* Accessing long filesystem paths using Python
[not found] <AM6PR08MB4421EE65314E815E8BA73753E63B9@AM6PR08MB4421.eurprd08.prod.outlook.com>
@ 2022-11-04 12:15 ` Fritjof Bornebusch
2022-11-04 12:56 ` marco atzeri
0 siblings, 1 reply; 4+ messages in thread
From: Fritjof Bornebusch @ 2022-11-04 12:15 UTC (permalink / raw)
To: cygwin
[-- Attachment #1: Type: text/plain, Size: 407 bytes --]
Hi,
I need to write files whose path exceed the maximum value of 260 characters.
Using Windows paths, you can add \\?\ as prefix, e.g., \\?\C:\Users\foo\bar\<file://%3f/C:/Users/foo/bar/>....
However, it seems like this is not the case in Cygwin. When I use \\?\/home/foo/bar<file://%3f/home/foo/bar>, I get no file pointer back.
Does someone have a clue how I can bypass this?
Best,
Fritjof
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Accessing long filesystem paths using Python
2022-11-04 12:15 ` Accessing long filesystem paths using Python Fritjof Bornebusch
@ 2022-11-04 12:56 ` marco atzeri
2022-11-04 13:30 ` Fritjof Bornebusch
0 siblings, 1 reply; 4+ messages in thread
From: marco atzeri @ 2022-11-04 12:56 UTC (permalink / raw)
To: Fritjof Bornebusch; +Cc: cygwin
On Fri, Nov 4, 2022 at 1:16 PM Fritjof Bornebusch
<fritjof.bornebusch@prover.com> wrote:
>
> Hi,
>
> I need to write files whose path exceed the maximum value of 260 characters.
> Using Windows paths, you can add \\?\ as prefix, e.g., \\?\C:\Users\foo\bar\<file://%3f/C:/Users/foo/bar/>....
>
> However, it seems like this is not the case in Cygwin. When I use \\?\/home/foo/bar<file://%3f/home/foo/bar>, I get no file pointer back.
>
> Does someone have a clue how I can bypass this?
>
> Best,
> Fritjof
>
Have you tried POSIX style ?
/cygdrive/C/Users/foo/bar..
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: Accessing long filesystem paths using Python
2022-11-04 12:56 ` marco atzeri
@ 2022-11-04 13:30 ` Fritjof Bornebusch
2022-11-07 9:33 ` Corinna Vinschen
0 siblings, 1 reply; 4+ messages in thread
From: Fritjof Bornebusch @ 2022-11-04 13:30 UTC (permalink / raw)
To: marco atzeri; +Cc: cygwin
Jep,
No success.
-----Original Message-----
From: marco atzeri <marco.atzeri@gmail.com>
Sent: Friday, 4 November 2022 13:57
To: Fritjof Bornebusch <fritjof.bornebusch@prover.com>
Cc: cygwin@cygwin.com
Subject: Re: Accessing long filesystem paths using Python
On Fri, Nov 4, 2022 at 1:16 PM Fritjof Bornebusch <fritjof.bornebusch@prover.com> wrote:
>
> Hi,
>
> I need to write files whose path exceed the maximum value of 260 characters.
> Using Windows paths, you can add \\?\ as prefix, e.g., \\?\C:\Users\foo\bar\<file://%3f/C:/Users/foo/bar/>....
>
> However, it seems like this is not the case in Cygwin. When I use \\?\/home/foo/bar<file://%3f/home/foo/bar>, I get no file pointer back.
>
> Does someone have a clue how I can bypass this?
>
> Best,
> Fritjof
>
Have you tried POSIX style ?
/cygdrive/C/Users/foo/bar..
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Accessing long filesystem paths using Python
2022-11-04 13:30 ` Fritjof Bornebusch
@ 2022-11-07 9:33 ` Corinna Vinschen
0 siblings, 0 replies; 4+ messages in thread
From: Corinna Vinschen @ 2022-11-07 9:33 UTC (permalink / raw)
To: cygwin
Hi Fridjof,
Please don't top-post.
On Nov 4 13:30, Fritjof Bornebusch wrote:
> On Nov 4 13:57, marco atzeri wrote:
>> On Fri, Nov 4, 2022 at 1:16 PM Fritjof Bornebusch wrote:
>> >
>> > Hi,
>> >
>> > I need to write files whose path exceed the maximum value of 260 characters.
>> > Using Windows paths, you can add \\?\ as prefix, e.g., \\?\C:\Users\foo\bar\<file://%3f/C:/Users/foo/bar/>....
>> >
>> > However, it seems like this is not the case in Cygwin. When I use \\?\/home/foo/bar<file://%3f/home/foo/bar>, I get no file pointer back.
>> >
>> > Does someone have a clue how I can bypass this?
>> >
>> > Best,
>> > Fritjof
>> >
>>
>> Have you tried POSIX style ?
>> /cygdrive/C/Users/foo/bar..
>
> Jep,
>
> No success.
Works for me:
======================================================================
$ cat > longp.sh <<EOF
#!/bin/bash
POSIX_MAX=4096
# 240 chars per path component
DIRNAM="123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890"
LPATH=/tmp
cd /tmp
while [ $(echo -n "$LPATH" | wc -c) -lt $POSIX_MAX ]
do
mkdir "$DIRNAM" || exit 1
LPATH="$LPATH/$DIRNAM"
ls -d "$LPATH" || exit 2
cd "$LPATH" || exit 3
echo "Current length: $(echo -n $LPATH | wc -c)"
sleep 1
done
EOF
$ chmod +x longp.sh
$ ./longp.sh
/tmp/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
Current length: 245
[...]
12345678901234567890/123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
Current length: 4101
$
======================================================================
If you have specific trouble, please provide a specific, simple testcase,
preferredly in plain C or as shell script.
Thanks,
Corinna
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-11-04 12:15 ` Accessing long filesystem paths using Python Fritjof Bornebusch
2022-11-04 12:56 ` marco atzeri
2022-11-04 13:30 ` Fritjof Bornebusch
2022-11-07 9:33 ` Corinna Vinschen
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