Port tramp-adb to various 'touch' platforms

* lisp/net/tramp-adb.el (tramp-adb-handle-set-file-times):
Try nanoseconds first, then plain seconds, then touch -t.

1 files changed, 14 insertions, 3 deletions

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index 22f2c5f6bf1..4fba4e14f3a 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -677,11 +677,22 @@ But handle the case, if the \"test\" command is not available."
                         (tramp-compat-time-equal-p time tramp-time-doesnt-exist)
                         (tramp-compat-time-equal-p time tramp-time-dont-know))
                     (current-time)
-                  time)))
+                  time))
+          (quoted-name (tramp-shell-quote-argument localname)))
+      ;; Older versions of toybox 'touch' mishandle nanoseconds and/or
+      ;; trailing "Z", so fall back on plain seconds if nanoseconds+Z
+      ;; fails.  Also, fall back on old POSIX 'touch -t' if 'touch -d'
+      ;; (introduced in POSIX.1-2008) fails.
       (tramp-adb-send-command-and-check
-       v (format "touch -d %s %s"
+       v (format (concat "touch -d %s %s 2>/dev/null || "
+                         "touch -d %s %s 2>/dev/null || "
+                         "touch -t %s %s")
+                 (format-time-string "%Y-%m-%dT%H:%M:%S.%NZ" time t)
+                 quoted-name
                  (format-time-string "%Y-%m-%dT%H:%M:%S" time t)
-                 (tramp-shell-quote-argument localname))))))
+                 quoted-name
+                 (format-time-string "%Y%m%d%H%M.%S" time t)
+                 quoted-name)))))
 
 (defun tramp-adb-handle-copy-file
   (filename newname &optional ok-if-already-exists keep-date