isync/sync.c

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/* $Id$
*
* isync - IMAP4 to maildir mailbox synchronizer
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* Copyright (C) 2000 Michael R. Elkins <me@mutt.org>
*
* This program 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 program 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
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#include "isync.h"
static unsigned int MaildirCount = 0;
message_t *
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find_msg (message_t * list, unsigned int uid)
{
for (; list; list = list->next)
if (list->uid == uid)
return list;
return 0;
}
int
sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags, unsigned int max_size)
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{
message_t *cur;
message_t *tmp;
char path[_POSIX_PATH_MAX];
char newpath[_POSIX_PATH_MAX];
char suffix[_POSIX_PATH_MAX];
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char *p;
int fd;
int ret;
int fetched = 0;
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if (mbox->uidvalidity > 0)
{
if (mbox->uidvalidity != imap->uidvalidity)
{
/* if the UIDVALIDITY value has changed, it means all our
* local UIDs are invalid, so we can't sync.
*/
puts ("Error, UIDVALIDITY changed on server (fatal)");
return -1;
}
}
else if (maildir_set_uidvalidity (mbox, imap->uidvalidity))
{
puts ("Error, unable to store UIDVALIDITY");
return -1;
}
if (mbox->maxuid == 0 || imap->maxuid > mbox->maxuid)
{
mbox->maxuid = imap->maxuid;
mbox->maxuidchanged = 1;
}
/* if we are --fast mode, the mailbox wont have been loaded, so
* this next step is skipped.
*/
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for (cur = mbox->msgs; cur; cur = cur->next)
{
tmp = find_msg (imap->msgs, cur->uid);
if (!tmp)
{
printf ("Warning, uid %d doesn't exist on server\n", cur->uid);
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if (flags & SYNC_DELETE)
{
cur->flags |= D_DELETED;
cur->dead = 1;
mbox->deleted++;
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}
continue;
}
tmp->processed = 1;
/* check if local flags are different from server flags.
* ignore \Recent and \Draft
*/
if (cur->flags != (tmp->flags & ~(D_RECENT | D_DRAFT)))
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{
/* set local flags that don't exist on the server */
if (!(tmp->flags & D_DELETED) && (cur->flags & D_DELETED))
imap->deleted++;
imap_set_flags (imap, cur->uid, cur->flags & ~tmp->flags);
/* update local flags */
if((cur->flags & D_DELETED) == 0 && (tmp->flags & D_DELETED))
mbox->deleted++;
cur->flags |= (tmp->flags & ~(D_RECENT | D_DRAFT));
cur->changed = 1;
mbox->changed = 1;
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}
}
fputs ("Fetching new messages", stdout);
fflush (stdout);
for (cur = imap->msgs; cur; cur = cur->next)
{
if (!cur->processed)
{
/* new message on server */
if ((flags & SYNC_EXPUNGE) && (cur->flags & D_DELETED))
{
/* this message has been marked for deletion and
* we are currently expunging a mailbox. don't
* bother downloading this message
*/
continue;
}
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if (max_size && cur->size > max_size)
{
printf ("Warning, message skipped because it is too big (%u)\n",
cur->size);
continue;
}
/* construct the flags part of the file name. */
*suffix = 0;
if (cur->flags)
{
snprintf (suffix, sizeof (suffix), ":2,%s%s%s%s",
(cur->flags & D_FLAGGED) ? "F" : "",
(cur->flags & D_ANSWERED) ? "R" : "",
(cur->flags & D_SEEN) ? "S" : "",
(cur->flags & D_DELETED) ? "T" : "");
}
for (;;)
{
/* create new file */
snprintf (path, sizeof (path), "%s/tmp/%s.%ld_%d.%d.UID%d%s",
mbox->path, Hostname, time (0), MaildirCount++,
getpid (), cur->uid, suffix);
if ((fd = open (path, O_WRONLY | O_CREAT | O_EXCL, 0600)) > 0)
break;
if (errno != EEXIST)
{
perror ("open");
break;
}
sleep (2);
}
if (fd < 0)
continue;
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/* give some visual feedback that something is happening */
fputs (".", stdout);
fflush (stdout);
fetched++;
ret = imap_fetch_message (imap, cur->uid, fd);
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if (close (fd))
perror ("close");
else if (!ret)
{
p = strrchr (path, '/');
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snprintf (newpath, sizeof (newpath), "%s/%s%s", mbox->path,
(cur->flags & D_SEEN) ? "cur" : "new", p);
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/* its ok if this fails, the next time we sync the message
* will get pulled down
*/
if (link (path, newpath))
perror ("link");
}
/* always remove the temp file */
unlink (path);
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}
}
printf (" %d messages\n", fetched);
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return 0;
}