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/!\ The way the virtual exam white listed software (etc/vx.conf) will be rewritten early in Term 1 to better cope with software changes on CSE computers. === Useful scripts ===
 * '''~give/stable/bin/prac_install_vx [from_prac] to_prac'''
   set up a standard virtual exam environment
   . if from_prac != to_prac
      . copy from_prac from virtual directory if exists
      . copy from_prac from gaol directory otherwise
   . else
      . copy from_prac from gaol directory
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=== Useful scripts ===
 * ~give/stable/bin/prac_install_vx <from_prac> <to_prac>
   set up a standard virtual exam environment
   . if <from_prac> != <to_prac>
      . copy <from_prac> from virtual directory if exists
      . copy <from_prac> from gaol directory otherwise
   . else
      . copy <from_prac> from gaol directory

 * priv passwd		  * '''priv passwd'''
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 * priv chown <path_wildcard>
   . change work directory ownership from 90<uid> to the exam account to access students' files
   . after changing ownership, students can't start the exam. so, do this only after the exam has finished.		  * '''priv chown wildcard'''
   . change ownership of work directories from 90<uid> to exam account
   . after changing ownership, students can't start the exam. run the command after the exam has finished.
   {{{
marimba % ls -la exams/19T1midterm/work
total 16
drwxrwxrwt 4 en1811exam en1811exam 4096 Mar 14 21:19 .
drwxr-x--- 6 en1811exam en1811exam 4096 Mar 12 17:50 ..
drwxrws--- 14 929389 en1811exam 4096 Mar 14 21:36 z5016573
drwxrws--- 13 906444 en1811exam 4096 Mar 12 20:02 z8470184
   }}}
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 * ~give/stable/bin/vx-conf-product.pl
   * strace the command
   * feed the output of strace to this script
   * add vx.conf files as arguments
   . script will output files that are missing from the config files		  * '''/home/vxconf/vx.conf.d''' is the repository for vx.conf files for commonly used products e.g. gcc, python, gedit, fluxbox
   prac-install-vx creates ~/exams/prac/etc/vx.conf.d and fill it with symbolic links to vx.conf files in /home/vxconf/vx.conf.d
   {{{
-rw-r--r-- 1 vxconf vxconf 433 Mar 14 21:31 000-header.conf
-rw-r--r-- 1 vxconf vxconf 220 Mar 14 21:31 100-basicx.conf
-rw-r--r-- 1 vxconf vxconf 159 Mar 14 21:31 100-fontconfig.conf
-rw-r--r-- 1 vxconf vxconf 99 Mar 14 21:31 100-rxvt.conf
-rw-r--r-- 1 vxconf vxconf 202 Mar 14 21:31 200-wm-fluxbox.conf
-rw-r--r-- 1 vxconf vxconf 351 Mar 14 21:31 200-wm-fvwm.conf
-rw-r--r-- 1 vxconf vxconf 608 Mar 14 21:31 300-interp-perl.conf
-rw-r--r-- 1 vxconf vxconf 210 Mar 14 21:31 300-interp-pylint.conf
-rw-r--r-- 1 vxconf vxconf 1894 Mar 14 21:31 300-interp-python.conf
-rw-r--r-- 1 vxconf vxconf 860 Mar 14 21:31 300-toolchain-binutils.conf
-rw-r--r-- 1 vxconf vxconf 3374 Mar 14 21:31 300-toolchain-clang.conf
-rw-r--r-- 1 vxconf vxconf 1690 Mar 14 21:31 300-toolchain-gcc.conf
-rw-r--r-- 1 vxconf vxconf 105 Mar 14 21:31 300-toolchain-gdb.conf
-rw-r--r-- 1 vxconf vxconf 79 Mar 14 21:31 300-toolchain-make.conf
-rw-r--r-- 1 vxconf vxconf 212 Mar 14 21:31 300-toolchain-valgrind.conf
-rw-r--r-- 1 vxconf vxconf 84 Mar 14 21:31 400-browser-firefox.conf
-rw-r--r-- 1 vxconf vxconf 54 Mar 14 21:31 400-browser-midori.conf
-rw-r--r-- 1 vxconf vxconf 369 Mar 14 21:31 400-browser-nautilus.conf
-rw-r--r-- 1 vxconf vxconf 84 Mar 14 21:31 400-viewer-evince.conf
-rw-r--r-- 1 vxconf vxconf 110 Mar 14 21:31 400-viewer-xpdf.conf
-rw-r--r-- 1 vxconf vxconf 328 Mar 14 21:31 500-editor-emacs.conf
-rw-r--r-- 1 vxconf vxconf 300 Mar 14 21:31 500-editor-gedit.conf
-rw-r--r-- 1 vxconf vxconf 52 Mar 14 21:31 500-editor-idle.conf
-rw-r--r-- 1 vxconf vxconf 47 Mar 14 21:31 500-editor-nedit.conf
-rw-r--r-- 1 vxconf vxconf 96 Mar 14 21:31 500-editor-spyder3.conf
-rw-r--r-- 1 vxconf vxconf 26 Mar 14 21:31 500-editor-vi.conf
-rw-r--r-- 1 vxconf vxconf 161 Mar 14 21:31 500-editor-vim.conf
   }}}
   ~- thanks to Jashank for the original idea -~
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 * dpkg-query, apt-cache depends
 . find files needed by gcc
 {{{
apt-cache depends --recurse --no-pre-depends --no-recommends --no-suggests --no-conflicts --no-breaks --no-replaces --no-enhances gcc | egrep -v '^ ' | xargs dpkg --listfiles | egrep -v '^($|/lib|/bin$|/usr($|/bin$|/(lib|share)))'| sort | uniq | less
 }}}
 ~- thanks Jashank! -~
=== Tips ===
 * when the exam crashes after you authenticated with your zid, check the stderr.log file under <exam_account>/var directory. Look at the latest directories.
=== Problems - Tips on how to solve ===
 * when the exam crashes after you authenticated with your zid, check stderr.log file under <exam_account>/var directory. Look at the latest directories.

Virtual Exam

Work in Progress or Draft only

Please read the documentation of virtual exam

Useful scripts

  • ~give/stable/bin/prac_install_vx [from_prac] to_prac

    • set up a standard virtual exam environment
    • if from_prac != to_prac
      • copy from_prac from virtual directory if exists
      • copy from_prac from gaol directory otherwise
    • else
      • copy from_prac from gaol directory

  • priv passwd

    • change the vxN (eg vx6) password before and after the exam with this script
    • add the class account public key to the exam account (eg cs2521exam)

  • priv chown wildcard

    • change ownership of work directories from 90<uid> to exam account

    • after changing ownership, students can't start the exam. run the command after the exam has finished. 
      marimba % ls -la exams/19T1midterm/work
total 16
drwxrwxrwt  4 en1811exam en1811exam 4096 Mar 14 21:19 .
drwxr-x---  6 en1811exam en1811exam 4096 Mar 12 17:50 ..
drwxrws--- 14     929389 en1811exam 4096 Mar 14 21:36 z5016573
drwxrws--- 13     906444 en1811exam 4096 Mar 12 20:02 z8470184

  • /home/vxconf/vx.conf.d is the repository for vx.conf files for commonly used products e.g. gcc, python, gedit, fluxbox

    • prac-install-vx creates ~/exams/prac/etc/vx.conf.d and fill it with symbolic links to vx.conf files in /home/vxconf/vx.conf.d 
      -rw-r--r-- 1 vxconf vxconf  433 Mar 14 21:31 000-header.conf
-rw-r--r-- 1 vxconf vxconf  220 Mar 14 21:31 100-basicx.conf
-rw-r--r-- 1 vxconf vxconf  159 Mar 14 21:31 100-fontconfig.conf
-rw-r--r-- 1 vxconf vxconf   99 Mar 14 21:31 100-rxvt.conf
-rw-r--r-- 1 vxconf vxconf  202 Mar 14 21:31 200-wm-fluxbox.conf
-rw-r--r-- 1 vxconf vxconf  351 Mar 14 21:31 200-wm-fvwm.conf
-rw-r--r-- 1 vxconf vxconf  608 Mar 14 21:31 300-interp-perl.conf
-rw-r--r-- 1 vxconf vxconf  210 Mar 14 21:31 300-interp-pylint.conf
-rw-r--r-- 1 vxconf vxconf 1894 Mar 14 21:31 300-interp-python.conf
-rw-r--r-- 1 vxconf vxconf  860 Mar 14 21:31 300-toolchain-binutils.conf
-rw-r--r-- 1 vxconf vxconf 3374 Mar 14 21:31 300-toolchain-clang.conf
-rw-r--r-- 1 vxconf vxconf 1690 Mar 14 21:31 300-toolchain-gcc.conf
-rw-r--r-- 1 vxconf vxconf  105 Mar 14 21:31 300-toolchain-gdb.conf
-rw-r--r-- 1 vxconf vxconf   79 Mar 14 21:31 300-toolchain-make.conf
-rw-r--r-- 1 vxconf vxconf  212 Mar 14 21:31 300-toolchain-valgrind.conf
-rw-r--r-- 1 vxconf vxconf   84 Mar 14 21:31 400-browser-firefox.conf
-rw-r--r-- 1 vxconf vxconf   54 Mar 14 21:31 400-browser-midori.conf
-rw-r--r-- 1 vxconf vxconf  369 Mar 14 21:31 400-browser-nautilus.conf
-rw-r--r-- 1 vxconf vxconf   84 Mar 14 21:31 400-viewer-evince.conf
-rw-r--r-- 1 vxconf vxconf  110 Mar 14 21:31 400-viewer-xpdf.conf
-rw-r--r-- 1 vxconf vxconf  328 Mar 14 21:31 500-editor-emacs.conf
-rw-r--r-- 1 vxconf vxconf  300 Mar 14 21:31 500-editor-gedit.conf
-rw-r--r-- 1 vxconf vxconf   52 Mar 14 21:31 500-editor-idle.conf
-rw-r--r-- 1 vxconf vxconf   47 Mar 14 21:31 500-editor-nedit.conf
-rw-r--r-- 1 vxconf vxconf   96 Mar 14 21:31 500-editor-spyder3.conf
-rw-r--r-- 1 vxconf vxconf   26 Mar 14 21:31 500-editor-vi.conf
-rw-r--r-- 1 vxconf vxconf  161 Mar 14 21:31 500-editor-vim.conf

      thanks to Jashank for the original idea

Problems - Tips on how to solve

  • when the exam crashes after you authenticated with your zid, check stderr.log file under <exam_account>/var directory. Look at the latest directories. 

    marimba % ls -lt ~/var | head -5
total 988
drwxr-xr-x 2 cs9024exam cs9024exam 4096 Feb 13 06:59 marimba-25528
drwxr-xr-x 2 cs9024exam cs9024exam 4096 Feb 12 20:49 wagner-7800
drwxr-xr-x 2 cs9024exam cs9024exam 4096 Feb 12 20:33 vx4-45795
drwxr-xr-x 2 cs9024exam cs9024exam 4096 Feb 12 18:39 vx4-34624
  • after changing ownership of the work directories (to exam account), you can't start the exam with the same work directories.
    • create a new toplevel work directory. 
      cd ~/exams/18s2supp
mv work work.19dec
mkdir work
chmod 1777 work
    • or remove the student's work directory 
      cd ~/exams/18s2supp/work
priv chown z5555555
rm -r z5555555

VirtualExam (last edited 2022-10-25 16:12:21 by MeiChengWhale)