libgit2 push error demo

demo.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "git2/errors.h"
#include "git2/global.h"
#include "git2/remote.h"
#include "git2/repository.h"
#include "git2/strarray.h"

void git_die(const char *msg) {
  const git_error *const err = git_error_last();
  fprintf(stderr, "%s: %s\n", msg, err->message);
  exit(1);
}

#define GIT_TRY(fn, ...)                                                       \
  do {                                                                         \
    if (fn(__VA_ARGS__) != 0) {                                                \
      git_die(#fn);                                                            \
    }                                                                          \
  } while (0)

int negotiate_push(const git_push_update **updates, size_t len, void *payload);

int main(int argc, char **argv) {
  if (argc < 2) {
    fprintf(stderr, "usage: %s REPOSITORY\n", argv[0]);
    return 1;
  }

  git_libgit2_init();

  const char *const repository_path = argv[1];
  git_repository *repo = NULL;

  GIT_TRY(git_repository_open, &repo, repository_path);

  char *refspec = "+refs/heads/main:refs/heads/main";
  git_strarray refspecs = {
      .count = 1,
      .strings = &refspec,
  };

  git_remote *remote;
  GIT_TRY(git_remote_lookup, &remote, repo, "origin");

  git_push_options push_options = GIT_PUSH_OPTIONS_INIT;
  push_options.callbacks.push_negotiation = negotiate_push;
  push_options.callbacks.payload = NULL;

  GIT_TRY(git_remote_push, remote, &refspecs, &push_options);

  git_remote_free(remote);
  git_repository_free(repo);
  return 0;
}

int negotiate_push(const git_push_update **updates, size_t len, void *payload) {
  return -1;
}

Error:

git_remote_push: config value 'pack.windowMemory' was not found