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/***
This file is part of PulseAudio.
Copyright 2020 Igor V. Kovalenko <igor.v.kovalenko@gmail.com>
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <dirent.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include "database.h"
#include "core-error.h"
pa_database* pa_database_open(const char *path, const char *fn, bool prependmid, bool for_write) {
const char *filename_suffix = pa_database_get_filename_suffix();
char *machine_id = NULL, *filename_prefix, *full_path;
DIR *database_dir = NULL;
struct dirent *de;
pa_database *f;
pa_assert(filename_suffix && filename_suffix[0]);
if (prependmid && !(machine_id = pa_machine_id())) {
return NULL;
}
/* Database file name starts with ${machine_id}-${fn} */
if (machine_id)
filename_prefix = pa_sprintf_malloc("%s-%s", machine_id, fn);
else
filename_prefix = pa_xstrdup(fn);
/* Search for existing database directory entry name matching architecture suffix and filename suffix. */
database_dir = opendir(path);
if (database_dir) {
for (;;) {
errno = 0;
de = readdir(database_dir);
if (!de) {
if (errno) {
pa_log_warn("Unable to search for existing database file, readdir() failed: %s", pa_cstrerror(errno));
/* can continue as if there is no matching database file candidate */
}
break;
}
if (pa_startswith(de->d_name, filename_prefix)
&& de->d_name[strlen(filename_prefix)] == '.'
&& pa_endswith(de->d_name + strlen(filename_prefix) + 1, filename_suffix)) {
/* candidate filename found, replace filename_prefix with this one */
pa_log_debug("Found existing database file '%s/%s', using it", path, de->d_name);
pa_xfree(filename_prefix);
filename_prefix = pa_xstrndup(de->d_name, strlen(de->d_name) - strlen(filename_suffix));
break;
}
}
closedir(database_dir);
} else {
pa_log_warn("Unable to search for existing database file, failed to open directory %s: %s", path, pa_cstrerror(errno));
}
full_path = pa_sprintf_malloc("%s" PA_PATH_SEP "%s%s", path, filename_prefix, filename_suffix);
f = pa_database_open_internal(full_path, for_write);
if (f)
pa_log_info("Successfully opened '%s' database file '%s'.", fn, full_path);
else
pa_log("Failed to open '%s' database file '%s': %s", fn, full_path, pa_cstrerror(errno));
pa_xfree(full_path);
pa_xfree(filename_prefix);
/* deallocate machine_id if it was used to construct file name */
pa_xfree(machine_id);
return f;
}
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