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/* Create a temporary file or directory, safely.
Copyright (C) 2007-2013 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/>. */
/* Written by Jim Meyering and Eric Blake. */
#include <config.h>
#include <sys/types.h>
#include <getopt.h>
#include "system.h"
#include "close-stream.h"
#include "error.h"
#include "filenamecat.h"
#include "quote.h"
#include "tempname.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "mktemp"
#define AUTHORS \
proper_name ("Jim Meyering"), \
proper_name ("Eric Blake")
static const char *default_template = "tmp.XXXXXXXXXX";
/* For long options that have no equivalent short option, use a
non-character as a pseudo short option, starting with CHAR_MAX + 1. */
enum
{
SUFFIX_OPTION = CHAR_MAX + 1,
};
static struct option const longopts[] =
{
{"directory", no_argument, NULL, 'd'},
{"quiet", no_argument, NULL, 'q'},
{"dry-run", no_argument, NULL, 'u'},
{"suffix", required_argument, NULL, SUFFIX_OPTION},
{"tmpdir", optional_argument, NULL, 'p'},
{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 [OPTION]... [TEMPLATE]\n"), program_name);
fputs (_("\
Create a temporary file or directory, safely, and print its name.\n\
TEMPLATE must contain at least 3 consecutive 'X's in last component.\n\
If TEMPLATE is not specified, use tmp.XXXXXXXXXX, and --tmpdir is implied.\n\
"), stdout);
fputs (_("\
Files are created u+rw, and directories u+rwx, minus umask restrictions.\n\
"), stdout);
fputs ("\n", stdout);
fputs (_("\
-d, --directory create a directory, not a file\n\
-u, --dry-run do not create anything; merely print a name (unsafe)\n\
-q, --quiet suppress diagnostics about file/dir-creation failure\n\
"), stdout);
fputs (_("\
--suffix=SUFF append SUFF to TEMPLATE; SUFF must not contain a slash.\n\
This option is implied if TEMPLATE does not end in X\n\
"), stdout);
fputs (_("\
-p DIR, --tmpdir[=DIR] interpret TEMPLATE relative to DIR; if DIR is not\n\
specified, use $TMPDIR if set, else /tmp. With\n\
this option, TEMPLATE must not be an absolute name;\n\
unlike with -t, TEMPLATE may contain slashes, but\n\
mktemp creates only the final component\n\
"), stdout);
fputs (_("\
-t interpret TEMPLATE as a single file name component,\n\
relative to a directory: $TMPDIR, if set; else the\n\
directory specified via -p; else /tmp [deprecated]\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
emit_ancillary_info ();
}
exit (status);
}
static size_t
count_consecutive_X_s (const char *s, size_t len)
{
size_t n = 0;
for ( ; len && s[len-1] == 'X'; len--)
++n;
return n;
}
static int
mkstemp_len (char *tmpl, size_t suff_len, size_t x_len, bool dry_run)
{
return gen_tempname_len (tmpl, suff_len, 0, dry_run ? GT_NOCREATE : GT_FILE,
x_len);
}
static int
mkdtemp_len (char *tmpl, size_t suff_len, size_t x_len, bool dry_run)
{
return gen_tempname_len (tmpl, suff_len, 0, dry_run ? GT_NOCREATE : GT_DIR,
x_len);
}
/* True if we have already closed standard output. */
static bool stdout_closed;
/* Avoid closing stdout twice. Since we conditionally call
close_stream (stdout) in order to decide whether to clean up a
temporary file, the exit hook needs to know whether to do all of
close_stdout or just the stderr half. */
static void
maybe_close_stdout (void)
{
if (!stdout_closed)
close_stdout ();
else if (close_stream (stderr) != 0)
_exit (EXIT_FAILURE);
}
int
main (int argc, char **argv)
{
char const *dest_dir;
char const *dest_dir_arg = NULL;
bool suppress_file_err = false;
int c;
unsigned int n_args;
char *template;
char *suffix = NULL;
bool use_dest_dir = false;
bool deprecated_t_option = false;
bool create_directory = false;
bool dry_run = false;
int status = EXIT_SUCCESS;
size_t x_count;
size_t suffix_len;
char *dest_name;
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (maybe_close_stdout);
while ((c = getopt_long (argc, argv, "dp:qtuV", longopts, NULL)) != -1)
{
switch (c)
{
case 'd':
create_directory = true;
break;
case 'p':
dest_dir_arg = optarg;
use_dest_dir = true;
break;
case 'q':
suppress_file_err = true;
break;
case 't':
use_dest_dir = true;
deprecated_t_option = true;
break;
case 'u':
dry_run = true;
break;
case SUFFIX_OPTION:
suffix = optarg;
break;
case_GETOPT_HELP_CHAR;
case 'V': /* Undocumented alias, for compatibility with the original
mktemp program. */
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
}
n_args = argc - optind;
if (2 <= n_args)
{
error (0, 0, _("too many templates"));
usage (EXIT_FAILURE);
}
if (n_args == 0)
{
use_dest_dir = true;
template = (char *) default_template;
}
else
{
template = argv[optind];
}
if (suffix)
{
size_t len = strlen (template);
if (!len || template[len - 1] != 'X')
{
error (EXIT_FAILURE, 0,
_("with --suffix, template %s must end in X"),
quote (template));
}
suffix_len = strlen (suffix);
dest_name = xcharalloc (len + suffix_len + 1);
memcpy (dest_name, template, len);
memcpy (dest_name + len, suffix, suffix_len + 1);
template = dest_name;
suffix = dest_name + len;
}
else
{
template = xstrdup (template);
suffix = strrchr (template, 'X');
if (!suffix)
suffix = strchr (template, '\0');
else
suffix++;
suffix_len = strlen (suffix);
}
/* At this point, template is malloc'd, and suffix points into template. */
if (suffix_len && last_component (suffix) != suffix)
{
error (EXIT_FAILURE, 0,
_("invalid suffix %s, contains directory separator"),
quote (suffix));
}
x_count = count_consecutive_X_s (template, suffix - template);
if (x_count < 3)
error (EXIT_FAILURE, 0, _("too few X's in template %s"), quote (template));
if (use_dest_dir)
{
if (deprecated_t_option)
{
char *env = getenv ("TMPDIR");
if (env && *env)
dest_dir = env;
else if (dest_dir_arg && *dest_dir_arg)
dest_dir = dest_dir_arg;
else
dest_dir = "/tmp";
if (last_component (template) != template)
error (EXIT_FAILURE, 0,
_("invalid template, %s, contains directory separator"),
quote (template));
}
else
{
if (dest_dir_arg && *dest_dir_arg)
dest_dir = dest_dir_arg;
else
{
char *env = getenv ("TMPDIR");
dest_dir = (env && *env ? env : "/tmp");
}
if (IS_ABSOLUTE_FILE_NAME (template))
error (EXIT_FAILURE, 0,
_("invalid template, %s; with --tmpdir,"
" it may not be absolute"),
quote (template));
}
dest_name = file_name_concat (dest_dir, template, NULL);
free (template);
template = dest_name;
/* Note that suffix is now invalid. */
}
/* Make a copy to be used in case of diagnostic, since failing
mkstemp may leave the buffer in an undefined state. */
dest_name = xstrdup (template);
if (create_directory)
{
int err = mkdtemp_len (dest_name, suffix_len, x_count, dry_run);
if (err != 0)
{
if (!suppress_file_err)
error (0, errno, _("failed to create directory via template %s"),
quote (template));
status = EXIT_FAILURE;
}
}
else
{
int fd = mkstemp_len (dest_name, suffix_len, x_count, dry_run);
if (fd < 0 || (!dry_run && close (fd) != 0))
{
if (!suppress_file_err)
error (0, errno, _("failed to create file via template %s"),
quote (template));
status = EXIT_FAILURE;
}
}
if (status == EXIT_SUCCESS)
{
puts (dest_name);
/* If we created a file, but then failed to output the file
name, we should clean up the mess before failing. */
if (!dry_run && ((stdout_closed = true), close_stream (stdout) != 0))
{
int saved_errno = errno;
remove (dest_name);
if (!suppress_file_err)
error (EXIT_FAILURE, saved_errno, _("write error"));
}
}
#ifdef lint
free (dest_name);
free (template);
#endif
exit (status);
}
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