Diff for "VirtualExam"

Differences between revisions 13 and 19 (spanning 6 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 '^($|/lib|/bin$|/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.

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 13 as of 2019-02-13 11:32:31 → 
  Size: 1857
  Editor: MeichengWhale
  Comment:
+   ← Revision 19 as of 2019-02-26 14:34:49 → ⇥
  Size: 2532
  Editor: MeichengWhale
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
+#acl All:read
-Line 9:
+Line 11:
- * ~give/stable/bin/prac_install_vx <prac_name>
+ * ~give/stable/bin/prac_install_vx <from_prac> <to_prac>
-Line 11:
+Line 13:
+   . 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
-Line 17:
+Line 24:
-   . change work directory ownership from 90<uid> to the exam account
   . for access to students' files
+   . change work directory ownership from 90<uid> to the exam account to access students' files
-Line 25:
+Line 31:
-   . script will output the files that are missing from the config files
+   . script will output files that are missing from the config files
-Line 28:
+Line 34:
+ . 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! -~
-Line 41:
+Line 50:
- * after changing ownership of the work directories (to exam account), you can't start 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 47:
+Line 57:
- }}}
+   }}}
   * or remove the student's work directory
   {{{
cd ~/exams/18s2supp/work
priv chown z5555555
rm -r z5555555
   }}}