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* An operation `nix-store --clear-substitutes' to remove all

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registered substitute mappings.
This commit is contained in:
Eelco Dolstra 2004-12-20 14:16:55 +00:00
parent fa9259f5f5
commit 8b9697e575
1 changed files with 35 additions and 8 deletions
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43
src/libstore/store.cc
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@ -355,9 +355,41 @@ Substitutes querySubstitutes(const Path & srcPath)
}
static void unregisterPredecessors(const Path & path, Transaction & txn)
{
/* Remove any successor mappings to this path (but not *from*
it). */
Paths revs;
nixDB.queryStrings(txn, dbSuccessorsRev, path, revs);
for (Paths::iterator i = revs.begin(); i != revs.end(); ++i)
nixDB.delPair(txn, dbSuccessors, *i);
nixDB.delPair(txn, dbSuccessorsRev, path);
}
void clearSubstitutes()
{
Transaction txn(nixDB);
/* Iterate over all paths for which there are substitutes. */
Paths subKeys;
nixDB.enumTable(txn, dbSubstitutes, subKeys);
for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) {
/* If this path has not become valid in the mean-while, delete
any successor mappings *to* it. This is to preserve the
invariant the all successors are `usable' as opposed to
`valid' (i.e., the successor must be valid *or* have at
least one substitute). */
if (!isValidPath(*i)) {
unregisterPredecessors(*i, txn);
}
/* Delete all substitutes for path *i. */
nixDB.delPair(txn, dbSubstitutes, *i);
}
txn.commit();
}
@ -375,14 +407,7 @@ static void invalidatePath(const Path & path, Transaction & txn)
debug(format("unregistering path `%1%'") % path);
nixDB.delPair(txn, dbValidPaths, path);
/* Remove any successor mappings to this path (but not *from*
it). */
Paths revs;
nixDB.queryStrings(txn, dbSuccessorsRev, path, revs);
for (Paths::iterator i = revs.begin(); i != revs.end(); ++i)
nixDB.delPair(txn, dbSuccessors, *i);
nixDB.delPair(txn, dbSuccessorsRev, path);
unregisterPredecessors(path, txn);
}
@ -511,6 +536,8 @@ void verifyStore()
Substitutes subs = readSubstitutes(txn, *i);
if (subs.size() > 0)
usablePaths.insert(*i);
else
nixDB.delPair(txn, dbSubstitutes, *i);
}
/* Check that the values of the successor mappings are usable