Potential bug report: Cannot use ":args" option via Pigeonhole Sieve pipe plugin

[Zeeshan Muhammad]

Hi all,

Following the instructions noted at
http://wiki2.dovecot.org/Pigeonhole/Sieve/Plugins/Pipe , I am trying to
make use of the Pigeonhole sieve pipe plugin to execute an application with
custom arguments via my test sieve script:

require ["vnd.dovecot.pipe"];
if address :is "to" "test at example.com" {
  pipe :args [ "first-arg", "second-arg" ] "sieve-pipe-example";
}

I am editing my test sieve script via Mozilla Thunderbird v45.1.1 using the
Sieve email-client addon (v0.2.3h, see
https://github.com/thsmi/sieve#releases and
https://addons.mozilla.org/en-US/thunderbird/addon/sieve/ )

When I attempt to save the example sieve script above, I get the following
error returned by ManageSieve via Mozilla Thunderbird's Sieve addon:

"The script could not be saved:
Sieve mail filter: line 3: error: unknown tagged argument ':args' for the
pipe command (reported only once at first occurrence).
Sieve mail filter: error: validation failed."

I have setup sieve-pipe-example as follows in my 90-sieve.conf
configuration:

service sieve-pipe-script {
  executable = script /usr/bin/echo
  user = dovenull

  # socket name is program-name in Sieve
  unix_listener sieve-pipe-example {
  }
}

I cannot see where I am going wrong. I have combed through the
specification at
http://hg.rename-it.nl/dovecot-2.2-pigeonhole/raw-file/tip/doc/rfc/spec-bosch-sieve-extprograms.txt
as well as the official Dovecot/Pigeonhole wiki-pages and cannot find a
solution.

If I omit the :args option (and the arguments array), the sieve script
successfully gets accepted by ManageSieve.

Am I encountering a potential bug or am I doing something silly in my test
setup?

# Dovecot version: v2.2.24
# Pigeonhole version: v0.4.14
# Operating system: CentOS Linux release 7.2.1511 (Core)
# CPU architecture: x86_64

# Dovecot -n output (I have filtered my IP addresses and mail server's
FQDN):

# 2.2.24 (a82c823): /usr/local/etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.14 (099a97c)
# OS: Linux 3.10.0-327.18.2.el7.x86_64 x86_64 CentOS Linux release 7.2.1511
(Core)
auth_default_realm = example.com
base_dir = /var/run/dovecot/
default_login_user = vpopmail
first_valid_uid = 500
info_log_path = /dev/stderr
last_valid_uid = 500
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
log_path = /dev/stderr
mail_debug = yes
mail_location = maildir:~/Maildir
mail_max_userip_connections = 20
mail_plugins = " fts fts_lucene"
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags
copy include variables body enotify environment mailbox date index ihave
duplicate mime foreverypart extracttext editheader vnd.dovecot.pipe
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  driver = vpopmail
}
plugin {
  fts = lucene
  fts_autoindex = yes
  fts_lucene = whitespace_chars=@.
  sieve = file:~/sieve;active=~/.dovecot.sieve
  sieve_execute_socket_dir = sieve-execute
  sieve_extensions = +editheader +vnd.dovecot.pipe
  sieve_pipe_socket_dir = sieve-pipe
  sieve_plugins = sieve_extprograms
}
protocols = imap pop3 sieve
service auth {
  unix_listener auth-userdb {
    group = vchkpw
    mode = 0666
    user = vpopmail
  }
}
service imap-login {
  inet_listener imap {
    address = 127.0.0.1
    port = 143
    ssl = no
  }
  inet_listener imaps {
    address = 192.168.1.1
    port = 993
    ssl = yes
  }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  inet_listener pop3 {
    address = 127.0.0.1
    port = 110
    ssl = no
  }
  inet_listener pop3s {
    address = 192.168.1.1
    port = 995
    ssl = yes
  }
}
service sieve-pipe-script {
  executable = script /usr/bin/echo
  group = dovenull
  user = dovenull
}
ssl_cert = </etc/ssl/certs/example.com.crt
ssl_key = </etc/ssl/certs/example.com.key
ssl_protocols = !SSLv2 !SSLv3
userdb {
  driver = vpopmail
}
verbose_proctitle = yes
protocol lda {
  hostname = mail.example.com
  info_log_path = /var/log/dovecot/dovecot-lda.log
  log_path = /var/log/dovecot/dovecot-lda-errors.log
  mail_plugins = " fts fts_lucene sieve"
  postmaster_address = postmaster at example.com
}
protocol imap {
  mail_plugins = " fts fts_lucene imap_zlib"
}