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/*
* dpkg - main program for package management
* divertdb.c - management of database of diverted files
*
* Copyright © 1995 Ian Jackson <ian@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,
* 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 dpkg; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <compat.h>
#include <dpkg/i18n.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include "filesdb.h"
#include "main.h"
static struct diversion *diversions = NULL;
static FILE *diversionsfile = NULL;
void
ensure_diversions(void)
{
static struct varbuf vb;
struct stat stab1, stab2;
char linebuf[MAXDIVERTFILENAME];
FILE *file;
struct diversion *ov, *oicontest, *oialtname;
int l;
varbufreset(&vb);
varbufaddstr(&vb, admindir);
varbufaddstr(&vb, "/" DIVERSIONSFILE);
varbufaddc(&vb, 0);
onerr_abort++;
file = fopen(vb.buf,"r");
if (!file) {
if (errno != ENOENT)
ohshite(_("failed to open diversions file"));
if (!diversionsfile) {
onerr_abort--;
return;
}
} else if (diversionsfile) {
if (fstat(fileno(diversionsfile), &stab1))
ohshite(_("failed to fstat previous diversions file"));
if (fstat(fileno(file), &stab2))
ohshite(_("failed to fstat diversions file"));
if (stab1.st_dev == stab2.st_dev &&
stab1.st_ino == stab2.st_ino) {
fclose(file);
onerr_abort--;
return;
}
}
if (diversionsfile)
fclose(diversionsfile);
diversionsfile = file;
setcloexec(fileno(diversionsfile), vb.buf);
for (ov = diversions; ov; ov = ov->next) {
ov->useinstead->divert->camefrom->divert = NULL;
ov->useinstead->divert = NULL;
}
diversions = NULL;
if (!file) {
onerr_abort--;
return;
}
while ((l = fgets_checked(linebuf, sizeof(linebuf), file, vb.buf)) >= 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, vb.buf);
oicontest->useinstead = findnamenode(linebuf, 0);
oicontest->camefrom = NULL;
fgets_must(linebuf, sizeof(linebuf), file, vb.buf);
oicontest->pkg = oialtname->pkg = strcmp(linebuf, ":") ?
findpackage(linebuf) : NULL;
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;
}
if (ferror(file))
ohshite(_("read error in diversions [i]"));
onerr_abort--;
}
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