updated year in copyright notice

the uid for each message in the maildir is now stored in a dbm database
rather than the filename.  this change was necessary because isync became
confused if you copied a message to another folder, in which case the uid
was invalid.

as a result of the above change, isync now acquires a mutex on the mailbox
to protect the dbm database from concurrent access.

main() was reworked to continue gracefully when an error is encountered, and
to always call maildir_close() so that the lock can be disabled, and the
database closed.

ChangeLog

@@ -1,5 +1,8 @@
 2001-11-20  me  <me@sigpipe.org>
 
+	* ChangeLog, Makefile.am, isync.spec:
+	post 0.7-release commit
+
 	* Makefile.am, NEWS, isync.1, isync.h, maildir.c, main.c:
 	added --create/-C command line option to force creation of the local
 	maildir-style mailbox if nonexistent

NEWS

@@ -1,3 +1,11 @@
+[0.8]
+
+IMPORTANT: In order to fix the problem where messages copied from one mailbox
+to another were not uploaded to the new mailbox, the way Isync stores the UID
+for each message needed to be changed.  As a result, you MUST delete all the
+messages in the local maildir box before using this version.  Otherwise it
+will upload every message to the server thinking its a new mail.
+
 [0.7]
 
 Added `MaxMessages' configuration option to allow tracking of only the most

TODO

@@ -4,3 +4,5 @@ add support for syncing with other: and shared: via NAMESPACE
 
 isync gets confused when new mail is delivered while in the middle of an
 IMAP session.  need to handled those asynchronous notifications properly.
+
+add a way to automatically create and sync IMAP subfolders.

config.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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

configure.in

@@ -1,5 +1,5 @@
 AC_INIT(isync.h)
-AM_INIT_AUTOMAKE(isync,0.7)
+AM_INIT_AUTOMAKE(isync,0.8)
 AM_PROG_CC_STDC
 AC_ARG_WITH(ssl-dir, [  --with-ssl-dir=DIR	location where openssl is insalled],
 	[if test -d $withval/lib; then
@@ -19,6 +19,7 @@ AC_CHECK_LIB(socket,socket)
 AC_CHECK_LIB(nsl,inet_ntoa)
 AC_CHECK_LIB(crypto,ERR_error_string)
 AC_CHECK_LIB(ssl,SSL_library_init)
+AC_CHECK_LIB(db,db_create)
 dnl test for gcc.  use the prefix so we know that gcc-3.0 is also gcc
 if test `echo $CC | sed 's/^gcc.*/gcc/'` = gcc; then
 	CFLAGS="$CFLAGS -pipe -W -Wall -Wshadow -Wmissing-prototypes"

cram.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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

imap.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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

isync.1

@@ -1,6 +1,6 @@
 .ig
 \" isync - IMAP4 to maildir mailbox synchronizer
-\" Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+\" Copyright (C) 2000-2 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
@@ -16,7 +16,7 @@
 \"  along with this program; if not, write to the Free Software
 \"  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 ..
-.TH isync 1 "2001 Nov 20"
+.TH isync 1 "2002 Jan 16"
 ..
 .SH NAME
 isync - synchronize IMAP4 and maildir mailboxes
@@ -304,13 +304,9 @@ will then use the global value by default.
 Default configuration file
 ..
 .SH BUGS
-maildir(5) states that readers should not attempt to parse the filename of a
-a message other than the :info field.  However, since
 .B isync
-relies on using the message UIDs that info must be inserted into the
+does not use NFS-safe locking.  It will correctly prevent concurrent
-filename in a way which will be interoperable with existing readers.  So
+synchronization of a mailbox on the same host, but not across NFS.
-the UID is placed in the filename of the messages in the local maildir
-mailbox rather than the :info field.
 .P
 When synchronizing multiple mailboxes on the same IMAP server, it is not
 possible to select different SSL options for each mailbox.  Only the options

isync.h

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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
@@ -18,11 +18,14 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#define DB_DBM_HSEARCH 1
+
 #include <sys/types.h>
 #include <stdarg.h>
 #if HAVE_LIBSSL
 #include <openssl/ssl.h>
 #endif
+#include <db.h>
 #include "debug.h"
 
 typedef struct
@@ -79,13 +82,13 @@ struct config
 /* struct representing local mailbox file */
 struct mailbox
 {
+    DBM *db;
     char *path;
     message_t *msgs;
+    int lockfd;
     unsigned int deleted;	/* # of deleted messages */
     unsigned int uidvalidity;
     unsigned int maxuid;	/* largest uid we know about */
-    unsigned int changed:1;
-    unsigned int maxuidchanged:1;
 };
 
 /* message dispositions */
@@ -106,7 +109,6 @@ struct message
     message_t *next;
     unsigned int processed:1;	/* message has already been evaluated */
     unsigned int new:1;		/* message is in the new/ subdir */
-    unsigned int changed:1;	/* flags changed */
     unsigned int dead:1;	/* message doesn't exist on the server */
     unsigned int wanted:1;	/* when using MaxMessages, keep this message */
 };
@@ -191,7 +193,8 @@ int imap_append_message (imap_t *, int, message_t *);
 mailbox_t *maildir_open (const char *, int flags);
 int maildir_expunge (mailbox_t *, int);
 int maildir_set_uidvalidity (mailbox_t *, unsigned int uidvalidity);
-int maildir_close (mailbox_t *);
+void maildir_close (mailbox_t *);
+int maildir_update_maxuid (mailbox_t * mbox);
 
 message_t * find_msg (message_t * list, unsigned int uid);
 void free_message (message_t *);

list.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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

maildir.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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
@@ -85,7 +85,7 @@ read_uid (const char *path, const char *file)
 {
     char full[_POSIX_PATH_MAX];
     int fd;
-    int ret;
+    int ret = 0;
     int len;
     char buf[64];
     unsigned int uid = 0;
@@ -96,29 +96,59 @@ read_uid (const char *path, const char *file)
     {
 	if (errno != ENOENT)
 	{
-	    perror ("open");
+	    perror (full);
 	    return -1;
 	}
 	return 0;		/* doesn't exist */
     }
-    ret = do_lock (fd, F_RDLCK);
+    len = read (fd, buf, sizeof (buf) - 1);
-    if (!ret)
+    if (len == -1)
     {
-	len = read (fd, buf, sizeof (buf) - 1);
+	perror ("read");
-	if (len == -1)
+	ret = -1;
-	    ret = -1;
+    }
-	else
+    else
-	{
+    {
-	    buf[len] = 0;
+	buf[len] = 0;
-	    uid = atol (buf);
+	uid = atol (buf);
-	}
     }
-    ret |= do_lock (fd, F_UNLCK);
     close (fd);
     return ret ? (unsigned int) ret : uid;
 
 }
 
+/* NOTE: this is NOT NFS safe */
+static int
+maildir_lock (mailbox_t * m)
+{
+    char path[_POSIX_PATH_MAX];
+
+    snprintf (path, sizeof (path), "%s/isynclock", m->path);
+    m->lockfd = open (path, O_WRONLY | O_CREAT | O_EXCL, S_IWUSR | S_IRUSR);
+    if (m->lockfd == -1)
+    {
+	perror (path);
+	return -1;
+    }
+    if (do_lock (m->lockfd, F_WRLCK))
+    {
+	close (m->lockfd);
+	return -1;
+    }
+    return 0;
+}
+
+static void
+maildir_unlock (mailbox_t * m)
+{
+    char path[_POSIX_PATH_MAX];
+
+    snprintf (path, sizeof (path), "%s/isynclock", m->path);
+    unlink (path);
+    do_lock (m->lockfd, F_UNLCK);
+    close (m->lockfd);
+}
+
 /* open a maildir mailbox.
  * if OPEN_FAST is set, we just check to make
  * sure its a valid mailbox and don't actually parse it.  any IMAP messages
@@ -141,8 +171,10 @@ maildir_open (const char *path, int flags)
     struct stat sb;
     const char *subdirs[] = { "cur", "new", "tmp" };
     int i;
+    datum key;
 
     m = calloc (1, sizeof (mailbox_t));
+    m->lockfd = -1;
     /* filename expansion happens here, not in the config parser */
     m->path = expand_strdup (path);
 
@@ -154,9 +186,7 @@ maildir_open (const char *path, int flags)
 	    {
 		fprintf (stderr, "ERROR: mkdir %s: %s (errno %d)\n",
 			 m->path, strerror (errno), errno);
-		free (m->path);
+		goto err;
-		free (m);
-		return NULL;
 	    }
 
 	    for (i = 0; i < 3; i++)
@@ -166,9 +196,7 @@ maildir_open (const char *path, int flags)
 		{
 		    fprintf (stderr, "ERROR: mkdir %s: %s (errno %d)\n",
 			     buf, strerror (errno), errno);
-		    free (m->path);
+		    goto err;
-		    free (m);
-		    return NULL;
 		}
 	    }
 
@@ -177,9 +205,7 @@ maildir_open (const char *path, int flags)
 	{
 	    fprintf (stderr, "ERROR: stat %s: %s (errno %d)\n", m->path,
 		     strerror (errno), errno);
-	    free (m->path);
+	    goto err;
-	    free (m);
-	    return NULL;
 	}
     }
     else
@@ -195,33 +221,37 @@ maildir_open (const char *path, int flags)
 		fprintf (stderr,
 			 "ERROR: %s does not appear to be a valid maildir style mailbox\n",
 			 m->path);
-		free (m->path);
+		goto err;
-		free (m);
-		return 0;
 	    }
 	}
     }
 
+    /* we need a mutex on the maildir because of the state files that isync
+     * uses.
+     */
+    if (maildir_lock (m))
+	goto err;
+
     /* check for the uidvalidity value */
     m->uidvalidity = read_uid (m->path, "isyncuidvalidity");
     if (m->uidvalidity == (unsigned int) -1)
-    {
+	goto err;
-	free (m->path);
-	free (m);
-	return NULL;
-    }
 
     /* load the current maxuid */
     if ((m->maxuid = read_uid (m->path, "isyncmaxuid")) == (unsigned int) -1)
-    {
+	goto err;
-	free (m->path);
-	free (m);
-	return NULL;
-    }
 
     if (flags & OPEN_FAST)
 	return m;
 
+    snprintf (buf, sizeof (buf), "%s/isyncuidmap", m->path);
+    m->db = dbm_open (buf, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
+    if (m->db == NULL)
+    {
+	fputs ("ERROR: unable to open UID db\n", stderr);
+	goto err;
+    }
+
     cur = &m->msgs;
     for (; count < 2; count++)
     {
@@ -231,10 +261,8 @@ maildir_open (const char *path, int flags)
 	d = opendir (buf);
 	if (!d)
 	{
-	    free (m->path);
-	    free (m);
 	    perror ("opendir");
-	    return 0;
+	    goto err;
 	}
 	while ((e = readdir (d)))
 	{
@@ -247,40 +275,25 @@ maildir_open (const char *path, int flags)
 	    p->flags = 0;
 	    p->new = (count == 0);
 
-	    /* filename format is something like:
+	    /* determine the UID for this message.  The basename (sans
-	     * <unique-prefix>,U=<n>:2,<flags>
+	     * flags) is used as the key in the db
-	     * This is completely non-standard, but in order for mail
-	     * clients to understand the flags, we have to use the
-	     * standard :info as described by the qmail spec
 	     */
-	    s = strstr (p->file, ",U=");
+	    strfcpy (buf, p->file, sizeof (buf));
-	    if (!s)
-		s = strstr (p->file, "UID");
-	    if (!s)
-		puts ("Warning, no UID for message");
-	    else
-	    {
-		p->uid = strtol (s + 3, &s, 10);
-		if (p->uid > m->maxuid)
-		{
-		    m->maxuid = p->uid;
-		    m->maxuidchanged = 1;
-		}
-		/* Courier-IMAP names it files
-		 *      unique,S=<size>:info
-		 * so we need to put the UID before the size, hence here
-		 * we check for a comma as a valid terminator as well,
-		 * since the format will be
-		 *      unique,U=<uid>,S=<size>:info
-		 */
-		if (*s && *s != ':' && *s != ',')
-		{
-		    puts ("Warning, unable to parse UID");
-		    p->uid = -1;	/* reset */
-		}
-	    }
-
 	    s = strchr (p->file, ':');
+	    if (s)
+		*s = 0;
+	    key.dptr = buf;
+	    key.dsize = strlen (buf);
+	    key = dbm_fetch (m->db, key);
+	    if (key.dptr)
+	    {
+		p->uid = *(int *) key.dptr;
+		if (p->uid > m->maxuid)
+		    m->maxuid = p->uid;
+	    }
+	    else
+		puts ("Warning, no UID for message");
+
 	    if (s)
 		parse_info (p, s + 1);
 	    if (p->flags & D_DELETED)
@@ -290,6 +303,15 @@ maildir_open (const char *path, int flags)
 	closedir (d);
     }
     return m;
+
+  err:
+    if (m->db)
+	dbm_close (m->db);
+    if (m->lockfd != -1)
+	maildir_unlock (m);
+    free (m->path);
+    free (m);
+    return NULL;
 }
 
 /* permanently remove messages from a maildir mailbox.  if `dead' is nonzero,
@@ -322,8 +344,8 @@ maildir_expunge (mailbox_t * mbox, int dead)
     return 0;
 }
 
-static int
+int
-update_maxuid (mailbox_t * mbox)
+maildir_update_maxuid (mailbox_t * mbox)
 {
     int fd;
     char buf[64];
@@ -355,7 +377,7 @@ update_maxuid (mailbox_t * mbox)
     uid = atol (buf);
     if (uid > mbox->maxuid)
     {
-	puts ("Error, maxuid is now higher (fatal)");
+	fputs ("ERROR: maxuid is now higher (fatal)\n", stderr);
 	ret = -1;
     }
 
@@ -429,48 +451,14 @@ maildir_clean_tmp (const char *mbox)
     }
 }
 
-int
+void
 maildir_close (mailbox_t * mbox)
 {
-    message_t *cur = mbox->msgs;
+    if (mbox->db)
-    char path[_POSIX_PATH_MAX];
+	dbm_close (mbox->db);
-    char oldpath[_POSIX_PATH_MAX];
-    char *p;
-    int ret = 0;
 
-    if (mbox->changed)
+    /* release the mutex on the mailbox */
-    {
+    maildir_unlock (mbox);
-	for (; cur; cur = cur->next)
-	{
-	    if (cur->changed)
-	    {
-		/* generate old path */
-		snprintf (oldpath, sizeof (oldpath), "%s/%s/%s",
-			  mbox->path, cur->new ? "new" : "cur", cur->file);
-
-		/* truncate old flags (if present) */
-		p = strchr (cur->file, ':');
-		if (p)
-		    *p = 0;
-
-		/* generate new path - always put this in the cur/ directory
-		 * because its no longer new
-		 */
-		snprintf (path, sizeof (path), "%s/cur/%s:2,%s%s%s%s",
-			  mbox->path,
-			  cur->file, (cur->flags & D_FLAGGED) ? "F" : "",
-			  (cur->flags & D_ANSWERED) ? "R" : "",
-			  (cur->flags & D_SEEN) ? "S" : "",
-			  (cur->flags & D_DELETED) ? "T" : "");
-
-		if (rename (oldpath, path))
-		    perror ("rename");
-	    }
-	}
-    }
-
-    if (mbox->maxuidchanged)
-	ret = update_maxuid (mbox);
 
     /* per the maildir(5) specification, delivery agents are supposed to
      * set a 24-hour timer on items placed in the `tmp' directory.
@@ -481,8 +469,6 @@ maildir_close (mailbox_t * mbox)
     free_message (mbox->msgs);
     memset (mbox, 0xff, sizeof (mailbox_t));
     free (mbox);
-
-    return ret;
 }
 
 int

main.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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
@@ -67,7 +67,7 @@ static void
 usage (void)
 {
     printf ("%s %s IMAP4 to maildir synchronizer\n", PACKAGE, VERSION);
-    puts ("Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>");
+    puts ("Copyright (C) 2000-2 Michael R. Elkins <me@mutt.org>");
     printf ("usage: %s [ flags ] mailbox [mailbox ...]\n", PACKAGE);
     puts ("  -a, --all	Synchronize all defined mailboxes");
     puts ("  -c, --config CONFIG	read an alternate config file (default: ~/.isyncrc)");
@@ -134,7 +134,7 @@ main (int argc, char **argv)
 {
     int i;
     config_t *box = 0;
-    mailbox_t *mail;
+    mailbox_t *mail = 0;
     imap_t *imap = 0;
     int expunge = 0;		/* by default, don't delete anything */
     int fast = 0;
@@ -250,6 +250,9 @@ main (int argc, char **argv)
 		if (!global.host)
 		{
 		    fprintf (stderr, "%s: no such mailbox\n", argv[optind]);
+		    /* continue is ok here because we are not handling the
+		     * `all' case.
+		     */
 		    continue;
 		}
 		global.path = argv[optind];
@@ -257,87 +260,99 @@ main (int argc, char **argv)
 	    }
 	}
 
-	if (!box->pass)
+	do {
-	{
+	    if (!box->pass)
-	    /* if we don't have a global password set, prompt the user for
-	     * it now.
-	     */
-	    if (!global.pass)
 	    {
-		global.pass = getpass ("Password:");
+		/* if we don't have a global password set, prompt the user for
+		 * it now.
+		 */
 		if (!global.pass)
 		{
-		    puts ("Aborting, no password");
+		    global.pass = getpass ("Password:");
-		    exit (1);
+		    if (!global.pass)
+		    {
+			fprintf (stderr, "Skipping %s, no password", box->path);
+			break;
+		    }
 		}
+		box->pass = strdup (global.pass);
 	    }
-	    box->pass = strdup (global.pass);
-	}
 
-	if (!quiet)
+	    if (!quiet)
-	    printf ("Reading %s\n", box->path);
+		printf ("Reading %s\n", box->path);
-	i = 0;
+	    i = 0;
-	if (fast)
+	    if (fast)
-	    i |= OPEN_FAST;
+		i |= OPEN_FAST;
-	if (create)
+	    if (create)
-	    i |= OPEN_CREATE;
+		i |= OPEN_CREATE;
-	mail = maildir_open (box->path, i);
+	    mail = maildir_open (box->path, i);
-	if (!mail)
+	    if (!mail)
-	{
-	    fprintf (stderr, "ERROR: unable to load mailbox %s\n", box->path);
-	    goto cleanup;
-	}
-
-	imap = imap_open (box, fast ? mail->maxuid + 1 : 1, imap);
-	if (!imap)
-	{
-	    fprintf (stderr, "%s: skipping mailbox due to IMAP error\n",
-		     box->path);
-	    goto cleanup;
-	}
-
-	if (!quiet)
-	    puts ("Synchronizing");
-	i = 0;
-	if (quiet)
-	    i |= SYNC_QUIET;
-	i |= (delete || box->delete) ? SYNC_DELETE : 0;
-	i |= (expunge || box->expunge) ? SYNC_EXPUNGE : 0;
-	if (sync_mailbox (mail, imap, i, box->max_size, box->max_messages))
-	    exit (1);
-
-	if (!fast)
-	{
-	    if ((expunge || box->expunge) && (imap->deleted || mail->deleted))
 	    {
-		/* remove messages marked for deletion */
+		fprintf (stderr, "%s: unable to open mailbox\n", box->path);
-		if (!quiet)
+		break;
-		    printf ("Expunging %d messages from server\n",
-			    imap->deleted);
-		if (imap_expunge (imap))
-		    exit (1);
-		if (!quiet)
-		    printf ("Expunging %d messages from local mailbox\n",
-			    mail->deleted);
-		if (maildir_expunge (mail, 0))
-		    exit (1);
 	    }
-	    /* remove messages deleted from server.  this can safely be an
-	     * `else' clause since dead messages are marked as deleted by
-	     * sync_mailbox.
-	     */
-	    else if (delete)
-		maildir_expunge (mail, 1);
-	}
 
-	/* write changed flags back to the mailbox */
+	    imap = imap_open (box, fast ? mail->maxuid + 1 : 1, imap);
-	if (!quiet)
+	    if (!imap)
-	    printf ("Committing changes to %s\n", mail->path);
+	    {
+		fprintf (stderr, "%s: skipping mailbox due to IMAP error\n",
+			 box->path);
+		break;
+	    }
 
-	if (maildir_close (mail))
+	    if (!quiet)
-	    exit (1);
+		puts ("Synchronizing");
+	    i = 0;
+	    if (quiet)
+		i |= SYNC_QUIET;
+	    i |= (delete || box->delete) ? SYNC_DELETE : 0;
+	    i |= (expunge || box->expunge) ? SYNC_EXPUNGE : 0;
+	    if (sync_mailbox (mail, imap, i, box->max_size, box->max_messages))
+	    {
+		imap_close (imap); /* Just to be safe.  Don't really know
+				    * what the problem was.
+				    */
+		break;
+	    }
 
-      cleanup:
+	    if (!fast)
+	    {
+		if ((expunge || box->expunge) &&
+		    (imap->deleted || mail->deleted))
+		{
+		    /* remove messages marked for deletion */
+		    if (!quiet)
+			printf ("Expunging %d messages from server\n",
+				imap->deleted);
+		    if (imap_expunge (imap))
+		    {
+			imap_close (imap);
+			imap = NULL;
+			break;
+		    }
+		    if (!quiet)
+			printf ("Expunging %d messages from local mailbox\n",
+				mail->deleted);
+		    if (maildir_expunge (mail, 0))
+			break;
+		}
+		/* remove messages deleted from server.  this can safely be an
+		 * `else' clause since dead messages are marked as deleted by
+		 * sync_mailbox.
+		 */
+		else if (delete)
+		    maildir_expunge (mail, 1);
+	    }
+
+	} while (0);
+
+	/* we never sync the same mailbox twice, so close it now */
+	if (mail)
+	    maildir_close (mail);
+
+	/* the imap connection is not closed so we can keep the connection
+	 * open, and there is no IMAP command for un-SELECT-ing a mailbox.
+	 */
 	if (all)
 	    box = box->next;
     }

sync.c

@@ -1,7 +1,7 @@
 /* $Id$
  *
  * isync - IMAP4 to maildir mailbox synchronizer
- * Copyright (C) 2000-1 Michael R. Elkins <me@mutt.org>
+ * Copyright (C) 2000-2 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
@@ -40,6 +40,24 @@ find_msg (message_t * list, unsigned int uid)
     return 0;
 }
 
+static int set_uid (DBM *db, const char *f, unsigned int uid)
+{
+    char path[_POSIX_PATH_MAX];
+    char *s;
+    datum key, val;
+
+    strfcpy (path, f, sizeof (path));
+    s = strchr (path, ':');
+    if (s)
+	*s = 0;
+    key.dptr = path;
+    key.dsize = strlen (path);
+    val.dptr = (void*) &uid;
+    val.dsize = sizeof (uid);
+    dbm_store (db, key, val, DBM_REPLACE);
+    return 0;
+}
+
 int
 sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
 	      unsigned int max_size, unsigned int max_msgs)
@@ -76,7 +94,8 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
     if (mbox->maxuid == 0 || imap->maxuid > mbox->maxuid)
     {
 	mbox->maxuid = imap->maxuid;
-	mbox->maxuidchanged = 1;
+	if (maildir_update_maxuid (mbox))
+	    return -1;
     }
 
     /* if we are --fast mode, the mailbox wont have been loaded, so
@@ -93,7 +112,6 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
 	    if (cur->uid == (unsigned int) -1)
 	    {
 		struct stat sb;
-		int uid;
 
 		if ((flags & SYNC_QUIET) == 0)
 		{
@@ -132,35 +150,12 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
 		}
 
 		cur->size = sb.st_size;
-
+		cur->uid = imap_append_message (imap, fd, cur);
-		uid = imap_append_message (imap, fd, cur);
+		/* if the server gave us back a uid, update the db */
+		if (cur->uid != (unsigned int) -1)
+		    set_uid (mbox->db, cur->file, cur->uid);
 
 		close (fd);
-
-		/* if the server gave us back a uid, rename the file so
-		 * we remember for next time
-		 */
-		if (uid != -1)
-		{
-		    strfcpy (newpath, path, sizeof (newpath));
-		    /* kill :info field */
-		    p = strchr (newpath, ':');
-		    if (p)
-			*p = 0;
-
-		    /* XXX not quite right, should really always put the
-		     * msg in "cur/", but i'm too tired right now.
-		     */
-		    snprintf (newpath + strlen (newpath),
-			      sizeof (newpath) - strlen (newpath),
-			      ",U=%d:2,%s%s%s%s", uid,
-			      (cur->flags & D_FLAGGED) ? "F" : "",
-			      (cur->flags & D_ANSWERED) ? "R" : "",
-			      (cur->flags & D_SEEN) ? "S" : "",
-			      (cur->flags & D_DELETED) ? "T" : "");
-		    if (rename (path, newpath))
-			perror ("rename");
-		}
 	    }
 	    else if (flags & SYNC_DELETE)
 	    {
@@ -187,7 +182,7 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
 	    if (imap_copy_message (imap, cur->uid,
 				   imap->box->copy_deleted_to))
 	    {
-		printf ("Error, unable to copy deleted message to \"%s\"\n",
+		fprintf (stderr, "ERROR: unable to copy deleted message to \"%s\"\n",
 			imap->box->copy_deleted_to);
 		return -1;
 	    }
@@ -208,8 +203,28 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int 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;
+	    /* generate old path */
+	    snprintf (path, sizeof (path), "%s/%s/%s",
+		      mbox->path, cur->new ? "new" : "cur", cur->file);
+
+	    /* truncate old flags (if present) */
+	    p = strchr (cur->file, ':');
+	    if (p)
+		*p = 0;
+
+	    /* generate new path - always put this in the cur/ directory
+	     * because its no longer new
+	     */
+	    snprintf (newpath, sizeof (newpath), "%s/cur/%s:2,%s%s%s%s",
+		      mbox->path,
+		      cur->file, (cur->flags & D_FLAGGED) ? "F" : "",
+		      (cur->flags & D_ANSWERED) ? "R" : "",
+		      (cur->flags & D_SEEN) ? "S" : "",
+		      (cur->flags & D_DELETED) ? "T" : "");
+
+	    if (rename (path, newpath))
+		perror ("rename");
 	}
     }
 
@@ -289,15 +304,15 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
 	    for (;;)
 	    {
 		/* create new file */
-		snprintf (path, sizeof (path), "%s/tmp/%ld_%d.%d.%s,U=%d%s",
+		snprintf (path, sizeof (path), "%s/tmp/%ld_%d.%d.%s%s",
 			  mbox->path, time (0), MaildirCount++, getpid (),
-			  Hostname, cur->uid, suffix);
+			  Hostname, suffix);
 
 		if ((fd = open (path, O_WRONLY | O_CREAT | O_EXCL, 0600)) > 0)
 		    break;
 		if (errno != EEXIST)
 		{
-		    perror ("open");
+		    perror (path);
 		    break;
 		}
 
@@ -336,6 +351,11 @@ sync_mailbox (mailbox_t * mbox, imap_t * imap, int flags,
 		 */
 		if (link (path, newpath))
 		    perror ("link");
+		else
+		{
+		    /* update the db with the UID mapping for this file */
+		    set_uid (mbox->db, newpath, cur->uid);
+		}
 	    }
 
 	    /* always remove the temp file */