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- /*
- * dpkg - main program for package management
- * divertdb.c - management of database of diverted files
- *
- * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
- * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@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 <string.h>
- #include <pwd.h>
- #include <grp.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <dpkg/i18n.h>
- #include <dpkg/dpkg.h>
- #include <dpkg/dpkg-db.h>
- #include "filesdb.h"
- #include "main.h"
- static struct diversion *diversions = NULL;
- static char *diversionsname;
- void
- ensure_diversions(void)
- {
- static struct stat sb_prev;
- struct stat sb_next;
- char linebuf[MAXDIVERTFILENAME];
- static FILE *file_prev;
- FILE *file;
- struct diversion *ov, *oicontest, *oialtname;
- if (diversionsname == NULL)
- diversionsname = dpkg_db_get_path(DIVERSIONSFILE);
- onerr_abort++;
- file = fopen(diversionsname, "r");
- if (!file) {
- if (errno != ENOENT)
- ohshite(_("failed to open diversions file"));
- } else {
- setcloexec(fileno(file), diversionsname);
- if (fstat(fileno(file), &sb_next))
- ohshite(_("failed to fstat diversions file"));
- /*
- * We need to keep the database file open so that the
- * filesystem cannot reuse the inode number (f.ex. during
- * multiple dpkg-divert invocations in a maintainer script),
- * otherwise the following check might turn true, and we
- * would skip reloading a modified database.
- */
- if (file_prev &&
- sb_prev.st_dev == sb_next.st_dev &&
- sb_prev.st_ino == sb_next.st_ino) {
- fclose(file);
- onerr_abort--;
- debug(dbg_general, "%s: same, skipping", __func__);
- return;
- }
- sb_prev = sb_next;
- }
- if (file_prev)
- fclose(file_prev);
- file_prev = file;
- for (ov = diversions; ov; ov = ov->next) {
- ov->useinstead->divert->camefrom->divert = NULL;
- ov->useinstead->divert = NULL;
- }
- diversions = NULL;
- if (!file) {
- onerr_abort--;
- debug(dbg_general, "%s: none, resetting", __func__);
- return;
- }
- debug(dbg_general, "%s: new, (re)loading", __func__);
- while (fgets_checked(linebuf, sizeof(linebuf), file, diversionsname) >= 0) {
- oicontest = nfmalloc(sizeof(struct diversion));
- oialtname = nfmalloc(sizeof(struct diversion));
- oialtname->camefrom = findnamenode(linebuf, 0);
- oialtname->useinstead = NULL;
- fgets_must(linebuf, sizeof(linebuf), file, diversionsname);
- oicontest->useinstead = findnamenode(linebuf, 0);
- oicontest->camefrom = NULL;
- fgets_must(linebuf, sizeof(linebuf), file, diversionsname);
- oicontest->pkgset = strcmp(linebuf, ":") ?
- pkg_db_find_set(linebuf) : NULL;
- oialtname->pkgset = oicontest->pkgset;
- if (oialtname->camefrom->divert ||
- oicontest->useinstead->divert)
- ohshit(_("conflicting diversions involving '%.250s' or '%.250s'"),
- oialtname->camefrom->name, oicontest->useinstead->name);
- oialtname->camefrom->divert = oicontest;
- oicontest->useinstead->divert = oialtname;
- oicontest->next = diversions;
- diversions = oicontest;
- }
- onerr_abort--;
- }
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