forked from lix-project/lix
863dcff6c5
representation of closures as ATerms in the Nix store. Instead, the
file system pointer graph is now stored in the Nix database. This
has many advantages:
- It greatly simplifies the implementation (we can drop the notion
of `successors', and so on).
- It makes registering roots for the garbage collector much easier.
Instead of specifying the closure expression as a root, you can
simply specify the store path that must be retained as a root.
This could not be done previously, since there was no way to find
the closure store expression containing a given store path.
- Better traceability: it is now possible to query what paths are
referenced by a path, and what paths refer to a path.
138 lines
3 KiB
C++
138 lines
3 KiB
C++
#include "dotgraph.hh"
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#include "normalise.hh"
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#if 0
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static string dotQuote(const string & s)
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{
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return "\"" + s + "\"";
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}
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static string nextColour()
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{
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static int n = 0;
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static string colours[] =
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{ "black", "red", "green", "blue"
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, "magenta", "burlywood" };
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return colours[n++ % (sizeof(colours) / sizeof(string))];
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}
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static string makeEdge(const string & src, const string & dst)
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{
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format f = format("%1% -> %2% [color = %3%];\n")
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% dotQuote(src) % dotQuote(dst) % dotQuote(nextColour());
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return f.str();
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}
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static string makeNode(const string & id, const string & label,
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const string & colour)
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{
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format f = format("%1% [label = %2%, shape = box, "
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"style = filled, fillcolor = %3%];\n")
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% dotQuote(id) % dotQuote(label) % dotQuote(colour);
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return f.str();
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}
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static string symbolicName(const string & path)
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{
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string p = baseNameOf(path);
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if (isHash(string(p, 0, md5HashSize * 2)) &&
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p[md5HashSize * 2] == '-')
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p = string(p, md5HashSize * 2 + 1);
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return p;
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}
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string pathLabel(const Path & nePath, const string & elemPath)
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{
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return (string) nePath + "-" + elemPath;
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}
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void printClosure(const Path & nePath, const StoreExpr & fs)
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{
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PathSet workList(fs.closure.roots);
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PathSet doneSet;
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for (PathSet::iterator i = workList.begin(); i != workList.end(); i++) {
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cout << makeEdge(pathLabel(nePath, *i), nePath);
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}
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while (!workList.empty()) {
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Path path = *(workList.begin());
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workList.erase(path);
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if (doneSet.find(path) == doneSet.end()) {
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doneSet.insert(path);
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ClosureElems::const_iterator elem = fs.closure.elems.find(path);
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if (elem == fs.closure.elems.end())
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throw Error(format("bad closure, missing path `%1%'") % path);
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for (StringSet::const_iterator i = elem->second.refs.begin();
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i != elem->second.refs.end(); i++)
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{
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workList.insert(*i);
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cout << makeEdge(pathLabel(nePath, *i), pathLabel(nePath, path));
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}
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cout << makeNode(pathLabel(nePath, path),
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symbolicName(path), "#ff0000");
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}
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}
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}
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void printDotGraph(const PathSet & roots)
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{
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PathSet workList(roots);
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PathSet doneSet;
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cout << "digraph G {\n";
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while (!workList.empty()) {
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Path nePath = *(workList.begin());
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workList.erase(nePath);
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if (doneSet.find(nePath) == doneSet.end()) {
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doneSet.insert(nePath);
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StoreExpr ne = storeExprFromPath(nePath);
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string label, colour;
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if (ne.type == StoreExpr::neDerivation) {
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for (PathSet::iterator i = ne.derivation.inputs.begin();
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i != ne.derivation.inputs.end(); i++)
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{
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workList.insert(*i);
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cout << makeEdge(*i, nePath);
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}
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label = "derivation";
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colour = "#00ff00";
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for (StringPairs::iterator i = ne.derivation.env.begin();
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i != ne.derivation.env.end(); i++)
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if (i->first == "name") label = i->second;
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}
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else if (ne.type == StoreExpr::neClosure) {
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label = "<closure>";
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colour = "#00ffff";
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printClosure(nePath, ne);
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}
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else abort();
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cout << makeNode(nePath, label, colour);
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}
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}
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cout << "}\n";
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}
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#endif
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