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#include "cache.h"
#include "diff.h"
#include "diffcore.h"
#include "lockfile.h"
#include "commit.h"
#include "run-command.h"
#include "resolve-undo.h"
#include "tree-walk.h"
#include "unpack-trees.h"
#include "dir.h"
static const char *merge_argument(struct commit *commit)
return oid_to_hex(commit ? &commit->object.oid : the_hash_algo->empty_tree);
int try_merge_command(struct repository *r,
const char *strategy, size_t xopts_nr,
const char **xopts, struct commit_list *common,
const char *head_arg, struct commit_list *remotes)
struct strvec args = STRVEC_INIT;
int i, ret;
struct commit_list *j;
strvec_pushf(&args, "merge-%s", strategy);
for (i = 0; i < xopts_nr; i++)
strvec_pushf(&args, "--%s", xopts[i]);
for (j = common; j; j = j->next)
strvec_push(&args, merge_argument(j->item));
strvec_push(&args, "--");
strvec_push(&args, head_arg);
for (j = remotes; j; j = j->next)
strvec_push(&args, merge_argument(j->item));
ret = run_command_v_opt(args.v, RUN_GIT_CMD);
if (repo_read_index(r) < 0)
die(_("failed to read the cache"));
return ret;
int checkout_fast_forward(struct repository *r,
const struct object_id *head,
const struct object_id *remote,
int overwrite_ignore)
struct tree *trees[MAX_UNPACK_TREES];
struct unpack_trees_options opts;
struct tree_desc t[MAX_UNPACK_TREES];
int i, nr_trees = 0;
struct lock_file lock_file = LOCK_INIT;
refresh_index(r->index, REFRESH_QUIET, NULL, NULL, NULL);
if (repo_hold_locked_index(r, &lock_file, LOCK_REPORT_ON_ERROR) < 0)
return -1;
memset(&trees, 0, sizeof(trees));
memset(&t, 0, sizeof(t));
trees[nr_trees] = parse_tree_indirect(head);
if (!trees[nr_trees++]) {
return -1;
trees[nr_trees] = parse_tree_indirect(remote);
if (!trees[nr_trees++]) {
return -1;
for (i = 0; i < nr_trees; i++) {
init_tree_desc(t+i, trees[i]->buffer, trees[i]->size);
memset(&opts, 0, sizeof(opts));
opts.preserve_ignored = !overwrite_ignore;
opts.head_idx = 1;
opts.src_index = r->index;
opts.dst_index = r->index;
opts.update = 1;
opts.verbose_update = 1;
opts.merge = 1;
opts.fn = twoway_merge;
init_checkout_metadata(&opts.meta, NULL, remote, NULL);
setup_unpack_trees_porcelain(&opts, "merge");
if (unpack_trees(nr_trees, t, &opts)) {
return -1;
if (write_locked_index(r->index, &lock_file, COMMIT_LOCK))
return error(_("unable to write new index file"));
return 0;