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Re: fractional file timestamps in tramp-adb
From: |
Michael Albinus |
Subject: |
Re: fractional file timestamps in tramp-adb |
Date: |
Fri, 15 Feb 2019 09:11:32 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Paul Eggert <address@hidden> writes:
Hi Paul,
> Interesting. Does it work without the ".318491822" but keep the "Z"?
Yes.
--8<---------------cut here---------------start------------->8---
$ touch -d 2019-02-14T18:23:17.318491822 /sdcard/tmp/foo
touch: '/sdcard/tmp/foo': Operation not permitted
--8<---------------cut here---------------end--------------->8---
> How about if you replace ".31849182" with ".000000000" while keeping
> the "Z"?
Doesn't work.
--8<---------------cut here---------------start------------->8---
$ touch -d 2019-02-14T18:23:17.000000000Z /sdcard/tmp/foo
touch: bad '2019-02-14T18:23:17.000000000': Value too large for defined data
type
--8<---------------cut here---------------end--------------->8---
> Can you strace the 'touch' and see what system calls are failing and
> what their arguments are?
There's no strace on my Galaxy.
In older Android versions, most of the coreutils were implemented via
busybox. This has been replaced by toybox:
--8<---------------cut here---------------start------------->8---
$ which touch
/system/bin/touch
$ ls -l /system/bin/touch
lrwxrwxrwx 1 root root 6 2016-03-25 17:04 /system/bin/touch -> toybox
$ toybox --version
0.7.0--android
--8<---------------cut here---------------end--------------->8---
See also <https://lwn.net/Articles/629362/>. tramp-adb.el has already
some few checks for toybox, but not systematically. I suspect we need to
do it better, due to the differences in command parameters, and their
output.
I'm afraid, I'm not an experienced Android developer (tramp-adb.el was
written by somebody else). Any help appreciated!
Best regards, Michael.