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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 "index.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 char *commit_oidstr)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
int error = 0;
if ((error = git_buf_joinpath(&file_path, repo->gitdir, 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 char *commit_oidstr,
const char *commit_msgline)
{
git_filebuf file = GIT_FILEBUF_INIT;
git_buf file_path = GIT_BUF_INIT;
int error = 0;
if ((error = git_buf_joinpath(&file_path, repo->gitdir, 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_options *opts,
const git_revert_options *given,
const char *their_label)
{
int error = 0;
unsigned int default_checkout_strategy = GIT_CHECKOUT_SAFE |
GIT_CHECKOUT_ALLOW_CONFLICTS;
GIT_UNUSED(repo);
if (given != NULL)
memcpy(opts, given, sizeof(git_revert_options));
else {
git_revert_options default_opts = GIT_REVERT_OPTIONS_INIT;
memcpy(opts, &default_opts, sizeof(git_revert_options));
}
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));
}
static int revert_seterr(git_commit *commit, const char *fmt)
{
char commit_oidstr[GIT_OID_HEXSZ + 1];
git_oid_fmt(commit_oidstr, git_commit_id(commit));
commit_oidstr[GIT_OID_HEXSZ] = '\0';
giterr_set(GITERR_REVERT, fmt, commit_oidstr);
return -1;
}
int git_revert_commit(
git_index **out,
git_repository *repo,
git_commit *revert_commit,
git_commit *our_commit,
unsigned int mainline,
const git_merge_options *merge_opts)
{
git_commit *parent_commit = NULL;
git_tree *parent_tree = NULL, *our_tree = NULL, *revert_tree = NULL;
int parent = 0, error = 0;
assert(out && repo && revert_commit && our_commit);
if (git_commit_parentcount(revert_commit) > 1) {
if (!mainline)
return revert_seterr(revert_commit,
"mainline branch is not specified but %s is a merge commit");
parent = mainline;
} else {
if (mainline)
return revert_seterr(revert_commit,
"mainline branch specified but %s is not a merge commit");
parent = git_commit_parentcount(revert_commit);
}
if (parent &&
((error = git_commit_parent(&parent_commit, revert_commit, (parent - 1))) < 0 ||
(error = git_commit_tree(&parent_tree, parent_commit)) < 0))
goto done;
if ((error = git_commit_tree(&revert_tree, revert_commit)) < 0 ||
(error = git_commit_tree(&our_tree, our_commit)) < 0)
goto done;
error = git_merge_trees(out, repo, revert_tree, our_tree, parent_tree, merge_opts);
done:
git_tree_free(parent_tree);
git_tree_free(our_tree);
git_tree_free(revert_tree);
git_commit_free(parent_commit);
return error;
}
int git_revert(
git_repository *repo,
git_commit *commit,
const git_revert_options *given_opts)
{
git_revert_options opts;
git_reference *our_ref = NULL;
git_commit *our_commit = NULL;
char commit_oidstr[GIT_OID_HEXSZ + 1];
const char *commit_msg;
git_buf their_label = GIT_BUF_INIT;
git_index *index = NULL;
git_indexwriter indexwriter = GIT_INDEXWRITER_INIT;
int error;
assert(repo && commit);
GITERR_CHECK_VERSION(given_opts, GIT_REVERT_OPTIONS_VERSION, "git_revert_options");
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 = git_indexwriter_init_for_operation(&indexwriter, repo, &opts.checkout_opts.checkout_strategy)) < 0 ||
(error = write_revert_head(repo, commit_oidstr)) < 0 ||
(error = write_merge_msg(repo, commit_oidstr, commit_msg)) < 0 ||
(error = git_repository_head(&our_ref, repo)) < 0 ||
(error = git_reference_peel((git_object **)&our_commit, our_ref, GIT_OBJ_COMMIT)) < 0 ||
(error = git_revert_commit(&index, repo, commit, our_commit, opts.mainline, &opts.merge_opts)) < 0 ||
(error = git_merge__check_result(repo, index)) < 0 ||
(error = git_merge__append_conflicts_to_merge_msg(repo, index)) < 0 ||
(error = git_checkout_index(repo, index, &opts.checkout_opts)) < 0 ||
(error = git_indexwriter_commit(&indexwriter)) < 0)
goto on_error;
goto done;
on_error:
revert_state_cleanup(repo);
done:
git_indexwriter_cleanup(&indexwriter);
git_index_free(index);
git_commit_free(our_commit);
git_reference_free(our_ref);
git_buf_free(&their_label);
return error;
}
int git_revert_init_options(git_revert_options *opts, unsigned int version)
{
GIT_INIT_STRUCTURE_FROM_TEMPLATE(
opts, version, git_revert_options, GIT_REVERT_OPTIONS_INIT);
return 0;
}
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