From ae0a0fd04881faf263a8e0e58067001323630020 Mon Sep 17 00:00:00 2001
From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Fri, 23 Apr 2021 12:13:15 +1000
Subject: [PATCH] added

---
 un-merge-usr.lsp | 80 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 un-merge-usr.lsp

diff --git a/un-merge-usr.lsp b/un-merge-usr.lsp
new file mode 100644
index 0000000..4cb58f0
--- /dev/null
+++ b/un-merge-usr.lsp
@@ -0,0 +1,80 @@
+#!/usr/bin/newlisp
+#
+# This script undo the "merged usr" directories; i.e., replace any
+# toplevel links /bin, /sbin, /lib, /lib32, /libx32, or /lib64 with
+# proper directories of their content according to installation paths.
+#
+# 
+
+(signal 2 (fn (x) (exit 1)))
+
+(define (replace-file A B)
+  (delete-file A)
+  (rename-file B A))
+
+(define (installs-as PATH)
+  (= (! (format "/usr/bin/dpkg -S \"%s\" > /dev/null 2>&1" PATH))))
+
+(define (delete-file-exist PATH)
+  (and (file? PATH) (delete-file PATH)))
+
+(setf UNSURE "/var/log/UNSURE" TELL true)
+(define (unsure PATH)
+  (when TELL
+    (println (format "Adding paths to %s with unsure pathnames" UNSURE))
+    (setf TELL nil)
+    )
+  (append-file UNSURE (string PATH "\n")))
+
+(define (delete-empty-dirs D)
+  (! (format "/usr/bin/find %s /usr%s -depth -type d -delete 2>/dev/null" D D))
+  )
+
+#### Un-merging process starts here
+(setf DIRS '("/bin" "/sbin" "/lib" "/lib32" "/libx32" "/lib64")
+      CP (if (file? "/bin/cp") "/bin/cp" "/usr/bin/cp") )
+
+(println (date))
+
+# Make target directories as copies of their /usr linking
+(dolist (D DIRS)
+  (when (and (= 41471 (file-info D 1)) (directory? D))
+    (println "copying " D)
+    (let ((Dx (format "%s-tobe" D)))
+      (and (make-dir Dx)
+           (= (! (format "%s -a /usr%s/. %s/." CP D Dx)))
+           (replace-file D Dx)))))
+
+# Rebuild library cache
+(= (! "/sbin/ldconfig"))
+
+# Remove counterpart of known installed file(s), then remove any empty
+# directories
+(dolist (D DIRS)
+  (when (directory? (string "/usr" D))
+    (let ((N 0) (FILES (exec (format "/usr/bin/find /usr%s -type f" D))))
+      (println "checking " (length FILES) " files for " D)
+      (dolist (F FILES)
+        (when (= (% (inc N) 100))
+          (print (format "checked %d of %d files for %s\r"
+                         N (length FILES) D))
+          (setf TELL true))
+        (if (installs-as F) (delete-file-exist (4 F))
+          (installs-as (4 F)) (delete-file F)
+          (unsure F)))
+      (delete-empty-dirs D)
+      )
+    (println)
+    ))
+
+# Rebuild library cache
+(= (! "/sbin/ldconfig"))
+
+# Ensure the root directories still/again exist 
+(dolist (D DIRS)
+  (! (format "/bin/touch %s /usr%s" D D)))
+
+(print "Push enter to reboot: ")
+(read-line)
+(! "/usr/sbin/reboot")
+(exit 0)
-- 
2.39.2