thodg/libgit2/src/revert.c

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• Hash : bab0b9f2
  Author :
  Date : 2013-11-22T18:02:12
  

  clean up state metadata more consistently

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• src/revert.c

• /*
  * 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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