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nix-store -q --roots: Respect the gc-keep-outputs/gc-keep-derivations settings

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So if a path is not garbage solely because it's reachable from a root
due to the gc-keep-outputs or gc-keep-derivations settings, ‘nix-store
-q --roots’ now shows that root.
This commit is contained in:
Eelco Dolstra 2012-12-20 18:41:44 +01:00
parent 06f62defe6
commit 2754a07ead
9 changed files with 63 additions and 24 deletions
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52
src/libstore/misc.cc
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@ -15,27 +15,47 @@ Derivation derivationFromPath(StoreAPI & store, const Path & drvPath)
}
void computeFSClosure(StoreAPI & store, const Path & storePath,
PathSet & paths, bool flipDirection, bool includeOutputs)
void computeFSClosure(StoreAPI & store, const Path & path,
PathSet & paths, bool flipDirection, bool includeOutputs, bool includeDerivers)
{
if (paths.find(storePath) != paths.end()) return;
paths.insert(storePath);
if (paths.find(path) != paths.end()) return;
paths.insert(path);
PathSet references;
if (flipDirection)
store.queryReferrers(storePath, references);
else
store.queryReferences(storePath, references);
PathSet edges;
if (includeOutputs && isDerivation(storePath)) {
PathSet outputs = store.queryDerivationOutputs(storePath);
foreach (PathSet::iterator, i, outputs)
if (store.isValidPath(*i))
computeFSClosure(store, *i, paths, flipDirection, true);
if (flipDirection) {
store.queryReferrers(path, edges);
if (includeOutputs) {
PathSet derivers = store.queryValidDerivers(path);
foreach (PathSet::iterator, i, derivers)
edges.insert(*i);
}
if (includeDerivers && isDerivation(path)) {
PathSet outputs = store.queryDerivationOutputs(path);
foreach (PathSet::iterator, i, outputs)
if (store.isValidPath(*i) && store.queryDeriver(*i) == path)
edges.insert(*i);
}
} else {
store.queryReferences(path, edges);
if (includeOutputs && isDerivation(path)) {
PathSet outputs = store.queryDerivationOutputs(path);
foreach (PathSet::iterator, i, outputs)
if (store.isValidPath(*i)) edges.insert(*i);
}
if (includeDerivers) {
Path deriver = store.queryDeriver(path);
if (store.isValidPath(deriver)) edges.insert(deriver);
}
}
foreach (PathSet::iterator, i, references)
computeFSClosure(store, *i, paths, flipDirection, includeOutputs);
foreach (PathSet::iterator, i, edges)
computeFSClosure(store, *i, paths, flipDirection, includeOutputs, includeDerivers);
}