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DEFINITIONS
This source file includes following definitions.
- hash_print_key
- compare_major_minor
- find_highest_version
- unmangle_libtool
- get_dir_of_binary
- get_candidates
- main
/* GStreamer
* Copyright (C) 2004 Thomas Vander Stichele <thomas@apestaart.org>
*
* gst-run.c: tool to launch GStreamer tools with correct major/minor
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <glib.h>
/* global statics for option parsing */
static gboolean _print = FALSE;
static gchar *_arg_mm = NULL;
static gboolean _arg_list_mm = FALSE;
/* popt options table for the wrapper */
static GOptionEntry wrapper_options[] = {
{"print", 'p', 0, G_OPTION_ARG_NONE, &_print,
"print wrapped command line options", NULL},
{"gst-mm", 0, 0, G_OPTION_ARG_STRING, &_arg_mm,
"Force major/minor version", "VERSION"},
{"gst-list-mm", 0, 0, G_OPTION_ARG_NONE, &_arg_list_mm,
"List found major/minor versions", NULL},
{NULL}
};
/* print out the major/minor, which is the hash key */
static void
hash_print_key (gchar * key, gchar * value)
{
g_print ("%s\n", (gchar *) key);
}
/* return value like strcmp, but compares major/minor numerically */
static gint
compare_major_minor (const gchar * first, const gchar * second)
{
gchar **firsts, **seconds;
gint fmaj, fmin, smaj, smin;
gint ret = 0;
firsts = g_strsplit (first, ".", 0);
seconds = g_strsplit (second, ".", 0);
if (firsts[0] == NULL || firsts[1] == NULL) {
ret = -1;
goto beach;
}
if (seconds[0] == NULL || seconds[1] == NULL) {
ret = 1;
goto beach;
}
fmaj = atoi (firsts[0]);
fmin = atoi (firsts[1]);
smaj = atoi (seconds[0]);
smin = atoi (seconds[1]);
if (fmaj < smaj) {
ret = -1;
goto beach;
}
if (fmaj > smaj) {
ret = 1;
goto beach;
}
/* fmaj == smaj */
if (fmin < smin) {
ret = -1;
goto beach;
}
if (fmin > smin) {
ret = 1;
goto beach;
}
ret = 0;
beach:
g_strfreev (firsts);
g_strfreev (seconds);
return ret;
}
static void
find_highest_version (gchar * key, gchar * value, gchar ** highest)
{
if (*highest == NULL) {
/* first value, so just set it */
*highest = key;
}
if (compare_major_minor (key, *highest) > 0)
*highest = key;
}
/* Libtool creates shell scripts named "base" that calls actual binaries as
* .libs/lt-base. If we detect this is a libtool script, unmangle so we
* find the right binaries */
static void
unmangle_libtool (gchar ** dir, gchar ** base)
{
gchar *new_dir, *new_base;
if (!*dir)
return;
if (!*base)
return;
/* We assume libtool when base starts with "lt-" and dir ends with ".libs".
* On Windows libtool doesn't seem to be adding "lt-" prefix. */
#ifndef G_OS_WIN32
if (!g_str_has_prefix (*base, "lt-"))
return;
#endif
if (!g_str_has_suffix (*dir, ".libs"))
return;
#ifndef G_OS_WIN32
new_base = g_strdup (&((*base)[3]));
#else
new_base = g_strdup (*base);
#endif
new_dir = g_path_get_dirname (*dir);
g_free (*base);
g_free (*dir);
*base = new_base;
*dir = new_dir;
}
/* Returns a directory path that contains the binary given as an argument.
* If the binary given contains a path, it gets looked for in that path.
* If it doesn't contain a path, it gets looked for in the standard path.
*
* The returned string is newly allocated.
*/
static gchar *
get_dir_of_binary (const gchar * binary)
{
gchar *base, *dir;
gchar *full;
base = g_path_get_basename (binary);
dir = g_path_get_dirname (binary);
/* if putting these two together yields the same as binary,
* then we have the right breakup. If not, it's because no path was
* specified which caused get_basename to return "." */
full = g_build_filename (dir, base, NULL);
#ifdef G_OS_WIN32
/* g_build_filename() should be using the last path separator used in the
* input according to the docs, but doesn't actually do that, so we have
* to fix up the result. */
{
gchar *tmp;
for (tmp = (gchar *) binary + strlen (binary) - 1; tmp >= binary; tmp--) {
if (*tmp == '/' || *tmp == '\\') {
full[strlen (dir)] = *tmp;
break;
}
}
}
#endif
if (strcmp (full, binary) != 0) {
if (strcmp (dir, ".") != 0) {
g_warning ("This should not happen, g_path_get_dirname () has changed.");
g_free (base);
g_free (dir);
g_free (full);
return NULL;
}
/* we know no path was specified, so search standard path for binary */
g_free (full);
full = g_find_program_in_path (base);
if (!full) {
g_warning ("This should not happen, %s not in standard path.", base);
g_free (base);
g_free (dir);
return NULL;
}
}
g_free (base);
g_free (dir);
dir = g_path_get_dirname (full);
g_free (full);
return dir;
}
/* Search the given directory for candidate binaries matching the base binary.
* Return a GHashTable of major/minor -> directory pairs
*/
static GHashTable *
get_candidates (const gchar * dir, const gchar * base)
{
GDir *gdir;
GError *error = NULL;
const gchar *entry;
gchar *path;
gchar *suffix, *copy;
gchar *pattern;
GPatternSpec *spec, *specexe;
gchar **dirs;
gchar **cur;
GHashTable *candidates = NULL;
candidates = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
/* compile our pattern specs */
pattern = g_strdup_printf ("%s-*.*", base);
spec = g_pattern_spec_new (pattern);
g_free (pattern);
pattern = g_strdup_printf ("%s-*.*.exe", base);
specexe = g_pattern_spec_new (pattern);
g_free (pattern);
/* get all dirs from the path and prepend with given dir */
if (dir)
path = g_strdup_printf ("%s%c%s",
dir, G_SEARCHPATH_SEPARATOR, g_getenv ("PATH"));
else
path = (gchar *) g_getenv ("PATH");
dirs = g_strsplit (path, G_SEARCHPATH_SEPARATOR_S, 0);
if (dir)
g_free (path);
/* check all of these in reverse order by winding to bottom and going up */
cur = &dirs[0];
while (*cur)
++cur;
while (cur != &dirs[0]) {
--cur;
if (!g_file_test (*cur, G_FILE_TEST_EXISTS) ||
!g_file_test (*cur, G_FILE_TEST_IS_DIR)) {
continue;
}
gdir = g_dir_open (*cur, 0, &error);
if (!gdir) {
g_warning ("Could not open dir %s: %s", *cur, error->message);
g_error_free (error);
return NULL;
}
while ((entry = g_dir_read_name (gdir))) {
if (g_pattern_match_string (spec, entry)
|| g_pattern_match_string (specexe, entry)) {
gchar *full;
/* is it executable ? */
full = g_build_filename (*cur, entry, NULL);
if (!g_file_test (full, G_FILE_TEST_IS_EXECUTABLE)) {
g_free (full);
continue;
}
g_free (full);
/* strip base and dash from it */
suffix = g_strdup (&(entry[strlen (base) + 1]));
copy = g_strdup (suffix);
/* strip possible .exe from copy */
if (g_strrstr (copy, ".exe"))
g_strrstr (copy, ".exe")[0] = '\0';
/* stricter pattern check: check if it only contains digits or dots */
g_strcanon (copy, "0123456789.", 'X');
if (strstr (copy, "X")) {
g_free (suffix);
g_free (copy);
continue;
}
g_free (copy);
g_hash_table_insert (candidates, suffix, g_strdup (*cur));
}
}
}
g_strfreev (dirs);
g_pattern_spec_free (spec);
return candidates;
}
int
main (int argc, char **argv)
{
GHashTable *candidates;
gchar *dir;
gchar *base;
gchar *highest = NULL;
gchar *binary; /* actual binary we're going to run */
gchar *path = NULL; /* and its path */
gchar *desc;
GOptionContext *ctx;
GError *err = NULL;
/* detect stuff */
dir = get_dir_of_binary (argv[0]);
base = g_path_get_basename (argv[0]);
/* parse command line options */
desc = g_strdup_printf ("wrapper to call versioned %s", base);
ctx = g_option_context_new (desc);
g_free (desc);
g_option_context_set_ignore_unknown_options (ctx, TRUE);
g_option_context_add_main_entries (ctx, wrapper_options, GETTEXT_PACKAGE);
if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
g_print ("Error initializing: %s\n", err->message);
exit (1);
}
g_option_context_free (ctx);
/* unmangle libtool if necessary */
unmangle_libtool (&dir, &base);
#ifdef G_OS_WIN32
/* remove .exe suffix, otherwise we'll be looking for gst-blah.exe-*.* */
if (strlen (base) > 4 && g_str_has_suffix (base, ".exe")) {
base[strlen (base) - 4] = '\0';
}
#endif
/* get all candidate binaries */
candidates = get_candidates (dir, base);
g_free (dir);
if (_arg_mm) {
/* if a version was forced, look it up in the hash table */
dir = g_hash_table_lookup (candidates, _arg_mm);
if (!dir) {
g_print ("ERROR: Major/minor %s of tool %s not found.\n", _arg_mm, base);
return 1;
}
binary = g_strdup_printf ("%s-%s", base, _arg_mm);
} else {
highest = NULL;
/* otherwise, just look up the highest version */
if (candidates) {
g_hash_table_foreach (candidates, (GHFunc) find_highest_version,
&highest);
}
if (highest == NULL) {
g_print ("ERROR: No version of tool %s found.\n", base);
return 1;
}
dir = g_hash_table_lookup (candidates, highest);
binary = g_strdup_printf ("%s-%s", base, highest);
}
g_free (base);
path = g_build_filename (dir, binary, NULL);
g_free (binary);
/* print out list of major/minors we found if asked for */
/* FIXME: do them in order by creating a GList of keys and sort them */
if (_arg_list_mm) {
g_hash_table_foreach (candidates, (GHFunc) hash_print_key, NULL);
g_hash_table_destroy (candidates);
return 0;
}
/* print out command line if asked for */
argv[0] = path;
if (_print) {
int i;
for (i = 0; i < argc; ++i) {
g_print ("%s", argv[i]);
if (i < argc - 1)
g_print (" ");
}
g_print ("\n");
}
/* execute */
if (execv (path, argv) == -1) {
g_warning ("Error executing %s: %s (%d)", path, g_strerror (errno), errno);
}
g_free (path);
return 0;
}