thodg/libgit2/src/reset.c

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• Hash : a0c34c94
  Author :
  Date : 2013-01-20T13:27:28
  

  reset: Introduce git_reset_default()

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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"
  
  #define ERROR_MSG "Cannot perform reset"
  
  static int update_head(git_repository *repo, git_object *commit)
  {
  	int error;
  	git_reference *head = NULL, *target = NULL;
  
  	error = git_repository_head(&head, repo);
  
  	if (error < 0 && error != GIT_EORPHANEDHEAD)
  		return error;
  
  	if (error == GIT_EORPHANEDHEAD) {
  		giterr_clear();
  
  		/*
  		 * TODO: This is a bit weak as this doesn't support chained
  		 * symbolic references. yet.
  		 */
  		if ((error = git_reference_lookup(&head, repo, GIT_HEAD_FILE)) < 0)
  			goto cleanup;
  
  		if ((error = git_reference_create(
  			&target,
  			repo,
  			git_reference_symbolic_target(head),
  			git_object_id(commit), 0)) < 0)
  				goto cleanup;
  	} else {
  		if ((error = git_reference_set_target(head, git_object_id(commit))) < 0)
  			goto cleanup;
  	}
  
  	error = 0;
  
  cleanup:
  	git_reference_free(head);
  	git_reference_free(target);
  	return error;
  }
  
  int git_reset_default(
  	git_repository *repo,
  	git_object *target,
  	git_strarray* pathspecs)
  {
  	git_object *commit = NULL;
  	git_tree *tree = NULL;
  	git_diff_list *diff = NULL;
  	git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
  	size_t i;
  	git_diff_delta *delta;
  	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;
  
  	git_vector_foreach(&diff->deltas, i, delta) {
  		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_list_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 = update_head(repo, 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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