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* Don't consider a store path valid if its info file exists but is

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zero bytes long.  That makes Nix more robust in case of crashes
  (especially on ext4).
This commit is contained in:
Eelco Dolstra 2010-01-29 11:53:58 +00:00
parent fdcaf37361
commit ad529fb89f
1 changed files with 36 additions and 4 deletions
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40
src/libstore/local-store.cc
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@ -390,6 +390,9 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path, bool ignoreErrors)
assertStorePath(path);
if (!isValidPath(path))
throw Error(format("path `%1%' is not valid") % path);
std::map<Path, ValidPathInfo>::iterator lookup = pathInfoCache.find(path);
if (lookup != pathInfoCache.end()) return lookup->second;
@ -404,7 +407,11 @@ ValidPathInfo LocalStore::queryPathInfo(const Path & path, bool ignoreErrors)
foreach (Strings::iterator, i, lines) {
string::size_type p = i->find(':');
if (p == string::npos) continue; /* bad line */
if (p == string::npos) {
if (!ignoreErrors)
throw Error(format("corrupt line in `%1%': %2%") % infoFile % *i);
continue; /* bad line */
}
string name(*i, 0, p);
string value(*i, p + 2);
if (name == "References") {
@ -435,7 +442,22 @@ bool LocalStore::isValidPath(const Path & path)
/* Files in the info directory starting with a `.' are temporary
files. */
if (baseNameOf(path).at(0) == '.') return false;
return pathExists(infoFileFor(path));
/* A path is valid if its info file exists and has a non-zero
size. (The non-zero size restriction is to be robust to
certain kinds of filesystem corruption, particularly with
ext4.) */
Path infoFile = infoFileFor(path);
struct stat st;
if (lstat(infoFile.c_str(), &st)) {
if (errno == ENOENT) return false;
throw SysError(format("getting status of `%1%'") % infoFile);
}
if (st.st_size == 0) return false;
return true;
}
@ -1028,8 +1050,18 @@ void LocalStore::verifyStore(bool checkContents)
} else if (!pathExists(*i)) {
printMsg(lvlError, format("path `%1%' disappeared") % *i);
invalidatePath(*i);
} else
validPaths.insert(*i);
} else {
Path infoFile = infoFileFor(*i);
struct stat st;
if (lstat(infoFile.c_str(), &st))
throw SysError(format("getting status of `%1%'") % infoFile);
if (st.st_size == 0) {
printMsg(lvlError, format("removing corrupt info file `%1%'") % infoFile);
if (unlink(infoFile.c_str()) == -1)
throw SysError(format("unlinking `%1%'") % infoFile);
}
else validPaths.insert(*i);
}
}