add make_new_branch().

src/git.cpp

@@ -19,7 +19,9 @@
 
 #include <cstdint>
 #include <git2/branch.h>
+#include <git2/buffer.h>
 #include <git2/clone.h>
+#include <git2/commit.h>
 #include <git2/errors.h>
 #include <git2/global.h>
 #include <git2/types.h>
@@ -39,17 +41,22 @@ using std::uint64_t;
 
 git_repository *_repo = nullptr;
 
-void clone_repo()
+void check_git_error(int error)
 {
-    int error = git_clone(&_repo, "https://schlomp.space/FediBlock/data.git",
-                          (get_tmpdir() / "repo").c_str(), nullptr);
-    if (error < 0)
+    if (error != 0)
     {
         const git_error *e = git_error_last();
         throw runtime_error{e->message};
     }
 }
 
+void clone_repo()
+{
+    int error = git_clone(&_repo, "https://schlomp.space/FediBlock/data.git",
+                          (get_tmpdir() / "repo").c_str(), nullptr);
+    check_git_error(error);
+}
+
 uint64_t get_last_id()
 {
     constexpr string_view branch_prefix{"from-web-"};
@@ -86,4 +93,23 @@ uint64_t get_last_id()
     return id;
 }
 
+void make_new_branch()
+{
+    git_oid oid_parent;
+    git_commit *commit;
+
+    // Get SHA1 of HEAD.
+    int error{git_reference_name_to_id(&oid_parent, _repo, "HEAD")};
+    check_git_error(error);
+
+    // Translate SHA-1 to git_commit.
+    error = git_commit_lookup(&commit, _repo, &oid_parent);
+    check_git_error(error);
+
+    git_reference *branch;
+    // Create new branch.
+    error = git_branch_create(&branch, _repo, "test", commit, 0);
+    check_git_error(error);
+}
+
 } // namespace FediBlock

src/git.hpp

@@ -24,6 +24,9 @@ namespace FediBlock
 
 using std::uint64_t;
 
+// Throws runtime_error on error.
+void check_git_error(int error);
+
 // Clone the git repo.
 void clone_repo();
 

src/main.cpp

@@ -68,10 +68,11 @@ int main()
 
     clone_repo();
     cout << "Next branch ID: " << get_last_id() + 1 << "\r\n";
+    make_new_branch();
 
     try
     {
-        remove_tmpdir();
+        // remove_tmpdir();
     }
     catch (const exception &e)
     {