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git2.c

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

#include "common.h"

This part is not strictly libgit2-dependent, but you can use this as a starting point for a git-like tool

 
struct {
  char *name;
  git_cb fn;
} commands[] = {
  {"ls-remote", ls_remote},
  {"fetch", fetch},
  {"clone", do_clone},
  {"index-pack", index_pack},
  { NULL, NULL}
};

static int run_command(git_cb fn, int argc, char **argv)
{
  int error;
  git_repository *repo;

Before running the actual command, create an instance of the local repository and pass it to the function.

 
  error = git_repository_open(&repo, ".git");
  if (error < 0)
    repo = NULL;

Run the command. If something goes wrong, print the error message to stderr

 
  error = fn(repo, argc, argv);
  if (error < 0) {
    if (giterr_last() == NULL)
      fprintf(stderr, "Error without message");
    else
      fprintf(stderr, "Bad news:\n %s\n", giterr_last()->message);
  }

  if(repo)
    git_repository_free(repo);

  return !!error;
}

int main(int argc, char **argv)
{
  int i;

  if (argc < 2) {
    fprintf(stderr, "usage: %s <cmd> [repo]\n", argv[0]);
    exit(EXIT_FAILURE);
  }

  for (i = 0; commands[i].name != NULL; ++i) {
    if (!strcmp(argv[1], commands[i].name))
      return run_command(commands[i].fn, --argc, ++argv);
  }

  fprintf(stderr, "Command not found: %s\n", argv[1]);
  return 1;
}