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* `nix-store -qR' and friends: print the paths sorted topologically 

under the references relation.  This is useful for commands that
  want to copy paths to another Nix store in the right order.
This commit is contained in:
Eelco Dolstra 2007-02-21 22:45:10 +00:00
parent 881feb9698
commit 9da367b7d5
3 changed files with 12 additions and 40 deletions
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4
src/libstore/gc.cc
View File

@ -417,7 +417,7 @@ static void dfsVisit(const PathSet & paths, const Path & path,
}
static Paths topoSort(const PathSet & paths)
Paths topoSortPaths(const PathSet & paths)
{
Paths sorted;
PathSet visited;
@ -550,7 +550,7 @@ void LocalStore::collectGarbage(GCAction action, const PathSet & pathsToDelete,
which things can be deleted safely. */
/* !!! when we have multiple output paths per derivation, this
will not work anymore because we get cycles. */
Paths storePaths = topoSort(storePathSet);
Paths storePaths = topoSortPaths(storePathSet);
/* Try to delete store paths in the topologically sorted order. */
for (Paths::iterator i = storePaths.begin(); i != storePaths.end(); ++i) {

5
src/libstore/store-api.hh
View File

@ -242,6 +242,11 @@ Path addPermRoot(const Path & storePath, const Path & gcRoot,
bool indirect, bool allowOutsideRootsDir = false);
/* Sort a set of paths topologically under the references relation.
If p refers to q, then p follows q in this list. */
Paths topoSortPaths(const PathSet & paths);
/* For now, there is a single global store API object, but we'll
purify that in the future. */
extern boost::shared_ptr<StoreAPI> store;

43
src/nix-store/nix-store.cc
View File

@ -210,14 +210,6 @@ static Path maybeUseOutput(const Path & storePath, bool useOutput, bool forceRea
}
static void printPathSet(const PathSet & paths)
{
for (PathSet::iterator i = paths.begin();
i != paths.end(); ++i)
cout << format("%s\n") % *i;
}
/* Some code to print a tree representation of a derivation dependency
graph. Topological sorting is used to keep the tree relatively
flat. */
@ -227,34 +219,6 @@ const string treeLine = "| ";
const string treeNull = " ";
static void dfsVisit(const PathSet & paths, const Path & path,
PathSet & visited, Paths & sorted)
{
if (visited.find(path) != visited.end()) return;
visited.insert(path);
PathSet closure;
computeFSClosure(path, closure);
for (PathSet::iterator i = closure.begin();
i != closure.end(); ++i)
if (*i != path && paths.find(*i) != paths.end())
dfsVisit(paths, *i, visited, sorted);
sorted.push_front(path);
}
static Paths topoSort(const PathSet & paths)
{
Paths sorted;
PathSet visited;
for (PathSet::const_iterator i = paths.begin(); i != paths.end(); ++i)
dfsVisit(paths, *i, visited, sorted);
return sorted;
}
static void printTree(const Path & path,
const string & firstPad, const string & tailPad, PathSet & done)
{
@ -279,7 +243,7 @@ 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 = topoSort(references);
Paths sorted = topoSortPaths(references);
reverse(sorted.begin(), sorted.end());
for (Paths::iterator i = sorted.begin(); i != sorted.end(); ++i) {
@ -355,7 +319,10 @@ static void opQuery(Strings opFlags, Strings opArgs)
else if (query == qReferrers) store->queryReferrers(path, paths);
else if (query == qReferrersClosure) computeFSClosure(path, paths, true);
}
printPathSet(paths);
Paths sorted = topoSortPaths(paths);
for (Paths::reverse_iterator i = sorted.rbegin();
i != sorted.rend(); ++i)
cout << format("%s\n") % *i;
break;
}