thodg/libgit2/src/fetch.c

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• Hash : 114f5a6c
  Author :
  Date : 2013-06-10T10:10:39
  

  Reorganize diff and add basic diff driver This is a significant reorganization of the diff code to break it into a set of more clearly distinct files and to document the new organization. Hopefully this will make the diff code easier to understand and to extend. This adds a new `git_diff_driver` object that looks of diff driver information from the attributes and the config so that things like function content in diff headers can be provided. The full driver spec is not implemented in the commit - this is focused on the reorganization of the code and putting the driver hooks in place. This also removes a few #includes from src/repository.h that were overbroad, but as a result required extra #includes in a variety of places since including src/repository.h no longer results in pulling in the whole world.

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• src/fetch.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "git2/oid.h"
  #include "git2/refs.h"
  #include "git2/revwalk.h"
  #include "git2/transport.h"
  
  #include "common.h"
  #include "remote.h"
  #include "refspec.h"
  #include "pack.h"
  #include "fetch.h"
  #include "netops.h"
  #include "repository.h"
  #include "refs.h"
  
  struct filter_payload {
  	git_remote *remote;
  	const git_refspec *spec, *tagspec;
  	git_odb *odb;
  	int found_head;
  };
  
  static int filter_ref__cb(git_remote_head *head, void *payload)
  {
  	struct filter_payload *p = payload;
  	int match = 0;
  
  	if (!git_reference_is_valid_name(head->name))
  		return 0;
  
  	if (!p->found_head && strcmp(head->name, GIT_HEAD_FILE) == 0)
  		p->found_head = 1;
  	else if (p->remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {
  		/*
  		 * If tagopt is --tags, then we only use the default
  		 * tags refspec and ignore the remote's
  		 */
  		if (git_refspec_src_matches(p->tagspec, head->name))
  			match = 1;
  		else
  			return 0;
  	} else if (git_remote__matching_refspec(p->remote, head->name))
  			match = 1;
  
  	if (!match)
  		return 0;
  
  	/* If we have the object, mark it so we don't ask for it */
  	if (git_odb_exists(p->odb, &head->oid))
  		head->local = 1;
  	else
  		p->remote->need_pack = 1;
  
  	return git_vector_insert(&p->remote->refs, head);
  }
  
  static int filter_wants(git_remote *remote)
  {
  	struct filter_payload p;
  	git_refspec tagspec;
  	int error = -1;
  
  	git_vector_clear(&remote->refs);
  	if (git_refspec__parse(&tagspec, GIT_REFSPEC_TAGS, true) < 0)
  		return error;
  
  	/*
  	 * The fetch refspec can be NULL, and what this means is that the
  	 * user didn't specify one. This is fine, as it means that we're
  	 * not interested in any particular branch but just the remote's
  	 * HEAD, which will be stored in FETCH_HEAD after the fetch.
  	 */
  	p.tagspec = &tagspec;
  	p.found_head = 0;
  	p.remote = remote;
  
  	if (git_repository_odb__weakptr(&p.odb, remote->repo) < 0)
  		goto cleanup;
  
  	error = git_remote_ls(remote, filter_ref__cb, &p);
  
  cleanup:
  	git_refspec__free(&tagspec);
  
  	return error;
  }
  
  /*
   * In this first version, we push all our refs in and start sending
   * them out. When we get an ACK we hide that commit and continue
   * traversing until we're done
   */
  int git_fetch_negotiate(git_remote *remote)
  {
  	git_transport *t = remote->transport;
  	
  	if (filter_wants(remote) < 0) {
  		giterr_set(GITERR_NET, "Failed to filter the reference list for wants");
  		return -1;
  	}
  
  	/* Don't try to negotiate when we don't want anything */
  	if (remote->refs.length == 0 || !remote->need_pack)
  		return 0;
  
  	/*
  	 * Now we have everything set up so we can start tell the
  	 * server what we want and what we have.
  	 */
  	return t->negotiate_fetch(t,
  		remote->repo,
  		(const git_remote_head * const *)remote->refs.contents,
  		remote->refs.length);
  }
  
  int git_fetch_download_pack(
  	git_remote *remote,
  	git_transfer_progress_callback progress_cb,
  	void *progress_payload)
  {
  	git_transport *t = remote->transport;
  
  	if(!remote->need_pack)
  		return 0;
  
  	return t->download_pack(t, remote->repo, &remote->stats, progress_cb, progress_payload);
  }
  

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