diff options
Diffstat (limited to 'third_party/git/git.c')
| -rw-r--r-- | third_party/git/git.c | 892 |
1 files changed, 892 insertions, 0 deletions
diff --git a/third_party/git/git.c b/third_party/git/git.c new file mode 100644 index 000000000000..7be7ad34bd05 --- /dev/null +++ b/third_party/git/git.c @@ -0,0 +1,892 @@ +#include "builtin.h" +#include "config.h" +#include "exec-cmd.h" +#include "help.h" +#include "run-command.h" +#include "alias.h" + +#define RUN_SETUP (1<<0) +#define RUN_SETUP_GENTLY (1<<1) +#define USE_PAGER (1<<2) +/* + * require working tree to be present -- anything uses this needs + * RUN_SETUP for reading from the configuration file. + */ +#define NEED_WORK_TREE (1<<3) +#define SUPPORT_SUPER_PREFIX (1<<4) +#define DELAY_PAGER_CONFIG (1<<5) +#define NO_PARSEOPT (1<<6) /* parse-options is not used */ + +struct cmd_struct { + const char *cmd; + int (*fn)(int, const char **, const char *); + unsigned int option; +}; + +const char git_usage_string[] = + N_("git [--version] [--help] [-C <path>] [-c <name>=<value>]\n" + " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n" + " [-p | --paginate | -P | --no-pager] [--no-replace-objects] [--bare]\n" + " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n" + " <command> [<args>]"); + +const char git_more_info_string[] = + N_("'git help -a' and 'git help -g' list available subcommands and some\n" + "concept guides. See 'git help <command>' or 'git help <concept>'\n" + "to read about a specific subcommand or concept.\n" + "See 'git help git' for an overview of the system."); + +static int use_pager = -1; + +static void list_builtins(struct string_list *list, unsigned int exclude_option); + +static void exclude_helpers_from_list(struct string_list *list) +{ + int i = 0; + + while (i < list->nr) { + if (strstr(list->items[i].string, "--")) + unsorted_string_list_delete_item(list, i, 0); + else + i++; + } +} + +static int match_token(const char *spec, int len, const char *token) +{ + int token_len = strlen(token); + + return len == token_len && !strncmp(spec, token, token_len); +} + +static int list_cmds(const char *spec) +{ + struct string_list list = STRING_LIST_INIT_DUP; + int i; + int nongit; + + /* + * Set up the repository so we can pick up any repo-level config (like + * completion.commands). + */ + setup_git_directory_gently(&nongit); + + while (*spec) { + const char *sep = strchrnul(spec, ','); + int len = sep - spec; + + if (match_token(spec, len, "builtins")) + list_builtins(&list, 0); + else if (match_token(spec, len, "main")) + list_all_main_cmds(&list); + else if (match_token(spec, len, "others")) + list_all_other_cmds(&list); + else if (match_token(spec, len, "nohelpers")) + exclude_helpers_from_list(&list); + else if (match_token(spec, len, "alias")) + list_aliases(&list); + else if (match_token(spec, len, "config")) + list_cmds_by_config(&list); + else if (len > 5 && !strncmp(spec, "list-", 5)) { + struct strbuf sb = STRBUF_INIT; + + strbuf_add(&sb, spec + 5, len - 5); + list_cmds_by_category(&list, sb.buf); + strbuf_release(&sb); + } + else + die(_("unsupported command listing type '%s'"), spec); + spec += len; + if (*spec == ',') + spec++; + } + for (i = 0; i < list.nr; i++) + puts(list.items[i].string); + string_list_clear(&list, 0); + return 0; +} + +static void commit_pager_choice(void) +{ + switch (use_pager) { + case 0: + setenv("GIT_PAGER", "cat", 1); + break; + case 1: + setup_pager(); + break; + default: + break; + } +} + +void setup_auto_pager(const char *cmd, int def) +{ + if (use_pager != -1 || pager_in_use()) + return; + use_pager = check_pager_config(cmd); + if (use_pager == -1) + use_pager = def; + commit_pager_choice(); +} + +static int handle_options(const char ***argv, int *argc, int *envchanged) +{ + const char **orig_argv = *argv; + + while (*argc > 0) { + const char *cmd = (*argv)[0]; + if (cmd[0] != '-') + break; + + /* + * For legacy reasons, the "version" and "help" + * commands can be written with "--" prepended + * to make them look like flags. + */ + if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) + break; + + /* + * Check remaining flags. + */ + if (skip_prefix(cmd, "--exec-path", &cmd)) { + if (*cmd == '=') + git_set_exec_path(cmd + 1); + else { + puts(git_exec_path()); + trace2_cmd_name("_query_"); + exit(0); + } + } else if (!strcmp(cmd, "--html-path")) { + puts(system_path(GIT_HTML_PATH)); + trace2_cmd_name("_query_"); + exit(0); + } else if (!strcmp(cmd, "--man-path")) { + puts(system_path(GIT_MAN_PATH)); + trace2_cmd_name("_query_"); + exit(0); + } else if (!strcmp(cmd, "--info-path")) { + puts(system_path(GIT_INFO_PATH)); + trace2_cmd_name("_query_"); + exit(0); + } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { + use_pager = 1; + } else if (!strcmp(cmd, "-P") || !strcmp(cmd, "--no-pager")) { + use_pager = 0; + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--no-replace-objects")) { + read_replace_refs = 0; + setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--git-dir")) { + if (*argc < 2) { + fprintf(stderr, _("no directory given for --git-dir\n" )); + usage(git_usage_string); + } + setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; + (*argv)++; + (*argc)--; + } else if (skip_prefix(cmd, "--git-dir=", &cmd)) { + setenv(GIT_DIR_ENVIRONMENT, cmd, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--namespace")) { + if (*argc < 2) { + fprintf(stderr, _("no namespace given for --namespace\n" )); + usage(git_usage_string); + } + setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; + (*argv)++; + (*argc)--; + } else if (skip_prefix(cmd, "--namespace=", &cmd)) { + setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--work-tree")) { + if (*argc < 2) { + fprintf(stderr, _("no directory given for --work-tree\n" )); + usage(git_usage_string); + } + setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; + (*argv)++; + (*argc)--; + } else if (skip_prefix(cmd, "--work-tree=", &cmd)) { + setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--super-prefix")) { + if (*argc < 2) { + fprintf(stderr, _("no prefix given for --super-prefix\n" )); + usage(git_usage_string); + } + setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; + (*argv)++; + (*argc)--; + } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) { + setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--bare")) { + char *cwd = xgetcwd(); + is_bare_repository_cfg = 1; + setenv(GIT_DIR_ENVIRONMENT, cwd, 0); + free(cwd); + setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "-c")) { + if (*argc < 2) { + fprintf(stderr, _("-c expects a configuration string\n" )); + usage(git_usage_string); + } + git_config_push_parameter((*argv)[1]); + (*argv)++; + (*argc)--; + } else if (!strcmp(cmd, "--literal-pathspecs")) { + setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--no-literal-pathspecs")) { + setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--glob-pathspecs")) { + setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--noglob-pathspecs")) { + setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--icase-pathspecs")) { + setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--no-optional-locks")) { + setenv(GIT_OPTIONAL_LOCKS_ENVIRONMENT, "0", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--shallow-file")) { + (*argv)++; + (*argc)--; + set_alternate_shallow_file(the_repository, (*argv)[0], 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "-C")) { + if (*argc < 2) { + fprintf(stderr, _("no directory given for -C\n" )); + usage(git_usage_string); + } + if ((*argv)[1][0]) { + if (chdir((*argv)[1])) + die_errno("cannot change to '%s'", (*argv)[1]); + if (envchanged) + *envchanged = 1; + } + (*argv)++; + (*argc)--; + } else if (skip_prefix(cmd, "--list-cmds=", &cmd)) { + trace2_cmd_name("_query_"); + if (!strcmp(cmd, "parseopt")) { + struct string_list list = STRING_LIST_INIT_DUP; + int i; + + list_builtins(&list, NO_PARSEOPT); + for (i = 0; i < list.nr; i++) + printf("%s ", list.items[i].string); + string_list_clear(&list, 0); + exit(0); + } else { + exit(list_cmds(cmd)); + } + } else { + fprintf(stderr, _("unknown option: %s\n"), cmd); + usage(git_usage_string); + } + + (*argv)++; + (*argc)--; + } + return (*argv) - orig_argv; +} + +static int handle_alias(int *argcp, const char ***argv) +{ + int envchanged = 0, ret = 0, saved_errno = errno; + int count, option_count; + const char **new_argv; + const char *alias_command; + char *alias_string; + + alias_command = (*argv)[0]; + alias_string = alias_lookup(alias_command); + if (alias_string) { + if (*argcp > 1 && !strcmp((*argv)[1], "-h")) + fprintf_ln(stderr, _("'%s' is aliased to '%s'"), + alias_command, alias_string); + if (alias_string[0] == '!') { + struct child_process child = CHILD_PROCESS_INIT; + int nongit_ok; + + /* Aliases expect GIT_PREFIX, GIT_DIR etc to be set */ + setup_git_directory_gently(&nongit_ok); + + commit_pager_choice(); + + child.use_shell = 1; + child.trace2_child_class = "shell_alias"; + argv_array_push(&child.args, alias_string + 1); + argv_array_pushv(&child.args, (*argv) + 1); + + trace2_cmd_alias(alias_command, child.args.argv); + trace2_cmd_list_config(); + trace2_cmd_name("_run_shell_alias_"); + + ret = run_command(&child); + if (ret >= 0) /* normal exit */ + exit(ret); + + die_errno(_("while expanding alias '%s': '%s'"), + alias_command, alias_string + 1); + } + count = split_cmdline(alias_string, &new_argv); + if (count < 0) + die(_("bad alias.%s string: %s"), alias_command, + _(split_cmdline_strerror(count))); + option_count = handle_options(&new_argv, &count, &envchanged); + if (envchanged) + die(_("alias '%s' changes environment variables.\n" + "You can use '!git' in the alias to do this"), + alias_command); + MOVE_ARRAY(new_argv - option_count, new_argv, count); + new_argv -= option_count; + + if (count < 1) + die(_("empty alias for %s"), alias_command); + + if (!strcmp(alias_command, new_argv[0])) + die(_("recursive alias: %s"), alias_command); + + trace_argv_printf(new_argv, + "trace: alias expansion: %s =>", + alias_command); + + REALLOC_ARRAY(new_argv, count + *argcp); + /* insert after command name */ + COPY_ARRAY(new_argv + count, *argv + 1, *argcp); + + trace2_cmd_alias(alias_command, new_argv); + trace2_cmd_list_config(); + + *argv = new_argv; + *argcp += count - 1; + + ret = 1; + } + + errno = saved_errno; + + return ret; +} + +static int run_builtin(struct cmd_struct *p, int argc, const char **argv) +{ + int status, help; + struct stat st; + const char *prefix; + + prefix = NULL; + help = argc == 2 && !strcmp(argv[1], "-h"); + if (!help) { + if (p->option & RUN_SETUP) + prefix = setup_git_directory(); + else if (p->option & RUN_SETUP_GENTLY) { + int nongit_ok; + prefix = setup_git_directory_gently(&nongit_ok); + } + + if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) && + !(p->option & DELAY_PAGER_CONFIG)) + use_pager = check_pager_config(p->cmd); + if (use_pager == -1 && p->option & USE_PAGER) + use_pager = 1; + + if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) && + startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */ + trace_repo_setup(prefix); + } + commit_pager_choice(); + + if (!help && get_super_prefix()) { + if (!(p->option & SUPPORT_SUPER_PREFIX)) + die(_("%s doesn't support --super-prefix"), p->cmd); + } + + if (!help && p->option & NEED_WORK_TREE) + setup_work_tree(); + + trace_argv_printf(argv, "trace: built-in: git"); + trace2_cmd_name(p->cmd); + trace2_cmd_list_config(); + + validate_cache_entries(the_repository->index); + status = p->fn(argc, argv, prefix); + validate_cache_entries(the_repository->index); + + if (status) + return status; + + /* Somebody closed stdout? */ + if (fstat(fileno(stdout), &st)) + return 0; + /* Ignore write errors for pipes and sockets.. */ + if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) + return 0; + + /* Check for ENOSPC and EIO errors.. */ + if (fflush(stdout)) + die_errno(_("write failure on standard output")); + if (ferror(stdout)) + die(_("unknown write failure on standard output")); + if (fclose(stdout)) + die_errno(_("close failed on standard output")); + return 0; +} + +static struct cmd_struct commands[] = { + { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE }, + { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE }, + { "annotate", cmd_annotate, RUN_SETUP | NO_PARSEOPT }, + { "apply", cmd_apply, RUN_SETUP_GENTLY }, + { "archive", cmd_archive, RUN_SETUP_GENTLY }, + { "bisect--helper", cmd_bisect__helper, RUN_SETUP }, + { "blame", cmd_blame, RUN_SETUP }, + { "branch", cmd_branch, RUN_SETUP | DELAY_PAGER_CONFIG }, + { "bundle", cmd_bundle, RUN_SETUP_GENTLY | NO_PARSEOPT }, + { "cat-file", cmd_cat_file, RUN_SETUP }, + { "check-attr", cmd_check_attr, RUN_SETUP }, + { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE }, + { "check-mailmap", cmd_check_mailmap, RUN_SETUP }, + { "check-ref-format", cmd_check_ref_format, NO_PARSEOPT }, + { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE }, + { "checkout-index", cmd_checkout_index, + RUN_SETUP | NEED_WORK_TREE}, + { "cherry", cmd_cherry, RUN_SETUP }, + { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE }, + { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, + { "clone", cmd_clone }, + { "column", cmd_column, RUN_SETUP_GENTLY }, + { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, + { "commit-graph", cmd_commit_graph, RUN_SETUP }, + { "commit-tree", cmd_commit_tree, RUN_SETUP | NO_PARSEOPT }, + { "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG }, + { "count-objects", cmd_count_objects, RUN_SETUP }, + { "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT }, + { "describe", cmd_describe, RUN_SETUP }, + { "diff", cmd_diff, NO_PARSEOPT }, + { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT }, + { "diff-index", cmd_diff_index, RUN_SETUP | NO_PARSEOPT }, + { "diff-tree", cmd_diff_tree, RUN_SETUP | NO_PARSEOPT }, + { "difftool", cmd_difftool, RUN_SETUP_GENTLY }, + { "env--helper", cmd_env__helper }, + { "fast-export", cmd_fast_export, RUN_SETUP }, + { "fetch", cmd_fetch, RUN_SETUP }, + { "fetch-pack", cmd_fetch_pack, RUN_SETUP | NO_PARSEOPT }, + { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP }, + { "for-each-ref", cmd_for_each_ref, RUN_SETUP }, + { "format-patch", cmd_format_patch, RUN_SETUP }, + { "fsck", cmd_fsck, RUN_SETUP }, + { "fsck-objects", cmd_fsck, RUN_SETUP }, + { "gc", cmd_gc, RUN_SETUP }, + { "get-tar-commit-id", cmd_get_tar_commit_id, NO_PARSEOPT }, + { "grep", cmd_grep, RUN_SETUP_GENTLY }, + { "hash-object", cmd_hash_object }, + { "help", cmd_help }, + { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY | NO_PARSEOPT }, + { "init", cmd_init_db }, + { "init-db", cmd_init_db }, + { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY }, + { "log", cmd_log, RUN_SETUP }, + { "ls-files", cmd_ls_files, RUN_SETUP }, + { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY }, + { "ls-tree", cmd_ls_tree, RUN_SETUP }, + { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY | NO_PARSEOPT }, + { "mailsplit", cmd_mailsplit, NO_PARSEOPT }, + { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE }, + { "merge-base", cmd_merge_base, RUN_SETUP }, + { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY }, + { "merge-index", cmd_merge_index, RUN_SETUP | NO_PARSEOPT }, + { "merge-ours", cmd_merge_ours, RUN_SETUP | NO_PARSEOPT }, + { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT }, + { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT }, + { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT }, + { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE | NO_PARSEOPT }, + { "merge-tree", cmd_merge_tree, RUN_SETUP | NO_PARSEOPT }, + { "mktag", cmd_mktag, RUN_SETUP | NO_PARSEOPT }, + { "mktree", cmd_mktree, RUN_SETUP }, + { "multi-pack-index", cmd_multi_pack_index, RUN_SETUP_GENTLY }, + { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE }, + { "name-rev", cmd_name_rev, RUN_SETUP }, + { "notes", cmd_notes, RUN_SETUP }, + { "pack-objects", cmd_pack_objects, RUN_SETUP }, + { "pack-redundant", cmd_pack_redundant, RUN_SETUP | NO_PARSEOPT }, + { "pack-refs", cmd_pack_refs, RUN_SETUP }, + { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY | NO_PARSEOPT }, + { "pickaxe", cmd_blame, RUN_SETUP }, + { "prune", cmd_prune, RUN_SETUP }, + { "prune-packed", cmd_prune_packed, RUN_SETUP }, + { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE }, + { "push", cmd_push, RUN_SETUP }, + { "range-diff", cmd_range_diff, RUN_SETUP | USE_PAGER }, + { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX}, + { "rebase", cmd_rebase, RUN_SETUP | NEED_WORK_TREE }, + { "rebase--interactive", cmd_rebase__interactive, RUN_SETUP | NEED_WORK_TREE }, + { "receive-pack", cmd_receive_pack }, + { "reflog", cmd_reflog, RUN_SETUP }, + { "remote", cmd_remote, RUN_SETUP }, + { "remote-ext", cmd_remote_ext, NO_PARSEOPT }, + { "remote-fd", cmd_remote_fd, NO_PARSEOPT }, + { "repack", cmd_repack, RUN_SETUP }, + { "replace", cmd_replace, RUN_SETUP }, + { "rerere", cmd_rerere, RUN_SETUP }, + { "reset", cmd_reset, RUN_SETUP }, + { "restore", cmd_restore, RUN_SETUP | NEED_WORK_TREE }, + { "rev-list", cmd_rev_list, RUN_SETUP | NO_PARSEOPT }, + { "rev-parse", cmd_rev_parse, NO_PARSEOPT }, + { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE }, + { "rm", cmd_rm, RUN_SETUP }, + { "send-pack", cmd_send_pack, RUN_SETUP }, + { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER }, + { "show", cmd_show, RUN_SETUP }, + { "show-branch", cmd_show_branch, RUN_SETUP }, + { "show-index", cmd_show_index }, + { "show-ref", cmd_show_ref, RUN_SETUP }, + { "sparse-checkout", cmd_sparse_checkout, RUN_SETUP | NEED_WORK_TREE }, + { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE }, + /* + * NEEDSWORK: Until the builtin stash is thoroughly robust and no + * longer needs redirection to the stash shell script this is kept as + * is, then should be changed to RUN_SETUP | NEED_WORK_TREE + */ + { "stash", cmd_stash }, + { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE }, + { "stripspace", cmd_stripspace }, + { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX | NO_PARSEOPT }, + { "switch", cmd_switch, RUN_SETUP | NEED_WORK_TREE }, + { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP }, + { "tag", cmd_tag, RUN_SETUP | DELAY_PAGER_CONFIG }, + { "unpack-file", cmd_unpack_file, RUN_SETUP | NO_PARSEOPT }, + { "unpack-objects", cmd_unpack_objects, RUN_SETUP | NO_PARSEOPT }, + { "update-index", cmd_update_index, RUN_SETUP }, + { "update-ref", cmd_update_ref, RUN_SETUP }, + { "update-server-info", cmd_update_server_info, RUN_SETUP }, + { "upload-archive", cmd_upload_archive, NO_PARSEOPT }, + { "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT }, + { "upload-pack", cmd_upload_pack }, + { "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT }, + { "verify-commit", cmd_verify_commit, RUN_SETUP }, + { "verify-pack", cmd_verify_pack }, + { "verify-tag", cmd_verify_tag, RUN_SETUP }, + { "version", cmd_version }, + { "whatchanged", cmd_whatchanged, RUN_SETUP }, + { "worktree", cmd_worktree, RUN_SETUP | NO_PARSEOPT }, + { "write-tree", cmd_write_tree, RUN_SETUP }, +}; + +static struct cmd_struct *get_builtin(const char *s) +{ + int i; + for (i = 0; i < ARRAY_SIZE(commands); i++) { + struct cmd_struct *p = commands + i; + if (!strcmp(s, p->cmd)) + return p; + } + return NULL; +} + +int is_builtin(const char *s) +{ + return !!get_builtin(s); +} + +static void list_builtins(struct string_list *out, unsigned int exclude_option) +{ + int i; + for (i = 0; i < ARRAY_SIZE(commands); i++) { + if (exclude_option && + (commands[i].option & exclude_option)) + continue; + string_list_append(out, commands[i].cmd); + } +} + +#ifdef STRIP_EXTENSION +static void strip_extension(const char **argv) +{ + size_t len; + + if (strip_suffix(argv[0], STRIP_EXTENSION, &len)) + argv[0] = xmemdupz(argv[0], len); +} +#else +#define strip_extension(cmd) +#endif + +static void handle_builtin(int argc, const char **argv) +{ + struct argv_array args = ARGV_ARRAY_INIT; + const char *cmd; + struct cmd_struct *builtin; + + strip_extension(argv); + cmd = argv[0]; + + /* Turn "git cmd --help" into "git help --exclude-guides cmd" */ + if (argc > 1 && !strcmp(argv[1], "--help")) { + int i; + + argv[1] = argv[0]; + argv[0] = cmd = "help"; + + for (i = 0; i < argc; i++) { + argv_array_push(&args, argv[i]); + if (!i) + argv_array_push(&args, "--exclude-guides"); + } + + argc++; + argv = args.argv; + } + + builtin = get_builtin(cmd); + if (builtin) + exit(run_builtin(builtin, argc, argv)); + argv_array_clear(&args); +} + +static void execv_dashed_external(const char **argv) +{ + struct child_process cmd = CHILD_PROCESS_INIT; + int status; + + if (get_super_prefix()) + die(_("%s doesn't support --super-prefix"), argv[0]); + + if (use_pager == -1 && !is_builtin(argv[0])) + use_pager = check_pager_config(argv[0]); + commit_pager_choice(); + + argv_array_pushf(&cmd.args, "git-%s", argv[0]); + argv_array_pushv(&cmd.args, argv + 1); + cmd.clean_on_exit = 1; + cmd.wait_after_clean = 1; + cmd.silent_exec_failure = 1; + cmd.trace2_child_class = "dashed"; + + trace2_cmd_name("_run_dashed_"); + + /* + * The code in run_command() logs trace2 child_start/child_exit + * events, so we do not need to report exec/exec_result events here. + */ + trace_argv_printf(cmd.args.argv, "trace: exec:"); + + /* + * If we fail because the command is not found, it is + * OK to return. Otherwise, we just pass along the status code, + * or our usual generic code if we were not even able to exec + * the program. + */ + status = run_command(&cmd); + + /* + * If the child process ran and we are now going to exit, emit a + * generic string as our trace2 command verb to indicate that we + * launched a dashed command. + */ + if (status >= 0) + exit(status); + else if (errno != ENOENT) + exit(128); +} + +static int run_argv(int *argcp, const char ***argv) +{ + int done_alias = 0; + struct string_list cmd_list = STRING_LIST_INIT_NODUP; + struct string_list_item *seen; + + while (1) { + /* + * If we tried alias and futzed with our environment, + * it no longer is safe to invoke builtins directly in + * general. We have to spawn them as dashed externals. + * + * NEEDSWORK: if we can figure out cases + * where it is safe to do, we can avoid spawning a new + * process. + */ + if (!done_alias) + handle_builtin(*argcp, *argv); + else if (get_builtin(**argv)) { + struct argv_array args = ARGV_ARRAY_INIT; + int i; + + /* + * The current process is committed to launching a + * child process to run the command named in (**argv) + * and exiting. Log a generic string as the trace2 + * command verb to indicate this. Note that the child + * process will log the actual verb when it runs. + */ + trace2_cmd_name("_run_git_alias_"); + + if (get_super_prefix()) + die("%s doesn't support --super-prefix", **argv); + + commit_pager_choice(); + + argv_array_push(&args, "git"); + for (i = 0; i < *argcp; i++) + argv_array_push(&args, (*argv)[i]); + + trace_argv_printf(args.argv, "trace: exec:"); + + /* + * if we fail because the command is not found, it is + * OK to return. Otherwise, we just pass along the status code. + */ + i = run_command_v_opt_tr2(args.argv, RUN_SILENT_EXEC_FAILURE | + RUN_CLEAN_ON_EXIT, "git_alias"); + if (i >= 0 || errno != ENOENT) + exit(i); + die("could not execute builtin %s", **argv); + } + + /* .. then try the external ones */ + execv_dashed_external(*argv); + + seen = unsorted_string_list_lookup(&cmd_list, *argv[0]); + if (seen) { + int i; + struct strbuf sb = STRBUF_INIT; + for (i = 0; i < cmd_list.nr; i++) { + struct string_list_item *item = &cmd_list.items[i]; + + strbuf_addf(&sb, "\n %s", item->string); + if (item == seen) + strbuf_addstr(&sb, " <=="); + else if (i == cmd_list.nr - 1) + strbuf_addstr(&sb, " ==>"); + } + die(_("alias loop detected: expansion of '%s' does" + " not terminate:%s"), cmd_list.items[0].string, sb.buf); + } + + string_list_append(&cmd_list, *argv[0]); + + /* + * It could be an alias -- this works around the insanity + * of overriding "git log" with "git show" by having + * alias.log = show + */ + if (!handle_alias(argcp, argv)) + break; + done_alias = 1; + } + + string_list_clear(&cmd_list, 0); + + return done_alias; +} + +int cmd_main(int argc, const char **argv) +{ + const char *cmd; + int done_help = 0; + + cmd = argv[0]; + if (!cmd) + cmd = "git-help"; + else { + const char *slash = find_last_dir_sep(cmd); + if (slash) + cmd = slash + 1; + } + + trace_command_performance(argv); + + /* + * "git-xxxx" is the same as "git xxxx", but we obviously: + * + * - cannot take flags in between the "git" and the "xxxx". + * - cannot execute it externally (since it would just do + * the same thing over again) + * + * So we just directly call the builtin handler, and die if + * that one cannot handle it. + */ + if (skip_prefix(cmd, "git-", &cmd)) { + argv[0] = cmd; + handle_builtin(argc, argv); + die(_("cannot handle %s as a builtin"), cmd); + } + + /* Look for flags.. */ + argv++; + argc--; + handle_options(&argv, &argc, NULL); + if (argc > 0) { + /* translate --help and --version into commands */ + skip_prefix(argv[0], "--", &argv[0]); + } else { + /* The user didn't specify a command; give them help */ + commit_pager_choice(); + printf(_("usage: %s\n\n"), git_usage_string); + list_common_cmds_help(); + printf("\n%s\n", _(git_more_info_string)); + exit(1); + } + cmd = argv[0]; + + /* + * We use PATH to find git commands, but we prepend some higher + * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH + * environment, and the $(gitexecdir) from the Makefile at build + * time. + */ + setup_path(); + + while (1) { + int was_alias = run_argv(&argc, &argv); + if (errno != ENOENT) + break; + if (was_alias) { + fprintf(stderr, _("expansion of alias '%s' failed; " + "'%s' is not a git command\n"), + cmd, argv[0]); + exit(1); + } + if (!done_help) { + cmd = argv[0] = help_unknown_cmd(cmd); + done_help = 1; + } else + break; + } + + fprintf(stderr, _("failed to run command '%s': %s\n"), + cmd, strerror(errno)); + + return 1; +} |