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#include "crypto.hh"
#include "globals.hh"
#include "nar-info.hh"
namespace nix {
NarInfo::NarInfo(const std::string & s, const std::string & whence)
{
auto corrupt = [&]() {
throw Error("NAR info file ‘%1%’ is corrupt");
};
auto parseHashField = [&](const string & s) {
string::size_type colon = s.find(':');
if (colon == string::npos) corrupt();
HashType ht = parseHashType(string(s, 0, colon));
if (ht == htUnknown) corrupt();
return parseHash16or32(ht, string(s, colon + 1));
};
size_t pos = 0;
while (pos < s.size()) {
size_t colon = s.find(':', pos);
if (colon == std::string::npos) corrupt();
std::string name(s, pos, colon - pos);
size_t eol = s.find('\n', colon + 2);
if (eol == std::string::npos) corrupt();
std::string value(s, colon + 2, eol - colon - 2);
if (name == "StorePath") {
if (!isStorePath(value)) corrupt();
path = value;
}
else if (name == "URL")
url = value;
else if (name == "Compression")
compression = value;
else if (name == "FileHash")
fileHash = parseHashField(value);
else if (name == "FileSize") {
if (!string2Int(value, fileSize)) corrupt();
}
else if (name == "NarHash")
narHash = parseHashField(value);
else if (name == "NarSize") {
if (!string2Int(value, narSize)) corrupt();
}
else if (name == "References") {
auto refs = tokenizeString<Strings>(value, " ");
if (!references.empty()) corrupt();
for (auto & r : refs) {
auto r2 = settings.nixStore + "/" + r;
if (!isStorePath(r2)) corrupt();
references.insert(r2);
}
}
else if (name == "Deriver") {
auto p = settings.nixStore + "/" + value;
if (!isStorePath(p)) corrupt();
deriver = p;
}
else if (name == "System")
system = value;
else if (name == "Sig")
sigs.insert(value);
pos = eol + 1;
}
if (compression == "") compression = "bzip2";
if (path.empty() || url.empty()) corrupt();
}
std::string NarInfo::to_string() const
{
std::string res;
res += "StorePath: " + path + "\n";
res += "URL: " + url + "\n";
assert(compression != "");
res += "Compression: " + compression + "\n";
assert(fileHash.type == htSHA256);
res += "FileHash: sha256:" + printHash32(fileHash) + "\n";
res += "FileSize: " + std::to_string(fileSize) + "\n";
assert(narHash.type == htSHA256);
res += "NarHash: sha256:" + printHash32(narHash) + "\n";
res += "NarSize: " + std::to_string(narSize) + "\n";
res += "References: " + concatStringsSep(" ", shortRefs()) + "\n";
if (!deriver.empty())
res += "Deriver: " + baseNameOf(deriver) + "\n";
if (!system.empty())
res += "System: " + system + "\n";
for (auto sig : sigs)
res += "Sig: " + sig + "\n";
return res;
}
std::string NarInfo::fingerprint() const
{
return
"1;" + path + ";"
+ printHashType(narHash.type) + ":" + printHash32(narHash) + ";"
+ std::to_string(narSize) + ";"
+ concatStringsSep(",", references);
}
Strings NarInfo::shortRefs() const
{
Strings refs;
for (auto & r : references)
refs.push_back(baseNameOf(r));
return refs;
}
void NarInfo::sign(const SecretKey & secretKey)
{
sigs.insert(secretKey.signDetached(fingerprint()));
}
unsigned int NarInfo::checkSignatures(const PublicKeys & publicKeys) const
{
unsigned int good = 0;
for (auto & sig : sigs)
if (verifyDetached(fingerprint(), sig, publicKeys))
good++;
return good;
}
}
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