Provided by: syncmaildir_1.3.0-2build2_amd64 
NAME
smd - configuration file for smd-pull and smd-push
GENERAL SETUP
To generate a template config file run smd-pull(1) with the -t option. If no endpoint is specified, the
configuration file is named ~/.smd/config.default, otherwise it is named ~/.smd/config.endpoint. That
file is composed by the following fields
CLIENTNAME
name of the client host
SERVERNAME
name of the server host
MAILBOX
list of directories, separated by space
The field SERVERNAME must be a valid name for ssh, thus can be an alias like smd-server-foo. The default
configuration file contains an example of how to set up an alias for ssh.
The field CLIENTNAME is just an ID for the local host. If you plan to sync the same host with multiple
remote hosts, you MUST use different values for CLIENTNAME for every configuration file.
The field MAILBOX is a space separated list or roots that will be scanned for maildirs. Typically it is
just one directory name, Mail or Maildir. The roots must be paths relative to the home directory. In
the simplest case, the roots are named the same on both the local and the remote hosts.
If the roots have different names on the local and remote hosts, but their internal structure is the
same, the simplest solution is to just use a symlink on one of the two hosts so that a single name can be
used to refer to both.
If the internal sub folder structure differ, for example because on the remote hosts sub folders names
are prefixed with a dot but it is not the case on the local one, refer to the MAIL FOLDER RENAMING
section of this document.
The configuration file is a regular shell script, refer to bash(1) for its syntax.
HOOKS
The content of the directories ~/.smd/hooks/{pre,post}-pull.d/ is executed respectively before and after
smd-pull does it's job. They receive four arguments: "pre" or "post", "pull", the endpoint name and the
status. The status is always 0 (meaning success) for pre hooks, while can be 1 (for failure) for post
hooks. Hooks should not fail, if they do so then smd-pull will fail too.
The content of the directories ~/.smd/hooks/{pre,post}-push.d/ is executed respectively before and after
smd-push does it's job. They receive four arguments: "pre" or "post", "push", the endpoint name and the
status. The status is always 0 (meaning success) for pre hooks, while can be 1 (for failure) for post
hooks. Hooks should not fail, if they do so then smd-push will fail too.
MAIL FOLDER RENAMING
To make the transition from other synchronization tools smooth, the folders structure on the local and
remote host are allowed to differ. For example, offlineimap usually removes trailing dots from the names
of sub folders.
To take advantage of folder renaming, the configuration file can contain the following fields:
MAILBOX_LOCAL
the local roots of maildirs
MAILBOX_REMOTE
the remote roots of maildirs
TRANSLATOR_RL
a program to translate remote mailbox names to local ones
TRANSLATOR_LR
a program to translate local mailbox names to remote ones
The fields MAILBOX_LOCAL and MAILBOX_REMOTE must substitute the MAILBOX fields explained above.
The fields TRANSLATOR_RL and TRANSLATOR_LR must define two translator programs that will be run to
translate remote mailbox names to local ones (TRANSLATOR_RL) and vice versa (TRANSLATOR_LR). A
translator program must fulfil the following requirements:
• must be an absolute path or relative to the $HOME directory or in the user $PATH and must be
executable
• receives in standard input one or more paths starting with one of the roots listed in MAILBOX_LOCAL
(for TRANSLATOR_LR) or MAILBOX_REMOTE (for TRANSLATOR_RL) and ending with cur, new or tmp
• it can fail, returning 1 and writing on standard output the string ERROR followed by a new line and a
human readable error message in the following lines
• it can succeed, returning 0 and printing on standard output the corresponding translated paths
PATHS EXCLUSION
In case some paths need to be skipped, they can be specified as space separated glob(7) expressions in
the variable:
EXCLUDE
glob expressions identifying paths to be excluded
Note that these expressions must match real paths, no translation operation is applied to them, so it may
be necessary to specify different expressions for the local and remote endpoint. In that case the
following variables can be set:
EXCLUDE_LOCAL
glob expressions identifying local paths to be excluded
EXCLUDE_REMOTE
glob expressions identifying remote paths to be excluded
Matching is performed using fnmatch(3) with no special flags, thus `*' and `?' match any character
including `/'. Last, note that spaces in glob expressions must be replaced by %20. For example, to
exclude all paths matching the expression `Mail/delayed [1-5] days/*' the variable EXCLUDE must be set to
`Mail/delayed%20[1-5]%20days/*'
Last, matching is performed every time a directory is entered, and if the matching succeeds the directory
and all its subdirectories are skipped. Thus there is no need to specify a trailing '/*' in every
expression.
LOCAL SYNCHRONIZATION
If the local and remote mailboxes are on the same host the following option must be added to the
configuration file:
SMDCLIENTOPTS=-l
Note that this options has also the effect that ssh is not used. A a simple pair of pipes is used
instead.
DELETIONS
In some cases, usually unidirectional synchronizations, one may want to not propagate deletions. E.g. one
keeps a slim working mailbox but pushes to a backup mailbox to save every email. For that scenario smd-
pull and smd-push accept a -n, --no-delete, option. To avoid specifying this option every time one can
put it in the configuration file:
SMDSERVEROPTS=-n
FILES
~/.smd/config.* ~/.smd/hooks/pre-pull.d/ ~/.smd/hooks/post-pull.d/ ~/.smd/hooks/pre-push.d/
~/.smd/hooks/post-push.d/
SEE ALSO
mddiff(1), smd-server(1), smd-client(1), smd-push(1), smd-loop(1), smd-translate(1)
AUTHOR
Enrico Tassi <gares@fettunta.org>
01 April 2024 smd-config(5)