I've made a start on a mkfs tool for PDP-7 Unix. So far I have the routines

to build the filesystem, but they are not tested. I need to add code to
parse the "proto" file, whose syntax is based on the 6th Edition proto file.
I also need to dump out the filesystem image.

tools/proto

@@ -0,0 +1,39 @@
+# Prototype file for PDP-7 Unix filesystem layout
+#
+# Entries are one of:
+#    filename f[r-][w-][r-][r-] uid local_file_to_insert
+#    dirname  d[r-][w-][r-][r-] uid [inumber]
+#    device   i[r-][w-][r-][r-] uid inumber
+#
+# The top directory's name is ignored
+# Numeric values are in decimal
+# Contents of each directory ends with a $ on a line by itself
+# Format was inspired by 6th Edition mkfs
+#
+dd 	     drw-- -1 2
+    system   drw-- -1 3
+	init frwr- -1 ../bin/init
+	$
+    ttyin    irwr- -1 6
+    keyboard irwr- -1 7
+    pptin    irwr- -1 8
+    ttyout   irwr- -1 10
+    display  irwr- -1 11
+    pptout   irwr- -1 12
+    as       frwr- -1 ../bin/as
+    cat      frwr- -1 ../bin/cat
+    chmod    frwr- -1 ../bin/chmod
+    chown    frwr- -1 ../bin/chown
+    chrm     frwr- -1 ../bin/chrm
+    cp       frwr- -1 ../bin/cp
+    date     frwr- -1 ../bin/date
+    ds       frwr- -1 ../bin/ds
+    ln       frwr- -1 ../bin/ln
+    ls       frwr- -1 ../bin/ls
+    mv       frwr- -1 ../bin/mv
+    sh       frwr- -1 ../bin/sh
+    stat     frwr- -1 ../bin/stat
+    ken      drwr- 10
+        $
+    dmr      drwr- 12
+        $