thodg/libgit2/src/fetch.c

• Show log

  Commit

• Hash : 29715d40
  Author :
  Date : 2020-10-11T12:50:52
  

  refs: introduce git_reference_name_is_valid Provide a function that can check reference name validity but can also signal when an error occurs. Use the name "name_is_valid", which is more suggestive of checking a given name, rather than "is_valid_name", which suggests that the function checks the validity of the current reference's name.

Download

• 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 "fetch.h"
  
  #include "git2/oid.h"
  #include "git2/refs.h"
  #include "git2/revwalk.h"
  #include "git2/transport.h"
  
  #include "remote.h"
  #include "refspec.h"
  #include "pack.h"
  #include "netops.h"
  #include "repository.h"
  #include "refs.h"
  
  static int maybe_want(git_remote *remote, git_remote_head *head, git_odb *odb, git_refspec *tagspec, git_remote_autotag_option_t tagopt)
  {
  	int match = 0, valid;
  
  	if (git_reference_name_is_valid(&valid, head->name) < 0)
  		return -1;
  
  	if (!valid)
  		return 0;
  
  	if (tagopt == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {
  		/*
  		 * If tagopt is --tags, always request tags
  		 * in addition to the remote's refspecs
  		 */
  		if (git_refspec_src_matches(tagspec, head->name))
  			match = 1;
  	}
  
  	if (!match && git_remote__matching_refspec(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(odb, &head->oid)) {
  		head->local = 1;
  	}
  	else
  		remote->need_pack = 1;
  
  	return git_vector_insert(&remote->refs, head);
  }
  
  static int filter_wants(git_remote *remote, const git_fetch_options *opts)
  {
  	git_remote_head **heads;
  	git_refspec tagspec, head;
  	int error = 0;
  	git_odb *odb;
  	size_t i, heads_len;
  	git_remote_autotag_option_t tagopt = remote->download_tags;
  
  	if (opts && opts->download_tags != GIT_REMOTE_DOWNLOAD_TAGS_UNSPECIFIED)
  		tagopt = opts->download_tags;
  
  	git_vector_clear(&remote->refs);
  	if ((error = 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.
  	 */
  	if (remote->active_refspecs.length == 0) {
  		if ((error = git_refspec__parse(&head, "HEAD", true)) < 0)
  			goto cleanup;
  
  		error = git_refspec__dwim_one(&remote->active_refspecs, &head, &remote->refs);
  		git_refspec__dispose(&head);
  
  		if (error < 0)
  			goto cleanup;
  	}
  
  	if (git_repository_odb__weakptr(&odb, remote->repo) < 0)
  		goto cleanup;
  
  	if (git_remote_ls((const git_remote_head ***)&heads, &heads_len, remote) < 0)
  		goto cleanup;
  
  	for (i = 0; i < heads_len; i++) {
  		if ((error = maybe_want(remote, heads[i], odb, &tagspec, tagopt)) < 0)
  			break;
  	}
  
  cleanup:
  	git_refspec__dispose(&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, const git_fetch_options *opts)
  {
  	git_transport *t = remote->transport;
  
  	remote->need_pack = 0;
  
  	if (filter_wants(remote, opts) < 0) {
  		git_error_set(GIT_ERROR_NET, "failed to filter the reference list for wants");
  		return -1;
  	}
  
  	/* Don't try to negotiate when we don't want anything */
  	if (!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, const git_remote_callbacks *callbacks)
  {
  	git_transport *t = remote->transport;
  	git_indexer_progress_cb progress = NULL;
  	void *payload = NULL;
  
  	if (!remote->need_pack)
  		return 0;
  
  	if (callbacks) {
  		progress = callbacks->transfer_progress;
  		payload  = callbacks->payload;
  	}
  
  	return t->download_pack(t, remote->repo, &remote->stats, progress, payload);
  }
  
  int git_fetch_options_init(git_fetch_options *opts, unsigned int version)
  {
  	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
  		opts, version, git_fetch_options, GIT_FETCH_OPTIONS_INIT);
  	return 0;
  }
  
  #ifndef GIT_DEPRECATE_HARD
  int git_fetch_init_options(git_fetch_options *opts, unsigned int version)
  {
  	return git_fetch_options_init(opts, version);
  }
  #endif
  

Download