thodg/libgit2/src/reset.c

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• Hash : edebceff
  Author :
  Date : 2012-05-01T13:57:45
  

  Add git_reset() Currently supports Soft and Mixed modes.

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• src/reset.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 "common.h"
  #include "commit.h"
  #include "tag.h"
  #include "git2/reset.h"
  
  #define ERROR_MSG "Cannot perform reset"
  
  static int reset_error_invalid(const char *msg)
  {
  	giterr_set(GITERR_INVALID, "%s - %s", ERROR_MSG, msg);
  	return -1;
  }
  
  int git_reset(
  	git_repository *repo,
  	const git_object *target,
  	git_reset_type reset_type)
  {
  	git_otype target_type = GIT_OBJ_BAD;
  	git_object *commit = NULL;
  	git_index *index = NULL;
  	git_tree *tree = NULL;
  	int error = -1;
  
  	assert(repo && target);
  	assert(reset_type == GIT_RESET_SOFT || reset_type == GIT_RESET_MIXED);
  
  	if (git_object_owner(target) != repo)
  		return reset_error_invalid("The given target does not belong to this repository.");
  
  	if (reset_type == GIT_RESET_MIXED && git_repository_is_bare(repo))
  		return reset_error_invalid("Mixed reset is not allowed in a bare repository.");
  
  	target_type = git_object_type(target);
  
  	switch (target_type)
  	{
  	case GIT_OBJ_TAG:
  		if (git_tag_peel(&commit, (git_tag *)target) < 0)
  			goto cleanup;
  
  		if (git_object_type(commit) != GIT_OBJ_COMMIT) {
  			reset_error_invalid("The given target does not resolve to a commit.");
  			goto cleanup;
  		}
  		break;
  
  	case GIT_OBJ_COMMIT:
  		commit = (git_object *)target;
  		break;
  
  	default:
  		return reset_error_invalid("Only git_tag and git_commit objects are valid targets.");
  	}
  
  	//TODO: Check for unmerged entries
  
  	if (git_reference__update(repo, git_object_id(commit), GIT_HEAD_FILE) < 0)
  		goto cleanup;
  
  	if (reset_type == GIT_RESET_SOFT) {
  		error = 0;
  		goto cleanup;
  	}
  
  	if (git_commit_tree(&tree, (git_commit *)commit) < 0) {
  		giterr_set(GITERR_OBJECT, "%s - Failed to retrieve the commit tree.", ERROR_MSG);
  		goto cleanup;
  	}
  
  	if (git_repository_index(&index, repo) < 0) {
  		giterr_set(GITERR_OBJECT, "%s - Failed to retrieve the index.", ERROR_MSG);
  		goto cleanup;
  	}
  
  	if (git_index_read_tree(index, tree) < 0) {
  		giterr_set(GITERR_INDEX, "%s - Failed to update the index.", ERROR_MSG);
  		goto cleanup;
  	}
  
  	if (git_index_write(index) < 0) {
  		giterr_set(GITERR_INDEX, "%s - Failed to write the index.", ERROR_MSG);
  		goto cleanup;
  	}
  
  	error = 0;
  
  cleanup:
  	if (target_type == GIT_OBJ_TAG)
  		git_object_free(commit);
  
  	git_index_free(index);
  	git_tree_free(tree);
  
  	return error;
  }
  

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