diff options
Diffstat (limited to 'lib/dpkg/db-ctrl-format.c')
| -rw-r--r-- | lib/dpkg/db-ctrl-format.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/lib/dpkg/db-ctrl-format.c b/lib/dpkg/db-ctrl-format.c new file mode 100644 index 0000000..34b5ff5 --- /dev/null +++ b/lib/dpkg/db-ctrl-format.c @@ -0,0 +1,157 @@ +/* + * 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(); +} |