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clroot.ml
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clroot.ml
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(* Unison file synchronizer: src/clroot.ml *)
(* Copyright 1999-2010, Benjamin C. Pierce
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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
(*
This file parses the unison command-line arguments that
specify replicas. The syntax for replicas is based on that of
URI's, described in RFC 2396. They have the following grammar:
replica ::= [protocol:]//[user@][host][:port][/path]
| path
protocol ::= file
| socket
| ssh
| rsh
user ::= [-_a-zA-Z0-9]+
host ::= [-_a-zA-Z0-9.]+
port ::= [0-9]+
path is any string that does not begin with protocol: or //.
*)
(* Command-line roots *)
type clroot =
ConnectLocal of
string option (* root *)
| ConnectByShell of
string (* shell = "rsh" or "ssh" *)
* string (* name of host *)
* string option (* user name to log in as *)
* string option (* port *)
* string option (* root of replica in host fs *)
| ConnectBySocket of
string (* name of host *)
* string (* port where server should be listening *)
* string option (* root of replica in host fs *)
(* Internal datatypes used in parsing command-line roots *)
type protocol = File | Rsh | Socket | Ssh
type uri = protocol (* - a protocol *)
* string option (* - an optional user *)
* string option (* - an optional host *)
* int option (* - an optional port *)
* string option (* - an optional path *)
(* Regular expressions, used in parsing *)
let protocolColonSlashSlashRegexp = Str.regexp "[a-zA-Z]+://"
let protocolColonRegexp = Str.regexp "[a-zA-Z]+:"
let slashSlashRegexp = Str.regexp "//"
let getProtocolSlashSlash s =
if Str.string_match protocolColonSlashSlashRegexp s 0
then
let matched = Str.matched_string s in
let len = String.length matched in
let remainder = Str.string_after s len in
let protocolName = String.sub matched 0 (len-3) in
let protocol =
match protocolName with
"file" -> File
| "rsh" -> Rsh
| "socket" -> Socket
| "ssh" -> Ssh
| "unison" ->
raise(Invalid_argument
(Printf.sprintf "protocol unison has been deprecated, use file, ssh, rsh, or socket instead" ))
| _ ->
raise(Invalid_argument
(Printf.sprintf "unrecognized protocol %s" protocolName)) in
Some(protocol,remainder)
else if Str.string_match slashSlashRegexp s 0
then Some(File,String.sub s 2 (String.length s - 2))
else if Str.string_match protocolColonRegexp s 0
then
let matched = Str.matched_string s in
match matched with
"file:" | "ssh:" | "rsh:" | "socket:" ->
raise(Util.Fatal
(Printf.sprintf
"ill-formed root specification %s (%s must be followed by //)"
s matched))
| _ -> None
else None
let userAtRegexp = Str.regexp "[-_a-zA-Z0-9.]+@"
let getUser s =
if Str.string_match userAtRegexp s 0
then
let userAt = Str.matched_string s in
let len = String.length userAt in
let afterAt = Str.string_after s len in
let beforeAt = String.sub userAt 0 (len-1) in
(Some beforeAt,afterAt)
else (None,s)
let hostRegexp = Str.regexp "[-_a-zA-Z0-9.]+"
let getHost s =
if Str.string_match hostRegexp s 0
then
let host = Str.matched_string s in
let s' = Str.string_after s (String.length host) in
(Some host,s')
else (None,s)
let colonPortRegexp = Str.regexp ":[^/]+"
let getPort s =
if Str.string_match colonPortRegexp s 0
then
let colonPort = Str.matched_string s in
let len = String.length colonPort in
let port = String.sub colonPort 1 (len-1) in
let s' = Str.string_after s len in
(Some port,s')
else (None,s)
(* parseUri : string
-> protocol
* user option
* host option
* port option
* path option
where user, host, port, and path are strings,
and path is guaranteed to be non-empty
*)
let parseUri s =
match getProtocolSlashSlash s with
None ->
(File,None,None,None,Some s)
| Some(protocol,s0) ->
let (userOpt,s1) = getUser s0 in
let (hostOpt,s2) = getHost s1 in
let (portOpt,s3) = getPort s2 in
let pathOpt =
let len = String.length s3 in
if len <= 0 then None
else if String.get s3 0 = '/' then
if len=1 then None
else Some(String.sub s3 1 (len-1))
else
raise(Util.Fatal
(Printf.sprintf "ill-formed root specification %s" s)) in
(protocol,userOpt,hostOpt,portOpt,pathOpt)
(* These should succeed *)
let t1 = "socket://tjim@saul.cis.upenn.edu:4040/hello/world"
let t2 = "ssh://tjim@saul/hello/world"
let t3 = "rsh://saul:4040/hello/world"
let t4 = "rsh://saul/hello/world"
let t5 = "rsh://saul"
let t6 = "rsh:///hello/world"
let t7 = "///hello/world"
let t8 = "//raptor/usr/local/bin"
let t9 = "file://raptor/usr/local/bin"
let t9 = "//turtle/c:/winnt/"
let t9 = "file://turtle/c:/winnt/"
(* These should fail *)
let b1 = "//saul:40a4/hello"
let b2 = "RSH://saul/hello"
let b3 = "rsh:/saul/hello"
let b4 = "//s%aul/hello"
let cannotAbbrevFileRx = Rx.rx "(file:|ssh:|rsh:|socket:).*"
let networkNameRx = Rx.rx "//.*"
(* Main external printing function *)
let clroot2string = function
ConnectLocal None -> "."
| ConnectLocal(Some s) ->
if Rx.match_string cannotAbbrevFileRx s
then if Rx.match_string networkNameRx s
then Printf.sprintf "file:%s" s
else Printf.sprintf "file:///%s" s
else s
| ConnectBySocket(h,p,s) ->
Printf.sprintf "socket://%s:%s/%s" h p
(match s with None -> "" | Some x -> x)
| ConnectByShell(sh,h,u,p,s) ->
let user = match u with None -> "" | Some x -> x^"@" in
let port = match p with None -> "" | Some x -> ":"^x in
let path = match s with None -> "" | Some x -> x in
Printf.sprintf "%s://%s%s%s/%s" sh user h port path
let sshversion = Prefs.createString "sshversion" ""
"*optional version suffix for ssh command [1 or 2]"
("This preference can be used to control which version "
^ "of ssh should be used to connect to the server. Legal values are "
^ "1 and 2, which will cause unison to try to use \\verb|ssh1| or"
^ "\\verb|ssh2| instead of just \\verb|ssh| to invoke ssh. "
^ "The default value is empty, which will make unison use whatever "
^ "version of ssh is installed as the default `ssh' command.")
(* Main external function *)
let parseRoot string =
let illegal2 s = raise(Prefs.IllegalValue
(Printf.sprintf
"%s: %s" string s)) in
let (protocol,user,host,port,path) = parseUri string in
let clroot =
match protocol,user,host,port with
| _,_,None,Some _
| _,Some _,None,None
| Rsh,_,None,_
| Ssh,_,None,_ ->
illegal2 "missing host"
| Rsh,_,_,Some _ ->
illegal2 "ill-formed (cannot use a port number with rsh)"
| File,_,_,Some _ ->
illegal2 "ill-formed (cannot use a port number with file)"
| File,_,Some h,None ->
let prefix = "//"^h^"/" in
(match path with
None -> ConnectLocal(Some prefix)
| Some p -> ConnectLocal(Some(prefix^p)))
| File,None,None,None ->
ConnectLocal(path)
| Socket,None,Some h,Some p ->
ConnectBySocket(h,p,path)
| Socket,Some _,_,_ ->
illegal2 "ill-formed (cannot use a user with socket)"
| Socket,_,_,None ->
illegal2 "ill-formed (must give a port number with socket)"
| Rsh,_,Some h,_ ->
ConnectByShell("rsh",h,user,port,path)
| Ssh,_,Some h,_ ->
ConnectByShell("ssh"^(Prefs.read sshversion),h,user,port,path) in
clroot