSClosure(j, paths, false, includeOutputs);
else if (query == qReferences) store->queryReferences(j, paths);
else if (query == qReferrers) store->queryReferrers(j, paths);
else if (query == qReferrersClosure) computeFSClosure(*store, j, paths, true);
else if (query == qReferrersClosure) store->computeFSClosure(j, paths, true);
}
}
Paths sorted = topoSortPaths(*store, paths);
Paths sorted = store->topoSortPaths(paths);
for (Paths::reverse_iterator i = sorted.rbegin();
i != sorted.rend(); ++i)
cout << format("%s\n") % *i;
@ -357,7 +358,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
case qBinding:
for (auto & i : opArgs) {
Path path = useDeriver(followLinksToStorePath(i));
Derivation drv = derivationFromPath(*store, path);
Derivation drv = store->derivationFromPath(path);
StringPairs::iterator j = drv.env.find(bindingName);
if (j == drv.env.end())
throw Error(format("derivation ‘%1%’ has no environment binding named ‘%2%’")
@ -394,7 +395,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
PathSet paths = maybeUseOutputs(followLinksToStorePath(i), useOutput, forceRealise);
roots.insert(paths.begin(), paths.end());
}
printDotGraph(roots);
printDotGraph(*store, roots);
break;
}
@ -404,7 +405,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
PathSet paths = maybeUseOutputs(followLinksToStorePath(i), useOutput, forceRealise);
roots.insert(paths.begin(), paths.end());
}
printXmlGraph(roots);
printXmlGraph(*store, roots);
break;
}
@ -419,7 +420,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (auto & i : opArgs) {
PathSet paths = maybeUseOutputs(followLinksToStorePath(i), useOutput, forceRealise);
for (auto & j : paths)
computeFSClosure(*store, j, referrers, true,
store->computeFSClosure(j, referrers, true,
settings.gcKeepOutputs, settings.gcKeepDerivations);
}
Roots roots = store->findRoots();
@ -450,7 +451,7 @@ static void opPrintEnv(Strings opFlags, Strings opArgs)
if (opArgs.size() != 1) throw UsageError("‘--print-env’ requires one derivation store path");
Path drvPath = opArgs.front();
Derivation drv = derivationFromPath(*store, drvPath);
Derivation drv = store->derivationFromPath(drvPath);
/* Print each environment variable in the derivation in a format
that can be sourced by the shell. */
@ -715,9 +716,9 @@ static void opExport(Strings opFlags, Strings opArgs)
else throw UsageError(format("unknown flag ‘%1%’") % i);
FdSink sink(STDOUT_FILENO);
Paths sorted = topoSortPaths(*store, PathSet(opArgs.begin(), opArgs.end()));
Paths sorted = store->topoSortPaths(PathSet(opArgs.begin(), opArgs.end()));
reverse(sorted.begin(), sorted.end());
exportPaths(*store, sorted, sign, sink);
store->exportPaths(sorted, sign, sink);
}
@ -896,7 +897,7 @@ static void opServe(Strings opFlags, Strings opArgs)
if (!isDerivation(path)) paths2.insert(path);
unsigned long long downloadSize, narSize;
PathSet willBuild, willSubstitute, unknown;
queryMissing(*store, PathSet(paths2.begin(), paths2.end()),
store->queryMissing(PathSet(paths2.begin(), paths2.end()),
willBuild, willSubstitute, unknown, downloadSize, narSize);
/* FIXME: should use ensurePath(), but it only
does one path at a time. */
@ -941,9 +942,9 @@ static void opServe(Strings opFlags, Strings opArgs)
case cmdExportPaths: {
bool sign = readInt(in);
Paths sorted = topoSortPaths(*store, readStorePaths<PathSet>(in));
Paths sorted = store->topoSortPaths(readStorePaths<PathSet>(in));
reverse(sorted.begin(), sorted.end());
exportPaths(*store, sorted, sign, out);
store->exportPaths(sorted, sign, out);
break;
}
@ -988,7 +989,7 @@ static void opServe(Strings opFlags, Strings opArgs)
PathSet paths = readStorePaths<PathSet>(in);
PathSet closure;
for (auto & i : paths)
computeFSClosure(*store, i, closure, false, includeOutputs);
store->computeFSClosure(i, closure, false, includeOutputs);
out << closure;
break;
}