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/*
* libdpkg - Debian packaging suite library routines
* db-ctrl-format.c - package control information database format
*
* Copyright © 2011-2014 Guillem Jover <guillem@debian.org>
*
* This 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 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, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/varbuf.h>
#include <dpkg/db-ctrl.h>
static enum pkg_infodb_format db_format = PKG_INFODB_FORMAT_UNKNOWN;
static bool db_upgrading;
static char *db_infodir;
static enum pkg_infodb_format
pkg_infodb_parse_format(const char *file)
{
FILE *fp;
unsigned int format;
fp = fopen(file, "r");
if (fp == NULL) {
/* A missing format file means legacy format (0). */
if (errno == ENOENT)
return PKG_INFODB_FORMAT_LEGACY;
ohshite(_("error trying to open %.250s"), file);
}
if (fscanf(fp, "%u", &format) != 1)
ohshit(_("corrupt info database format file '%s'"), file);
fclose(fp);
return format;
}
static enum pkg_infodb_format
pkg_infodb_read_format(void)
{
struct atomic_file *file;
struct stat st;
char *filename;
filename = dpkg_db_get_path(INFODIR "/format");
file = atomic_file_new(filename, 0);
db_format = pkg_infodb_parse_format(file->name);
/* Check if a previous upgrade got interrupted. Because we are only
* supposed to upgrade the db layout one format at a time, if the
* new file exists that means the new format is just one ahead,
* we don't try to read it because it contains unreliable data. */
if (stat(file->name_new, &st) == 0) {
db_format++;
db_upgrading = true;
}
atomic_file_free(file);
free(filename);
if (db_format < 0 || db_format >= PKG_INFODB_FORMAT_LAST)
ohshit(_("info database format (%d) is bogus or too new; "
"try getting a newer dpkg"), db_format);
return db_format;
}
enum pkg_infodb_format
pkg_infodb_get_format(void)
{
if (db_format > PKG_INFODB_FORMAT_UNKNOWN)
return db_format;
else
return pkg_infodb_read_format();
}
void
pkg_infodb_set_format(enum pkg_infodb_format version)
{
db_format = version;
}
bool
pkg_infodb_is_upgrading(void)
{
if (db_format < 0)
pkg_infodb_read_format();
return db_upgrading;
}
const char *
pkg_infodb_get_dir(void)
{
if (db_infodir == NULL)
db_infodir = dpkg_db_get_path(INFODIR);
return db_infodir;
}
const char *
pkg_infodb_get_file(const struct pkginfo *pkg, const struct pkgbin *pkgbin,
const char *filetype)
{
static struct varbuf vb;
enum pkg_infodb_format format;
/* Make sure to always read and verify the format version. */
format = pkg_infodb_get_format();
varbuf_reset(&vb);
varbuf_add_dir(&vb, pkg_infodb_get_dir());
varbuf_add_str(&vb, pkg->set->name);
if (pkgbin->multiarch == PKG_MULTIARCH_SAME &&
format == PKG_INFODB_FORMAT_MULTIARCH)
varbuf_add_archqual(&vb, pkgbin->arch);
varbuf_add_char(&vb, '.');
varbuf_add_str(&vb, filetype);
varbuf_end_str(&vb);
return vb.buf;
}
const char *
pkg_infodb_reset_dir(void)
{
free(db_infodir);
db_infodir = NULL;
return pkg_infodb_get_dir();
}
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