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/*
* 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 "repository.h"
#include "merge_file.h"
#include "git2/repository.h"
#include "git2/object.h"
#include "git2/index.h"
#include "xdiff/xdiff.h"
#define GIT_MERGE_FILE_SIDE_EXISTS(X) ((X)->mode != 0)
GIT_INLINE(const char *) merge_file_best_path(
const git_merge_file_input *ancestor,
const git_merge_file_input *ours,
const git_merge_file_input *theirs)
{
if (!GIT_MERGE_FILE_SIDE_EXISTS(ancestor)) {
if (strcmp(ours->path, theirs->path) == 0)
return ours->path;
return NULL;
}
if (strcmp(ancestor->path, ours->path) == 0)
return theirs->path;
else if(strcmp(ancestor->path, theirs->path) == 0)
return ours->path;
return NULL;
}
GIT_INLINE(int) merge_file_best_mode(
const git_merge_file_input *ancestor,
const git_merge_file_input *ours,
const git_merge_file_input *theirs)
{
/*
* If ancestor didn't exist and either ours or theirs is executable,
* assume executable. Otherwise, if any mode changed from the ancestor,
* use that one.
*/
if (!GIT_MERGE_FILE_SIDE_EXISTS(ancestor)) {
if (ours->mode == GIT_FILEMODE_BLOB_EXECUTABLE ||
theirs->mode == GIT_FILEMODE_BLOB_EXECUTABLE)
return GIT_FILEMODE_BLOB_EXECUTABLE;
return GIT_FILEMODE_BLOB;
}
if (ancestor->mode == ours->mode)
return theirs->mode;
else if(ancestor->mode == theirs->mode)
return ours->mode;
return 0;
}
int git_merge_file_input_from_index_entry(
git_merge_file_input *input,
git_repository *repo,
const git_index_entry *entry)
{
git_odb *odb = NULL;
int error = 0;
assert(input && repo && entry);
if (entry->mode == 0)
return 0;
if ((error = git_repository_odb(&odb, repo)) < 0 ||
(error = git_odb_read(&input->odb_object, odb, &entry->oid)) < 0)
goto done;
input->mode = entry->mode;
input->path = git__strdup(entry->path);
input->mmfile.size = git_odb_object_size(input->odb_object);
input->mmfile.ptr = (char *)git_odb_object_data(input->odb_object);
if (input->label == NULL)
input->label = entry->path;
done:
git_odb_free(odb);
return error;
}
int git_merge_file_input_from_diff_file(
git_merge_file_input *input,
git_repository *repo,
const git_diff_file *file)
{
git_odb *odb = NULL;
int error = 0;
assert(input && repo && file);
if (file->mode == 0)
return 0;
if ((error = git_repository_odb(&odb, repo)) < 0 ||
(error = git_odb_read(&input->odb_object, odb, &file->oid)) < 0)
goto done;
input->mode = file->mode;
input->path = git__strdup(file->path);
input->mmfile.size = git_odb_object_size(input->odb_object);
input->mmfile.ptr = (char *)git_odb_object_data(input->odb_object);
if (input->label == NULL)
input->label = file->path;
done:
git_odb_free(odb);
return error;
}
int git_merge_files(
git_merge_file_result *out,
git_merge_file_input *ancestor,
git_merge_file_input *ours,
git_merge_file_input *theirs,
git_merge_automerge_flags flags)
{
xmparam_t xmparam;
mmbuffer_t mmbuffer;
int xdl_result;
int error = 0;
assert(out && ancestor && ours && theirs);
memset(out, 0x0, sizeof(git_merge_file_result));
if (!GIT_MERGE_FILE_SIDE_EXISTS(ours) || !GIT_MERGE_FILE_SIDE_EXISTS(theirs))
return 0;
memset(&xmparam, 0x0, sizeof(xmparam_t));
xmparam.ancestor = ancestor->label;
xmparam.file1 = ours->label;
xmparam.file2 = theirs->label;
out->path = merge_file_best_path(ancestor, ours, theirs);
out->mode = merge_file_best_mode(ancestor, ours, theirs);
if (flags == GIT_MERGE_AUTOMERGE_FAVOR_OURS)
xmparam.favor = XDL_MERGE_FAVOR_OURS;
if (flags == GIT_MERGE_AUTOMERGE_FAVOR_THEIRS)
xmparam.favor = XDL_MERGE_FAVOR_THEIRS;
if ((xdl_result = xdl_merge(&ancestor->mmfile, &ours->mmfile,
&theirs->mmfile, &xmparam, &mmbuffer)) < 0) {
giterr_set(GITERR_MERGE, "Failed to merge files.");
error = -1;
goto done;
}
out->automergeable = (xdl_result == 0);
out->data = (unsigned char *)mmbuffer.ptr;
out->len = mmbuffer.size;
done:
return error;
}
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