gstreamer/tools/gstreamer-register.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstreamer-register.c: Plugin subsystem for loading elements, types, and libs
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gst/gst.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "config.h"
#define GLOBAL_REGISTRY_DIR GST_CONFIG_DIR
#define GLOBAL_REGISTRY_FILE GLOBAL_REGISTRY_DIR"/reg.xml"
#define GLOBAL_REGISTRY_FILE_TMP GLOBAL_REGISTRY_DIR"/.reg.xml.tmp"
#define REGISTRY_DIR_PERMS (S_ISGID | \
S_IRUSR | S_IWUSR | S_IXUSR | \
S_IRGRP | S_IXGRP | \
S_IROTH | S_IXOTH)
#define REGISTRY_TMPFILE_PERMS (S_IRUSR | S_IWUSR)
#define REGISTRY_FILE_PERMS (S_IRUSR | S_IWUSR | \
S_IRGRP | S_IWGRP | \
S_IROTH | S_IWOTH)
extern gboolean _gst_plugin_spew;
extern gboolean _gst_warn_old_registry;
static void error_perm() {
g_print("\n(%s)\n"
"Do you have the appropriate permissions?\n"
"You may need to be root to run this command.\n\n",
strerror(errno));
exit(1);
}
static void usage(const char *progname) {
g_print("usage: %s\n", progname);
g_print("Builds the plugin registry for gstreamer.\n");
g_print("This command will usually require superuser privileges.\n\n");
exit(0);
}
static int is_file(const char * filename) {
struct stat statbuf;
if(stat(filename, &statbuf)) return 0;
return S_ISREG(statbuf.st_mode);
}
static int is_dir(const char * filename) {
struct stat statbuf;
if(stat(filename, &statbuf)) return 0;
return S_ISDIR(statbuf.st_mode);
}
static void set_filemode(const char * filename, mode_t mode) {
if(chmod(filename, mode)) {
g_print("Cannot set file permissions on `%s' to %o", filename, mode);
error_perm();
}
}
static int get_filemode(const char * filename, mode_t * mode) {
struct stat statbuf;
if(stat(filename, &statbuf)) return 0;
*mode = statbuf.st_mode & ~ S_IFMT;
return 1;
}
static void move_file(const char * nameold,
const char * namenew,
mode_t * newmode) {
if (!is_file(nameold)) {
g_print("Temporary `%s' is not a file", nameold);
error_perm();
}
if (is_dir(namenew)) {
g_print("Destination path `%s' for registry file is a directory\n", namenew);
g_print("Please remove, or reconfigure GStreamer\n\n");
exit(1);
}
if (rename(nameold, namenew)) {
g_print("Cannot move `%s' to `%s'", nameold, namenew);
error_perm();
}
// set mode again, to make this public
set_filemode(namenew, *newmode);
}
static void make_dir(const char * dirname) {
mode_t mode = REGISTRY_DIR_PERMS;
if(mkdir(dirname, mode)) {
g_print("Cannot create GStreamer registry directory `%s'", dirname);
error_perm();
}
if(chmod(dirname, mode)) {
g_print("Cannot set permissions on GStreamer registry directory `%s' to %o", dirname, mode);
error_perm();
}
return;
}
static void check_dir(const char * dirname) {
if (!is_dir(dirname)) {
make_dir(dirname);
}
}
static void save_registry(const char *destfile,
xmlDocPtr * doc) {
mode_t tmpmode = REGISTRY_TMPFILE_PERMS;
#if 0
FILE *fp;
int fd;
fd = open(destfile, O_CREAT | O_TRUNC | O_WRONLY, tmpmode);
if (fd == -1) {
g_print("Cannot open `%s' to save new registry to.", destfile);
error_perm();
}
fp = fdopen (fd, "wb");
if (!fp) {
g_print("Cannot fopen `%s' to save new registry to.", destfile);
error_perm();
}
// set mode to make this private
set_filemode(destfile, tmpmode);
// FIXME: no way to check success of xmlDocDump, which is why
// this piece of code is ifdefed out.
// The version of libxml currently (Jan 2001) in their CVS tree fixes
// this problem.
xmlDocDump(fp, *doc);
if (!fclose(fp)) {
g_print("Cannot close `%s' having saved new registry.", destfile);
error_perm();
}
#else
if (xmlSaveFile(destfile, *doc) <= 0) {
g_print("Cannot save new registry to `%s'", destfile);
error_perm();
}
set_filemode(destfile, tmpmode);
#endif
}
int main(int argc,char *argv[])
{
xmlDocPtr doc;
// Mode of the file we're saving the repository to;
mode_t newmode;
// Get mode of old repository, or a default.
if (!get_filemode(GLOBAL_REGISTRY_FILE, &newmode)) {
mode_t theumask = umask(0);
umask(theumask);
newmode = REGISTRY_FILE_PERMS & ~ theumask;
}
// remove the old registry file first
// If this fails, we simply ignore it since we'll overwrite it later
// anyway.
unlink(GLOBAL_REGISTRY_FILE);
// Init gst
_gst_plugin_spew = TRUE;
_gst_warn_old_registry = FALSE;
gst_info_enable_category(GST_CAT_PLUGIN_LOADING);
gst_init(&argc,&argv);
// Check args
if (argc != 1) usage(argv[0]);
// Check that directory for config exists
check_dir(GLOBAL_REGISTRY_DIR);
// Read the plugins
doc = xmlNewDoc("1.0");
doc->xmlRootNode = xmlNewDocNode(doc, NULL, "GST-PluginRegistry", NULL);
gst_plugin_save_thyself(doc->xmlRootNode);
// Save the registry to a tmp file.
save_registry(GLOBAL_REGISTRY_FILE_TMP, &doc);
// Make the tmp file live.
move_file(GLOBAL_REGISTRY_FILE_TMP, GLOBAL_REGISTRY_FILE, &newmode);
return(0);
}