From 300d192f7ed45112121f2a35d5ca80a4913c7aad Mon Sep 17 00:00:00 2001 From: Edward Thomson Date: Mon, 2 Dec 2013 11:15:27 -0500 Subject: Introduce git_revert to revert a single commit --- src/revert.c | 217 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 217 insertions(+) create mode 100644 src/revert.c (limited to 'src/revert.c') diff --git a/src/revert.c b/src/revert.c new file mode 100644 index 000000000..34ba343b6 --- /dev/null +++ b/src/revert.c @@ -0,0 +1,217 @@ +/* +* 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 "revert.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; +} + +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: + git_revert__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; +} + +int git_revert__cleanup(git_repository *repo) +{ + int error = 0; + git_buf revert_head_path = GIT_BUF_INIT, + merge_msg_path = GIT_BUF_INIT; + + assert(repo); + + if (git_buf_joinpath(&revert_head_path, repo->path_repository, GIT_REVERT_HEAD_FILE) < 0 || + git_buf_joinpath(&merge_msg_path, repo->path_repository, GIT_MERGE_MSG_FILE) < 0) + return -1; + + if (git_path_isfile(revert_head_path.ptr)) { + if ((error = p_unlink(revert_head_path.ptr)) < 0) + goto cleanup; + } + + if (git_path_isfile(merge_msg_path.ptr)) + (void)p_unlink(merge_msg_path.ptr); + +cleanup: + git_buf_free(&merge_msg_path); + git_buf_free(&revert_head_path); + + return error; +} -- cgit v1.2.3