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/***************************************************************************
* CVSID: $Id$
*
* probe-lsb-release.c : Probe LSB information
*
* Copyright (C) 2010 Danny Kukawka, <danny.kukawka@web.de>
*
* Licensed under the Academic Free License version 2.1
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
**************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "libhal/libhal.h"
#include "../../logger.h"
#define strbegin(buf, str) (strncmp (buf, str, strlen (str)) == 0)
/* global */
static char *udi = NULL;
static LibHalContext *ctx = NULL;
/**
* setstr:
* @buf: The non tabbed prefixed, null terminated string
* @str: The strings to compare with e.g. "Vendor:"
* @prop: The HAL property to set
*
* Returns: TRUE is found, FALSE otherwise.
*
* Finds the start of a null terminated string and sets HAL
* property if valid.
*/
static int
setstr (char *buf, char *str, char *prop)
{
DBusError error;
char *value;
dbus_error_init (&error);
if (buf[strlen(buf)-1] == '\n')
buf[strlen(buf)-1] = '\0';
value = buf + strlen (str) + 1;
if (strcmp (value, "n/a") == 0)
goto out;
if (!libhal_device_set_property_string (ctx, udi, prop, value, &error))
dbus_error_init (&error);
HAL_DEBUG (("Setting %s='%s'", prop, value));
return TRUE;
out:
return FALSE;
}
/**
* main:
* @argc: Number of arguments given to program
* @argv: Arguments given to program
*
* Returns: Return code
*
* Main entry point
*/
int
main (int argc, char *argv[])
{
int ret;
DBusError error;
char buf[512];
int lsbpipe[2];
int nullfd;
FILE *f;
uint i;
struct stat s;
const char *path = NULL;
const char *possible_paths[] = {
"/usr/bin/lsb_release",
"/bin/lsb_release",
"/sbin/lsb_release",
"/usr/local/bin/lsb_release",
};
/* assume failure */
ret = 1;
setup_logger ();
dbus_error_init (&error);
udi = getenv ("UDI");
if (udi == NULL) {
HAL_ERROR (("UDI not set"));
goto out;
}
if ((ctx = libhal_ctx_init_direct (&error)) == NULL) {
HAL_ERROR (("ctx init failed"));
goto out;
}
/* find the path to lsb_release */
for (i = 0; i < sizeof (possible_paths) / sizeof (char *); i++) {
if (stat (possible_paths[i], &s) == 0 && S_ISREG (s.st_mode)) {
path = possible_paths[i];
break;
}
}
if (path == NULL) {
HAL_ERROR(("Could not find lsb_release, exit!"));
exit(1);
}
if(pipe (lsbpipe) == -1) {
HAL_ERROR(("Could not create pipe (error: '%s'), exit!", strerror(errno)));
exit(1);
}
if ((f = fdopen (lsbpipe[0], "r")) == NULL) {
HAL_ERROR(("Could not open file (error: '%s'), exit!", strerror(errno)));
exit(1);
}
if ((nullfd = open ("/dev/null", O_RDONLY)) == -1){
HAL_ERROR(("Could not open /dev/null (error: '%s'), exit!", strerror(errno)));
exit(1);
}
/* fork the child process */
switch (fork ()) {
case 0:
/* child */
dup2 (nullfd, STDIN_FILENO);
dup2 (lsbpipe[1], STDOUT_FILENO);
close (lsbpipe[0]);
close (lsbpipe[1]);
/* execute the child */
execl (path, path, "-a", NULL);
/* throw an error if we ever reach this point */
HAL_ERROR (("Failed to execute lsb_release!"));
exit (1);
break;
case -1:
HAL_ERROR (("Cannot fork!"));
goto out;
}
/* parent continues from here */
/* close unused descriptor */
close (lsbpipe[1]);
/* read the output of the child */
while(fgets (buf, sizeof(buf), f) != NULL)
{
HAL_DEBUG (("probe-lsb-release, got line: '%s'", buf));
if (strbegin (buf, "LSB Version:")) {
setstr (buf, "LSB Version:", "system.lsb.version");
} else if (strbegin (buf, "Distributor ID:")) {
setstr (buf, "Distributor ID:", "system.lsb.distributor_id");
} else if (strbegin (buf, "Description:")) {
setstr (buf, "Description:", "system.lsb.description");
} else if (strbegin (buf, "Release:")) {
setstr (buf, "Release:", "system.lsb.release");
} else if (strbegin (buf, "Codename:")) {
setstr (buf, "Codename:", "system.lsb.codename");
}
/* return success only if there was something usefull to parse */
ret = 0;
}
/* as read to EOF, close */
fclose (f);
out:
LIBHAL_FREE_DBUS_ERROR (&error);
/* free ctx */
if (ctx != NULL) {
libhal_ctx_shutdown (ctx, &error);
LIBHAL_FREE_DBUS_ERROR (&error);
libhal_ctx_free (ctx);
}
return ret;
}
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