* net/tramp-adb.el (tramp-adb-maybe-open-connection): Check

properties of remote device.  Restart connection, if there is a
change.

2 files changed, 31 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 5e26ee1fca1..c256c7f8179 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2012-12-22  Michael Albinus  <michael.albinus@gmx.de>
+
+        * net/tramp-adb.el (tramp-adb-maybe-open-connection): Check
+        properties of remote device.  Restart connection, if there is a
+        change.
+
 2012-12-21  Chong Yidong  <cyd@gnu.org>
 
         * sort.el (sort-subr): Doc fix (Bug#13056).
diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index 261c65ffdae..b500b1bba61 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -982,7 +982,31 @@ connection if a previous connection has died for some reason."
             (tramp-adb-wait-for-output p)
             (unless (eq 'run (process-status p))
               (tramp-error  vec 'file-error "Terminated!"))
-            (set-process-query-on-exit-flag p nil)))))))
+            (set-process-query-on-exit-flag p nil)
+
+            ;; Check whether the properties have been changed.  If
+            ;; yes, this is a strong indication that we must expire all
+            ;; connection properties.  We start again.
+            (tramp-message vec 5 "Checking system information")
+            (tramp-adb-send-command
+             vec "echo \\\"`getprop ro.product.model` `getprop ro.product.version` `getprop ro.build.version.release`\\\"")
+            (let ((old-getprop
+                   (tramp-get-connection-property vec "getprop" nil))
+                  (new-getprop
+                   (tramp-set-connection-property
+                    vec "getprop"
+                    (with-current-buffer (tramp-get-connection-buffer vec)
+                      ;; Read the expression.
+                      (goto-char (point-min))
+                      (read (current-buffer))))))
+              (when (and (stringp old-getprop)
+                         (not (string-equal old-getprop new-getprop)))
+                (tramp-cleanup vec)
+                (tramp-message
+                 vec 3
+                 "Connection reset, because remote host changed from `%s' to `%s'"
+                 old-getprop new-getprop)
+                (tramp-adb-maybe-open-connection vec)))))))))
 
 (provide 'tramp-adb)
 ;;; tramp-adb.el ends here