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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 "filebuf.h"
#include "merge.h"
#include "git2/types.h"
#include "git2/merge.h"
#include "git2/revert.h"
#include "git2/commit.h"
#include "git2/sys/commit.h"
#define GIT_REVERT_FILE_MODE 0666
static int write_revert_head(
git_repository *repo,
const git_commit *commit,
const char *commit_oidstr)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
int error = 0;
assert(repo && commit);
if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_REVERT_HEAD_FILE)) >= 0 &&
(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE, GIT_REVERT_FILE_MODE)) >= 0 &&
(error = git_filebuf_printf(&file, "%s\n", commit_oidstr)) >= 0)
error = git_filebuf_commit(&file);
if (error < 0)
git_filebuf_cleanup(&file);
git_buf_free(&file_path);
return error;
}
static int write_merge_msg(
git_repository *repo,
const git_commit *commit,
const char *commit_oidstr,
const char *commit_msgline)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
int error = 0;
assert(repo && commit);
if ((error = git_buf_joinpath(&file_path, repo->path_repository, GIT_MERGE_MSG_FILE)) < 0 ||
(error = git_filebuf_open(&file, file_path.ptr, GIT_FILEBUF_FORCE, GIT_REVERT_FILE_MODE)) < 0 ||
(error = git_filebuf_printf(&file, "Revert \"%s\"\n\nThis reverts commit %s.\n",
commit_msgline, commit_oidstr)) < 0)
goto cleanup;
error = git_filebuf_commit(&file);
cleanup:
if (error < 0)
git_filebuf_cleanup(&file);
git_buf_free(&file_path);
return error;
}
static int revert_normalize_opts(
git_repository *repo,
git_revert_opts *opts,
const git_revert_opts *given,
const char *their_label)
{
int error = 0;
unsigned int default_checkout_strategy = GIT_CHECKOUT_SAFE_CREATE |
GIT_CHECKOUT_ALLOW_CONFLICTS;
GIT_UNUSED(repo);
if (given != NULL)
memcpy(opts, given, sizeof(git_revert_opts));
else {
git_revert_opts default_opts = GIT_REVERT_OPTS_INIT;
memcpy(opts, &default_opts, sizeof(git_revert_opts));
}
if (!opts->checkout_opts.checkout_strategy)
opts->checkout_opts.checkout_strategy = default_checkout_strategy;
if (!opts->checkout_opts.our_label)
opts->checkout_opts.our_label = "HEAD";
if (!opts->checkout_opts.their_label)
opts->checkout_opts.their_label = their_label;
return error;
}
static int revert_state_cleanup(git_repository *repo)
{
const char *state_files[] = { GIT_REVERT_HEAD_FILE, GIT_MERGE_MSG_FILE };
return git_repository__cleanup_files(repo, state_files, ARRAY_SIZE(state_files));
}
int git_revert(
git_repository *repo,
git_commit *commit,
const git_revert_opts *given_opts)
{
git_revert_opts opts;
git_commit *parent_commit = NULL;
git_tree *parent_tree = NULL, *our_tree = NULL, *revert_tree = NULL;
git_index *index_new = NULL, *index_repo = NULL;
char commit_oidstr[GIT_OID_HEXSZ + 1];
const char *commit_msg;
git_buf their_label = GIT_BUF_INIT;
int parent = 0;
int error = 0;
assert(repo && commit);
if ((error = git_repository__ensure_not_bare(repo, "revert")) < 0)
return error;
git_oid_fmt(commit_oidstr, git_commit_id(commit));
commit_oidstr[GIT_OID_HEXSZ] = '\0';
if ((commit_msg = git_commit_summary(commit)) == NULL) {
error = -1;
goto on_error;
}
if ((error = git_buf_printf(&their_label, "parent of %.7s... %s", commit_oidstr, commit_msg)) < 0 ||
(error = revert_normalize_opts(repo, &opts, given_opts, git_buf_cstr(&their_label))) < 0 ||
(error = write_revert_head(repo, commit, commit_oidstr)) < 0 ||
(error = write_merge_msg(repo, commit, commit_oidstr, commit_msg)) < 0 ||
(error = git_repository_head_tree(&our_tree, repo)) < 0 ||
(error = git_commit_tree(&revert_tree, commit)) < 0)
goto on_error;
if (git_commit_parentcount(commit) > 1) {
if (!opts.mainline) {
giterr_set(GITERR_REVERT,
"Mainline branch is not specified but %s is a merge commit",
commit_oidstr);
error = -1;
goto on_error;
}
parent = opts.mainline;
} else {
if (opts.mainline) {
giterr_set(GITERR_REVERT,
"Mainline branch was specified but %s is not a merge",
commit_oidstr);
error = -1;
goto on_error;
}
parent = git_commit_parentcount(commit);
}
if (parent &&
((error = git_commit_parent(&parent_commit, commit, (parent - 1))) < 0 ||
(error = git_commit_tree(&parent_tree, parent_commit)) < 0))
goto on_error;
if ((error = git_merge_trees(&index_new, repo, revert_tree, our_tree, parent_tree, &opts.merge_tree_opts)) < 0 ||
(error = git_merge__indexes(repo, index_new)) < 0 ||
(error = git_repository_index(&index_repo, repo)) < 0 ||
(error = git_checkout_index(repo, index_repo, &opts.checkout_opts)) < 0)
goto on_error;
goto done;
on_error:
revert_state_cleanup(repo);
done:
git_index_free(index_new);
git_index_free(index_repo);
git_tree_free(parent_tree);
git_tree_free(our_tree);
git_tree_free(revert_tree);
git_commit_free(parent_commit);
git_buf_free(&their_label);
return error;
}
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