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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001, 2002, 2005,
2007, 2008, 2009 Free Software Foundation, Inc.
GNU Mailutils 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, or (at your option)
any later version.
GNU Mailutils 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 GNU Mailutils; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#ifdef __EXT_QNX
# undef __EXT_QNX
#endif
#include <unistd.h>
#include <mailutils/errno.h>
#include <mailutils/locker.h>
#include <mailutils/nls.h>
#include "mailutils/libargp.h"
const char *program_version = "GNU dotlock (" PACKAGE_STRING ")";
static char doc[] =
N_("GNU dotlock -- lock mail spool files")
"\v"
N_("Returns 0 on success, 3 if locking the file fails because\
it's already locked, and 1 if some other kind of error occurred.");
static char args_doc[] = N_("FILE");
static struct argp_option options[] = {
{"unlock", 'u', NULL, 0,
N_("unlock"), 0},
{"force", 'f', N_("MINUTES"), OPTION_ARG_OPTIONAL,
N_("forcibly break an existing lock older than a certain time"), 0},
{"retry", 'r', N_("RETRIES"), OPTION_ARG_OPTIONAL,
N_("retry the lock a few times"), 0},
{"debug", 'd', NULL, 0,
N_("print details of failure reasons to stderr"), 0},
{NULL, 0, NULL, 0, NULL, 0}
};
static error_t parse_opt (int key, char *arg, struct argp_state *state);
static struct argp argp = {
options,
parse_opt,
args_doc,
doc,
};
static const char *file;
static int unlock;
static int flags;
static int retries;
static time_t force;
static int debug;
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
static struct mu_argp_node_list lst;
switch (key)
{
case 'd':
mu_argp_node_list_new (&lst, "debug", "yes");
break;
case 'u':
unlock = 1;
break;
case 'r':
if (arg)
mu_argp_node_list_new (&lst, "retry", arg);
break;
case 'f':
mu_argp_node_list_new (&lst, "force", arg ? arg : "0");
break;
case ARGP_KEY_ARG:
if (file)
argp_error (state, _("only one FILE can be specified"));
file = arg;
break;
case ARGP_KEY_NO_ARGS:
if (!mu_help_config_mode)
argp_error (state, _("FILE must be specified"));
return ARGP_ERR_UNKNOWN;
case ARGP_KEY_INIT:
mu_argp_node_list_init (&lst);
break;
case ARGP_KEY_FINI:
mu_argp_node_list_finish (&lst, NULL, NULL);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
struct mu_cfg_param dotlock_cfg_param[] = {
{ "force", mu_cfg_time, &force, 0, NULL,
N_("Forcibly break an existing lock older than the specified time.") },
{ "retry", mu_cfg_int, &retries, 0, NULL,
N_("Number of times to retry acquiring the lock.") },
{ "debug", mu_cfg_bool, &debug, 0, NULL,
N_("Print details of failure reasons to stderr.") },
{ NULL }
};
const char *dotlock_capa[] = {
"license",
"common",
"debug",
NULL
};
int
main (int argc, char *argv[])
{
mu_locker_t locker = 0;
int err = 0;
pid_t usergid = getgid ();
pid_t mailgid = getegid ();
/* Native Language Support */
MU_APP_INIT_NLS ();
/* Drop permissions during argument parsing. */
if (setegid (usergid) < 0)
return MU_DL_EX_ERROR;
argp_err_exit_status = MU_DL_EX_ERROR;
mu_argp_init (program_version, NULL);
if (mu_app_init (&argp, dotlock_capa, dotlock_cfg_param,
argc, argv, 0, NULL, NULL))
exit (1);
if (force)
{
force *= 60;
flags |= MU_LOCKER_TIME;
}
if (retries != 0)
flags |= MU_LOCKER_RETRY;
if ((err = mu_locker_create (&locker, file, flags)))
{
if (debug)
mu_diag_funcall (MU_DIAG_ERROR, "mu_locker_create", NULL, err);
return MU_DL_EX_ERROR;
}
if (force != 0)
mu_locker_set_expire_time (locker, force);
if (retries != 0)
mu_locker_set_retries (locker, retries);
if (setegid (mailgid) < 0)
return MU_DL_EX_ERROR;
if (unlock)
err = mu_locker_remove_lock (locker);
else
err = mu_locker_lock (locker);
setegid(usergid);
mu_locker_destroy (&locker);
if (debug && err)
mu_error (unlock ? _("unlocking the file %s failed: %s") :
_("locking the file %s failed: %s"),
file, mu_strerror (err));
switch (err)
{
case 0:
err = MU_DL_EX_OK;
break;
case EPERM:
err = MU_DL_EX_PERM;
break;
case MU_ERR_LOCK_NOT_HELD:
err = MU_DL_EX_NEXIST;
break;
case MU_ERR_LOCK_CONFLICT:
err = MU_DL_EX_EXIST;
break;
default:
err = MU_DL_EX_ERROR;
break;
}
return err;
}
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