[cups] Why a backend owned by root can't create file in /var/log/cups/ (Permission Denied)

[Sean Greenslade]

On December 23, 2015 3:30:58 AM EST, caiweiwenjs <caiweiwenjs at 163.com> wrote:
>Dear all,
>I install cups-pdf(come from http://www.cups-pdf.de/ ) in my computer,
>but it don't work.
>I find the reason by printing debug information in a file.
>The reason is permission denied: cups-pdf create log file in
>/var/log/cups/ and create directory in /var/spool/
>This is my backend:
>    cww at ubuntu:/usr/lib/cups/backend$ ll cups-pdf 
>    -rwx------ 1 root root 138352 Dec 23 15:19 cups-pdf*
>I modify source code cups-pdf.c which printing the result of getuid()
>and geteuid() in the begin of main(), the result both are 0.
>
>
>Platform: Ubuntu 15.10 64bit
>CUPS Version: CUPS 2.1.0
>CUPS-PDF version: CUPS-PDF 3.0beta2
>
>
>Thank you very much!
>Sorry for my poor English.
>
>
>Weiwen Cai
>_______________________________________________
>cups mailing list
>cups at cups.org
>https://www.cups.org/mailman/listinfo/cups

Sounds like SELinux / AppArmor / something like that.

--Sean