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#include "store-api.hh"
#include <sodium.h>
namespace nix {
static void checkName(std::string_view path, std::string_view name)
{
if (name.empty())
throw BadStorePath("store path '%s' has an empty name", path);
if (name.size() > StorePath::MaxPathLen)
throw BadStorePath("store path '%s' has a name longer than %d characters",
path, StorePath::MaxPathLen);
// See nameRegexStr for the definition
if (name[0] == '.') {
// check against "." and "..", followed by end or dash
if (name.size() == 1)
throw BadStorePath("store path '%s' has invalid name '%s'", path, name);
if (name[1] == '-')
throw BadStorePath("store path '%s' has invalid name '%s': first dash-separated component must not be '%s'", path, name, ".");
if (name[1] == '.') {
if (name.size() == 2)
throw BadStorePath("store path '%s' has invalid name '%s'", path, name);
if (name[2] == '-')
throw BadStorePath("store path '%s' has invalid name '%s': first dash-separated component must not be '%s'", path, name, "..");
}
}
for (auto c : name)
if (!((c >= '0' && c <= '9')
|| (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| c == '+' || c == '-' || c == '.' || c == '_' || c == '?' || c == '='))
throw BadStorePath("store path '%s' contains illegal character '%s'", path, c);
}
StorePath::StorePath(std::string_view _baseName)
: baseName(_baseName)
{
if (baseName.size() < HashLen + 1)
throw BadStorePath("'%s' is too short to be a valid store path", baseName);
for (auto c : hashPart())
if (c == 'e' || c == 'o' || c == 'u' || c == 't'
|| !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z')))
throw BadStorePath("store path '%s' contains illegal base-32 character '%s'", baseName, c);
checkName(baseName, name());
}
StorePath::StorePath(const Hash & hash, std::string_view _name)
: baseName((hash.to_string(Base::Base32, false) + "-").append(std::string(_name)))
{
checkName(baseName, name());
}
bool StorePath::isDerivation() const
{
return name().ends_with(drvExtension);
}
StorePath StorePath::dummy("ffffffffffffffffffffffffffffffff-x");
StorePath StorePath::random(std::string_view name)
{
Hash hash(HashType::SHA1);
randombytes_buf(hash.hash, hash.hashSize);
return StorePath(hash, name);
}
StorePath Store::parseStorePath(std::string_view path) const
{
auto p = canonPath(std::string(path));
if (dirOf(p) != storeDir)
throw BadStorePath("path '%s' is not in the Nix store", p);
return StorePath(baseNameOf(p));
}
std::optional<StorePath> Store::maybeParseStorePath(std::string_view path) const
{
// If it's not an absolute path, or if the dirname of the path isn't /nix/store
// (or whatever our storeDir is), then it can't be a store path.
if ((path.size() > 0 && path[0] != '/') || dirOf(canonPath(path)) != this->storeDir) {
return std::nullopt;
}
try {
return parseStorePath(path);
} catch (Error &) {
return {};
}
}
bool Store::isStorePath(std::string_view path) const
{
return (bool) maybeParseStorePath(path);
}
StorePathSet Store::parseStorePathSet(const PathSet & paths) const
{
StorePathSet res;
for (auto & i : paths) res.insert(parseStorePath(i));
return res;
}
std::string Store::printStorePath(const StorePath & path) const
{
return (storeDir + "/").append(path.to_string());
}
PathSet Store::printStorePathSet(const StorePathSet & paths) const
{
PathSet res;
for (auto & i : paths) res.insert(printStorePath(i));
return res;
}
}
std::size_t std::hash<nix::StorePath>::operator()(const nix::StorePath & path) const noexcept
{
// It's already a cryptographic hash of 160 bits (assuming that nobody gives us bogus ones...), so just parse it.
auto h = nix::Hash::parseNonSRIUnprefixed(path.hashPart(), nix::HashType::SHA1);
// This need not be stable across machines, so bit casting the start of it is fine.
size_t r;
memcpy(&r, h.hash, sizeof(r));
return r;
}
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