thodg/libgit2/src/fetch.c

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• Hash : 4330ab26
  Author :
  Date : 2013-04-20T04:43:28
  

  remote: handle multiple refspecs A remote can have a multitude of refspecs. Up to now our git_remote's have supported a single one for each fetch and push out of simplicity to get something working. Let the remotes and internal code know about multiple remotes and get the tests passing with them. Instead of setting a refspec, the external users can clear all and add refspecs. This should be enough for most uses, though we're still missing a querying function.

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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"
  
  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 (git_remote__matching_refspec(p->remote, head->name))
  			match = 1;
  	else if (p->remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL &&
  		 git_refspec_src_matches(p->tagspec, 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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