/*
* 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 "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(
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;
}
