thodg/libgit2/src/clone.c

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• Hash : 3aa443a9
  Author :
  Date : 2012-08-20T16:56:45
  

  checkout: introduce git_checkout_tree()

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• src/clone.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 <assert.h>
  
  #include "git2/clone.h"
  #include "git2/remote.h"
  #include "git2/revparse.h"
  #include "git2/branch.h"
  #include "git2/config.h"
  #include "git2/checkout.h"
  #include "git2/commit.h"
  #include "git2/tree.h"
  
  #include "common.h"
  #include "remote.h"
  #include "fileops.h"
  #include "refs.h"
  #include "path.h"
  
  struct HeadInfo {
  	git_repository *repo;
  	git_oid remote_head_oid;
  	git_buf branchname;
  };
  
  static int create_tracking_branch(git_repository *repo, const git_oid *target, const char *name)
  {
  	git_object *head_obj = NULL;
  	git_reference *branch_ref;
  	int retcode = GIT_ERROR;
  
  	/* Find the target commit */
  	if (git_object_lookup(&head_obj, repo, target, GIT_OBJ_ANY) < 0)
  		return GIT_ERROR;
  
  	/* Create the new branch */
  	if (!git_branch_create(&branch_ref, repo, name, head_obj, 0)) {
  		git_config *cfg;
  
  		git_reference_free(branch_ref);
  		/* Set up tracking */
  		if (!git_repository_config(&cfg, repo)) {
  			git_buf remote = GIT_BUF_INIT;
  			git_buf merge = GIT_BUF_INIT;
  			git_buf merge_target = GIT_BUF_INIT;
  			if (!git_buf_printf(&remote, "branch.%s.remote", name) &&
  				 !git_buf_printf(&merge, "branch.%s.merge", name) &&
  				 !git_buf_printf(&merge_target, "refs/heads/%s", name) &&
  				 !git_config_set_string(cfg, git_buf_cstr(&remote), "origin") &&
  				 !git_config_set_string(cfg, git_buf_cstr(&merge), git_buf_cstr(&merge_target))) {
  				retcode = 0;
  			}
  			git_buf_free(&remote);
  			git_buf_free(&merge);
  			git_buf_free(&merge_target);
  			git_config_free(cfg);
  		}
  	}
  
  	git_object_free(head_obj);
  	return retcode;
  }
  
  static int reference_matches_remote_head(const char *head_name, void *payload)
  {
  	struct HeadInfo *head_info = (struct HeadInfo *)payload;
  	git_oid oid;
  
  	/* Stop looking if we've already found a match */
  	if (git_buf_len(&head_info->branchname) > 0) return 0;
  
  	if (!git_reference_name_to_oid(&oid, head_info->repo, head_name) &&
  		 !git_oid_cmp(&head_info->remote_head_oid, &oid)) {
  		git_buf_puts(&head_info->branchname,
  						 head_name+strlen("refs/remotes/origin/"));
  	}
  	return 0;
  }
  
  static int update_head_to_new_branch(git_repository *repo, const git_oid *target, const char *name)
  {
  	int retcode = GIT_ERROR;
  
  	if (!create_tracking_branch(repo, target, name)) {
  		git_reference *head;
  		if (!git_reference_lookup(&head, repo, GIT_HEAD_FILE)) {
  			git_buf targetbuf = GIT_BUF_INIT;
  			if (!git_buf_printf(&targetbuf, "refs/heads/%s", name)) {
  				retcode = git_reference_set_target(head, git_buf_cstr(&targetbuf));
  			}
  			git_buf_free(&targetbuf);
  			git_reference_free(head);
  		}
  	}
  
  	return retcode;
  }
  
  static int update_head_to_remote(git_repository *repo, git_remote *remote)
  {
  	int retcode = GIT_ERROR;
  	git_remote_head *remote_head;
  	git_oid oid;
  	struct HeadInfo head_info;
  
  	/* Get the remote's HEAD. This is always the first ref in remote->refs. */
  	remote_head = remote->refs.contents[0];
  	git_oid_cpy(&head_info.remote_head_oid, &remote_head->oid);
  	git_buf_init(&head_info.branchname, 16);
  	head_info.repo = repo;
  
  	/* Check to see if "master" matches the remote head */
  	if (!git_reference_name_to_oid(&oid, repo, "refs/remotes/origin/master") &&
  		 !git_oid_cmp(&remote_head->oid, &oid)) {
  		retcode = update_head_to_new_branch(repo, &oid, "master");
  	}
  	/* Not master. Check all the other refs. */
  	else if (!git_reference_foreach(repo, GIT_REF_LISTALL,
  												 reference_matches_remote_head,
  												 &head_info) &&
  				git_buf_len(&head_info.branchname) > 0) {
  		retcode = update_head_to_new_branch(repo, &head_info.remote_head_oid,
  														git_buf_cstr(&head_info.branchname));
  	}
  
  	git_buf_free(&head_info.branchname);
  	return retcode;
  }
  
  /*
   * submodules?
   */
  
  
  
  static int setup_remotes_and_fetch(git_repository *repo,
  											  const char *origin_url,
  											  git_indexer_stats *fetch_stats)
  {
  	int retcode = GIT_ERROR;
  	git_remote *origin = NULL;
  	git_off_t bytes = 0;
  	git_indexer_stats dummy_stats;
  
  	if (!fetch_stats) fetch_stats = &dummy_stats;
  
  	/* Create the "origin" remote */
  	if (!git_remote_add(&origin, repo, "origin", origin_url)) {
  		/* Connect and download everything */
  		if (!git_remote_connect(origin, GIT_DIR_FETCH)) {
  			if (!git_remote_download(origin, &bytes, fetch_stats)) {
  				/* Create "origin/foo" branches for all remote branches */
  				if (!git_remote_update_tips(origin)) {
  					/* Point HEAD to the same ref as the remote's head */
  					if (!update_head_to_remote(repo, origin)) {
  						retcode = 0;
  					}
  				}
  			}
  			git_remote_disconnect(origin);
  		}
  		git_remote_free(origin);
  	}
  
  	return retcode;
  }
  
  
  static bool path_is_okay(const char *path)
  {
  	/* The path must either not exist, or be an empty directory */
  	if (!git_path_exists(path)) return true;
  	if (!git_path_is_empty_dir(path)) {
  		giterr_set(GITERR_INVALID,
  					  "'%s' exists and is not an empty directory", path);
  		return false;
  	}
  	return true;
  }
  
  
  static int clone_internal(git_repository **out,
  								  const char *origin_url,
  								  const char *path,
  								  git_indexer_stats *fetch_stats,
  								  int is_bare)
  {
  	int retcode = GIT_ERROR;
  	git_repository *repo = NULL;
  	git_indexer_stats dummy_stats;
  
  	if (!fetch_stats) fetch_stats = &dummy_stats;
  
  	if (!path_is_okay(path)) {
  		return GIT_ERROR;
  	}
  
  	if (!(retcode = git_repository_init(&repo, path, is_bare))) {
  		if ((retcode = setup_remotes_and_fetch(repo, origin_url, fetch_stats)) < 0) {
  			/* Failed to fetch; clean up */
  			git_repository_free(repo);
  			git_futils_rmdir_r(path, GIT_DIRREMOVAL_FILES_AND_DIRS);
  		} else {
  			*out = repo;
  			retcode = 0;
  		}
  	}
  
  	return retcode;
  }
  
  int git_clone_bare(git_repository **out,
  						 const char *origin_url,
  						 const char *dest_path,
  						 git_indexer_stats *fetch_stats)
  {
  	assert(out && origin_url && dest_path);
  	return clone_internal(out, origin_url, dest_path, fetch_stats, 1);
  }
  
  
  int git_clone(git_repository **out,
  				  const char *origin_url,
  				  const char *workdir_path,
  				  git_indexer_stats *fetch_stats,
  				  git_indexer_stats *checkout_stats,
  				  git_checkout_opts *checkout_opts)
  {
  	int retcode = GIT_ERROR;
  
  	assert(out && origin_url && workdir_path);
  
  	if (!(retcode = clone_internal(out, origin_url, workdir_path, fetch_stats, 0)))
  		retcode = git_checkout_head(*out, checkout_opts, checkout_stats);
  
  	return retcode;
  }
  

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