thodg/libgit2/src/fetch.c

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• Hash : 11678b37
  Author :
  Date : 2012-05-09T16:18:13
  

  fetch: filter tag annotation pseudo-refs while generating wants These objects aren't considered as being advertised, so asking for them will cause the remote end to close the connection. This makes the checking in update_tips() unnecessary, because they don't get inserted in the list.

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• src/fetch.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * 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/remote.h"
  #include "git2/oid.h"
  #include "git2/refs.h"
  #include "git2/revwalk.h"
  #include "git2/indexer.h"
  
  #include "common.h"
  #include "transport.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;
  	git_odb *odb;
  	int found_head;
  };
  
  static int filter_ref__cb(git_remote_head *head, void *payload)
  {
  	struct filter_payload *p = payload;
  
  	if (!p->found_head && strcmp(head->name, GIT_HEAD_FILE) == 0) {
  		p->found_head = 1;
  	} else {
  		/* If it doesn't match the refpec, we don't want it */
  		if (!git_refspec_src_matches(p->spec, head->name))
  			return 0;
  
  		/* Don't even try to ask for the annotation target */
  		if (!git__suffixcmp(head->name, "^{}"))
  			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_vector_clear(&remote->refs);
  
  	/*
  	 * 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.spec = git_remote_fetchspec(remote);
  	p.found_head = 0;
  	p.remote = remote;
  
  	if (git_repository_odb__weakptr(&p.odb, remote->repo) < 0)
  		return -1;
  
  	return remote->transport->ls(remote->transport, &filter_ref__cb, &p);
  }
  
  /*
   * 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, &remote->refs);
  }
  
  int git_fetch_download_pack(git_remote *remote, git_off_t *bytes, git_indexer_stats *stats)
  {
  	if(!remote->need_pack)
  		return 0;
  
  	return remote->transport->download_pack(remote->transport, remote->repo, bytes, stats);
  }
  
  /* Receiving data from a socket and storing it is pretty much the same for git and HTTP */
  int git_fetch__download_pack(
  	const char *buffered,
  	size_t buffered_size,
  	GIT_SOCKET fd,
  	git_repository *repo,
  	git_off_t *bytes,
  	git_indexer_stats *stats)
  {
  	int recvd;
  	char buff[1024];
  	gitno_buffer buf;
  	git_indexer_stream *idx;
  
  	gitno_buffer_setup(&buf, buff, sizeof(buff), fd);
  
  	if (memcmp(buffered, "PACK", strlen("PACK"))) {
  		giterr_set(GITERR_NET, "The pack doesn't start with the signature");
  		return -1;
  	}
  
  	if (git_indexer_stream_new(&idx, git_repository_path(repo)) < 0)
  		return -1;
  
  	memset(stats, 0, sizeof(git_indexer_stats));
  	if (git_indexer_stream_add(idx, buffered, buffered_size, stats) < 0)
  		goto on_error;
  
  	*bytes = buffered_size;
  
  	do {
  		if (git_indexer_stream_add(idx, buf.data, buf.offset, stats) < 0)
  			goto on_error;
  
  		gitno_consume_n(&buf, buf.offset);
  		if ((recvd = gitno_recv(&buf)) < 0)
  			goto on_error;
  
  		*bytes += recvd;
  	} while(recvd > 0);
  
  	if (git_indexer_stream_finalize(idx, stats))
  		goto on_error;
  
  	git_indexer_stream_free(idx);
  	return 0;
  
  on_error:
  	git_indexer_stream_free(idx);
  	return -1;
  }
  
  int git_fetch_setup_walk(git_revwalk **out, git_repository *repo)
  {
  	git_revwalk *walk;
  	git_strarray refs;
  	unsigned int i;
  	git_reference *ref;
  
  	if (git_reference_listall(&refs, repo, GIT_REF_LISTALL) < 0)
  		return -1;
  
  	if (git_revwalk_new(&walk, repo) < 0)
  		return -1;
  
  	git_revwalk_sorting(walk, GIT_SORT_TIME);
  
  	for (i = 0; i < refs.count; ++i) {
  		/* No tags */
  		if (!git__prefixcmp(refs.strings[i], GIT_REFS_TAGS_DIR))
  			continue;
  
  		if (git_reference_lookup(&ref, repo, refs.strings[i]) < 0)
  			goto on_error;
  
  		if (git_reference_type(ref) == GIT_REF_SYMBOLIC)
  			continue;
  		if (git_revwalk_push(walk, git_reference_oid(ref)) < 0)
  			goto on_error;
  
  		git_reference_free(ref);
  	}
  
  	git_strarray_free(&refs);
  	*out = walk;
  	return 0;
  
  on_error:
  	git_reference_free(ref);
  	git_strarray_free(&refs);
  	return -1;
  }
  

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