tramp-completion-function-alist uses predefined files for user
and host name completion (see File name completion). For each
method, it keeps a set of configuration files and a function that can
parse that file. Each entry in
is of the form (method pair1 pair2 …).
Each pair is composed of (function file). function is responsible for extracting user names and host names from file for completion. There are two functions which access this variable:
This function returns the list of completion functions for method.
(tramp-get-completion-function "rsh") ⇒ ((tramp-parse-rhosts "/etc/hosts.equiv") (tramp-parse-rhosts "~/.rhosts"))
This function sets function-list as list of completion functions for method.
(tramp-set-completion-function "ssh" '((tramp-parse-sconfig "/etc/ssh_config") (tramp-parse-sconfig "~/.ssh/config"))) ⇒ ((tramp-parse-sconfig "/etc/ssh_config") (tramp-parse-sconfig "~/.ssh/config"))
The following predefined functions parsing configuration files exist:
This function parses files which are syntactical equivalent to ~/.rhosts. It returns both host names and user names, if specified.
This function parses files which are syntactical equivalent to ~/.ssh/known_hosts. Since there are no user names specified in such files, it can return host names only.
This function returns the host nicknames defined by Host entries in ~/.ssh/config style files.
SSH2 parsing of directories /etc/ssh2/hostkeys/* and
~/ssh2/hostkeys/*. Hosts are coded in file names
hostkey_portnumber_host-name.pub. User names
Another SSH2 style parsing of directories like
/etc/ssh2/knownhosts/* and ~/ssh2/knownhosts/*. This
case, hosts names are coded in file names
host-name.algorithm.pub. User names are always
A function dedicated to /etc/hosts for host names.
A function which parses /etc/passwd for user names.
A function which parses /etc/group for group names.
A function which parses ~/.netrc and ~/.authinfo-style files.
To keep a custom file with custom data in a custom structure, a custom function has to be provided. This function must meet the following conventions:
file must be either a file on the host, or
function must return a list of (user host), which are
taken as candidates for completion for user and host names.
(my-tramp-parse "~/.my-tramp-hosts") ⇒ ((nil "toto") ("daniel" "melancholia"))