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resolveLookupPathPath(): Return a SourcePath instead of a string

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Cherry-picked from lazy-trees.
This commit is contained in:
Eelco Dolstra 2024-11-19 18:03:31 +01:00
parent 3b76d01f3b
commit af07f33d37
5 changed files with 21 additions and 24 deletions
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6
src/libcmd/common-eval-args.cc
View File

@ -29,13 +29,13 @@ EvalSettings evalSettings {
{
{
"flake",
[](ref<Store> store, std::string_view rest) {
[](EvalState & state, std::string_view rest) {
experimentalFeatureSettings.require(Xp::Flakes);
// FIXME `parseFlakeRef` should take a `std::string_view`.
auto flakeRef = parseFlakeRef(fetchSettings, std::string { rest }, {}, true, false);
debug("fetching flake search path element '%s''", rest);
auto storePath = flakeRef.resolve(store).fetchTree(store).first;
return store->toRealPath(storePath);
auto storePath = flakeRef.resolve(state.store).fetchTree(state.store).first;
return state.rootPath(state.store->toRealPath(storePath));
},
},
},

8
src/libexpr/eval-settings.hh
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@ -3,10 +3,11 @@
#include "config.hh"
#include "ref.hh"
#include "source-path.hh"
namespace nix {
class Store;
class EvalState;
struct EvalSettings : Config
{
@ -18,11 +19,8 @@ struct EvalSettings : Config
*
* The return value is (a) whether the entry was valid, and, if so,
* what does it map to.
*
* @todo Return (`std::optional` of) `SourceAccssor` or something
* more structured instead of mere `std::string`?
*/
using LookupPathHook = std::optional<std::string>(ref<Store> store, std::string_view);
using LookupPathHook = std::optional<SourcePath>(EvalState & state, std::string_view);
/**
* Map from "scheme" to a `LookupPathHook`.

23
src/libexpr/eval.cc
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@ -3025,8 +3025,8 @@ SourcePath EvalState::findFile(const LookupPath & lookupPath, const std::string_
if (!rOpt) continue;
auto r = *rOpt;
Path res = suffix == "" ? r : concatStrings(r, "/", suffix);
if (pathExists(res)) return rootPath(CanonPath(canonPath(res)));
auto res = (r / CanonPath(suffix)).resolveSymlinks();
if (res.pathExists()) return res;
}
if (hasPrefix(path, "nix/"))
@ -3041,13 +3041,13 @@ SourcePath EvalState::findFile(const LookupPath & lookupPath, const std::string_
}
std::optional<std::string> EvalState::resolveLookupPathPath(const LookupPath::Path & value0, bool initAccessControl)
std::optional<SourcePath> EvalState::resolveLookupPathPath(const LookupPath::Path & value0, bool initAccessControl)
{
auto & value = value0.s;
auto i = lookupPathResolved.find(value);
if (i != lookupPathResolved.end()) return i->second;
auto finish = [&](std::string res) {
auto finish = [&](SourcePath res) {
debug("resolved search path element '%s' to '%s'", value, res);
lookupPathResolved.emplace(value, res);
return res;
@ -3060,7 +3060,7 @@ std::optional<std::string> EvalState::resolveLookupPathPath(const LookupPath::Pa
fetchSettings,
EvalSettings::resolvePseudoUrl(value));
auto storePath = fetchToStore(*store, SourcePath(accessor), FetchMode::Copy);
return finish(store->toRealPath(storePath));
return finish(rootPath(store->toRealPath(storePath)));
} catch (Error & e) {
logWarning({
.msg = HintFmt("Nix search path entry '%1%' cannot be downloaded, ignoring", value)
@ -3072,29 +3072,29 @@ std::optional<std::string> EvalState::resolveLookupPathPath(const LookupPath::Pa
auto scheme = value.substr(0, colPos);
auto rest = value.substr(colPos + 1);
if (auto * hook = get(settings.lookupPathHooks, scheme)) {
auto res = (*hook)(store, rest);
auto res = (*hook)(*this, rest);
if (res)
return finish(std::move(*res));
}
}
{
auto path = absPath(value);
auto path = rootPath(value);
/* Allow access to paths in the search path. */
if (initAccessControl) {
allowPath(path);
if (store->isInStore(path)) {
allowPath(path.path.abs());
if (store->isInStore(path.path.abs())) {
try {
StorePathSet closure;
store->computeFSClosure(store->toStorePath(path).first, closure);
store->computeFSClosure(store->toStorePath(path.path.abs()).first, closure);
for (auto & p : closure)
allowPath(p);
} catch (InvalidPath &) { }
}
}
if (pathExists(path))
if (path.pathExists())
return finish(std::move(path));
else {
logWarning({
@ -3105,7 +3105,6 @@ std::optional<std::string> EvalState::resolveLookupPathPath(const LookupPath::Pa
debug("failed to resolve search path element '%s'", value);
return std::nullopt;
}

6
src/libexpr/eval.hh
View File

@ -347,7 +347,7 @@ private:
LookupPath lookupPath;
std::map<std::string, std::optional<std::string>> lookupPathResolved;
std::map<std::string, std::optional<SourcePath>> lookupPathResolved;
/**
* Cache used by prim_match().
@ -452,9 +452,9 @@ public:
*
* If the specified search path element is a URI, download it.
*
* If it is not found, return `std::nullopt`
* If it is not found, return `std::nullopt`.
*/
std::optional<std::string> resolveLookupPathPath(
std::optional<SourcePath> resolveLookupPathPath(
const LookupPath::Path & elem,
bool initAccessControl = false);

2
tests/functional/restricted.sh
View File

@ -23,7 +23,7 @@ nix-instantiate --restrict-eval ./simple.nix -I src1=./simple.nix -I src2=./conf
(! nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix')
nix-instantiate --restrict-eval --eval -E 'builtins.readFile ./simple.nix' -I src=../..
expectStderr 1 nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' | grepQuiet "forbidden in restricted mode"
expectStderr 1 nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' | grepQuiet "was not found in the Nix search path"
nix-instantiate --restrict-eval --eval -E 'let __nixPath = [ { prefix = "foo"; path = ./.; } ]; in builtins.readFile <foo/simple.nix>' -I src=.
p=$(nix eval --raw --expr "builtins.fetchurl file://${_NIX_TEST_SOURCE_DIR}/restricted.sh" --impure --restrict-eval --allowed-uris "file://${_NIX_TEST_SOURCE_DIR}")