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* Topologically sort paths under the references relation to ensure

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that they are deleted in an order that maintains the closure
  invariant.
* Presence of a path in a temporary roots file does not imply that all
  paths in its closure are also present, so add the closure.
This commit is contained in:
Eelco Dolstra 2005-01-31 14:00:43 +00:00
parent 33c5d23b81
commit 252c9c91ab
3 changed files with 83 additions and 38 deletions
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10
src/libstore/store.cc
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@ -311,10 +311,9 @@ void queryReferences(const Path & storePath, PathSet & references)
void queryReferers(const Path & storePath, PathSet & referers)
{
Paths referers2;
if (!isRealisablePath(noTxn, storePath))
throw Error(format("path `%1%' is not valid") % storePath);
nixDB.queryStrings(noTxn, dbReferers, storePath, referers2);
PathSet referers2 = getReferers(noTxn, storePath);
referers.insert(referers2.begin(), referers2.end());
}
@ -427,6 +426,8 @@ void registerValidPath(const Transaction & txn,
}
/* Invalidate a path. The caller is responsible for checking that
there are no referers. */
static void invalidatePath(const Path & path, Transaction & txn)
{
debug(format("unregistering path `%1%'") % path);
@ -551,8 +552,11 @@ void deleteFromStore(const Path & _path)
assertStorePath(path);
Transaction txn(nixDB);
if (isValidPathTxn(txn, path))
if (isValidPathTxn(txn, path)) {
if (getReferers(txn, path).size() > 0)
throw Error(format("cannot delete path `%1%' because it is in use") % path);
invalidatePath(path, txn);
}
txn.commit();
deletePath(path);