FreeBSD >> operator does not append

[benrubson]

Hello,

I just discovered this :

$ uname -sr
FreeBSD 11.0-RELEASE-p8
$ /tmp/encfs --version
encfs version 1.9.1
$
$ echo -e "line1\nline2\nline3" > test.txt
$ cat test.txt 
line1
line2
line3
$ echo line4 >> test.txt 
$ cat test.txt 
line4
line2
line3
$

EncFS does not correctly append content to the end of the file, as if it was not able to seek.

Ben

[Aikhjarto]

Cannot confirm on Leap 42.2 with kernel 4.11.6 and encfs 1.9.1.
On my system appending works.

[benrubson]

Thank you for your test @Aikhjarto.
What is strange is that the internalModification test correctly works.
https://github.com/vgough/encfs/blob/v1.9.1/tests/normal.t.pl#L86
So sounds like seek() performs correctly.
Not sure exactly what >> internally does.

[benrubson]

One more test :

# cat test.pl 
unlink "perltest.txt";
open(my $out, ">", "perltest.txt");
print($out "line1\nline2\nline3\n");
close($out);
open($out, ">>", "perltest.txt");
print($out "line4\n");
close($out);
# 
# perl test.pl 
# cat perltest.txt 
line1
line2
line3
line4
#

So appending using Perl seems to work...
Really strange !

[benrubson]

OK, same issue using another Fuse FS, such as sshfs.

I've then opened a FreeBSD bug :
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220185

[rfjakob]

Sounds like freebsd has a problem with files opened with the O_APPEND flags

…

On Jun 21, 2017 3:53 PM, "Ben RUBSON" ***@***.***> wrote: OK, same issue using another Fuse FS, such as sshfs. I've then opened a FreeBSD bug : https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220185 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#334 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARgf1qCVPJEstAB8N5PwMN-fX2-sx11ks5sGSB0gaJpZM4OAi-V> .

[benrubson]

Good news, @cemeyer found the bug and proposed a FreeBSD patch 👍
I then close this issue.
Many thx !

[cemeyer]

Perl must not use O_APPEND internally. Happy to help.

[benrubson]

Good news, patch will be available in upcoming FreeBSD 11.1 :
https://svnweb.freebsd.org/changeset/base/320689