Add coreutils 'ls' support for tramp adb

* lisp/net/tramp-adb.el (tramp-adb-ls-toolbox-regexp): Allow '.'
character in file permissions. It indicates an SELinux security
context.
(tramp-adb-get-ls-command): Detect Coreutils version of 'ls'.
Use 'ls -1' instead of passing COLUMNS=1 env variable. This is
isofunctional.  (Bug#30594)

Copyright-paperwork-exempt: yes

1 files changed, 9 insertions, 3 deletions

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index f5c45f68e94..cb805067864 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -71,7 +71,7 @@ It is used for TCP/IP devices."
 
 (defconst tramp-adb-ls-toolbox-regexp
   (concat
-   "^[[:space:]]*\\([-[:alpha:]]+\\)"   ; \1 permissions
+   "^[[:space:]]*\\([-.[:alpha:]]+\\)"  ; \1 permissions
    "\\(?:[[:space:]]+[[:digit:]]+\\)?"  ; links (Android 7/toybox)
    "[[:space:]]*\\([^[:space:]]+\\)"    ; \2 username
    "[[:space:]]+\\([^[:space:]]+\\)"    ; \3 group
@@ -462,9 +462,15 @@ pass to the OPERATION."
   (with-tramp-connection-property vec "ls"
     (tramp-message vec 5 "Finding a suitable `ls' command")
     (cond
+     ;; Support Android derived systems where "ls" command is provided
+     ;; by GNU Coreutils. Force "ls" to print one column and set
+     ;; time-style to imitate other "ls" flavours.
+     ((tramp-adb-send-command-and-check
+       vec "ls --time-style=long-iso /dev/null")
+      "ls -1 --time-style=long-iso")
      ;; Can't disable coloring explicitly for toybox ls command.  We
-     ;; must force "ls" to print just one column.
-     ((tramp-adb-send-command-and-check vec "toybox") "env COLUMNS=1 ls")
+     ;; also must force "ls" to print just one column.
+     ((tramp-adb-send-command-and-check vec "toybox") "ls -1")
      ;; On CyanogenMod based system BusyBox is used and "ls" output
      ;; coloring is enabled by default.  So we try to disable it when
      ;; possible.