Add update_cached_repo().

Create lockfile, pull or clone.

src/git.cpp

@@ -22,11 +22,13 @@
 
 #include <git2.h>
 
+#include <chrono>
 #include <cstdint>
 #include <fstream>
 #include <stdexcept>
 #include <string>
 #include <string_view>
+#include <thread>
 
 #if LIBGIT2_VER_MAJOR == 0
 #    if LIBGIT2_VER_MINOR < 28
@@ -47,6 +49,10 @@ using std::string;
 using std::string_view;
 using std::to_string;
 using std::uint64_t;
+using std::uint8_t;
+using std::this_thread::sleep_for;
+
+using namespace std::chrono_literals;
 
 git_repository *_repo{nullptr};
 constexpr string_view _clone_url{"git@schlomp.space:FediBlock/data.git"};
@@ -212,4 +218,34 @@ string get_branch_name()
     return "web-" + to_string(id);
 }
 
+void update_cached_repo()
+{
+    for (uint8_t counter{0}; counter < 20; ++counter)
+    {
+        if (files::create_lockfile() == files::lock_result::created)
+        {
+            break;
+        }
+        sleep_for(2s);
+    }
+
+    if (!fs::exists(_repo_dir / ".git"))
+    {
+        clone();
+        return;
+    }
+
+    git_remote *remote{nullptr};
+    check(git_repository_open(&_repo, _repo_dir.c_str()));
+    check(git_remote_lookup(&remote, _repo, "origin"));
+
+    check(git_remote_fetch(remote, nullptr, nullptr, nullptr));
+
+    git_checkout_options options = GIT_CHECKOUT_OPTIONS_INIT;
+    options.checkout_strategy = GIT_CHECKOUT_FORCE;
+    check(git_checkout_head(_repo, options));
+
+    git_remote_free(remote);
+}
+
 } // namespace FediBlock::git

src/git.hpp

@@ -75,6 +75,9 @@ void push();
 // Get the name of the branch we use.
 string get_branch_name();
 
+// If cached repo exist, pull. If not, clone.
+void update_cached_repo();
+
 } // namespace FediBlock::git
 
 #endif // FEDIBLOCK_BACKEND_GIT_HPP