blog/Broken_umask_handling_with_sshfs.html

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   6     <title>Petter Reinholdtsen: Broken umask handling with sshfs</title>
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  14  <h1>
  15      <a href="http://www.hungry.com/~pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Broken umask handling with sshfs</div>
  24       <div class="date">26th August 2010</div>
  25       <div class="body"><p>My file system sematics program
  26 <a href="http://www.hungry.com/~pere/blog/Testing_if_a_file_system_can_be_used_for_home_directories___.html">presented
  27 a few days ago</a> is very useful to verify that a file system can
  28 work as a unix home directory,and today I had to extend it a bit.  I'm
  29 looking into alternatives for home directory access here at the
  30 University of Oslo, and one of the options is sshfs.  My friend
  31 Finn-Arne mentioned a while back that they had used sshfs with Debian
  32 Edu, but stopped because of problems.  I asked today what the problems
  33 where, and he mentioned that sshfs failed to handle umask properly.
  34 Trying to detect the problem I wrote this addition to my fs testing
  35 script:</p>
  36
  37 <pre>
  38 mode_t touch_get_mode(const char *name, mode_t mode) {
  39   mode_t retval = 0;
  40   int fd = open(name, O_RDWR|O_CREAT|O_LARGEFILE, mode);
  41   if (-1 != fd) {
  42     unlink(name);
  43     struct stat statbuf;
  44     if (-1 != fstat(fd, &statbuf)) {
  45       retval = statbuf.st_mode & 0x1ff;
  46     }
  47     close(fd);
  48   }
  49   return retval;
  50 }
  51
  52 /* Try to detect problem discovered using sshfs */
  53 int test_umask(void) {
  54   printf("info: testing umask effect on file creation\n");
  55
  56   mode_t orig_umask = umask(000);
  57   mode_t newmode;
  58   if (0666 != (newmode = touch_get_mode("foobar", 0666))) {
  59     printf("  error: Wrong file mode %o when creating using mode 666 and umask 000\n",
  60            newmode);
  61   }
  62   umask(007);
  63   if (0660 != (newmode = touch_get_mode("foobar", 0666))) {
  64     printf("  error: Wrong file mode %o when creating using mode 666 and umask 007\n",
  65            newmode);
  66   }
  67
  68   umask (orig_umask);
  69   return 0;
  70 }
  71
  72 int main(int argc, char **argv) {
  73   [...]
  74   test_umask();
  75   return 0;
  76 }
  77 </pre>
  78
  79 <p>Sure enough.  On NFS to a netapp, I get this result:</p>
  80
  81 <pre>
  82 Testing POSIX/Unix sematics on file system
  83 info: testing symlink creation
  84 info: testing subdirectory creation
  85 info: testing fcntl locking
  86   Read-locking 1 byte from 1073741824
  87   Read-locking 510 byte from 1073741826
  88   Unlocking 1 byte from 1073741824
  89   Write-locking 1 byte from 1073741824
  90   Write-locking 510 byte from 1073741826
  91   Unlocking 2 byte from 1073741824
  92 info: testing umask effect on file creation
  93 </pre>
  94
  95 <p>When mounting the same directory using sshfs, I get this
  96 result:</p>
  97
  98 <pre>
  99 Testing POSIX/Unix sematics on file system
 100 info: testing symlink creation
 101 info: testing subdirectory creation
 102 info: testing fcntl locking
 103   Read-locking 1 byte from 1073741824
 104   Read-locking 510 byte from 1073741826
 105   Unlocking 1 byte from 1073741824
 106   Write-locking 1 byte from 1073741824
 107   Write-locking 510 byte from 1073741826
 108   Unlocking 2 byte from 1073741824
 109 info: testing umask effect on file creation
 110   error: Wrong file mode 644 when creating using mode 666 and umask 000
 111   error: Wrong file mode 640 when creating using mode 666 and umask 007
 112 </pre>
 113
 114 <p>So, I can conclude that sshfs is better than smb to a Netapp or a
 115 Windows server, but not good enough to be used as a home
 116 directory.</p>
 117
 118 <p>Update 2010-08-26: Reported the issue in
 119 <a href="http://bugs.debian.org/594498">BTS report #594498</a></p>
 120
 121 <p>Update 2010-08-27: Michael Gebetsroither report that he found the
 122 script so useful that he created a GIT repository and stored it in
 123 <a href="http://github.com/gebi/fs-test">http://github.com/gebi/fs-test</a>.</p>
 124 </div>
 125
 126       <div class="tags">Tags: <a href="http://www.hungry.com/~pere/blog/tags/debian edu">debian edu</a>, <a href="http://www.hungry.com/~pere/blog/tags/english">english</a>, <a href="http://www.hungry.com/~pere/blog/tags/nuug">nuug</a>.</div>
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 426
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 432 <li><a href="http://www.hungry.com/~pere/blog/archive/2013/01/">January (11)</a></li>
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 455
 456 </ul></li>
 457
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 484
 485 </ul></li>
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 507
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 509
 510 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/11/">November (3)</a></li>
 511
 512 <li><a href="http://www.hungry.com/~pere/blog/archive/2011/12/">December (1)</a></li>
 513
 514 </ul></li>
 515
 516 <li>2010
 517 <ul>
 518
 519 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/01/">January (2)</a></li>
 520
 521 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/02/">February (1)</a></li>
 522
 523 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/03/">March (3)</a></li>
 524
 525 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/04/">April (3)</a></li>
 526
 527 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/05/">May (9)</a></li>
 528
 529 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/06/">June (14)</a></li>
 530
 531 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/07/">July (12)</a></li>
 532
 533 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/08/">August (13)</a></li>
 534
 535 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/09/">September (7)</a></li>
 536
 537 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/10/">October (9)</a></li>
 538
 539 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/11/">November (13)</a></li>
 540
 541 <li><a href="http://www.hungry.com/~pere/blog/archive/2010/12/">December (12)</a></li>
 542
 543 </ul></li>
 544
 545 <li>2009
 546 <ul>
 547
 548 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/01/">January (8)</a></li>
 549
 550 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/02/">February (8)</a></li>
 551
 552 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/03/">March (12)</a></li>
 553
 554 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/04/">April (10)</a></li>
 555
 556 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/05/">May (9)</a></li>
 557
 558 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/06/">June (3)</a></li>
 559
 560 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/07/">July (4)</a></li>
 561
 562 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/08/">August (3)</a></li>
 563
 564 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/09/">September (1)</a></li>
 565
 566 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/10/">October (2)</a></li>
 567
 568 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/11/">November (3)</a></li>
 569
 570 <li><a href="http://www.hungry.com/~pere/blog/archive/2009/12/">December (3)</a></li>
 571
 572 </ul></li>
 573
 574 <li>2008
 575 <ul>
 576
 577 <li><a href="http://www.hungry.com/~pere/blog/archive/2008/11/">November (5)</a></li>
 578
 579 <li><a href="http://www.hungry.com/~pere/blog/archive/2008/12/">December (7)</a></li>
 580
 581 </ul></li>
 582
 583 </ul>
 584
 585
 586
 587 <h2>Tags</h2>
 588 <ul>
 589
 590  <li><a href="http://www.hungry.com/~pere/blog/tags/3d-printer">3d-printer (19)</a></li>
 591
 592  <li><a href="http://www.hungry.com/~pere/blog/tags/amiga">amiga (1)</a></li>
 593
 594  <li><a href="http://www.hungry.com/~pere/blog/tags/aros">aros (1)</a></li>
 595
 596  <li><a href="http://www.hungry.com/~pere/blog/tags/bankid">bankid (4)</a></li>
 597
 598  <li><a href="http://www.hungry.com/~pere/blog/tags/betalkontant">betalkontant (9)</a></li>
 599
 600  <li><a href="http://www.hungry.com/~pere/blog/tags/bitcoin">bitcoin (13)</a></li>
 601
 602  <li><a href="http://www.hungry.com/~pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 603
 604  <li><a href="http://www.hungry.com/~pere/blog/tags/bsa">bsa (2)</a></li>
 605
 606  <li><a href="http://www.hungry.com/~pere/blog/tags/chrpath">chrpath (3)</a></li>
 607
 608  <li><a href="http://www.hungry.com/~pere/blog/tags/debian">debian (209)</a></li>
 609
 610  <li><a href="http://www.hungry.com/~pere/blog/tags/debian edu">debian edu (159)</a></li>
 611
 612  <li><a href="http://www.hungry.com/~pere/blog/tags/debian-handbook">debian-handbook (9)</a></li>
 613
 614  <li><a href="http://www.hungry.com/~pere/blog/tags/digistan">digistan (11)</a></li>
 615
 616  <li><a href="http://www.hungry.com/~pere/blog/tags/dld">dld (18)</a></li>
 617
 618  <li><a href="http://www.hungry.com/~pere/blog/tags/docbook">docbook (33)</a></li>
 619
 620  <li><a href="http://www.hungry.com/~pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 621
 622  <li><a href="http://www.hungry.com/~pere/blog/tags/english">english (471)</a></li>
 623
 624  <li><a href="http://www.hungry.com/~pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 625
 626  <li><a href="http://www.hungry.com/~pere/blog/tags/fildeling">fildeling (14)</a></li>
 627
 628  <li><a href="http://www.hungry.com/~pere/blog/tags/freeculture">freeculture (34)</a></li>
 629
 630  <li><a href="http://www.hungry.com/~pere/blog/tags/freedombox">freedombox (9)</a></li>
 631
 632  <li><a href="http://www.hungry.com/~pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 633
 634  <li><a href="http://www.hungry.com/~pere/blog/tags/h264">h264 (20)</a></li>
 635
 636  <li><a href="http://www.hungry.com/~pere/blog/tags/intervju">intervju (43)</a></li>
 637
 638  <li><a href="http://www.hungry.com/~pere/blog/tags/isenkram">isenkram (21)</a></li>
 639
 640  <li><a href="http://www.hungry.com/~pere/blog/tags/kart">kart (23)</a></li>
 641
 642  <li><a href="http://www.hungry.com/~pere/blog/tags/kodi">kodi (6)</a></li>
 643
 644  <li><a href="http://www.hungry.com/~pere/blog/tags/ldap">ldap (9)</a></li>
 645
 646  <li><a href="http://www.hungry.com/~pere/blog/tags/lego">lego (5)</a></li>
 647
 648  <li><a href="http://www.hungry.com/~pere/blog/tags/lenker">lenker (8)</a></li>
 649
 650  <li><a href="http://www.hungry.com/~pere/blog/tags/linuxcnc">linuxcnc (8)</a></li>
 651
 652  <li><a href="http://www.hungry.com/~pere/blog/tags/lsdvd">lsdvd (3)</a></li>
 653
 654  <li><a href="http://www.hungry.com/~pere/blog/tags/ltsp">ltsp (1)</a></li>
 655
 656  <li><a href="http://www.hungry.com/~pere/blog/tags/madewithcc">madewithcc (3)</a></li>
 657
 658  <li><a href="http://www.hungry.com/~pere/blog/tags/mesh network">mesh network (8)</a></li>
 659
 660  <li><a href="http://www.hungry.com/~pere/blog/tags/multimedia">multimedia (48)</a></li>
 661
 662  <li><a href="http://www.hungry.com/~pere/blog/tags/nice free software">nice free software (15)</a></li>
 663
 664  <li><a href="http://www.hungry.com/~pere/blog/tags/noark5">noark5 (27)</a></li>
 665
 666  <li><a href="http://www.hungry.com/~pere/blog/tags/norsk">norsk (326)</a></li>
 667
 668  <li><a href="http://www.hungry.com/~pere/blog/tags/nuug">nuug (200)</a></li>
 669
 670  <li><a href="http://www.hungry.com/~pere/blog/tags/offentlig innsyn">offentlig innsyn (42)</a></li>
 671
 672  <li><a href="http://www.hungry.com/~pere/blog/tags/open311">open311 (2)</a></li>
 673
 674  <li><a href="http://www.hungry.com/~pere/blog/tags/opensnitch">opensnitch (4)</a></li>
 675
 676  <li><a href="http://www.hungry.com/~pere/blog/tags/opphavsrett">opphavsrett (76)</a></li>
 677
 678  <li><a href="http://www.hungry.com/~pere/blog/tags/personvern">personvern (114)</a></li>
 679
 680  <li><a href="http://www.hungry.com/~pere/blog/tags/raid">raid (4)</a></li>
 681
 682  <li><a href="http://www.hungry.com/~pere/blog/tags/reactos">reactos (1)</a></li>
 683
 684  <li><a href="http://www.hungry.com/~pere/blog/tags/reprap">reprap (11)</a></li>
 685
 686  <li><a href="http://www.hungry.com/~pere/blog/tags/rfid">rfid (3)</a></li>
 687
 688  <li><a href="http://www.hungry.com/~pere/blog/tags/robot">robot (17)</a></li>
 689
 690  <li><a href="http://www.hungry.com/~pere/blog/tags/rss">rss (1)</a></li>
 691
 692  <li><a href="http://www.hungry.com/~pere/blog/tags/ruter">ruter (7)</a></li>
 693
 694  <li><a href="http://www.hungry.com/~pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 695
 696  <li><a href="http://www.hungry.com/~pere/blog/tags/sikkerhet">sikkerhet (60)</a></li>
 697
 698  <li><a href="http://www.hungry.com/~pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 699
 700  <li><a href="http://www.hungry.com/~pere/blog/tags/skepsis">skepsis (5)</a></li>
 701
 702  <li><a href="http://www.hungry.com/~pere/blog/tags/standard">standard (80)</a></li>
 703
 704  <li><a href="http://www.hungry.com/~pere/blog/tags/stavekontroll">stavekontroll (7)</a></li>
 705
 706  <li><a href="http://www.hungry.com/~pere/blog/tags/stortinget">stortinget (14)</a></li>
 707
 708  <li><a href="http://www.hungry.com/~pere/blog/tags/surveillance">surveillance (65)</a></li>
 709
 710  <li><a href="http://www.hungry.com/~pere/blog/tags/sysadmin">sysadmin (6)</a></li>
 711
 712  <li><a href="http://www.hungry.com/~pere/blog/tags/usenix">usenix (2)</a></li>
 713
 714  <li><a href="http://www.hungry.com/~pere/blog/tags/valg">valg (9)</a></li>
 715
 716  <li><a href="http://www.hungry.com/~pere/blog/tags/verkidetfri">verkidetfri (23)</a></li>
 717
 718  <li><a href="http://www.hungry.com/~pere/blog/tags/video">video (82)</a></li>
 719
 720  <li><a href="http://www.hungry.com/~pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 721
 722  <li><a href="http://www.hungry.com/~pere/blog/tags/web">web (42)</a></li>
 723
 724 </ul>
 725
 726
 727     </div>
 728     <p style="text-align: right">
 729  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 730 </p>
 731
 732   </body>
 733 </html>