thodg/libgit2/src/reset.c

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• Hash : 10672e3e
  Author :
  Date : 2013-10-15T15:10:07
  

  Diff API cleanup This lays groundwork for separating formatting options from diff creation options. This groups the formatting flags separately from the diff list creation flags and reorders the options. This also tweaks some APIs to further separate code that uses patches from code that just looks at git_diffs.

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• src/reset.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 "common.h"
  #include "commit.h"
  #include "tag.h"
  #include "merge.h"
  #include "diff.h"
  #include "git2/reset.h"
  #include "git2/checkout.h"
  #include "git2/merge.h"
  #include "git2/refs.h"
  
  #define ERROR_MSG "Cannot perform reset"
  
  int git_reset_default(
  	git_repository *repo,
  	git_object *target,
  	git_strarray* pathspecs)
  {
  	git_object *commit = NULL;
  	git_tree *tree = NULL;
  	git_diff *diff = NULL;
  	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
  	size_t i, max_i;
  	git_index_entry entry;
  	int error;
  	git_index *index = NULL;
  
  	assert(pathspecs != NULL && pathspecs->count > 0);
  
  	memset(&entry, 0, sizeof(git_index_entry));
  
  	if ((error = git_repository_index(&index, repo)) < 0)
  		goto cleanup;
  
  	if (target) {
  		if (git_object_owner(target) != repo) {
  			giterr_set(GITERR_OBJECT,
  				"%s_default - The given target does not belong to this repository.", ERROR_MSG);
  			return -1;
  		}
  
  		if ((error = git_object_peel(&commit, target, GIT_OBJ_COMMIT)) < 0 ||
  			(error = git_commit_tree(&tree, (git_commit *)commit)) < 0)
  			goto cleanup;
  	}
  
  	opts.pathspec = *pathspecs;
  	opts.flags = GIT_DIFF_REVERSE;
  
  	if ((error = git_diff_tree_to_index(
  		&diff, repo, tree, index, &opts)) < 0)
  			goto cleanup;
  
  	for (i = 0, max_i = git_diff_num_deltas(diff); i < max_i; ++i) {
  		const git_diff_delta *delta = git_diff_get_delta(diff, i);
  
  		if ((error = git_index_conflict_remove(index, delta->old_file.path)) < 0)
  			goto cleanup;
  
  		assert(delta->status == GIT_DELTA_ADDED ||
  			delta->status == GIT_DELTA_MODIFIED ||
  			delta->status == GIT_DELTA_DELETED);
  
  		if (delta->status == GIT_DELTA_DELETED) {
  			if ((error = git_index_remove(index, delta->old_file.path, 0)) < 0)
  				goto cleanup;
  		} else {
  			entry.mode = delta->new_file.mode;
  			git_oid_cpy(&entry.oid, &delta->new_file.oid);
  			entry.path = (char *)delta->new_file.path;
  
  			if ((error = git_index_add(index, &entry)) < 0)
  				goto cleanup;
  		}
  	}
  
  	error = git_index_write(index);
  
  cleanup:
  	git_object_free(commit);
  	git_tree_free(tree);
  	git_index_free(index);
  	git_diff_free(diff);
  
  	return error;
  }
  
  int git_reset(
  	git_repository *repo,
  	git_object *target,
  	git_reset_t reset_type)
  {
  	git_object *commit = NULL;
  	git_index *index = NULL;
  	git_tree *tree = NULL;
  	int error = 0;
  	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
  
  	assert(repo && target);
  
  	if (git_object_owner(target) != repo) {
  		giterr_set(GITERR_OBJECT,
  			"%s - The given target does not belong to this repository.", ERROR_MSG);
  		return -1;
  	}
  
  	if (reset_type != GIT_RESET_SOFT &&
  		(error = git_repository__ensure_not_bare(repo,
  			reset_type == GIT_RESET_MIXED ? "reset mixed" : "reset hard")) < 0)
  		return error;
  
  	if ((error = git_object_peel(&commit, target, GIT_OBJ_COMMIT)) < 0 ||
  		(error = git_repository_index(&index, repo)) < 0 ||
  		(error = git_commit_tree(&tree, (git_commit *)commit)) < 0)
  		goto cleanup;
  
  	if (reset_type == GIT_RESET_SOFT &&
  		(git_repository_state(repo) == GIT_REPOSITORY_STATE_MERGE ||
  		 git_index_has_conflicts(index)))
  	{
  		giterr_set(GITERR_OBJECT, "%s (soft) in the middle of a merge.", ERROR_MSG);
  		error = GIT_EUNMERGED;
  		goto cleanup;
  	}
  
  	/* move HEAD to the new target */
  	if ((error = git_reference__update_terminal(repo, GIT_HEAD_FILE,
  		git_object_id(commit))) < 0)
  		goto cleanup;
  
  	if (reset_type == GIT_RESET_HARD) {
  		/* overwrite working directory with HEAD */
  		opts.checkout_strategy = GIT_CHECKOUT_FORCE;
  
  		if ((error = git_checkout_tree(repo, (git_object *)tree, &opts)) < 0)
  			goto cleanup;
  	}
  
  	if (reset_type > GIT_RESET_SOFT) {
  		/* reset index to the target content */
  
  		if ((error = git_index_read_tree(index, tree)) < 0 ||
  			(error = git_index_write(index)) < 0)
  			goto cleanup;
  
  		if ((error = git_repository_merge_cleanup(repo)) < 0) {
  			giterr_set(GITERR_INDEX, "%s - failed to clean up merge data", ERROR_MSG);
  			goto cleanup;
  		}
  	}
  
  cleanup:
  	git_object_free(commit);
  	git_index_free(index);
  	git_tree_free(tree);
  
  	return error;
  }
  

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