packages/commands promise cannot install MySQL packages from mysql.com / SIGPIPE handling

During installation of MySQL-server package (5.6.12) from http://dev.mysql.com/downloads/mysql/ cfagent hangs with following ps output:

<pre>
(1) root 12475 12318 0 14:12 pts/0 00:00:01 /usr/bin/zypper --non-interactive install --from sles11-repo-sp2 MySQL-server
(2) root 12480 12475 3 14:12 pts/0 00:00:06 rpm --root / --dbpath /var/lib/rpm -U --percent --force --nodeps – /var/cache/zypp/packages/sles11-repo-sp2/rpm/MySQL-server-5.6.12-1.sles11.x86_64.rpm
(3) root 12496 12480 0 14:12 pts/0 00:00:00 /bin/sh /var/tmp/rpm-tmp.81086 1
(4) root 12512 12496 0 14:12 pts/0 00:00:00 /usr/bin/perl /usr/bin/mysql_install_db --rpm --user=mysql --random-passwords
(5) root 12515 12512 0 14:12 pts/0 00:00:00 sh -c cat /dev/urandom | LC_ALL=C tr -dc "[:alnum:]" | fold -w 8 | head -1
(6) root 12516 12515 95 14:12 pts/0 00:02:34 cat /dev/urandom
(7) root 12517 12515 3 14:12 pts/0 00:00:04 tr -dc [:alnum:]
(8) root 12518 12515 1 14:12 pts/0 00:00:01 fold -w 8
</pre>

Reason for hanging is the 'mysql_install_db' (4) command that executes a shell to generate a random 8 character password using in (5). You can see that "head -1" already finished (after the first 8 bytes) here. "cat /dev/urandom" with 95% cpu is still copying bytes from /dev/urandom to STDOUT, through "tr" into the "fold" command.

From strace you can see that the fold command received numerous SIGPIPEs that seem to get ignored (-> the process does not die).

Same can be seen when invoking "mysql_install_db" from commands promise.

bug.cf:

<pre>
body common control { bundlesequence =>

{ "main" }

; }
bundle agent main {
commands:
"/tmp/t.pl";
}
</pre>

t.pl (stripped down version of "mysql_install_db"):

<pre>
#!/usr/bin/perl
my $password = `cat /dev/urandom | LC_ALL=C tr -dc "[:alnum:]" | fold -w 8 | head -1`;
print "P: $password";
</pre>