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#include "primops.hh"
#include "eval-inline.hh"
#include "store-api.hh"
#include "fetchers/fetchers.hh"
#include "fetchers/registry.hh"
#include "download.hh"
#include <ctime>
#include <iomanip>
namespace nix {
void emitTreeAttrs(
EvalState & state,
const fetchers::Tree & tree,
std::shared_ptr<const fetchers::Input> input,
Value & v)
{
state.mkAttrs(v, 8);
auto storePath = state.store->printStorePath(tree.storePath);
mkString(*state.allocAttr(v, state.sOutPath), storePath, PathSet({storePath}));
assert(tree.info.narHash);
mkString(*state.allocAttr(v, state.symbols.create("narHash")),
tree.info.narHash.to_string(SRI));
if (input->getRev()) {
mkString(*state.allocAttr(v, state.symbols.create("rev")), input->getRev()->gitRev());
mkString(*state.allocAttr(v, state.symbols.create("shortRev")), input->getRev()->gitShortRev());
}
if (tree.info.revCount)
mkInt(*state.allocAttr(v, state.symbols.create("revCount")), *tree.info.revCount);
if (tree.info.lastModified)
mkString(*state.allocAttr(v, state.symbols.create("lastModified")),
fmt("%s", std::put_time(std::gmtime(&*tree.info.lastModified), "%Y%m%d%H%M%S")));
v.attrs->sort();
}
static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
settings.requireExperimentalFeature("flakes");
std::shared_ptr<const fetchers::Input> input;
PathSet context;
state.forceValue(*args[0]);
if (args[0]->type == tAttrs) {
state.forceAttrs(*args[0], pos);
fetchers::Attrs attrs;
for (auto & attr : *args[0]->attrs) {
state.forceValue(*attr.value);
if (attr.value->type == tString)
attrs.emplace(attr.name, attr.value->string.s);
else if (attr.value->type == tBool)
attrs.emplace(attr.name, attr.value->boolean);
else
throw TypeError("fetchTree argument '%s' is %s while a string or Boolean is expected",
attr.name, showType(*attr.value));
}
if (!attrs.count("type"))
throw Error("attribute 'type' is missing in call to 'fetchTree', at %s", pos);
input = fetchers::inputFromAttrs(attrs);
} else
input = fetchers::inputFromURL(state.coerceToString(pos, *args[0], context, false, false));
if (!evalSettings.pureEval && !input->isDirect())
input = lookupInRegistries(state.store, input).first;
if (evalSettings.pureEval && !input->isImmutable())
throw Error("in pure evaluation mode, 'fetchTree' requires an immutable input");
// FIXME: use fetchOrSubstituteTree
auto [tree, input2] = input->fetchTree(state.store);
if (state.allowedPaths)
state.allowedPaths->insert(tree.actualPath);
emitTreeAttrs(state, tree, input2, v);
}
static RegisterPrimOp r("fetchTree", 1, prim_fetchTree);
static void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
const string & who, bool unpack, std::string name)
{
std::optional<std::string> url;
std::optional<Hash> expectedHash;
state.forceValue(*args[0]);
if (args[0]->type == tAttrs) {
state.forceAttrs(*args[0], pos);
for (auto & attr : *args[0]->attrs) {
string n(attr.name);
if (n == "url")
url = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (n == "sha256")
expectedHash = Hash(state.forceStringNoCtx(*attr.value, *attr.pos), htSHA256);
else if (n == "name")
name = state.forceStringNoCtx(*attr.value, *attr.pos);
else
throw EvalError("unsupported argument '%s' to '%s', at %s",
attr.name, who, attr.pos);
}
if (!url)
throw EvalError("'url' argument required, at %s", pos);
} else
url = state.forceStringNoCtx(*args[0], pos);
url = resolveUri(*url);
state.checkURI(*url);
if (name == "")
name = baseNameOf(*url);
if (evalSettings.pureEval && !expectedHash)
throw Error("in pure evaluation mode, '%s' requires a 'sha256' argument", who);
auto storePath =
unpack
? fetchers::downloadTarball(state.store, *url, name, (bool) expectedHash).storePath
: fetchers::downloadFile(state.store, *url, name, (bool) expectedHash).storePath;
auto path = state.store->toRealPath(storePath);
if (expectedHash) {
auto hash = unpack
? state.store->queryPathInfo(storePath)->narHash
: hashFile(htSHA256, path);
if (hash != *expectedHash)
throw Error((unsigned int) 102, "hash mismatch in file downloaded from '%s':\n wanted: %s\n got: %s",
*url, expectedHash->to_string(), hash.to_string());
}
if (state.allowedPaths)
state.allowedPaths->insert(path);
mkString(v, path, PathSet({path}));
}
static void prim_fetchurl(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
fetch(state, pos, args, v, "fetchurl", false, "");
}
static void prim_fetchTarball(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
fetch(state, pos, args, v, "fetchTarball", true, "source");
}
static RegisterPrimOp r2("__fetchurl", 1, prim_fetchurl);
static RegisterPrimOp r3("fetchTarball", 1, prim_fetchTarball);
}
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