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diff --git a/tools/cvs2fossil/lib/c2f_wsstate.tcl b/tools/cvs2fossil/lib/c2f_wsstate.tcl
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+## -*- tcl -*-
+# # ## ### ##### ######## ############# #####################
+## Copyright (c) 2008 Andreas Kupries.
+#
+# This software is licensed as described in the file LICENSE, which
+# you should have received as part of this distribution.
+#
+# This software consists of voluntary contributions made by many
+# individuals.  For exact contribution history, see the revision
+# history and logs, available at http://fossil-scm.hwaci.com/fossil
+# # ## ### ##### ######## ############# #####################
+
+## Track the state of a cvs workspace as changesets are committed to
+## it. Nothing actually happens in the filesystem, this is completely
+## virtual.
+
+# # ## ### ##### ######## ############# #####################
+## Requirements
+
+package require Tcl 8.4                             ; # Required runtime.
+package require snit                                ; # OO system.
+package require struct::list                        ; # List assignment
+package require vc::tools::log                      ; # User feedback.
+
+# # ## ### ##### ######## ############# #####################
+##
+
+snit::type ::vc::fossil::import::cvs::wsstate {
+    # # ## ### ##### ######## #############
+    ## Public API
+
+    constructor {lod} {
+	# Start with an empty state
+	set myname   $lod
+	set myticks  0
+	set myparent {}
+	return
+    }
+
+    method name   {} { return $myname }
+    method ticks  {} { return $myticks }
+
+    method add {oprevisioninfo} {
+	# oprevisioninfo = list (rid path label op ...) /quadruples
+
+	# Overwrite all changed files (identified by path) with the
+	# new revisions. This keeps all unchanged files. Files marked
+	# as dead are removed.
+
+	foreach {rid path label rop} $oprevisioninfo {
+	    log write 5 wss {$myop($rop) $label}
+
+	    if {$rop < 0} {
+		if {[catch {
+		    unset mystate($path)
+		}]} {
+		    log write 0 wss "Removed path \"$path\" is not known to the workspace"
+		}
+	    } else {
+		set mystate($path) [list $rid $label]
+	    }
+	}
+
+	incr myticks
+	return
+    }
+
+    method get {} {
+	set res {}
+	foreach path [lsort -dict [array names mystate]] {
+	    struct::list assign $mystate($path) rid label
+	    lappend res $rid $path $label
+	}
+	return $res
+    }
+
+    method defid {id} {
+	set myid $id
+	return
+    }
+
+    method getid {} { return $myid }
+
+    method defstate {s} { array set mystate $s ; return }
+    method getstate {}  { return [array get mystate] }
+
+    method parent {} { return $myparent }
+    method defparent {parent} {
+	set myparent $parent
+	return
+    }
+
+    # # ## ### ##### ######## #############
+    ## State
+
+    variable myname {}         ; # Name of the LOD the workspace is
+				 # for.
+    variable myid   {}         ; # Record id of the fossil manifest
+				 # associated with the current state.
+    variable mystate -array {} ; # Map from paths to the recordid of
+				 # the file revision behind it, and
+				 # the associated label for logging.
+    variable myticks 0         ; # Number of 'add' operations
+				 # performed on the state.
+    variable myparent {}       ; # Reference to the parent workspace.
+
+    typevariable myop -array {
+	-1 REM
+	0  ---
+	1  ADD
+	2  CHG
+    }
+
+    # # ## ### ##### ######## #############
+    ## Configuration
+
+    pragma -hastypeinfo    no  ; # no type introspection
+    pragma -hasinfo        no  ; # no object introspection
+    pragma -hastypemethods no  ; # type is not relevant.
+
+    # # ## ### ##### ######## #############
+}
+
+namespace eval ::vc::fossil::import::cvs {
+    namespace export wsstate
+    namespace eval wsstate {
+	namespace import ::vc::tools::log
+	log register wss
+    }
+}
+
+# # ## ### ##### ######## ############# #####################
+## Ready
+
+package provide vc::fossil::import::cvs::wsstate 1.0
+return