<link>http://people.skolelinux.org/pere/blog/</link>
<atom:link href="http://people.skolelinux.org/pere/blog/index.rss" rel="self" type="application/rss+xml" />
+ <item>
+ <title>Broken umask handling with sshfs</title>
+ <link>http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html</link>
+ <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Broken_umask_handling_with_sshfs.html</guid>
+ <pubDate>Thu, 26 Aug 2010 13:30:00 +0200</pubDate>
+ <description>
+<p>My file system sematics program
+<a href="http://people.skolelinux.org/pere/blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html">presented
+a few days ago</a> is very useful to verify that a file system can
+work as a unix home directory,and today I had to extend it a bit. I'm
+looking into alternatives for home directory access here at the
+University of Oslo, and one of the options is sshfs. My friend
+Finn-Arne mentioned a while back that they had used sshfs with Debian
+Edu, but stopped because of problems. I asked today what the problems
+where, and he mentioned that sshfs failed to handle umask properly.
+Trying to detect the problem I wrote this addition to my fs testing
+script:</p>
+
+<pre>
+mode_t touch_get_mode(const char *name, mode_t mode) {
+ mode_t retval = 0;
+ int fd = open(name, O_RDWR|O_CREAT|O_LARGEFILE, mode);
+ if (-1 != fd) {
+ unlink(name);
+ struct stat statbuf;
+ if (-1 != fstat(fd, &statbuf)) {
+ retval = statbuf.st_mode & 0x1ff;
+ }
+ close(fd);
+ }
+ return retval;
+}
+
+/* Try to detect problem discovered using sshfs */
+int test_umask(void) {
+ printf("info: testing umask effect on file creation\n");
+
+ mode_t orig_umask = umask(000);
+ mode_t newmode;
+ if (0666 != (newmode = touch_get_mode("foobar", 0666))) {
+ printf(" error: Wrong file mode %o when creating using mode 666 and umask 000\n",
+ newmode);
+ }
+ umask(007);
+ if (0660 != (newmode = touch_get_mode("foobar", 0666))) {
+ printf(" error: Wrong file mode %o when creating using mode 666 and umask 007\n",
+ newmode);
+ }
+
+ umask (orig_umask);
+ return 0;
+}
+
+int main(int argc, char **argv) {
+ [...]
+ test_umask();
+ return 0;
+}
+</pre>
+
+<p>Sure enough. On NFS to a netapp, I get this result:</p>
+
+<pre>
+Testing POSIX/Unix sematics on file system
+info: testing symlink creation
+info: testing subdirectory creation
+info: testing fcntl locking
+ Read-locking 1 byte from 1073741824
+ Read-locking 510 byte from 1073741826
+ Unlocking 1 byte from 1073741824
+ Write-locking 1 byte from 1073741824
+ Write-locking 510 byte from 1073741826
+ Unlocking 2 byte from 1073741824
+info: testing umask effect on file creation
+</pre>
+
+<p>When mounting the same directory using sshfs, I get this
+result:</p>
+
+<pre>
+Testing POSIX/Unix sematics on file system
+info: testing symlink creation
+info: testing subdirectory creation
+info: testing fcntl locking
+ Read-locking 1 byte from 1073741824
+ Read-locking 510 byte from 1073741826
+ Unlocking 1 byte from 1073741824
+ Write-locking 1 byte from 1073741824
+ Write-locking 510 byte from 1073741826
+ Unlocking 2 byte from 1073741824
+info: testing umask effect on file creation
+ error: Wrong file mode 644 when creating using mode 666 and umask 000
+ error: Wrong file mode 640 when creating using mode 666 and umask 007
+</pre>
+
+<p>So, I can conclude that sshfs is better than smb to a Netapp or a
+Windows server, but not good enough to be used as a home
+directory.</p>
+</description>
+ </item>
+
<item>
<title>Elektronisk stemmegiving er ikke til å stole på - heller ikke i Norge</title>
<link>http://people.skolelinux.org/pere/blog/Elektronisk_stemmegiving_er_ikke_til____stole_p_____heller_ikke_i_Norge.html</link>
</description>
</item>
- <item>
- <title>First Debian Edu test release (alpha0) based on Squeeze is released</title>
- <link>http://people.skolelinux.org/pere/blog/First_Debian_Edu_test_release__alpha0__based_on_Squeeze_is_released.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/First_Debian_Edu_test_release__alpha0__based_on_Squeeze_is_released.html</guid>
- <pubDate>Tue, 27 Jul 2010 17:45:00 +0200</pubDate>
- <description>
-<p>I just posted this announcement culminating several months of work
-with the next Debian Edu release. Not nearly done, but one major step
-completed.</p>
-
-<blockquote>
-<p>This is the first test release based on Squeeze. The focus of this
-release is to test the user application selection. To have a look,
-install the standalone profile and let the developers know if the set
-of installed packages i.e. applications should be modified. If some
-user application is missing, or if there are some applications that no
-longer make sense to be included in Debian Edu, please let us know.
-Also, if a useful application is missing the translation for your
-language of choice, please let us know too.</p>
-
-<p>In addition, feedback and help to polish the desktop (menus,
-artwork, starters, etc.) is appreciated. We would like to ship a nice
-and handy KDE4 desktop targeted for schools out of the box.</p>
-
-<p>The other profiles should be installable, but there is a lot more
-work left to be done before they are ready, so do not expect to
-much.</p>
-
-<p>Changes compared to the lenny based version</p>
-
-<ul>
-<li>Everything from Debian Squeeze
-<ul>
- <li>Desktop environment KDE 4.4 => the new KDE desktop in
- combination with some new artwork
- <li>Web browser Iceweasel 3.5
- <li>OpenOffice.org 3.2
- <li>Educational toolbox GCompris 9.3
- <li>Music creator Rosegarden 10.04.2
- <li>Image editor Gimp 2.6.10
- <li>Virtual universe Celestia 1.6.0
- <li>Virtual stargazer Stellarium 0.10.4
- <li>3D modeler Blender 2.49.2 (new application)
- <li>Video editor Kdenlive 0.7.7 (new application)
-</ul></li>
-<li>Now using Kerberos for password checking (migration not finished).
- Enabled for:
-<ul>
- <li>PAM
- <li>LDAP
- <li>IMAP
- <li>SMTP (sender verification)
-</ul>
-</li>
-<li>New experimental roaming workstation profile for laptops.</li>
-<li>Show welcome page to users when they first log in. The URL is
- fetched from LDAP.</li>
-<li>New LXDE desktop option, in addition to KDE (default) and Gnome.</li>
-<li>General cleanup (not finished)</li>
-</ul>
-<p>The following features are not working as they should</p>
-
-<ul>
-<li>No web based administration tool for creating users and groups. The
- scripts ldap-createuser-krb and ldap-add-user-to-group can be used
- for testing.</li>
-<li>DVD installs are missing debian-installer images for the PXE boot,
- and do not set up the PXE menu on eth0 because of this. LTSP
- clients should still boot from eth1 on thin client servers.</li>
-<li>The restructured KDE menu is not implemented.</li>
-<li>The LDAP server setup need to be reviewed for security.</li>
-<li>The LDAP directory structure need to be reworked.</li>
-<li>Different sets of packages are installed when using the DVD and the
- netinst CD. More packages are installed using the netinst CD.</li>
-<li>The jackd package fail to install. This is believed to be caused by
- some ongoing transition, and hopefully should be solved soon. The
- jackd1 package can be installed manually for those that need it.</li>
-<li>Some packages lack translations. See
- http://wiki.debian.org/DebianEdu/Status/Squeeze for updated status,
- and help out with translations.</li>
-</ul>
-
-<p>To download this multiarch netinstall release you can use</p>
-
-<ul>
-<li><a href="ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso">ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso</a></li>
-<li><a href="http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso">http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso</a></li>
-<li>rsync -avzP ftp.skolelinux.org::skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-CD.iso</li>
-</ul>
-<p>To download this multiarch dvd release you can use</p>
-
-<ul>
-<li><a href="ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso">ftp://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso</a></li>
-<li><a href="http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso">http://ftp.skolelinux.org/skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso</a></li>
-<li>rsync -avzP ftp.skolelinux.org::skolelinux-cd/squeeze-alpha/debian-edu-6.0.0+edua0-DVD.iso</li>
-</ul>
-
-<p>There is no source DVD available yet. It will be prepared when we
-get closer to the final release.</p>
-
-<p>The MD5SUM of these images are</p>
-
-<ul>
-<li>3dbf45d59f42a53518b6e3c9ec3b5eb6 debian-edu-6.0.0+edua0-CD.iso</li>
-<li>22f2cbfce281d1c6e478be452638675d debian-edu-6.0.0+edua0-DVD.iso</li>
-</ul>
-
-<p>The SHA1SUM of these images are</p>
-<ul>
-<li>c53d1b69b40cf37cd27aefaf33f6f6a3821bedf0 debian-edu-6.0.0+edua0-CD.iso</li>
-<li>2ec29d7db676d59d32197b05c277ffe16348376c debian-edu-6.0.0+edua0-DVD.iso</li>
-</ul>
-<p>How to report bugs:
-http://wiki.debian.org/DebianEdu/HowTo/ReportBugsInBugzilla</p>
-
-<p>Please direct replies to debian-edu@lists.debian.org</p>
-</blockquote>
-</description>
- </item>
-
</channel>
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