[Dovecot] unlink_directory(....Trash.NewFolder) failed: Directory not empty

[Adam McDougall]

I noticed the following this week.  No idea how long its been happening because I have
not tested deleting folders hardly at all.  Steps to reproduce:

1.  Create a folder "NewFolder", click on it in thunderbird so an index dir is created:

ls -ldi Maildir/.NewFolder/
1504062 drwx------  5 mcdouga9  egrstaff  4096 Nov 16 19:44 Maildir/.NewFolder/

ls -ldi Maildir/dovecot/boomhauer/private/indexes/.NewFolder/
4198832 drwx------  2 mcdouga9  egrstaff  4096 Nov 16 19:44 Maildir/dovecot/boomhauer/private/indexes/.NewFolder/

ls -li Maildir/dovecot/boomhauer/private/indexes/.NewFolder/
total 0
4198833 -rw-------  1 mcdouga9  egrstaff  128 Nov 16 19:44 dovecot.index.log


2.  Delete "NewFolder" which makes Thunderbird move both the folder under Trash, and seems to 
"rename" the .NewFolder index dir to .Trash.NewFolder (same inode #):
ls -ldi Maildir/.Trash.NewFolder/
1504062 drwx------  5 mcdouga9  egrstaff  4096 Nov 16 19:44 Maildir/.Trash.NewFolder/

ls -ldi Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder/
4198832 drwx------  2 mcdouga9  egrstaff  4096 Nov 16 19:44 Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder/

ls -li Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder/
total 4
4198833 -rw-------  1 mcdouga9  egrstaff  128 Nov 16 19:44 dovecot.index.log


3.  Right click on Trash folder in Thunderbird, choose "Empty Trash":

Nov 16 19:47:25 boomhauer dovecot: IMAP(mcdouga9): 
unlink_directory(/home/mcdouga9/Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder) failed: Directory not 
empty

ls -ldi Maildir/.Trash.NewFolder/
1504062 drwx------  5 mcdouga9  egrstaff  4096 Nov 16 19:44 Maildir/.Trash.NewFolder/

ls -ldi Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder/
4198832 drwx------  2 mcdouga9  egrstaff  4096 Nov 16 19:47 Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder/

ls -li Maildir/dovecot/boomhauer/private/indexes/.Trash.NewFolder/
(sometimes has a .nfs.blahblah file, I think I failed to catch it quick enough this time)

The folder dissapears from Thunderbird's view but stays on disk, and will reappear in Thunderbird
if you collapse and re-expand the folder tree, or close and open thunderbird.  Repeatable after more
"Empty Trash" or directly trying to delete the folder in thunderbird from in Trash.



# 1.1.beta8: /usr/local/etc/dovecot.conf
ssl_cert_file: /usr/local/etc/apache2/ssl/mail.egr.msu.edu.pem
ssl_key_file: /usr/local/etc/apache2/ssl/mail.egr.msu.edu.pem
login_dir: /var/run/dovecot/login
login_executable: /usr/local/libexec/dovecot/imap-login
verbose_proctitle: yes
first_valid_uid: 1000
first_valid_gid: 1000
mail_extra_groups: postlocal
mail_location: 
maildir:%h/Maildir:CONTROL=%h/Maildir/dovecot/private/control:INDEX=%h/Maildir/dovecot/%q/private/indexes
mmap_disable: yes
dotlock_use_excl: yes
mail_nfs_storage: yes
mail_nfs_index: yes
mail_plugins: acl fts fts_squat
mail_log_max_lines_per_sec: 0
imap_client_workarounds: delay-newmail netscape-eoh tb-extra-mailbox-sep
namespace:
  type: private
  separator: /
  inbox: yes
  list: yes
  subscriptions: yes
namespace:
  type: private
  separator: /
  prefix: mail/
  hidden: yes
  subscriptions: yes
namespace:
  type: private
  separator: /
  prefix: Mail/
  hidden: yes
  subscriptions: yes
namespace:
  type: public
  separator: /
  prefix: #shared/decs/
  location: 
maildir:/egr/mail/shared/decs:CONTROL=%h/Maildir/dovecot/public/control/decs:INDEX=%h/Maildir/dovecot/%q/public/indexes/decs
  list: yes
  subscriptions: yes
auth default:
  passdb:
    driver: pam
  userdb:
    driver: passwd
    args: system_user=
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 384
      user: postfix
      group: postfix
plugin:
  acl: vfile:/usr/local/etc/dovecot-acls:cache_secs=10
  fts: squat