Diff for "VirtualExam"

Differences between revisions 6 and 16 (spanning 10 versions)

Virtual Exam

Work in Progress or Draft only

Please read the documentation of virtual exam

$/!\$ 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
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 <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.
~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
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 '^$' | egrep -v '(/lib|/bin$|/usr($|/bin$|/(lib|share)))' | sort | uniq | less

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.

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
```

-  ⇤ ← Revision 6 as of 2019-02-13 07:20:18 → 
  Size: 1630
  Editor: MeichengWhale
  Comment:
+   ← Revision 16 as of 2019-02-13 14:39:30 → ⇥
  Size: 2507
  Editor: MeichengWhale
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
+=== Work in Progress or Draft only ===
-Line 7:
+Line 9:
- * ~give/stable/bin/prac_install_vx <prac_name>
+ * ~give/stable/bin/prac_install_vx <from_prac> <to_prac>
-Line 9:
+Line 11:
+   . 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)
-Line 11:
+Line 22:
- . change work directories ownership from 90<uid> to the exam account
 . needed for access to students files
 . after changing ownership, exam will not work, so do this only after the exam is finished.
+   . 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.
-Line 19:
+Line 29:
- . script will output the files that are missing from the config files
+   . script will output files that are missing from the config files
-Line 22:
+Line 32:
+ . 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 '^$' | egrep -v '(/lib|/bin$|/usr($|/bin$|/(lib|share)))' | sort | uniq | less
 }}}
-Line 34:
+Line 48:
- * after changing ownership of the work directories to the exam account, you can't start up the exam with the same work directories. create a new work directory.
 {{{
+ * 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.
   {{{
-Line 40:
+Line 55:
- }}}
+   }}}
   * or remove the student's work directory
   {{{
cd ~/exams/18s2supp/work
priv chown z5555555
rm -r z5555555
   }}}