lix/src/libfetchers/indirect.cc
Eelco Dolstra b525d0f20c Input: Replace markFileChanged() by putFile()
Committing a lock file using markFileChanged() required the input to
be writable by the caller in the local filesystem (using the path
returned by getSourcePath()). putFile() abstracts over this.

(cherry picked from commit 95d657c8b3ae4282e24628ba7426edb90c8f3942)
Change-Id: Ie081c5d9eb4e923b229191c5e23ece85145557ff
2024-03-25 15:30:36 +00:00

107 lines
3.6 KiB
C++

#include "fetchers.hh"
#include "url-parts.hh"
#include "path.hh"
namespace nix::fetchers {
std::regex flakeRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript);
struct IndirectInputScheme : InputScheme
{
std::optional<Input> inputFromURL(const ParsedURL & url, bool requireTree) const override
{
if (url.scheme != "flake") return {};
auto path = tokenizeString<std::vector<std::string>>(url.path, "/");
std::optional<Hash> rev;
std::optional<std::string> ref;
if (path.size() == 1) {
} else if (path.size() == 2) {
if (std::regex_match(path[1], revRegex))
rev = Hash::parseAny(path[1], htSHA1);
else if (std::regex_match(path[1], refRegex))
ref = path[1];
else
throw BadURL("in flake URL '%s', '%s' is not a commit hash or branch/tag name", url.url, path[1]);
} else if (path.size() == 3) {
if (!std::regex_match(path[1], refRegex))
throw BadURL("in flake URL '%s', '%s' is not a branch/tag name", url.url, path[1]);
ref = path[1];
if (!std::regex_match(path[2], revRegex))
throw BadURL("in flake URL '%s', '%s' is not a commit hash", url.url, path[2]);
rev = Hash::parseAny(path[2], htSHA1);
} else
throw BadURL("GitHub URL '%s' is invalid", url.url);
std::string id = path[0];
if (!std::regex_match(id, flakeRegex))
throw BadURL("'%s' is not a valid flake ID", id);
// FIXME: forbid query params?
Input input;
input.direct = false;
input.attrs.insert_or_assign("type", "indirect");
input.attrs.insert_or_assign("id", id);
if (rev) input.attrs.insert_or_assign("rev", rev->gitRev());
if (ref) input.attrs.insert_or_assign("ref", *ref);
return input;
}
std::optional<Input> inputFromAttrs(const Attrs & attrs) const override
{
if (maybeGetStrAttr(attrs, "type") != "indirect") return {};
for (auto & [name, value] : attrs)
if (name != "type" && name != "id" && name != "ref" && name != "rev" && name != "narHash")
throw Error("unsupported indirect input attribute '%s'", name);
auto id = getStrAttr(attrs, "id");
if (!std::regex_match(id, flakeRegex))
throw BadURL("'%s' is not a valid flake ID", id);
Input input;
input.direct = false;
input.attrs = attrs;
return input;
}
ParsedURL toURL(const Input & input) const override
{
ParsedURL url;
url.scheme = "flake";
url.path = getStrAttr(input.attrs, "id");
if (auto ref = input.getRef()) { url.path += '/'; url.path += *ref; };
if (auto rev = input.getRev()) { url.path += '/'; url.path += rev->gitRev(); };
return url;
}
bool hasAllInfo(const Input & input) const override
{
return false;
}
Input applyOverrides(
const Input & _input,
std::optional<std::string> ref,
std::optional<Hash> rev) const override
{
auto input(_input);
if (rev) input.attrs.insert_or_assign("rev", rev->gitRev());
if (ref) input.attrs.insert_or_assign("ref", *ref);
return input;
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & input) override
{
throw Error("indirect input '%s' cannot be fetched directly", input.to_string());
}
};
static auto rIndirectInputScheme = OnStartup([] { registerInputScheme(std::make_unique<IndirectInputScheme>()); });
}