forked from lix-project/lix
Split the parseFlakeRefWithFragment function
Was starting to be very complex and hard to follow. Now the different cases should be easier to understand.
This commit is contained in:
Théophane Hufschmitt
parent
50e61f579c
commit
e8113747e1
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@ -69,127 +69,130 @@ std::optional<FlakeRef> maybeParseFlakeRef(
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}
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}
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std::pair<FlakeRef, std::string> parseFlakeRefWithFragment(
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std::pair<FlakeRef, std::string> parsePathFlakeRefWithFragment(
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const std::string & url,
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const std::optional<Path> & baseDir,
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bool allowMissing,
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bool isFlake)
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{
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using namespace fetchers;
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std::string path = url;
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std::string fragment = "";
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std::map<std::string, std::string> query;
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auto pathEnd = url.find_first_of("#?");
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auto fragmentStart = pathEnd;
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if (pathEnd != std::string::npos && url[pathEnd] == '?') {
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fragmentStart = url.find("#");
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}
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if (pathEnd != std::string::npos) {
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path = url.substr(0, pathEnd);
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}
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if (fragmentStart != std::string::npos) {
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fragment = percentDecode(url.substr(fragmentStart+1));
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}
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if (pathEnd != std::string::npos && fragmentStart != std::string::npos) {
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query = decodeQuery(url.substr(pathEnd+1, fragmentStart));
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}
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if (baseDir) {
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/* Check if 'url' is a path (either absolute or relative
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to 'baseDir'). If so, search upward to the root of the
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repo (i.e. the directory containing .git). */
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path = absPath(path, baseDir);
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if (isFlake) {
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if (!allowMissing && !pathExists(path + "/flake.nix")){
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notice("path '%s' does not contain a 'flake.nix', searching up",path);
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// Save device to detect filesystem boundary
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dev_t device = lstat(path).st_dev;
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bool found = false;
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while (path != "/") {
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if (pathExists(path + "/flake.nix")) {
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found = true;
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break;
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} else if (pathExists(path + "/.git"))
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throw Error("path '%s' is not part of a flake (neither it nor its parent directories contain a 'flake.nix' file)", path);
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else {
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if (lstat(path).st_dev != device)
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throw Error("unable to find a flake before encountering filesystem boundary at '%s'", path);
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}
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path = dirOf(path);
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}
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if (!found)
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throw BadURL("could not find a flake.nix file");
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}
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if (!S_ISDIR(lstat(path).st_mode))
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throw BadURL("path '%s' is not a flake (because it's not a directory)", path);
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if (!allowMissing && !pathExists(path + "/flake.nix"))
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throw BadURL("path '%s' is not a flake (because it doesn't contain a 'flake.nix' file)", path);
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auto flakeRoot = path;
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std::string subdir;
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while (flakeRoot != "/") {
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if (pathExists(flakeRoot + "/.git")) {
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auto base = std::string("git+file://") + flakeRoot;
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auto parsedURL = ParsedURL{
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.url = base, // FIXME
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.base = base,
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.scheme = "git+file",
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.authority = "",
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.path = flakeRoot,
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.query = query,
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};
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if (subdir != "") {
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if (parsedURL.query.count("dir"))
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throw Error("flake URL '%s' has an inconsistent 'dir' parameter", url);
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parsedURL.query.insert_or_assign("dir", subdir);
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}
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if (pathExists(flakeRoot + "/.git/shallow"))
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parsedURL.query.insert_or_assign("shallow", "1");
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return std::make_pair(
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FlakeRef(fetchers::Input::fromURL(parsedURL), getOr(parsedURL.query, "dir", "")),
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fragment);
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}
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subdir = std::string(baseNameOf(flakeRoot)) + (subdir.empty() ? "" : "/" + subdir);
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flakeRoot = dirOf(flakeRoot);
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}
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}
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} else {
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if (!hasPrefix(path, "/"))
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throw BadURL("flake reference '%s' is not an absolute path", url);
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path = canonPath(path + "/" + getOr(query, "dir", ""));
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}
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fetchers::Attrs attrs;
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attrs.insert_or_assign("type", "path");
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attrs.insert_or_assign("path", path);
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return std::make_pair(FlakeRef(fetchers::Input::fromAttrs(std::move(attrs)), ""), fragment);
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};
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/* Check if 'url' is a flake ID. This is an abbreviated syntax for
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'flake:<flake-id>?ref=<ref>&rev=<rev>'. */
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std::optional<std::pair<FlakeRef, std::string>> parseFlakeIdRef(
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const std::string & url,
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bool isFlake
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)
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{
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std::smatch match;
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static std::regex flakeRegex(
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"((" + flakeIdRegexS + ")(?:/(?:" + refAndOrRevRegex + "))?)"
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+ "(?:#(" + queryRegex + "))?",
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std::regex::ECMAScript);
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std::smatch match;
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auto parsePathFlakeRef = [&]() {
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std::string path = url;
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std::string fragment = "";
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std::map<std::string, std::string> query = {};
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auto pathEnd = url.find_first_of("#?");
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auto fragmentStart = pathEnd;
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if (pathEnd != std::string::npos && url[pathEnd] == '?')
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fragmentStart = url.find("#");
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if (pathEnd != std::string::npos) {
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path = url.substr(0, pathEnd);
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}
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if (fragmentStart != std::string::npos) {
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fragment = percentDecode(url.substr(fragmentStart+1));
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}
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if (fragmentStart != std::string::npos && pathEnd != std::string::npos) {
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query = decodeQuery(url.substr(pathEnd+1, fragmentStart));
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}
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if (baseDir) {
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/* Check if 'url' is a path (either absolute or relative
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to 'baseDir'). If so, search upward to the root of the
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repo (i.e. the directory containing .git). */
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path = absPath(path, baseDir);
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if (isFlake) {
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if (!allowMissing && !pathExists(path + "/flake.nix")){
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notice("path '%s' does not contain a 'flake.nix', searching up",path);
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// Save device to detect filesystem boundary
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dev_t device = lstat(path).st_dev;
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bool found = false;
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while (path != "/") {
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if (pathExists(path + "/flake.nix")) {
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found = true;
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break;
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} else if (pathExists(path + "/.git"))
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throw Error("path '%s' is not part of a flake (neither it nor its parent directories contain a 'flake.nix' file)", path);
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else {
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if (lstat(path).st_dev != device)
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throw Error("unable to find a flake before encountering filesystem boundary at '%s'", path);
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}
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path = dirOf(path);
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}
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if (!found)
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throw BadURL("could not find a flake.nix file");
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}
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if (!S_ISDIR(lstat(path).st_mode))
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throw BadURL("path '%s' is not a flake (because it's not a directory)", path);
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if (!allowMissing && !pathExists(path + "/flake.nix"))
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throw BadURL("path '%s' is not a flake (because it doesn't contain a 'flake.nix' file)", path);
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auto flakeRoot = path;
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std::string subdir;
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while (flakeRoot != "/") {
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if (pathExists(flakeRoot + "/.git")) {
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auto base = std::string("git+file://") + flakeRoot;
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auto parsedURL = ParsedURL{
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.url = base, // FIXME
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.base = base,
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.scheme = "git+file",
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.authority = "",
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.path = flakeRoot,
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.query = query,
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};
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if (subdir != "") {
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if (parsedURL.query.count("dir"))
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throw Error("flake URL '%s' has an inconsistent 'dir' parameter", url);
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parsedURL.query.insert_or_assign("dir", subdir);
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}
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if (pathExists(flakeRoot + "/.git/shallow"))
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parsedURL.query.insert_or_assign("shallow", "1");
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return std::make_pair(
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FlakeRef(Input::fromURL(parsedURL, isFlake), getOr(parsedURL.query, "dir", "")),
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fragment);
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}
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subdir = std::string(baseNameOf(flakeRoot)) + (subdir.empty() ? "" : "/" + subdir);
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flakeRoot = dirOf(flakeRoot);
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}
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}
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} else {
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if (!hasPrefix(path, "/"))
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throw BadURL("flake reference '%s' is not an absolute path", url);
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path = canonPath(path + "/" + getOr(query, "dir", ""));
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}
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fetchers::Attrs attrs;
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attrs.insert_or_assign("type", "path");
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attrs.insert_or_assign("path", path);
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return std::make_pair(FlakeRef(Input::fromAttrs(std::move(attrs)), ""), fragment);
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};
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/* Check if 'url' is a flake ID. This is an abbreviated syntax for
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'flake:<flake-id>?ref=<ref>&rev=<rev>'. */
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if (std::regex_match(url, match, flakeRegex)) {
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auto parsedURL = ParsedURL{
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.url = url,
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@ -200,25 +203,53 @@ std::pair<FlakeRef, std::string> parseFlakeRefWithFragment(
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};
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return std::make_pair(
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FlakeRef(Input::fromURL(parsedURL), ""),
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FlakeRef(fetchers::Input::fromURL(parsedURL, isFlake), ""),
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percentDecode(match.str(6)));
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}
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else {
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try {
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auto parsedURL = parseURL(url);
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std::string fragment;
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std::swap(fragment, parsedURL.fragment);
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return {};
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}
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auto input = Input::fromURL(parsedURL, isFlake);
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input.parent = baseDir;
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std::optional<std::pair<FlakeRef, std::string>> parseURLFlakeRef(
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const std::string & url,
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const std::optional<Path> & baseDir,
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bool isFlake
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)
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{
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ParsedURL parsedURL;
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try {
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parsedURL = parseURL(url);
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} catch (BadURL &) {
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return std::nullopt;
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}
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return std::make_pair(
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FlakeRef(std::move(input), getOr(parsedURL.query, "dir", "")),
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fragment);
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} catch (BadURL &) {
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return parsePathFlakeRef();
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}
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std::string fragment;
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std::swap(fragment, parsedURL.fragment);
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auto input = fetchers::Input::fromURL(parsedURL, isFlake);
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input.parent = baseDir;
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return std::make_pair(
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FlakeRef(std::move(input), getOr(parsedURL.query, "dir", "")),
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fragment);
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}
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std::pair<FlakeRef, std::string> parseFlakeRefWithFragment(
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const std::string & url,
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const std::optional<Path> & baseDir,
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bool allowMissing,
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bool isFlake)
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{
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using namespace fetchers;
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std::smatch match;
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if (auto res = parseFlakeIdRef(url, isFlake)) {
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return *res;
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} else if (auto res = parseURLFlakeRef(url, baseDir, isFlake)) {
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return *res;
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} else {
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return parsePathFlakeRefWithFragment(url, baseDir, allowMissing, isFlake);
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}
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}
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