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/* Copyright (C) 2014-2015 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* coreutils.c aggregates the functionality of every other tool into a single
binary multiplexed by the value of argv[0]. This is enabled by passing
--enable-single-binary to configure.
Written by Alex Deymo <deymo@chromium.org>. */
#include <config.h>
#include <getopt.h>
#include <stdio.h>
#if HAVE_PRCTL
# include <sys/prctl.h>
#endif
#include "system.h"
#include "error.h"
#include "quote.h"
#ifdef SINGLE_BINARY
/* Declare the main function on each one of the selected tools. This name
needs to match the one passed as CFLAGS on single-binary.mk (generated
by gen-single-binary.sh). */
# define SINGLE_BINARY_PROGRAM(prog_name_str, main_name) \
int single_binary_main_##main_name (int, char **);
# include "coreutils.h"
# undef SINGLE_BINARY_PROGRAM
#endif
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "coreutils"
#define AUTHORS \
proper_name ("Alex Deymo")
static struct option const long_options[] =
{
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s --coreutils-prog=PROGRAM_NAME [PARAMETERS]... \n"),
program_name);
fputs (_("\
Execute the PROGRAM_NAME built-in program with the given PARAMETERS.\n\
\n"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
#ifdef SINGLE_BINARY
/* XXX: Ideally we'd like to present "install" here, not "ginstall". */
char const *prog_name_list =
# define SINGLE_BINARY_PROGRAM(prog_name_str, main_name) " " prog_name_str
# include "coreutils.h"
# undef SINGLE_BINARY_PROGRAM
;
printf ("\n\
Built-in programs:\n\
%s\n", prog_name_list);
#endif
printf (_("\
\n\
Use: '%s --coreutils-prog=PROGRAM_NAME --help' for individual program help.\n"),
program_name);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
static void
launch_program (const char *prog_name, int prog_argc, char **prog_argv)
{
int (*prog_main) (int, char **) = NULL;
/* Ensure that at least one parameter was passed. */
if (!prog_argc || !prog_argv || !prog_argv[0] || !prog_name)
return;
#ifdef SINGLE_BINARY
if (false);
/* Look up the right main program. */
# define SINGLE_BINARY_PROGRAM(prog_name_str, main_name) \
else if (STREQ (prog_name_str, prog_name)) \
prog_main = single_binary_main_##main_name;
# include "coreutils.h"
# undef SINGLE_BINARY_PROGRAM
#endif
if (! prog_main)
return;
#if HAVE_PRCTL && defined PR_SET_NAME
/* Not being able to set the program name is not a fatal error. */
prctl (PR_SET_NAME, prog_argv[0]);
#endif
#if HAVE_PRCTL && defined PR_SET_MM_ARG_START
/* Shift the beginning of the command line to prog_argv[0] (if set) so
/proc/pid/cmdline reflects the right value. */
prctl (PR_SET_MM_ARG_START, prog_argv[0]);
#endif
exit (prog_main (prog_argc, prog_argv));
}
int
main (int argc, char **argv)
{
char *prog_name = last_component (argv[0]);
int optc;
/* Map external name to internal name. */
char ginstall[] = "ginstall";
if (STREQ (prog_name, "install"))
prog_name = ginstall;
/* If this program is called directly as "coreutils" or if the value of
argv[0] is an unknown tool (which "coreutils" is), we proceed and parse
the options. */
launch_program (prog_name, argc, argv);
/* No known program was selected via argv[0]. Try parsing the first
argument as --coreutils-prog=PROGRAM to determine the program. The
invocation for this case should be:
path/to/coreutils --coreutils-prog=someprog someprog ...
The third argument is what the program will see as argv[0]. */
if (argc >= 2)
{
size_t nskip = 0;
char *arg_name = NULL;
/* If calling coreutils directly, the "script" name isn't passed.
Distinguish the two cases with a -shebang suffix. */
if (STRPREFIX (argv[1], "--coreutils-prog="))
{
nskip = 1;
arg_name = prog_name = argv[1] + strlen ("--coreutils-prog=");
}
else if (STRPREFIX (argv[1], "--coreutils-prog-shebang="))
{
nskip = 2;
prog_name = argv[1] + strlen ("--coreutils-prog-shebang=");
if (argc >= 3)
arg_name = last_component (argv[2]);
else
arg_name = prog_name;
}
if (nskip)
{
argv[nskip] = arg_name; /* XXX: Discards any specified path. */
launch_program (prog_name, argc - nskip, argv + nskip);
error (EXIT_FAILURE, 0, _("unknown program %s"),
quote (prog_name));
}
}
/* No known program was selected. From here on, we behave like any other
coreutils program. */
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
if ((optc = getopt_long (argc, argv, "", long_options, NULL)) != -1)
switch (optc)
{
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
}
/* Only print the error message when no options have been passed
to coreutils. */
if (optind == 1 && prog_name && !STREQ (prog_name, "coreutils"))
error (0, 0, _("unknown program %s"),
quote (prog_name));
usage (EXIT_FAILURE);
}
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