thodg/libgit2/examples/network/fetch.c

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• Hash : 7562422a
  Author :
  Date : 2019-01-24T10:30:58
  

  examples: merge common network code
  
  Right now, we have two sets of "common" code, one containing
  general common code and one containing network common code. As we
  intend to get rid of the network subdirectory and instead merge
  all examples into a single standalone executable, this
  distinction doesn't make a lot of sense now. Furthermore, the
  common network code is not that big.
  
  Let's get rid of the common network code by merging it into the
  general common code.
  

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• examples/network/fetch.c

• #include "../common.h"
  
  static int progress_cb(const char *str, int len, void *data)
  {
  	(void)data;
  	printf("remote: %.*s", len, str);
  	fflush(stdout); /* We don't have the \n to force the flush */
  	return 0;
  }
  
  /**
   * This function gets called for each remote-tracking branch that gets
   * updated. The message we output depends on whether it's a new one or
   * an update.
   */
  static int update_cb(const char *refname, const git_oid *a, const git_oid *b, void *data)
  {
  	char a_str[GIT_OID_HEXSZ+1], b_str[GIT_OID_HEXSZ+1];
  	(void)data;
  
  	git_oid_fmt(b_str, b);
  	b_str[GIT_OID_HEXSZ] = '\0';
  
  	if (git_oid_iszero(a)) {
  		printf("[new]     %.20s %s\n", b_str, refname);
  	} else {
  		git_oid_fmt(a_str, a);
  		a_str[GIT_OID_HEXSZ] = '\0';
  		printf("[updated] %.10s..%.10s %s\n", a_str, b_str, refname);
  	}
  
  	return 0;
  }
  
  /**
   * This gets called during the download and indexing. Here we show
   * processed and total objects in the pack and the amount of received
   * data. Most frontends will probably want to show a percentage and
   * the download rate.
   */
  static int transfer_progress_cb(const git_transfer_progress *stats, void *payload)
  {
  	(void)payload;
  
  	if (stats->received_objects == stats->total_objects) {
  		printf("Resolving deltas %d/%d\r",
  		       stats->indexed_deltas, stats->total_deltas);
  	} else if (stats->total_objects > 0) {
  		printf("Received %d/%d objects (%d) in %" PRIuZ " bytes\r",
  		       stats->received_objects, stats->total_objects,
  		       stats->indexed_objects, stats->received_bytes);
  	}
  	return 0;
  }
  
  /** Entry point for this command */
  int fetch(git_repository *repo, int argc, char **argv)
  {
  	git_remote *remote = NULL;
  	const git_transfer_progress *stats;
  	git_fetch_options fetch_opts = GIT_FETCH_OPTIONS_INIT;
  
  	if (argc < 2) {
  		fprintf(stderr, "usage: %s fetch <repo>\n", argv[-1]);
  		return EXIT_FAILURE;
  	}
  
  	/* Figure out whether it's a named remote or a URL */
  	printf("Fetching %s for repo %p\n", argv[1], repo);
  	if (git_remote_lookup(&remote, repo, argv[1]) < 0)
  		if (git_remote_create_anonymous(&remote, repo, argv[1]) < 0)
  			goto on_error;
  
  	/* Set up the callbacks (only update_tips for now) */
  	fetch_opts.callbacks.update_tips = &update_cb;
  	fetch_opts.callbacks.sideband_progress = &progress_cb;
  	fetch_opts.callbacks.transfer_progress = transfer_progress_cb;
  	fetch_opts.callbacks.credentials = cred_acquire_cb;
  
  	/**
  	 * Perform the fetch with the configured refspecs from the
  	 * config. Update the reflog for the updated references with
  	 * "fetch".
  	 */
  	if (git_remote_fetch(remote, NULL, &fetch_opts, "fetch") < 0)
  		goto on_error;
  
  	/**
  	 * If there are local objects (we got a thin pack), then tell
  	 * the user how many objects we saved from having to cross the
  	 * network.
  	 */
  	stats = git_remote_stats(remote);
  	if (stats->local_objects > 0) {
  		printf("\rReceived %d/%d objects in %" PRIuZ " bytes (used %d local objects)\n",
  		       stats->indexed_objects, stats->total_objects, stats->received_bytes, stats->local_objects);
  	} else{
  		printf("\rReceived %d/%d objects in %" PRIuZ "bytes\n",
  			stats->indexed_objects, stats->total_objects, stats->received_bytes);
  	}
  
  	git_remote_free(remote);
  
  	return 0;
  
   on_error:
  	git_remote_free(remote);
  	return -1;
  }
  

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