X-Git-Url: https://git.hcoop.net/hcoop/domtool2.git/blobdiff_plain/7a9616824f3478c4ba5eec100692e277e23243ab..dee1a22babf7a1eb1c938f716dc37ced3abfd4e4:/src/mail/vmail.sml

diff --git a/src/mail/vmail.sml b/src/mail/vmail.sml
index 60a3a35..cf36f9f 100644
--- a/src/mail/vmail.sml
+++ b/src/mail/vmail.sml
@@ -28,33 +28,41 @@ datatype listing =
 
 fun list domain =
     let
-	val inf = TextIO.openIn (OS.Path.joinDirFile {dir = Config.Courier.userdbDir,
-						      file = domain})
-
-	fun loop users =
-	    case TextIO.inputLine inf of
-		NONE => Listing (rev users)
-	      | SOME line =>
-		case String.tokens Char.isSpace line of
-		    [addr, fields] =>
-		    (case String.fields (fn ch => ch = #"@") addr of
-			 [user, _] =>
-			 let
-			     fun parseFields fields =
-				 case fields of
-				     "mail" :: mailbox :: _ => loop ({user = user, mailbox = mailbox} :: users)
-				   | _ :: _ :: rest => parseFields rest
-				   | _ => Error "Invalid fields in database"
-			 in
-			     parseFields (String.fields (fn ch => ch = #"|" orelse ch = #"=") fields)
-			 end
-		       | _ => Error "Invalid e-mail address format in database")
-		  | _ => Error "Invalid entry in database"
+	val file = OS.Path.joinDirFile {dir = Config.Courier.userdbDir,
+						      file = domain}
     in
-	loop []
-	before TextIO.closeIn inf
+	if Posix.FileSys.access (file, []) then
+	    let
+		val inf = TextIO.openIn file
+
+		fun loop users =
+		    case TextIO.inputLine inf of
+			NONE => Listing (rev users)
+		      | SOME line =>
+			case String.tokens Char.isSpace line of
+			    [addr, fields] =>
+			    (case String.fields (fn ch => ch = #"@") addr of
+				 [user, _] =>
+				 let
+				     fun parseFields fields =
+					 case fields of
+					     "mail" :: mailbox :: _ => loop ({user = user, mailbox = mailbox} :: users)
+					   | _ :: _ :: rest => parseFields rest
+					   | _ => Error "Invalid fields in database"
+				 in
+				     parseFields (String.fields (fn ch => ch = #"|" orelse ch = #"=") fields)
+				 end
+			       | _ => Error "Invalid e-mail address format in database")
+			  | _ => Error "Invalid entry in database"
+	    in
+		loop []
+		before TextIO.closeIn inf
+	    end
+	else
+	    Listing []
     end
-	handle IO.Io _ => Listing []
+    handle IO.Io {name, function, ...} =>
+	   Error ("IO failure: " ^ name ^ ": " ^ function)
 
 fun mailboxExists {domain, user} =
     let