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* findRoots: return a map from the symlink (outside of the store) to 

the store path (inside the store).
This commit is contained in:
Eelco Dolstra 2006-12-05 00:48:36 +00:00
parent d27a73b1a9
commit 8623256f48
1 changed files with 16 additions and 11 deletions
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27
src/libstore/gc.cc
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@ -91,7 +91,10 @@ void LocalStore::addIndirectRoot(const Path & path)
} }
static void findRoots(PathSet & roots, bool ignoreUnreadable); typedef std::map<Path, Path> Roots;
static void findRoots(Roots & roots, bool ignoreUnreadable);
Path addPermRoot(const Path & _storePath, const Path & _gcRoot, Path addPermRoot(const Path & _storePath, const Path & _gcRoot,
@ -120,16 +123,14 @@ Path addPermRoot(const Path & _storePath, const Path & _gcRoot,
createSymlink(gcRoot, storePath, false); createSymlink(gcRoot, storePath, false);
/* Check that the root can be found by the garbage collector. */ /* Check that the root can be found by the garbage collector. */
PathSet roots; Roots roots;
findRoots(roots, true); findRoots(roots, true);
if (roots.find(storePath) == roots.end()) { if (roots.find(gcRoot) == roots.end())
static bool haveWarned = false; printMsg(lvlError,
warnOnce(haveWarned,
format( format(
"the path `%1%' is not reachable from the roots directory of the garbage collector; " "warning: the garbage collector does not find `%1%' as a root; "
"therefore, `%2%' might be removed by the garbage collector") "therefore, `%2%' might be removed by the garbage collector")
% gcRoot % storePath); % gcRoot % storePath);
}
} }
/* Grab the global GC root, causing us to block while a GC is in /* Grab the global GC root, causing us to block while a GC is in
@ -307,7 +308,7 @@ static void readTempRoots(PathSet & tempRoots, FDs & fds)
static void findRoots(const Path & path, bool recurseSymlinks, static void findRoots(const Path & path, bool recurseSymlinks,
bool ignoreUnreadable, PathSet & roots) bool ignoreUnreadable, Roots & roots)
{ {
struct stat st; struct stat st;
if (lstat(path.c_str(), &st) == -1) if (lstat(path.c_str(), &st) == -1)
@ -329,7 +330,7 @@ static void findRoots(const Path & path, bool recurseSymlinks,
% target % path); % target % path);
Path storePath = toStorePath(target); Path storePath = toStorePath(target);
if (store->isValidPath(storePath)) if (store->isValidPath(storePath))
roots.insert(storePath); roots[path] = storePath;
else else
printMsg(lvlInfo, format("skipping invalid root from `%1%' to `%2%'") printMsg(lvlInfo, format("skipping invalid root from `%1%' to `%2%'")
% path % storePath); % path % storePath);
@ -355,7 +356,7 @@ static void findRoots(const Path & path, bool recurseSymlinks,
} }
static void findRoots(PathSet & roots, bool ignoreUnreadable) static void findRoots(Roots & roots, bool ignoreUnreadable)
{ {
Path rootsDir = canonPath((format("%1%/%2%") % nixStateDir % gcRootsDir).str()); Path rootsDir = canonPath((format("%1%/%2%") % nixStateDir % gcRootsDir).str());
findRoots(rootsDir, true, ignoreUnreadable, roots); findRoots(rootsDir, true, ignoreUnreadable, roots);
@ -436,8 +437,12 @@ void collectGarbage(GCAction action, const PathSet & pathsToDelete,
/* Find the roots. Since we've grabbed the GC lock, the set of /* Find the roots. Since we've grabbed the GC lock, the set of
permanent roots cannot increase now. */ permanent roots cannot increase now. */
Roots rootMap;
findRoots(rootMap, false);
PathSet roots; PathSet roots;
findRoots(roots, false); for (Roots::iterator i = rootMap.begin(); i != rootMap.end(); ++i)
roots.insert(i->second);
/* Add additional roots returned by the program specified by the /* Add additional roots returned by the program specified by the
NIX_ROOT_FINDER environment variable. This is typically used NIX_ROOT_FINDER environment variable. This is typically used