Re: [gentoo-user] detox'ing files by keeping their time stamp?

[Floyd Anderson]

Hi David,

On Sun, 18 Feb 2018 17:34:21 +0100
David Haller <gentoo@×××××××.de> wrote:
>Hello,
>
>On Sun, 18 Feb 2018, Floyd Anderson wrote:
>>On Sun, 18 Feb 2018 14:44:24 +0100
>>tuxic@××××××.de wrote:
>>> On 02/18 01:55, Floyd Anderson wrote:
>>> > On Sun, 18 Feb 2018 13:07:33 +0100
>>> > tuxic@××××××.de wrote:
>>> > > On 02/18 11:38, Stroller wrote:
>[..]
>>> > > > I think:
>>> > > >
>>> > > >   tmpfile=/tmp/foo-$RANDOM
>>> > > >   touch -r "$file" "$tmpfile"
>>> > > >   detox "$file"
>>> > > >   touch -r "$tmpfile "$file"
>>> > > >   rm "$tmpfile"
>[..]
>>> > > I like to wrap detox with a script, which will do you magic trick.
>>> > > Since I want to get rid of those evil characters (...) in the filename,
>>> > > which normally intercept shell processing, I want to use detox,
>>> > > which in turn will be called by a shell script in turn, to do the
>>> > > time machine magic. To do so, I need detox, to sanitize the
>>> > > filenames from the evil characters, which normally intercept.....
>>> > > .....stack overflow....recursion depth failure.....process killed.
>[..]
>>So you have to figure out why detox, that I doesn't know and thus never have
>>been used, does not rename those files. Maybe because the new file (after
>>file name translation) already exists in directory as mentioned in the BUGS
>>section of the manual page. So you must ensure that all resulting file names
>>are unique.
>[..]
>>> And the circle starts right from the beginning.
>>> The problem arises at that moment, where I need to feed the name
>>> of a single file what program ever, since first there is the shell...
>>> even when calling other programs.
>>
>>Here comes escaping and/or quoting into play but the glob `detox *`, you've
>>specified, should work. Can you share a sample file name with funny
>>characters in it?
>
>Well, at least bash is robust enough if you quote variables correctly.
>
>$ ls -lb
>total 4
>-rw-r--r-- 1 dh dh   0 Feb 18 17:23 a\ "\ b\ '\ c\ #\ d
>-rw-r--r-- 1 dh dh   0 Feb 18 17:27 a"b\ c
>-rw-r--r-- 1 dh dh   0 Feb 18 17:26 a'b
>-rw-r----- 1 dh dh 166 Feb 18 17:26 t.sh
>
>$ cat t.sh
>#!/bin/bash
>TMPF=$(mktemp "/tmp/detox_wrapper.$$.XXXXXXXX")
>for f in "$@"; do
>    touch -r "$f" "$TMPF"
>    detox "$f"
>    touch -r "$TMPF" "$f"
>done
>rm -f "$TMPF"

If I’m not totally wrong, the second `touch` cannot work because the 
file that "$f" holds is renamed now. That’s what I mean earlier with 
iterating a list or adapt Stroller’s suggestion.

I have no idea if:

    modtime="$(stat -c '%Y' "$f")"
    newfile="$(detox $"f")"
    touch -d "@$modtime" "$newfile"

is possible instead.


-- 
Regards,
floyd