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ls-remote.c

#include <git2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "common.h"

static int show_ref__cb(git_remote_head *head, void *payload)
{
  char oid[GIT_OID_HEXSZ + 1] = {0};

  (void)payload;
  git_oid_fmt(oid, &head->oid);
  printf("%s\t%s\n", oid, head->name);
  return 0;
}

static int use_unnamed(git_repository *repo, const char *url)
{
  git_remote *remote = NULL;
  int error;

Create an instance of a remote from the URL. The transport to use is detected from the URL

  error = git_remote_create_inmemory(&remote, repo, NULL, url);
  if (error < 0)
    goto cleanup;

When connecting, the underlying code needs to know wether we want to push or fetch

  error = git_remote_connect(remote, GIT_DIRECTION_FETCH);
  if (error < 0)
    goto cleanup;

With gitremotels we can retrieve the advertised heads

  error = git_remote_ls(remote, &show_ref__cb, NULL);

cleanup:
  git_remote_free(remote);
  return error;
}

static int use_remote(git_repository *repo, char *name)
{
  git_remote *remote = NULL;
  int error;

Find the remote by name

  error = git_remote_load(&remote, repo, name);
  if (error < 0)
    goto cleanup;

  error = git_remote_connect(remote, GIT_DIRECTION_FETCH);
  if (error < 0)
    goto cleanup;

  error = git_remote_ls(remote, &show_ref__cb, NULL);

cleanup:
  git_remote_free(remote);
  return error;
}

This gets called to do the work. The remote can be given either as the name of a configured remote or an URL.

int ls_remote(git_repository *repo, int argc, char **argv)
{
  int error;

  if (argc < 2) {
    fprintf(stderr, "usage: %s ls-remote <remote>\n", argv[-1]);
    return EXIT_FAILURE;
  }

  /* If there's a ':' in the name, assume it's an URL */
  if (strchr(argv[1], ':') != NULL) {
    error = use_unnamed(repo, argv[1]);
  } else {
    error = use_remote(repo, argv[1]);
  }

  return error;
}