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-rw-r--r--src/libfetchers/attrs.cc92
-rw-r--r--src/libfetchers/attrs.hh37
-rw-r--r--src/libfetchers/cache.cc121
-rw-r--r--src/libfetchers/cache.hh34
-rw-r--r--src/libfetchers/fetchers.cc73
-rw-r--r--src/libfetchers/fetchers.hh103
-rw-r--r--src/libfetchers/git.cc401
-rw-r--r--src/libfetchers/github.cc195
-rw-r--r--src/libfetchers/local.mk11
-rw-r--r--src/libfetchers/mercurial.cc303
-rw-r--r--src/libfetchers/tarball.cc277
-rw-r--r--src/libfetchers/tree-info.cc14
-rw-r--r--src/libfetchers/tree-info.hh29
13 files changed, 1690 insertions, 0 deletions
diff --git a/src/libfetchers/attrs.cc b/src/libfetchers/attrs.cc
new file mode 100644
index 000000000..40c02de42
--- /dev/null
+++ b/src/libfetchers/attrs.cc
@@ -0,0 +1,92 @@
+#include "attrs.hh"
+#include "fetchers.hh"
+
+#include <nlohmann/json.hpp>
+
+namespace nix::fetchers {
+
+Attrs jsonToAttrs(const nlohmann::json & json)
+{
+ Attrs attrs;
+
+ for (auto & i : json.items()) {
+ if (i.value().is_number())
+ attrs.emplace(i.key(), i.value().get<int64_t>());
+ else if (i.value().is_string())
+ attrs.emplace(i.key(), i.value().get<std::string>());
+ else if (i.value().is_boolean())
+ attrs.emplace(i.key(), i.value().get<bool>());
+ else
+ throw Error("unsupported input attribute type in lock file");
+ }
+
+ return attrs;
+}
+
+nlohmann::json attrsToJson(const Attrs & attrs)
+{
+ nlohmann::json json;
+ for (auto & attr : attrs) {
+ if (auto v = std::get_if<int64_t>(&attr.second)) {
+ json[attr.first] = *v;
+ } else if (auto v = std::get_if<std::string>(&attr.second)) {
+ json[attr.first] = *v;
+ } else if (auto v = std::get_if<Explicit<bool>>(&attr.second)) {
+ json[attr.first] = v->t;
+ } else abort();
+ }
+ return json;
+}
+
+std::optional<std::string> maybeGetStrAttr(const Attrs & attrs, const std::string & name)
+{
+ auto i = attrs.find(name);
+ if (i == attrs.end()) return {};
+ if (auto v = std::get_if<std::string>(&i->second))
+ return *v;
+ throw Error("input attribute '%s' is not a string %s", name, attrsToJson(attrs).dump());
+}
+
+std::string getStrAttr(const Attrs & attrs, const std::string & name)
+{
+ auto s = maybeGetStrAttr(attrs, name);
+ if (!s)
+ throw Error("input attribute '%s' is missing", name);
+ return *s;
+}
+
+std::optional<int64_t> maybeGetIntAttr(const Attrs & attrs, const std::string & name)
+{
+ auto i = attrs.find(name);
+ if (i == attrs.end()) return {};
+ if (auto v = std::get_if<int64_t>(&i->second))
+ return *v;
+ throw Error("input attribute '%s' is not an integer", name);
+}
+
+int64_t getIntAttr(const Attrs & attrs, const std::string & name)
+{
+ auto s = maybeGetIntAttr(attrs, name);
+ if (!s)
+ throw Error("input attribute '%s' is missing", name);
+ return *s;
+}
+
+std::optional<bool> maybeGetBoolAttr(const Attrs & attrs, const std::string & name)
+{
+ auto i = attrs.find(name);
+ if (i == attrs.end()) return {};
+ if (auto v = std::get_if<int64_t>(&i->second))
+ return *v;
+ throw Error("input attribute '%s' is not a Boolean", name);
+}
+
+bool getBoolAttr(const Attrs & attrs, const std::string & name)
+{
+ auto s = maybeGetBoolAttr(attrs, name);
+ if (!s)
+ throw Error("input attribute '%s' is missing", name);
+ return *s;
+}
+
+}
diff --git a/src/libfetchers/attrs.hh b/src/libfetchers/attrs.hh
new file mode 100644
index 000000000..2c9e772d2
--- /dev/null
+++ b/src/libfetchers/attrs.hh
@@ -0,0 +1,37 @@
+#pragma once
+
+#include "types.hh"
+
+#include <variant>
+
+#include <nlohmann/json_fwd.hpp>
+
+namespace nix::fetchers {
+
+/* Wrap bools to prevent string literals (i.e. 'char *') from being
+ cast to a bool in Attr. */
+template<typename T>
+struct Explicit {
+ T t;
+};
+
+typedef std::variant<std::string, int64_t, Explicit<bool>> Attr;
+typedef std::map<std::string, Attr> Attrs;
+
+Attrs jsonToAttrs(const nlohmann::json & json);
+
+nlohmann::json attrsToJson(const Attrs & attrs);
+
+std::optional<std::string> maybeGetStrAttr(const Attrs & attrs, const std::string & name);
+
+std::string getStrAttr(const Attrs & attrs, const std::string & name);
+
+std::optional<int64_t> maybeGetIntAttr(const Attrs & attrs, const std::string & name);
+
+int64_t getIntAttr(const Attrs & attrs, const std::string & name);
+
+std::optional<bool> maybeGetBoolAttr(const Attrs & attrs, const std::string & name);
+
+bool getBoolAttr(const Attrs & attrs, const std::string & name);
+
+}
diff --git a/src/libfetchers/cache.cc b/src/libfetchers/cache.cc
new file mode 100644
index 000000000..e1c7f3dee
--- /dev/null
+++ b/src/libfetchers/cache.cc
@@ -0,0 +1,121 @@
+#include "cache.hh"
+#include "sqlite.hh"
+#include "sync.hh"
+#include "store-api.hh"
+
+#include <nlohmann/json.hpp>
+
+namespace nix::fetchers {
+
+static const char * schema = R"sql(
+
+create table if not exists Cache (
+ input text not null,
+ info text not null,
+ path text not null,
+ immutable integer not null,
+ timestamp integer not null,
+ primary key (input)
+);
+)sql";
+
+struct CacheImpl : Cache
+{
+ struct State
+ {
+ SQLite db;
+ SQLiteStmt add, lookup;
+ };
+
+ Sync<State> _state;
+
+ CacheImpl()
+ {
+ auto state(_state.lock());
+
+ auto dbPath = getCacheDir() + "/nix/fetcher-cache-v1.sqlite";
+ createDirs(dirOf(dbPath));
+
+ state->db = SQLite(dbPath);
+ state->db.isCache();
+ state->db.exec(schema);
+
+ state->add.create(state->db,
+ "insert or replace into Cache(input, info, path, immutable, timestamp) values (?, ?, ?, ?, ?)");
+
+ state->lookup.create(state->db,
+ "select info, path, immutable, timestamp from Cache where input = ?");
+ }
+
+ void add(
+ ref<Store> store,
+ const Attrs & inAttrs,
+ const Attrs & infoAttrs,
+ const StorePath & storePath,
+ bool immutable) override
+ {
+ _state.lock()->add.use()
+ (attrsToJson(inAttrs).dump())
+ (attrsToJson(infoAttrs).dump())
+ (store->printStorePath(storePath))
+ (immutable)
+ (time(0)).exec();
+ }
+
+ std::optional<std::pair<Attrs, StorePath>> lookup(
+ ref<Store> store,
+ const Attrs & inAttrs) override
+ {
+ if (auto res = lookupExpired(store, inAttrs)) {
+ if (!res->expired)
+ return std::make_pair(std::move(res->infoAttrs), std::move(res->storePath));
+ debug("ignoring expired cache entry '%s'",
+ attrsToJson(inAttrs).dump());
+ }
+ return {};
+ }
+
+ std::optional<Result> lookupExpired(
+ ref<Store> store,
+ const Attrs & inAttrs) override
+ {
+ auto state(_state.lock());
+
+ auto inAttrsJson = attrsToJson(inAttrs).dump();
+
+ auto stmt(state->lookup.use()(inAttrsJson));
+ if (!stmt.next()) {
+ debug("did not find cache entry for '%s'", inAttrsJson);
+ return {};
+ }
+
+ auto infoJson = stmt.getStr(0);
+ auto storePath = store->parseStorePath(stmt.getStr(1));
+ auto immutable = stmt.getInt(2) != 0;
+ auto timestamp = stmt.getInt(3);
+
+ store->addTempRoot(storePath);
+ if (!store->isValidPath(storePath)) {
+ // FIXME: we could try to substitute 'storePath'.
+ debug("ignoring disappeared cache entry '%s'", inAttrsJson);
+ return {};
+ }
+
+ debug("using cache entry '%s' -> '%s', '%s'",
+ inAttrsJson, infoJson, store->printStorePath(storePath));
+
+ return Result {
+ .expired = !immutable && (settings.tarballTtl.get() == 0 || timestamp + settings.tarballTtl < time(0)),
+ .infoAttrs = jsonToAttrs(nlohmann::json::parse(infoJson)),
+ .storePath = std::move(storePath)
+ };
+ }
+};
+
+ref<Cache> getCache()
+{
+ static auto cache = std::make_shared<CacheImpl>();
+ return ref<Cache>(cache);
+}
+
+}
diff --git a/src/libfetchers/cache.hh b/src/libfetchers/cache.hh
new file mode 100644
index 000000000..d76ab1233
--- /dev/null
+++ b/src/libfetchers/cache.hh
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "fetchers.hh"
+
+namespace nix::fetchers {
+
+struct Cache
+{
+ virtual void add(
+ ref<Store> store,
+ const Attrs & inAttrs,
+ const Attrs & infoAttrs,
+ const StorePath & storePath,
+ bool immutable) = 0;
+
+ virtual std::optional<std::pair<Attrs, StorePath>> lookup(
+ ref<Store> store,
+ const Attrs & inAttrs) = 0;
+
+ struct Result
+ {
+ bool expired = false;
+ Attrs infoAttrs;
+ StorePath storePath;
+ };
+
+ virtual std::optional<Result> lookupExpired(
+ ref<Store> store,
+ const Attrs & inAttrs) = 0;
+};
+
+ref<Cache> getCache();
+
+}
diff --git a/src/libfetchers/fetchers.cc b/src/libfetchers/fetchers.cc
new file mode 100644
index 000000000..25d3da431
--- /dev/null
+++ b/src/libfetchers/fetchers.cc
@@ -0,0 +1,73 @@
+#include "fetchers.hh"
+#include "store-api.hh"
+
+#include <nlohmann/json.hpp>
+
+namespace nix::fetchers {
+
+std::unique_ptr<std::vector<std::unique_ptr<InputScheme>>> inputSchemes = nullptr;
+
+void registerInputScheme(std::unique_ptr<InputScheme> && inputScheme)
+{
+ if (!inputSchemes) inputSchemes = std::make_unique<std::vector<std::unique_ptr<InputScheme>>>();
+ inputSchemes->push_back(std::move(inputScheme));
+}
+
+std::unique_ptr<Input> inputFromURL(const ParsedURL & url)
+{
+ for (auto & inputScheme : *inputSchemes) {
+ auto res = inputScheme->inputFromURL(url);
+ if (res) return res;
+ }
+ throw Error("input '%s' is unsupported", url.url);
+}
+
+std::unique_ptr<Input> inputFromURL(const std::string & url)
+{
+ return inputFromURL(parseURL(url));
+}
+
+std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs)
+{
+ for (auto & inputScheme : *inputSchemes) {
+ auto res = inputScheme->inputFromAttrs(attrs);
+ if (res) {
+ if (auto narHash = maybeGetStrAttr(attrs, "narHash"))
+ // FIXME: require SRI hash.
+ res->narHash = Hash(*narHash);
+ return res;
+ }
+ }
+ throw Error("input '%s' is unsupported", attrsToJson(attrs));
+}
+
+Attrs Input::toAttrs() const
+{
+ auto attrs = toAttrsInternal();
+ if (narHash)
+ attrs.emplace("narHash", narHash->to_string(SRI));
+ attrs.emplace("type", type());
+ return attrs;
+}
+
+std::pair<Tree, std::shared_ptr<const Input>> Input::fetchTree(ref<Store> store) const
+{
+ auto [tree, input] = fetchTreeInternal(store);
+
+ if (tree.actualPath == "")
+ tree.actualPath = store->toRealPath(tree.storePath);
+
+ if (!tree.info.narHash)
+ tree.info.narHash = store->queryPathInfo(tree.storePath)->narHash;
+
+ if (input->narHash)
+ assert(input->narHash == tree.info.narHash);
+
+ if (narHash && narHash != input->narHash)
+ throw Error("NAR hash mismatch in input '%s' (%s), expected '%s', got '%s'",
+ to_string(), tree.actualPath, narHash->to_string(SRI), input->narHash->to_string(SRI));
+
+ return {std::move(tree), input};
+}
+
+}
diff --git a/src/libfetchers/fetchers.hh b/src/libfetchers/fetchers.hh
new file mode 100644
index 000000000..59a58ae67
--- /dev/null
+++ b/src/libfetchers/fetchers.hh
@@ -0,0 +1,103 @@
+#pragma once
+
+#include "types.hh"
+#include "hash.hh"
+#include "path.hh"
+#include "tree-info.hh"
+#include "attrs.hh"
+#include "url.hh"
+
+#include <memory>
+
+namespace nix { class Store; }
+
+namespace nix::fetchers {
+
+struct Input;
+
+struct Tree
+{
+ Path actualPath;
+ StorePath storePath;
+ TreeInfo info;
+};
+
+struct Input : std::enable_shared_from_this<Input>
+{
+ std::optional<Hash> narHash; // FIXME: implement
+
+ virtual std::string type() const = 0;
+
+ virtual ~Input() { }
+
+ virtual bool operator ==(const Input & other) const { return false; }
+
+ /* Check whether this is a "direct" input, that is, not
+ one that goes through a registry. */
+ virtual bool isDirect() const { return true; }
+
+ /* Check whether this is an "immutable" input, that is,
+ one that contains a commit hash or content hash. */
+ virtual bool isImmutable() const { return (bool) narHash; }
+
+ virtual bool contains(const Input & other) const { return false; }
+
+ virtual std::optional<std::string> getRef() const { return {}; }
+
+ virtual std::optional<Hash> getRev() const { return {}; }
+
+ virtual ParsedURL toURL() const = 0;
+
+ std::string to_string() const
+ {
+ return toURL().to_string();
+ }
+
+ Attrs toAttrs() const;
+
+ std::pair<Tree, std::shared_ptr<const Input>> fetchTree(ref<Store> store) const;
+
+private:
+
+ virtual std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(ref<Store> store) const = 0;
+
+ virtual Attrs toAttrsInternal() const = 0;
+};
+
+struct InputScheme
+{
+ virtual ~InputScheme() { }
+
+ virtual std::unique_ptr<Input> inputFromURL(const ParsedURL & url) = 0;
+
+ virtual std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) = 0;
+};
+
+std::unique_ptr<Input> inputFromURL(const ParsedURL & url);
+
+std::unique_ptr<Input> inputFromURL(const std::string & url);
+
+std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs);
+
+void registerInputScheme(std::unique_ptr<InputScheme> && fetcher);
+
+struct DownloadFileResult
+{
+ StorePath storePath;
+ std::string etag;
+ std::string effectiveUrl;
+};
+
+DownloadFileResult downloadFile(
+ ref<Store> store,
+ const std::string & url,
+ const std::string & name,
+ bool immutable);
+
+Tree downloadTarball(
+ ref<Store> store,
+ const std::string & url,
+ const std::string & name,
+ bool immutable);
+
+}
diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
new file mode 100644
index 000000000..cee0713f4
--- /dev/null
+++ b/src/libfetchers/git.cc
@@ -0,0 +1,401 @@
+#include "fetchers.hh"
+#include "cache.hh"
+#include "globals.hh"
+#include "tarfile.hh"
+#include "store-api.hh"
+
+#include <sys/time.h>
+
+using namespace std::string_literals;
+
+namespace nix::fetchers {
+
+static std::string readHead(const Path & path)
+{
+ return chomp(runProgram("git", true, { "-C", path, "rev-parse", "--abbrev-ref", "HEAD" }));
+}
+
+struct GitInput : Input
+{
+ ParsedURL url;
+ std::optional<std::string> ref;
+ std::optional<Hash> rev;
+ bool shallow = false;
+
+ GitInput(const ParsedURL & url) : url(url)
+ { }
+
+ std::string type() const override { return "git"; }
+
+ bool operator ==(const Input & other) const override
+ {
+ auto other2 = dynamic_cast<const GitInput *>(&other);
+ return
+ other2
+ && url == other2->url
+ && rev == other2->rev
+ && ref == other2->ref;
+ }
+
+ bool isImmutable() const override
+ {
+ return (bool) rev;
+ }
+
+ std::optional<std::string> getRef() const override { return ref; }
+
+ std::optional<Hash> getRev() const override { return rev; }
+
+ ParsedURL toURL() const override
+ {
+ ParsedURL url2(url);
+ if (url2.scheme != "git") url2.scheme = "git+" + url2.scheme;
+ if (rev) url2.query.insert_or_assign("rev", rev->gitRev());
+ if (ref) url2.query.insert_or_assign("ref", *ref);
+ if (shallow) url2.query.insert_or_assign("shallow", "1");
+ return url2;
+ }
+
+ Attrs toAttrsInternal() const override
+ {
+ Attrs attrs;
+ attrs.emplace("url", url.to_string());
+ if (ref)
+ attrs.emplace("ref", *ref);
+ if (rev)
+ attrs.emplace("rev", rev->gitRev());
+ if (shallow)
+ attrs.emplace("shallow", true);
+ return attrs;
+ }
+
+ std::pair<bool, std::string> getActualUrl() const
+ {
+ // Don't clone file:// URIs (but otherwise treat them the
+ // same as remote URIs, i.e. don't use the working tree or
+ // HEAD).
+ static bool forceHttp = getEnv("_NIX_FORCE_HTTP") == "1"; // for testing
+ bool isLocal = url.scheme == "file" && !forceHttp;
+ return {isLocal, isLocal ? url.path : url.base};
+ }
+
+ std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
+ {
+ auto name = "source";
+
+ auto input = std::make_shared<GitInput>(*this);
+
+ assert(!rev || rev->type == htSHA1);
+
+ auto cacheType = shallow ? "git-shallow" : "git";
+
+ auto getImmutableAttrs = [&]()
+ {
+ return Attrs({
+ {"type", cacheType},
+ {"name", name},
+ {"rev", input->rev->gitRev()},
+ });
+ };
+
+ auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath)
+ -> std::pair<Tree, std::shared_ptr<const Input>>
+ {
+ assert(input->rev);
+ assert(!rev || rev == input->rev);
+ return {
+ Tree {
+ .actualPath = store->toRealPath(storePath),
+ .storePath = std::move(storePath),
+ .info = TreeInfo {
+ .revCount = shallow ? std::nullopt : std::optional(getIntAttr(infoAttrs, "revCount")),
+ .lastModified = getIntAttr(infoAttrs, "lastModified"),
+ },
+ },
+ input
+ };
+ };
+
+ if (rev) {
+ if (auto res = getCache()->lookup(store, getImmutableAttrs()))
+ return makeResult(res->first, std::move(res->second));
+ }
+
+ auto [isLocal, actualUrl_] = getActualUrl();
+ auto actualUrl = actualUrl_; // work around clang bug
+
+ // If this is a local directory and no ref or revision is
+ // given, then allow the use of an unclean working tree.
+ if (!input->ref && !input->rev && isLocal) {
+ bool clean = false;
+
+ /* Check whether this repo has any commits. There are
+ probably better ways to do this. */
+ auto gitDir = actualUrl + "/.git";
+ auto commonGitDir = chomp(runProgram(
+ "git",
+ true,
+ { "-C", actualUrl, "rev-parse", "--git-common-dir" }
+ ));
+ if (commonGitDir != ".git")
+ gitDir = commonGitDir;
+
+ bool haveCommits = !readDirectory(gitDir + "/refs/heads").empty();
+
+ try {
+ if (haveCommits) {
+ runProgram("git", true, { "-C", actualUrl, "diff-index", "--quiet", "HEAD", "--" });
+ clean = true;
+ }
+ } catch (ExecError & e) {
+ if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
+ }
+
+ if (!clean) {
+
+ /* This is an unclean working tree. So copy all tracked files. */
+
+ if (!settings.allowDirty)
+ throw Error("Git tree '%s' is dirty", actualUrl);
+
+ if (settings.warnDirty)
+ warn("Git tree '%s' is dirty", actualUrl);
+
+ auto files = tokenizeString<std::set<std::string>>(
+ runProgram("git", true, { "-C", actualUrl, "ls-files", "-z" }), "\0"s);
+
+ PathFilter filter = [&](const Path & p) -> bool {
+ assert(hasPrefix(p, actualUrl));
+ std::string file(p, actualUrl.size() + 1);
+
+ auto st = lstat(p);
+
+ if (S_ISDIR(st.st_mode)) {
+ auto prefix = file + "/";
+ auto i = files.lower_bound(prefix);
+ return i != files.end() && hasPrefix(*i, prefix);
+ }
+
+ return files.count(file);
+ };
+
+ auto storePath = store->addToStore("source", actualUrl, true, htSHA256, filter);
+
+ auto tree = Tree {
+ .actualPath = store->printStorePath(storePath),
+ .storePath = std::move(storePath),
+ .info = TreeInfo {
+ // FIXME: maybe we should use the timestamp of the last
+ // modified dirty file?
+ .lastModified = haveCommits ? std::stoull(runProgram("git", true, { "-C", actualUrl, "log", "-1", "--format=%ct", "HEAD" })) : 0,
+ }
+ };
+
+ return {std::move(tree), input};
+ }
+ }
+
+ if (!input->ref) input->ref = isLocal ? readHead(actualUrl) : "master";
+
+ Attrs mutableAttrs({
+ {"type", cacheType},
+ {"name", name},
+ {"url", actualUrl},
+ {"ref", *input->ref},
+ });
+
+ Path repoDir;
+
+ if (isLocal) {
+
+ if (!input->rev)
+ input->rev = Hash(chomp(runProgram("git", true, { "-C", actualUrl, "rev-parse", *input->ref })), htSHA1);
+
+ repoDir = actualUrl;
+
+ } else {
+
+ if (auto res = getCache()->lookup(store, mutableAttrs)) {
+ auto rev2 = Hash(getStrAttr(res->first, "rev"), htSHA1);
+ if (!rev || rev == rev2) {
+ input->rev = rev2;
+ return makeResult(res->first, std::move(res->second));
+ }
+ }
+
+ Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
+ repoDir = cacheDir;
+
+ if (!pathExists(cacheDir)) {
+ createDirs(dirOf(cacheDir));
+ runProgram("git", true, { "init", "--bare", repoDir });
+ }
+
+ Path localRefFile =
+ input->ref->compare(0, 5, "refs/") == 0
+ ? cacheDir + "/" + *input->ref
+ : cacheDir + "/refs/heads/" + *input->ref;
+
+ bool doFetch;
+ time_t now = time(0);
+
+ /* If a rev was specified, we need to fetch if it's not in the
+ repo. */
+ if (input->rev) {
+ try {
+ runProgram("git", true, { "-C", repoDir, "cat-file", "-e", input->rev->gitRev() });
+ doFetch = false;
+ } catch (ExecError & e) {
+ if (WIFEXITED(e.status)) {
+ doFetch = true;
+ } else {
+ throw;
+ }
+ }
+ } else {
+ /* If the local ref is older than ‘tarball-ttl’ seconds, do a
+ git fetch to update the local ref to the remote ref. */
+ struct stat st;
+ doFetch = stat(localRefFile.c_str(), &st) != 0 ||
+ (uint64_t) st.st_mtime + settings.tarballTtl <= (uint64_t) now;
+ }
+
+ if (doFetch) {
+ Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Git repository '%s'", actualUrl));
+
+ // FIXME: git stderr messes up our progress indicator, so
+ // we're using --quiet for now. Should process its stderr.
+ try {
+ runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", actualUrl, fmt("%s:%s", *input->ref, *input->ref) });
+ } catch (Error & e) {
+ if (!pathExists(localRefFile)) throw;
+ warn("could not update local clone of Git repository '%s'; continuing with the most recent version", actualUrl);
+ }
+
+ struct timeval times[2];
+ times[0].tv_sec = now;
+ times[0].tv_usec = 0;
+ times[1].tv_sec = now;
+ times[1].tv_usec = 0;
+
+ utimes(localRefFile.c_str(), times);
+ }
+
+ if (!input->rev)
+ input->rev = Hash(chomp(readFile(localRefFile)), htSHA1);
+ }
+
+ bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true";
+
+ if (isShallow && !shallow)
+ throw Error("'%s' is a shallow Git repository, but a non-shallow repository is needed", actualUrl);
+
+ // FIXME: check whether rev is an ancestor of ref.
+
+ printTalkative("using revision %s of repo '%s'", input->rev->gitRev(), actualUrl);
+
+ /* Now that we know the ref, check again whether we have it in
+ the store. */
+ if (auto res = getCache()->lookup(store, getImmutableAttrs()))
+ return makeResult(res->first, std::move(res->second));
+
+ // FIXME: should pipe this, or find some better way to extract a
+ // revision.
+ auto source = sinkToSource([&](Sink & sink) {
+ RunOptions gitOptions("git", { "-C", repoDir, "archive", input->rev->gitRev() });
+ gitOptions.standardOut = &sink;
+ runProgram2(gitOptions);
+ });
+
+ Path tmpDir = createTempDir();
+ AutoDelete delTmpDir(tmpDir, true);
+
+ unpackTarfile(*source, tmpDir);
+
+ auto storePath = store->addToStore(name, tmpDir);
+
+ auto lastModified = std::stoull(runProgram("git", true, { "-C", repoDir, "log", "-1", "--format=%ct", input->rev->gitRev() }));
+
+ Attrs infoAttrs({
+ {"rev", input->rev->gitRev()},
+ {"lastModified", lastModified},
+ });
+
+ if (!shallow)
+ infoAttrs.insert_or_assign("revCount",
+ std::stoull(runProgram("git", true, { "-C", repoDir, "rev-list", "--count", input->rev->gitRev() })));
+
+ if (!this->rev)
+ getCache()->add(
+ store,
+ mutableAttrs,
+ infoAttrs,
+ storePath,
+ false);
+
+ getCache()->add(
+ store,
+ getImmutableAttrs(),
+ infoAttrs,
+ storePath,
+ true);
+
+ return makeResult(infoAttrs, std::move(storePath));
+ }
+};
+
+struct GitInputScheme : InputScheme
+{
+ std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
+ {
+ if (url.scheme != "git" &&
+ url.scheme != "git+http" &&
+ url.scheme != "git+https" &&
+ url.scheme != "git+ssh" &&
+ url.scheme != "git+file") return nullptr;
+
+ auto url2(url);
+ if (hasPrefix(url2.scheme, "git+")) url2.scheme = std::string(url2.scheme, 4);
+ url2.query.clear();
+
+ Attrs attrs;
+ attrs.emplace("type", "git");
+
+ for (auto &[name, value] : url.query) {
+ if (name == "rev" || name == "ref")
+ attrs.emplace(name, value);
+ else
+ url2.query.emplace(name, value);
+ }
+
+ attrs.emplace("url", url2.to_string());
+
+ return inputFromAttrs(attrs);
+ }
+
+ std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
+ {
+ if (maybeGetStrAttr(attrs, "type") != "git") return {};
+
+ for (auto & [name, value] : attrs)
+ if (name != "type" && name != "url" && name != "ref" && name != "rev" && name != "shallow")
+ throw Error("unsupported Git input attribute '%s'", name);
+
+ auto input = std::make_unique<GitInput>(parseURL(getStrAttr(attrs, "url")));
+ if (auto ref = maybeGetStrAttr(attrs, "ref")) {
+ if (!std::regex_match(*ref, refRegex))
+ throw BadURL("invalid Git branch/tag name '%s'", *ref);
+ input->ref = *ref;
+ }
+ if (auto rev = maybeGetStrAttr(attrs, "rev"))
+ input->rev = Hash(*rev, htSHA1);
+
+ input->shallow = maybeGetBoolAttr(attrs, "shallow").value_or(false);
+
+ return input;
+ }
+};
+
+static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<GitInputScheme>()); });
+
+}
diff --git a/src/libfetchers/github.cc b/src/libfetchers/github.cc
new file mode 100644
index 000000000..3fc95ff51
--- /dev/null
+++ b/src/libfetchers/github.cc
@@ -0,0 +1,195 @@
+#include "download.hh"
+#include "cache.hh"
+#include "fetchers.hh"
+#include "globals.hh"
+#include "store-api.hh"
+
+#include <nlohmann/json.hpp>
+
+namespace nix::fetchers {
+
+std::regex ownerRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript);
+std::regex repoRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript);
+
+struct GitHubInput : Input
+{
+ std::string owner;
+ std::string repo;
+ std::optional<std::string> ref;
+ std::optional<Hash> rev;
+
+ std::string type() const override { return "github"; }
+
+ bool operator ==(const Input & other) const override
+ {
+ auto other2 = dynamic_cast<const GitHubInput *>(&other);
+ return
+ other2
+ && owner == other2->owner
+ && repo == other2->repo
+ && rev == other2->rev
+ && ref == other2->ref;
+ }
+
+ bool isImmutable() const override
+ {
+ return (bool) rev;
+ }
+
+ std::optional<std::string> getRef() const override { return ref; }
+
+ std::optional<Hash> getRev() const override { return rev; }
+
+ ParsedURL toURL() const override
+ {
+ auto path = owner + "/" + repo;
+ assert(!(ref && rev));
+ if (ref) path += "/" + *ref;
+ if (rev) path += "/" + rev->to_string(Base16, false);
+ return ParsedURL {
+ .scheme = "github",
+ .path = path,
+ };
+ }
+
+ Attrs toAttrsInternal() const override
+ {
+ Attrs attrs;
+ attrs.emplace("owner", owner);
+ attrs.emplace("repo", repo);
+ if (ref)
+ attrs.emplace("ref", *ref);
+ if (rev)
+ attrs.emplace("rev", rev->gitRev());
+ return attrs;
+ }
+
+ std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
+ {
+ auto rev = this->rev;
+ auto ref = this->ref.value_or("master");
+
+ if (!rev) {
+ auto url = fmt("https://api.github.com/repos/%s/%s/commits/%s",
+ owner, repo, ref);
+ auto json = nlohmann::json::parse(
+ readFile(
+ store->toRealPath(
+ downloadFile(store, url, "source", false).storePath)));
+ rev = Hash(json["sha"], htSHA1);
+ debug("HEAD revision for '%s' is %s", url, rev->gitRev());
+ }
+
+ auto input = std::make_shared<GitHubInput>(*this);
+ input->ref = {};
+ input->rev = *rev;
+
+ Attrs immutableAttrs({
+ {"type", "git-tarball"},
+ {"rev", rev->gitRev()},
+ });
+
+ if (auto res = getCache()->lookup(store, immutableAttrs)) {
+ return {
+ Tree{
+ .actualPath = store->toRealPath(res->second),
+ .storePath = std::move(res->second),
+ .info = TreeInfo {
+ .lastModified = getIntAttr(res->first, "lastModified"),
+ },
+ },
+ input
+ };
+ }
+
+ // FIXME: use regular /archive URLs instead? api.github.com
+ // might have stricter rate limits.
+
+ auto url = fmt("https://api.github.com/repos/%s/%s/tarball/%s",
+ owner, repo, rev->to_string(Base16, false));
+
+ std::string accessToken = settings.githubAccessToken.get();
+ if (accessToken != "")
+ url += "?access_token=" + accessToken;
+
+ auto tree = downloadTarball(store, url, "source", true);
+
+ getCache()->add(
+ store,
+ immutableAttrs,
+ {
+ {"rev", rev->gitRev()},
+ {"lastModified", *tree.info.lastModified}
+ },
+ tree.storePath,
+ true);
+
+ return {std::move(tree), input};
+ }
+};
+
+struct GitHubInputScheme : InputScheme
+{
+ std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
+ {
+ if (url.scheme != "github") return nullptr;
+
+ auto path = tokenizeString<std::vector<std::string>>(url.path, "/");
+ auto input = std::make_unique<GitHubInput>();
+
+ if (path.size() == 2) {
+ } else if (path.size() == 3) {
+ if (std::regex_match(path[2], revRegex))
+ input->rev = Hash(path[2], htSHA1);
+ else if (std::regex_match(path[2], refRegex))
+ input->ref = path[2];
+ else
+ throw BadURL("in GitHub URL '%s', '%s' is not a commit hash or branch/tag name", url.url, path[2]);
+ } else
+ throw BadURL("GitHub URL '%s' is invalid", url.url);
+
+ for (auto &[name, value] : url.query) {
+ if (name == "rev") {
+ if (input->rev)
+ throw BadURL("GitHub URL '%s' contains multiple commit hashes", url.url);
+ input->rev = Hash(value, htSHA1);
+ }
+ else if (name == "ref") {
+ if (!std::regex_match(value, refRegex))
+ throw BadURL("GitHub URL '%s' contains an invalid branch/tag name", url.url);
+ if (input->ref)
+ throw BadURL("GitHub URL '%s' contains multiple branch/tag names", url.url);
+ input->ref = value;
+ }
+ }
+
+ if (input->ref && input->rev)
+ throw BadURL("GitHub URL '%s' contains both a commit hash and a branch/tag name", url.url);
+
+ input->owner = path[0];
+ input->repo = path[1];
+
+ return input;
+ }
+
+ std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
+ {
+ if (maybeGetStrAttr(attrs, "type") != "github") return {};
+
+ for (auto & [name, value] : attrs)
+ if (name != "type" && name != "owner" && name != "repo" && name != "ref" && name != "rev")
+ throw Error("unsupported GitHub input attribute '%s'", name);
+
+ auto input = std::make_unique<GitHubInput>();
+ input->owner = getStrAttr(attrs, "owner");
+ input->repo = getStrAttr(attrs, "repo");
+ input->ref = maybeGetStrAttr(attrs, "ref");
+ if (auto rev = maybeGetStrAttr(attrs, "rev"))
+ input->rev = Hash(*rev, htSHA1);
+ return input;
+ }
+};
+
+static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<GitHubInputScheme>()); });
+
+}
diff --git a/src/libfetchers/local.mk b/src/libfetchers/local.mk
new file mode 100644
index 000000000..d7143d8a6
--- /dev/null
+++ b/src/libfetchers/local.mk
@@ -0,0 +1,11 @@
+libraries += libfetchers
+
+libfetchers_NAME = libnixfetchers
+
+libfetchers_DIR := $(d)
+
+libfetchers_SOURCES := $(wildcard $(d)/*.cc)
+
+libfetchers_CXXFLAGS += -I src/libutil -I src/libstore
+
+libfetchers_LIBS = libutil libstore libnixrust
diff --git a/src/libfetchers/mercurial.cc b/src/libfetchers/mercurial.cc
new file mode 100644
index 000000000..790f7c753
--- /dev/null
+++ b/src/libfetchers/mercurial.cc
@@ -0,0 +1,303 @@
+#include "fetchers.hh"
+#include "cache.hh"
+#include "globals.hh"
+#include "tarfile.hh"
+#include "store-api.hh"
+
+#include <sys/time.h>
+
+using namespace std::string_literals;
+
+namespace nix::fetchers {
+
+struct MercurialInput : Input
+{
+ ParsedURL url;
+ std::optional<std::string> ref;
+ std::optional<Hash> rev;
+
+ MercurialInput(const ParsedURL & url) : url(url)
+ { }
+
+ std::string type() const override { return "hg"; }
+
+ bool operator ==(const Input & other) const override
+ {
+ auto other2 = dynamic_cast<const MercurialInput *>(&other);
+ return
+ other2
+ && url == other2->url
+ && rev == other2->rev
+ && ref == other2->ref;
+ }
+
+ bool isImmutable() const override
+ {
+ return (bool) rev;
+ }
+
+ std::optional<std::string> getRef() const override { return ref; }
+
+ std::optional<Hash> getRev() const override { return rev; }
+
+ ParsedURL toURL() const override
+ {
+ ParsedURL url2(url);
+ url2.scheme = "hg+" + url2.scheme;
+ if (rev) url2.query.insert_or_assign("rev", rev->gitRev());
+ if (ref) url2.query.insert_or_assign("ref", *ref);
+ return url;
+ }
+
+ Attrs toAttrsInternal() const override
+ {
+ Attrs attrs;
+ attrs.emplace("url", url.to_string());
+ if (ref)
+ attrs.emplace("ref", *ref);
+ if (rev)
+ attrs.emplace("rev", rev->gitRev());
+ return attrs;
+ }
+
+ std::pair<bool, std::string> getActualUrl() const
+ {
+ bool isLocal = url.scheme == "file";
+ return {isLocal, isLocal ? url.path : url.base};
+ }
+
+ std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
+ {
+ auto name = "source";
+
+ auto input = std::make_shared<MercurialInput>(*this);
+
+ auto [isLocal, actualUrl_] = getActualUrl();
+ auto actualUrl = actualUrl_; // work around clang bug
+
+ // FIXME: return lastModified.
+
+ // FIXME: don't clone local repositories.
+
+ if (!input->ref && !input->rev && isLocal && pathExists(actualUrl + "/.hg")) {
+
+ bool clean = runProgram("hg", true, { "status", "-R", actualUrl, "--modified", "--added", "--removed" }) == "";
+
+ if (!clean) {
+
+ /* This is an unclean working tree. So copy all tracked
+ files. */
+
+ if (!settings.allowDirty)
+ throw Error("Mercurial tree '%s' is unclean", actualUrl);
+
+ if (settings.warnDirty)
+ warn("Mercurial tree '%s' is unclean", actualUrl);
+
+ input->ref = chomp(runProgram("hg", true, { "branch", "-R", actualUrl }));
+
+ auto files = tokenizeString<std::set<std::string>>(
+ runProgram("hg", true, { "status", "-R", actualUrl, "--clean", "--modified", "--added", "--no-status", "--print0" }), "\0"s);
+
+ PathFilter filter = [&](const Path & p) -> bool {
+ assert(hasPrefix(p, actualUrl));
+ std::string file(p, actualUrl.size() + 1);
+
+ auto st = lstat(p);
+
+ if (S_ISDIR(st.st_mode)) {
+ auto prefix = file + "/";
+ auto i = files.lower_bound(prefix);
+ return i != files.end() && hasPrefix(*i, prefix);
+ }
+
+ return files.count(file);
+ };
+
+ auto storePath = store->addToStore("source", actualUrl, true, htSHA256, filter);
+
+ return {Tree {
+ .actualPath = store->printStorePath(storePath),
+ .storePath = std::move(storePath),
+ }, input};
+ }
+ }
+
+ if (!input->ref) input->ref = "default";
+
+ auto getImmutableAttrs = [&]()
+ {
+ return Attrs({
+ {"type", "hg"},
+ {"name", name},
+ {"rev", input->rev->gitRev()},
+ });
+ };
+
+ auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath)
+ -> std::pair<Tree, std::shared_ptr<const Input>>
+ {
+ assert(input->rev);
+ assert(!rev || rev == input->rev);
+ return {
+ Tree{
+ .actualPath = store->toRealPath(storePath),
+ .storePath = std::move(storePath),
+ .info = TreeInfo {
+ .revCount = getIntAttr(infoAttrs, "revCount"),
+ },
+ },
+ input
+ };
+ };
+
+ if (input->rev) {
+ if (auto res = getCache()->lookup(store, getImmutableAttrs()))
+ return makeResult(res->first, std::move(res->second));
+ }
+
+ assert(input->rev || input->ref);
+ auto revOrRef = input->rev ? input->rev->gitRev() : *input->ref;
+
+ Attrs mutableAttrs({
+ {"type", "hg"},
+ {"name", name},
+ {"url", actualUrl},
+ {"ref", *input->ref},
+ });
+
+ if (auto res = getCache()->lookup(store, mutableAttrs)) {
+ auto rev2 = Hash(getStrAttr(res->first, "rev"), htSHA1);
+ if (!rev || rev == rev2) {
+ input->rev = rev2;
+ return makeResult(res->first, std::move(res->second));
+ }
+ }
+
+ Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), hashString(htSHA256, actualUrl).to_string(Base32, false));
+
+ /* If this is a commit hash that we already have, we don't
+ have to pull again. */
+ if (!(input->rev
+ && pathExists(cacheDir)
+ && runProgram(
+ RunOptions("hg", { "log", "-R", cacheDir, "-r", input->rev->gitRev(), "--template", "1" })
+ .killStderr(true)).second == "1"))
+ {
+ Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Mercurial repository '%s'", actualUrl));
+
+ if (pathExists(cacheDir)) {
+ try {
+ runProgram("hg", true, { "pull", "-R", cacheDir, "--", actualUrl });
+ }
+ catch (ExecError & e) {
+ string transJournal = cacheDir + "/.hg/store/journal";
+ /* hg throws "abandoned transaction" error only if this file exists */
+ if (pathExists(transJournal)) {
+ runProgram("hg", true, { "recover", "-R", cacheDir });
+ runProgram("hg", true, { "pull", "-R", cacheDir, "--", actualUrl });
+ } else {
+ throw ExecError(e.status, fmt("'hg pull' %s", statusToString(e.status)));
+ }
+ }
+ } else {
+ createDirs(dirOf(cacheDir));
+ runProgram("hg", true, { "clone", "--noupdate", "--", actualUrl, cacheDir });
+ }
+ }
+
+ auto tokens = tokenizeString<std::vector<std::string>>(
+ runProgram("hg", true, { "log", "-R", cacheDir, "-r", revOrRef, "--template", "{node} {rev} {branch}" }));
+ assert(tokens.size() == 3);
+
+ input->rev = Hash(tokens[0], htSHA1);
+ auto revCount = std::stoull(tokens[1]);
+ input->ref = tokens[2];
+
+ if (auto res = getCache()->lookup(store, getImmutableAttrs()))
+ return makeResult(res->first, std::move(res->second));
+
+ Path tmpDir = createTempDir();
+ AutoDelete delTmpDir(tmpDir, true);
+
+ runProgram("hg", true, { "archive", "-R", cacheDir, "-r", input->rev->gitRev(), tmpDir });
+
+ deletePath(tmpDir + "/.hg_archival.txt");
+
+ auto storePath = store->addToStore(name, tmpDir);
+
+ Attrs infoAttrs({
+ {"rev", input->rev->gitRev()},
+ {"revCount", (int64_t) revCount},
+ });
+
+ if (!this->rev)
+ getCache()->add(
+ store,
+ mutableAttrs,
+ infoAttrs,
+ storePath,
+ false);
+
+ getCache()->add(
+ store,
+ getImmutableAttrs(),
+ infoAttrs,
+ storePath,
+ true);
+
+ return makeResult(infoAttrs, std::move(storePath));
+ }
+};
+
+struct MercurialInputScheme : InputScheme
+{
+ std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
+ {
+ if (url.scheme != "hg+http" &&
+ url.scheme != "hg+https" &&
+ url.scheme != "hg+ssh" &&
+ url.scheme != "hg+file") return nullptr;
+
+ auto url2(url);
+ url2.scheme = std::string(url2.scheme, 3);
+ url2.query.clear();
+
+ Attrs attrs;
+ attrs.emplace("type", "hg");
+
+ for (auto &[name, value] : url.query) {
+ if (name == "rev" || name == "ref")
+ attrs.emplace(name, value);
+ else
+ url2.query.emplace(name, value);
+ }
+
+ attrs.emplace("url", url2.to_string());
+
+ return inputFromAttrs(attrs);
+ }
+
+ std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
+ {
+ if (maybeGetStrAttr(attrs, "type") != "hg") return {};
+
+ for (auto & [name, value] : attrs)
+ if (name != "type" && name != "url" && name != "ref" && name != "rev")
+ throw Error("unsupported Mercurial input attribute '%s'", name);
+
+ auto input = std::make_unique<MercurialInput>(parseURL(getStrAttr(attrs, "url")));
+ if (auto ref = maybeGetStrAttr(attrs, "ref")) {
+ if (!std::regex_match(*ref, refRegex))
+ throw BadURL("invalid Mercurial branch/tag name '%s'", *ref);
+ input->ref = *ref;
+ }
+ if (auto rev = maybeGetStrAttr(attrs, "rev"))
+ input->rev = Hash(*rev, htSHA1);
+ return input;
+ }
+};
+
+static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<MercurialInputScheme>()); });
+
+}
diff --git a/src/libfetchers/tarball.cc b/src/libfetchers/tarball.cc
new file mode 100644
index 000000000..b0a83001e
--- /dev/null
+++ b/src/libfetchers/tarball.cc
@@ -0,0 +1,277 @@
+#include "fetchers.hh"
+#include "cache.hh"
+#include "download.hh"
+#include "globals.hh"
+#include "store-api.hh"
+#include "archive.hh"
+#include "tarfile.hh"
+
+namespace nix::fetchers {
+
+DownloadFileResult downloadFile(
+ ref<Store> store,
+ const std::string & url,
+ const std::string & name,
+ bool immutable)
+{
+ // FIXME: check store
+
+ Attrs inAttrs({
+ {"type", "file"},
+ {"url", url},
+ {"name", name},
+ });
+
+ auto cached = getCache()->lookupExpired(store, inAttrs);
+
+ auto useCached = [&]() -> DownloadFileResult
+ {
+ return {
+ .storePath = std::move(cached->storePath),
+ .etag = getStrAttr(cached->infoAttrs, "etag"),
+ .effectiveUrl = getStrAttr(cached->infoAttrs, "url")
+ };
+ };
+
+ if (cached && !cached->expired)
+ return useCached();
+
+ DownloadRequest request(url);
+ if (cached)
+ request.expectedETag = getStrAttr(cached->infoAttrs, "etag");
+ DownloadResult res;
+ try {
+ res = getDownloader()->download(request);
+ } catch (DownloadError & e) {
+ if (cached) {
+ warn("%s; using cached version", e.msg());
+ return useCached();
+ } else
+ throw;
+ }
+
+ // FIXME: write to temporary file.
+
+ Attrs infoAttrs({
+ {"etag", res.etag},
+ {"url", res.effectiveUri},
+ });
+
+ std::optional<StorePath> storePath;
+
+ if (res.cached) {
+ assert(cached);
+ assert(request.expectedETag == res.etag);
+ storePath = std::move(cached->storePath);
+ } else {
+ StringSink sink;
+ dumpString(*res.data, sink);
+ auto hash = hashString(htSHA256, *res.data);
+ ValidPathInfo info(store->makeFixedOutputPath(false, hash, name));
+ info.narHash = hashString(htSHA256, *sink.s);
+ info.narSize = sink.s->size();
+ info.ca = makeFixedOutputCA(false, hash);
+ store->addToStore(info, sink.s, NoRepair, NoCheckSigs);
+ storePath = std::move(info.path);
+ }
+
+ getCache()->add(
+ store,
+ inAttrs,
+ infoAttrs,
+ *storePath,
+ immutable);
+
+ if (url != res.effectiveUri)
+ getCache()->add(
+ store,
+ {
+ {"type", "file"},
+ {"url", res.effectiveUri},
+ {"name", name},
+ },
+ infoAttrs,
+ *storePath,
+ immutable);
+
+ return {
+ .storePath = std::move(*storePath),
+ .etag = res.etag,
+ .effectiveUrl = res.effectiveUri,
+ };
+}
+
+Tree downloadTarball(
+ ref<Store> store,
+ const std::string & url,
+ const std::string & name,
+ bool immutable)
+{
+ Attrs inAttrs({
+ {"type", "tarball"},
+ {"url", url},
+ {"name", name},
+ });
+
+ auto cached = getCache()->lookupExpired(store, inAttrs);
+
+ if (cached && !cached->expired)
+ return Tree {
+ .actualPath = store->toRealPath(cached->storePath),
+ .storePath = std::move(cached->storePath),
+ .info = TreeInfo {
+ .lastModified = getIntAttr(cached->infoAttrs, "lastModified"),
+ },
+ };
+
+ auto res = downloadFile(store, url, name, immutable);
+
+ std::optional<StorePath> unpackedStorePath;
+ time_t lastModified;
+
+ if (cached && res.etag != "" && getStrAttr(cached->infoAttrs, "etag") == res.etag) {
+ unpackedStorePath = std::move(cached->storePath);
+ lastModified = getIntAttr(cached->infoAttrs, "lastModified");
+ } else {
+ Path tmpDir = createTempDir();
+ AutoDelete autoDelete(tmpDir, true);
+ unpackTarfile(store->toRealPath(res.storePath), tmpDir);
+ auto members = readDirectory(tmpDir);
+ if (members.size() != 1)
+ throw nix::Error("tarball '%s' contains an unexpected number of top-level files", url);
+ auto topDir = tmpDir + "/" + members.begin()->name;
+ lastModified = lstat(topDir).st_mtime;
+ unpackedStorePath = store->addToStore(name, topDir, true, htSHA256, defaultPathFilter, NoRepair);
+ }
+
+ Attrs infoAttrs({
+ {"lastModified", lastModified},
+ {"etag", res.etag},
+ });
+
+ getCache()->add(
+ store,
+ inAttrs,
+ infoAttrs,
+ *unpackedStorePath,
+ immutable);
+
+ return Tree {
+ .actualPath = store->toRealPath(*unpackedStorePath),
+ .storePath = std::move(*unpackedStorePath),
+ .info = TreeInfo {
+ .lastModified = lastModified,
+ },
+ };
+}
+
+struct TarballInput : Input
+{
+ ParsedURL url;
+ std::optional<Hash> hash;
+
+ TarballInput(const ParsedURL & url) : url(url)
+ { }
+
+ std::string type() const override { return "tarball"; }
+
+ bool operator ==(const Input & other) const override
+ {
+ auto other2 = dynamic_cast<const TarballInput *>(&other);
+ return
+ other2
+ && to_string() == other2->to_string()
+ && hash == other2->hash;
+ }
+
+ bool isImmutable() const override
+ {
+ return hash || narHash;
+ }
+
+ ParsedURL toURL() const override
+ {
+ auto url2(url);
+ // NAR hashes are preferred over file hashes since tar/zip files
+ // don't have a canonical representation.
+ if (narHash)
+ url2.query.insert_or_assign("narHash", narHash->to_string(SRI));
+ else if (hash)
+ url2.query.insert_or_assign("hash", hash->to_string(SRI));
+ return url2;
+ }
+
+ Attrs toAttrsInternal() const override
+ {
+ Attrs attrs;
+ attrs.emplace("url", url.to_string());
+ if (narHash)
+ attrs.emplace("narHash", narHash->to_string(SRI));
+ else if (hash)
+ attrs.emplace("hash", hash->to_string(SRI));
+ return attrs;
+ }
+
+ std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
+ {
+ auto tree = downloadTarball(store, url.to_string(), "source", false);
+
+ auto input = std::make_shared<TarballInput>(*this);
+ input->narHash = store->queryPathInfo(tree.storePath)->narHash;
+
+ return {std::move(tree), input};
+ }
+};
+
+struct TarballInputScheme : InputScheme
+{
+ std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
+ {
+ if (url.scheme != "file" && url.scheme != "http" && url.scheme != "https") return nullptr;
+
+ if (!hasSuffix(url.path, ".zip")
+ && !hasSuffix(url.path, ".tar")
+ && !hasSuffix(url.path, ".tar.gz")
+ && !hasSuffix(url.path, ".tar.xz")
+ && !hasSuffix(url.path, ".tar.bz2"))
+ return nullptr;
+
+ auto input = std::make_unique<TarballInput>(url);
+
+ auto hash = input->url.query.find("hash");
+ if (hash != input->url.query.end()) {
+ // FIXME: require SRI hash.
+ input->hash = Hash(hash->second);
+ input->url.query.erase(hash);
+ }
+
+ auto narHash = input->url.query.find("narHash");
+ if (narHash != input->url.query.end()) {
+ // FIXME: require SRI hash.
+ input->narHash = Hash(narHash->second);
+ input->url.query.erase(narHash);
+ }
+
+ return input;
+ }
+
+ std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
+ {
+ if (maybeGetStrAttr(attrs, "type") != "tarball") return {};
+
+ for (auto & [name, value] : attrs)
+ if (name != "type" && name != "url" && name != "hash" && name != "narHash")
+ throw Error("unsupported tarball input attribute '%s'", name);
+
+ auto input = std::make_unique<TarballInput>(parseURL(getStrAttr(attrs, "url")));
+ if (auto hash = maybeGetStrAttr(attrs, "hash"))
+ // FIXME: require SRI hash.
+ input->hash = Hash(*hash);
+
+ return input;
+ }
+};
+
+static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<TarballInputScheme>()); });
+
+}
diff --git a/src/libfetchers/tree-info.cc b/src/libfetchers/tree-info.cc
new file mode 100644
index 000000000..5788e94a1
--- /dev/null
+++ b/src/libfetchers/tree-info.cc
@@ -0,0 +1,14 @@
+#include "tree-info.hh"
+#include "store-api.hh"
+
+#include <nlohmann/json.hpp>
+
+namespace nix::fetchers {
+
+StorePath TreeInfo::computeStorePath(Store & store) const
+{
+ assert(narHash);
+ return store.makeFixedOutputPath(true, narHash, "source");
+}
+
+}
diff --git a/src/libfetchers/tree-info.hh b/src/libfetchers/tree-info.hh
new file mode 100644
index 000000000..2c7347281
--- /dev/null
+++ b/src/libfetchers/tree-info.hh
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "path.hh"
+#include "hash.hh"
+
+#include <nlohmann/json_fwd.hpp>
+
+namespace nix { class Store; }
+
+namespace nix::fetchers {
+
+struct TreeInfo
+{
+ Hash narHash;
+ std::optional<uint64_t> revCount;
+ std::optional<time_t> lastModified;
+
+ bool operator ==(const TreeInfo & other) const
+ {
+ return
+ narHash == other.narHash
+ && revCount == other.revCount
+ && lastModified == other.lastModified;
+ }
+
+ StorePath computeStorePath(Store & store) const;
+};
+
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 19:38:56 +0000