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@@ -0,0 +1,134 @@
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+/*
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+ * dpkg - main program for package management
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+ * divertdb.c - management of database of diverted files
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+ *
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+ * Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
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+ * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@debian.org>
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+ *
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+ * This is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2,
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+ * or (at your option) any later version.
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+ *
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+ * This is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public
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+ * License along with dpkg; if not, write to the Free Software
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+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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+ */
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+
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+#include <config.h>
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+#include <compat.h>
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+
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+#include <dpkg-i18n.h>
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+
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+#include <assert.h>
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+#include <stdlib.h>
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+#include <unistd.h>
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+#include <fcntl.h>
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+#include <string.h>
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+#include <errno.h>
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+#include <sys/stat.h>
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+
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+#include <pwd.h>
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+#include <grp.h>
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+#include <sys/types.h>
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+
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+#include <dpkg.h>
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+#include <dpkg-db.h>
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+#include <dpkg-priv.h>
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+
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+#include "filesdb.h"
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+#include "main.h"
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+
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+static struct diversion *diversions = NULL;
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+static FILE *diversionsfile = NULL;
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+
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+void
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+ensure_diversions(void)
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+{
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+ static struct varbuf vb;
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+
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+ struct stat stab1, stab2;
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+ char linebuf[MAXDIVERTFILENAME];
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+ FILE *file;
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+ struct diversion *ov, *oicontest, *oialtname;
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+ int l;
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+
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+ varbufreset(&vb);
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+ varbufaddstr(&vb, admindir);
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+ varbufaddstr(&vb, "/" DIVERSIONSFILE);
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+ varbufaddc(&vb, 0);
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+
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+ onerr_abort++;
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+
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+ file = fopen(vb.buf,"r");
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+ if (!file) {
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+ if (errno != ENOENT)
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+ ohshite(_("failed to open diversions file"));
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+ if (!diversionsfile) {
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+ onerr_abort--;
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+ return;
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+ }
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+ } else if (diversionsfile) {
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+ if (fstat(fileno(diversionsfile), &stab1))
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+ ohshite(_("failed to fstat previous diversions file"));
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+ if (fstat(fileno(file), &stab2))
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+ ohshite(_("failed to fstat diversions file"));
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+ if (stab1.st_dev == stab2.st_dev &&
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+ stab1.st_ino == stab2.st_ino) {
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+ fclose(file);
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+ onerr_abort--;
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+ return;
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+ }
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+ }
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+ if (diversionsfile)
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+ fclose(diversionsfile);
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+ diversionsfile = file;
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+ setcloexec(fileno(diversionsfile), vb.buf);
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+
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+ for (ov = diversions; ov; ov = ov->next) {
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+ ov->useinstead->divert->camefrom->divert = NULL;
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+ ov->useinstead->divert = NULL;
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+ }
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+ diversions = NULL;
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+ if (!file) {
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+ onerr_abort--;
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+ return;
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+ }
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+
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+ while ((l = fgets_checked(linebuf, sizeof(linebuf), file, vb.buf)) >= 0) {
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+ oicontest = nfmalloc(sizeof(struct diversion));
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+ oialtname = nfmalloc(sizeof(struct diversion));
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+
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+ oialtname->camefrom = findnamenode(linebuf, 0);
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+ oialtname->useinstead = NULL;
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+
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+ fgets_must(linebuf, sizeof(linebuf), file, vb.buf);
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+ oicontest->useinstead = findnamenode(linebuf, 0);
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+ oicontest->camefrom = NULL;
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+
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+ fgets_must(linebuf, sizeof(linebuf), file, vb.buf);
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+ oicontest->pkg = oialtname->pkg = strcmp(linebuf, ":") ?
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+ findpackage(linebuf) : NULL;
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+
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+ if (oialtname->camefrom->divert ||
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+ oicontest->useinstead->divert)
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+ ohshit(_("conflicting diversions involving `%.250s' or `%.250s'"),
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+ oialtname->camefrom->name, oicontest->useinstead->name);
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+
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+ oialtname->camefrom->divert = oicontest;
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+ oicontest->useinstead->divert = oialtname;
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+
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+ oicontest->next = diversions;
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+ diversions = oicontest;
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+ }
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+ if (ferror(file))
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+ ohshite(_("read error in diversions [i]"));
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+
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+ onerr_abort--;
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+}
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+
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Guillem Jover