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* `nix-store --verify': revive checking the referrers table. This is

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important to get garbage collection to work if there is any
  inconsistency in the database (because the referrer table is used to
  determine whether it is safe to delete a path).
* `nix-store --verify': show some progress.
This commit is contained in:
Eelco Dolstra 2007-01-14 17:28:30 +00:00
parent 8f67b35886
commit 63f3ce6d9a
1 changed files with 60 additions and 46 deletions
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102
src/libstore/local-store.cc
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@ -722,6 +722,9 @@ void verifyStore(bool checkContents)
{ {
Transaction txn(nixDB); Transaction txn(nixDB);
printMsg(lvlInfo, "checking path existence");
Paths paths; Paths paths;
PathSet validPaths; PathSet validPaths;
nixDB.enumTable(txn, dbValidPaths, paths); nixDB.enumTable(txn, dbValidPaths, paths);
@ -748,9 +751,12 @@ void verifyStore(bool checkContents)
} }
} }
/* "Usable" paths are those that are valid or have a
printMsg(lvlInfo, "checking path realisability");
/* "Realisable" paths are those that are valid or have a
substitute. */ substitute. */
PathSet usablePaths(validPaths); PathSet realisablePaths(validPaths);
/* Check that the values of the substitute mappings are valid /* Check that the values of the substitute mappings are valid
paths. */ paths. */
@ -759,47 +765,52 @@ void verifyStore(bool checkContents)
for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) { for (Paths::iterator i = subKeys.begin(); i != subKeys.end(); ++i) {
Substitutes subs = readSubstitutes(txn, *i); Substitutes subs = readSubstitutes(txn, *i);
if (!isStorePath(*i)) { if (!isStorePath(*i)) {
printMsg(lvlError, format("found substitutes for non-store path `%1%'") % *i); printMsg(lvlError, format("removing substitutes for non-store path `%1%'") % *i);
nixDB.delPair(txn, dbSubstitutes, *i); nixDB.delPair(txn, dbSubstitutes, *i);
} }
else if (subs.size() == 0) else if (subs.size() == 0)
nixDB.delPair(txn, dbSubstitutes, *i); nixDB.delPair(txn, dbSubstitutes, *i);
else else
usablePaths.insert(*i); realisablePaths.insert(*i);
} }
/* Check the cleanup invariant: only usable paths can have
/* Check the cleanup invariant: only realisable paths can have
`references', `referrers', or `derivers' entries. */ `references', `referrers', or `derivers' entries. */
/* Check the `derivers' table. */ /* Check the `derivers' table. */
printMsg(lvlInfo, "checking the derivers table");
Paths deriversKeys; Paths deriversKeys;
nixDB.enumTable(txn, dbDerivers, deriversKeys); nixDB.enumTable(txn, dbDerivers, deriversKeys);
for (Paths::iterator i = deriversKeys.begin(); for (Paths::iterator i = deriversKeys.begin();
i != deriversKeys.end(); ++i) i != deriversKeys.end(); ++i)
{ {
if (usablePaths.find(*i) == usablePaths.end()) { if (realisablePaths.find(*i) == realisablePaths.end()) {
printMsg(lvlError, format("found deriver entry for unusable path `%1%'") printMsg(lvlError, format("removing deriver entry for unrealisable path `%1%'")
% *i); % *i);
nixDB.delPair(txn, dbDerivers, *i); nixDB.delPair(txn, dbDerivers, *i);
} }
else { else {
Path deriver = queryDeriver(txn, *i); Path deriver = queryDeriver(txn, *i);
if (!isStorePath(deriver)) { if (!isStorePath(deriver)) {
printMsg(lvlError, format("found corrupt deriver `%1%' for `%2%'") printMsg(lvlError, format("removing corrupt deriver `%1%' for `%2%'")
% deriver % *i); % deriver % *i);
nixDB.delPair(txn, dbDerivers, *i); nixDB.delPair(txn, dbDerivers, *i);
} }
} }
} }
/* Check the `references' table. */ /* Check the `references' table. */
printMsg(lvlInfo, "checking the references table");
Paths referencesKeys; Paths referencesKeys;
nixDB.enumTable(txn, dbReferences, referencesKeys); nixDB.enumTable(txn, dbReferences, referencesKeys);
for (Paths::iterator i = referencesKeys.begin(); for (Paths::iterator i = referencesKeys.begin();
i != referencesKeys.end(); ++i) i != referencesKeys.end(); ++i)
{ {
if (usablePaths.find(*i) == usablePaths.end()) { if (realisablePaths.find(*i) == realisablePaths.end()) {
printMsg(lvlError, format("found references entry for unusable path `%1%'") printMsg(lvlError, format("removing references entry for unrealisable path `%1%'")
% *i); % *i);
setReferences(txn, *i, PathSet()); setReferences(txn, *i, PathSet());
} }
@ -812,7 +823,7 @@ void verifyStore(bool checkContents)
{ {
string dummy; string dummy;
if (!nixDB.queryString(txn, dbReferrers, addPrefix(*j, *i), dummy)) { if (!nixDB.queryString(txn, dbReferrers, addPrefix(*j, *i), dummy)) {
printMsg(lvlError, format("missing referrer mapping from `%1%' to `%2%'") printMsg(lvlError, format("adding missing referrer mapping from `%1%' to `%2%'")
% *j % *i); % *j % *i);
nixDB.setString(txn, dbReferrers, addPrefix(*j, *i), ""); nixDB.setString(txn, dbReferrers, addPrefix(*j, *i), "");
} }
@ -824,44 +835,47 @@ void verifyStore(bool checkContents)
} }
} }
#if 0 // !!!
/* Check the `referrers' table. */ /* Check the `referrers' table. */
Paths referrersKeys; printMsg(lvlInfo, "checking the referrers table");
nixDB.enumTable(txn, dbReferrers, referrersKeys); Strings referrers;
for (Paths::iterator i = referrersKeys.begin(); nixDB.enumTable(txn, dbReferrers, referrers);
i != referrersKeys.end(); ++i) for (Strings::iterator i = referrers.begin(); i != referrers.end(); ++i) {
{
if (usablePaths.find(*i) == usablePaths.end()) { /* Decode the entry (it's a tuple of paths). */
printMsg(lvlError, format("found referrers entry for unusable path `%1%'") string::size_type nul = i->find((char) 0);
% *i); if (nul == string::npos) {
printMsg(lvlError, format("removing bad referrer table entry `%1%'") % *i);
nixDB.delPair(txn, dbReferrers, *i);
continue;
}
Path to(*i, 0, nul);
Path from(*i, nul + 1);
if (realisablePaths.find(to) == realisablePaths.end()) {
printMsg(lvlError, format("removing referrer entry from `%1%' to unrealisable `%2%'")
% from % to);
nixDB.delPair(txn, dbReferrers, *i); nixDB.delPair(txn, dbReferrers, *i);
} }
else {
PathSet referrers, newReferrers; else if (realisablePaths.find(from) == realisablePaths.end()) {
queryReferrers(txn, *i, referrers); printMsg(lvlError, format("removing referrer entry from unrealisable `%1%' to `%2%'")
for (PathSet::iterator j = referrers.begin(); % from % to);
j != referrers.end(); ++j) nixDB.delPair(txn, dbReferrers, *i);
{
Paths references;
if (usablePaths.find(*j) == usablePaths.end()) {
printMsg(lvlError, format("referrer mapping from `%1%' to unusable `%2%'")
% *i % *j);
} else {
nixDB.queryStrings(txn, dbReferences, *j, references);
if (find(references.begin(), references.end(), *i) == references.end()) {
printMsg(lvlError, format("missing reference mapping from `%1%' to `%2%'")
% *j % *i);
/* !!! repair by inserting *i into references */
}
else newReferrers.insert(*j);
}
}
if (referrers != newReferrers)
nixDB.setStrings(txn, dbReferrers, *i,
Paths(newReferrers.begin(), newReferrers.end()));
} }
else {
PathSet references;
queryReferences(txn, from, references);
if (find(references.begin(), references.end(), to) == references.end()) {
printMsg(lvlError, format("adding missing referrer mapping from `%1%' to `%2%'")
% from % to);
references.insert(to);
setReferences(txn, from, references);
}
}
} }
#endif
txn.commit(); txn.commit();
} }