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This commit is contained in:
Eelco Dolstra 2022-02-15 16:38:22 +01:00
parent e827e6288f
commit 3ec83565b1
11 changed files with 116 additions and 39 deletions
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53
src/libfetchers/path.cc
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@ -81,29 +81,36 @@ struct PathInputScheme : InputScheme
// nothing to do
}
Path getAbsPath(ref<Store> store, const Input & input)
{
auto path = getStrAttr(input.attrs, "path");
if (path[0] == '/')
return path;
if (!input.parent)
throw Error("cannot fetch input '%s' because it uses a relative path", input.to_string());
auto parent = canonPath(*input.parent);
// the path isn't relative, prefix it
auto absPath = nix::absPath(path, parent);
// for security, ensure that if the parent is a store path, it's inside it
if (store->isInStore(parent)) {
auto storePath = store->printStorePath(store->toStorePath(parent).first);
if (!isDirOrInDir(absPath, storePath))
throw BadStorePath("relative path '%s' points outside of its parent's store path '%s'", path, storePath);
}
return absPath;
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override
{
Input input(_input);
std::string absPath;
auto path = getStrAttr(input.attrs, "path");
if (path[0] != '/') {
if (!input.parent)
throw Error("cannot fetch input '%s' because it uses a relative path", input.to_string());
auto parent = canonPath(*input.parent);
// the path isn't relative, prefix it
absPath = nix::absPath(path, parent);
// for security, ensure that if the parent is a store path, it's inside it
if (store->isInStore(parent)) {
auto storePath = store->printStorePath(store->toStorePath(parent).first);
if (!isDirOrInDir(absPath, storePath))
throw BadStorePath("relative path '%s' points outside of its parent's store path '%s'", path, storePath);
}
} else
absPath = path;
auto absPath = getAbsPath(store, input);
Activity act(*logger, lvlTalkative, actUnknown, fmt("copying '%s'", absPath));
@ -125,6 +132,14 @@ struct PathInputScheme : InputScheme
return {std::move(*storePath), input};
}
std::pair<ref<InputAccessor>, Input> lazyFetch(ref<Store> store, const Input & input) override
{
auto absPath = getAbsPath(store, input);
auto input2(input);
input2.attrs.emplace("path", absPath);
return {makeFSInputAccessor(absPath), std::move(input2)};
}
};
static auto rPathInputScheme = OnStartup([] { registerInputScheme(std::make_unique<PathInputScheme>()); });