Uploaded to trusty-proposed for hand-off to ubuntu-sru.
** Description changed:
[Impact]
* daily cron job may fail with a bash "unbound variable" error
* the fix is small, low risk and easy to understand
* the fix is from Debian and included in vivid and simply initializes the
affected variables. See the Original description (below) for details
[Test Case]
* the test case for NF_ADD requires: an aide setup with up to date database,
downgrade/upgrade a package, then run the aide con job. Specifically:
1. $ sudo apt-get install aide
2. Update /etc/default/aide to have:
COPYNEWDB=yes
FILTERUPDATES=yes
3. $ sudo aideinit # takes a long time
4. $ sudo dpkg -i /path/to/some/different/version/of/installed/deb
- 5. $ sudo /etc/cron.daily/aide # takes a long time
+ 5. $ sudo /etc/cron.daily/aide
+
+ '5' also takes a while, but will eventually fail with:
+ /etc/cron.daily/aide: line 413: NF_ADD: unbound variable
+
[Regression Potential]
* Regression potential is very low. It is a simple change to the
/etc/cron.daily/aide shell script which only initializes a few variables that
weren't initialized yet
Attached is a debdiff to fix this issue.
Original description:
Ubuntu version: 14.04 LTS (server)
AIDE version: 0.16~a2.git20130520-2
EXPECTED RESULT
===============
The daily cron job should excute properly, generating an email with the AIDE
report for that day.
ACTUALLY RESULT
==============
The daily cron job fails with a bash "unbound variable" error.
DESCRIPTION
===============
I recently upgraded a machine from Ubuntu Server 12.04 LTS to Ubuntu Server
14.04 LTS. After the upgrade I noticed that the AIDE cronjob was failing with
this error:
-----
/etc/cron.daily/aide:
/etc/cron.daily/aide: line 413: NF_ADD: unbound variable
run-parts: /etc/cron.daily/aide exited with return code 1
-----
NF_ADD is explicity defined as an array, but on line 413 it would appear
that a new element is trying to be added to the array based on the
current count of the array:
NF_ADD[${#NF_ADD[*]}]="$line"
However, if the variable/array is empty, then referencing ${#NF_ADD[*]}
produces an "unbound variable" error, and since line #3 of the script
sets the -e option, bash will terminate executeion of the script upon
encountering this error, meaning the AIDE cron.daily script fails to
complete.
The attached patch seems to have fixed the issue for me, though I really
don't know if that is the correct fix, or if it might have other
unintended consequences when run with different options or in a
different environment.
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https://bugs.launchpad.net/bugs/1323827
Title:
aide cronjob fails with bash unbound variable error
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